MT9072

Zarlink Semiconductor I...

The MT9072 is a multi-port T1/E1/J1 framing device that integrates eight fully independent, feature rich framers. The device is software selectable between T1, E1 or J1 modes and meets the…

Manufacturer: Zarlink Semiconductor I...

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MT9072 ZARLINK | Alldatasheet

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Technical content

Features

Eight fully independent, T1/E1/J1 framers
3.3 V supply with 5 V tolerant inputs
Selectable 2.048 Mbit/s or 8.192 Mbit/s serial buses for both data and signaling
Framing Modes: - T1: D4, ESF, T1DM - E1: Basic Framing, CRC4 multiframing and Signaling Multiframing
Supports Inverse Mux for ATM
Timeslot assignable HDLC
IEEE-1149.1 (JTAG) test port

Applications

T1/E1/J1 add/drop multiplexers
V5.1 and V5.2 access network interfaces
CO and PBX equipment interfaces
Primary rate IDSN nodes
Digital Cross-connect Systems (DCS)
Wireless base stations

Description

The MT9072 is a multi-port T1/E1/J1 framing device that integrates eight fu lly independent, feature rich framers. The device is software selectable between T1, E1 or J1 modes and meets the latest relevant recommendations and standards from Telcordia, ANSI, ETSI and ITU-T. An extensive suite of features make the MT9072 very flexible and suitable for a wide variety of applications around the globe. October 2004

Ordering Information

-40°C to +85 °C MT9072 Octal T1/E1/J1 Framer Data Sheet Figure 1 - Block Diagram Microprocessor Interface RW CSDS IRQD15~D0 A11~A0 IM ST-BUS Interface CAS Buffer ST-BUS Payload National Alarm Detection, 2 Frame Slip Buffer ST-BUS Interface TPOS[0] RPOS[0] CSTi [0] DSTi [0] CSTo[0] DSTo[0] EXCLi[0] RNEG[0] TNEG[0] Bit Buffer CKi[0] RxMF[0] TxCL [0] Transmit Framing, Error and Test Signal Generation Data Link Receive Framing, Performance Monitoring, RxDLC[0] TxDLC[0] RxBF[0]RxDL[0] TxDL[0] FPi[0] ST-BUS Circuit Timing RESET VDD VSS FRAMER 0 FRAMER 1 Common Control and Power TAISTDI TDO TMS TCK TRST IEEE 1149.1 TAP T1-3 Remote TxMF FRAMER 2 FRAMER 3 FRAMER 4 FRAMER 5 FRAMER 6 FRAMER 7 Loopback Loopback Loopback Digital Loopback

Zarlink Semiconductor Inc. MT9072 Detailed Feature Summary Standards Compliance and Support Access and Control

A 16-bit parallel Motorola or Inte l non-multiplexed microprocessor interface is used to access the control and status registers Backplane Interfaces
2.048 Mbit/s or 8.192 Mbit/s ST-BUS
2.048 Mbit/s GCI bus
IMA (Inverse Mux for ATM) mode, 1.544 Mbit/s (T1) or 2.048 Mbit/s (E1) serial bus with asynchronous transmit and receive timing for Inverse MUX for ATM applications.
CSTo/CSTi pins can be used to access the receive/transmit signaling data
RxDL pin can be used to access the entire B8ZS/H DB3 decoded receive stream including framing bits
TxDL pin can be used to transmit data on the FDL (T1) or the Sa bits (E1) T1/J1 Mode E1 Mode ANSI: T1.102, T1.231 T1.403, T1.408 AT&T: TR 62411, PUB43801 Telcordia: GR-303-CORE ITU-T: G.802 TTC: JT-G703, JT-G704 JT-G706 ETSI: TBR4, TBR13 ETS 300 233, ETS 300 347 (V5.2) ITU-T: G.965 (V5.2) T1/J1 Mode E1 Mode
PCM24 channels 1-24 are mapped to ST-BUS channels 0-23 respectively
PCM30 timeslots 0-31 are mapped to ST-BUS channels 0-31 respectively
The framing-bit is mapped to ST-BUS channel

Zarlink Semiconductor Inc. Data Link One Embedded Floating HDLC per Framer

Flag generation and Frame Check Sequence (FCS) gener ation and detection, zero insertion and deletion
Continuous flags, or continuous 1s are transmitted between frames
Transmit frame-abort
Invalid frame handling:
Frames yielding an incorrect FCS are tagged as bad packets
Frames with fewer than 25 bits are ignored
Frames with fewer than 32 bits between flags are tagged as bad packets
Frames interrupted by a Frame-Abort sequence remain in the FIFO and an interrupt is generated
Access is provided to the receive FCS
FCS generation can be inhibited for terminal adaptation
Recognizes single byte, dual byte and all call addresses
Independent, 32 byte deep transmit and receive FIFOs
Receive FIFO maskable interrupts for nearly full and overflow conditions
Transmit FIFO maskable interrupts for nearly empty and underflow conditions
Maskable interrupts for transmit end-of–packet and receive end-of-packet
Maskable interrupts for receive bad-frame (includes frame abort)
Transmit-to-receive and receive-to-transmit loopbacks are provided
Transmit and receive bit rates and enables are independent
Frame aborts can be sent under software control and t hey are automatically transmitted in the event of a transmit FIFO underrun T1/J1 Mode E1 Mode
Three methods are provided to access the datalink: 1. TxDL and RxDL pins support transmit and receive datalinks 2. Bit Oriented Messages are supported via internal registers 3. An internal HDLC can be assigned to transmit/receive over the FDL in ESF mode
Two methods are provided to access the datalink: 1. TxDL and RxDL pins support transmit and receive datalinks over the Sa4~Sa8 bits 2. An internal HDLC can be assigned to transmit/receive data via the Sa4~Sa8 bits
In transparent mode, if the Sa4 bit is used for an intermediate datalink, the CRC-4 remainder can be updated to reflect changes to the Sa4 bit T1/J1 Mode E1 Mode
Assignable to the ESF Facility Data Link or any other channel
Assignable to timeslot-0, bits Sa4~Sa8 or any other timeslot

Zarlink Semiconductor Inc. Common Channel Signaling Timeslot Assigner

Selected 64 Kbit/s CCS channels (for V5.2 and GR- 303) can be routed to/from an external multichannel HDLC, using the CSTi/0 pins Access and Monitoring for National (Sa) Bits (E1 mode only)
In addition to the datalink functions, the Sa bits can be accessed using:
Single byte register
Five byte transmit and receive national bit buffers
A maskable interrupt is generated on the change of state of any Sa bit Slip Buffers
Operates at 4 kbit/s (FDL), 56 kbit/s or 64 kbit/s
Operates at 4, 8, 12, 16 or 20 kbit/s (Sa bits) or 64 kbit/s T1/J1 Mode E1 Mode Transmit Slip Buffer
Two-frame slip buffer capable of performing a controlled slip. Intended for rate conversion in the transmit direction Receive Slip Buffer
Two-frame slip buffer capable of performing a controlled slip
Wander tolerance of 208 UI peak-to-peak
Programmable delay • Indication of slip
Transmit slips are independent of receive slips • Indication of slip direction
Indication of slip
Indication of slip direction Receive Slip Buffer
Two-frame slip buffer capable of performing a controlled slip
Wander tolerance of 142 UI (92 µs) peak
Indication of slip
Indication of slip direction T1/J1 Mode E1 Mode

Zarlink Semiconductor Inc. Interface to the Physical Layer Device

Single rail NRZ
Dual rail (AMI) RZ or NRZ
Transmits/samples data on the rising or falling edge of the line clock T1/J1 Mode E1 Mode
Optional B8ZS line coding
Pulse density enforcement
Forced ones stuffing (bit 7 of a DS0)
GTE zero suppression code
Bell zero suppression code
DDS zero suppression code
Optional HDB3 line coding

Zarlink Semiconductor Inc. Framing Algorithm T1/J1 Mode E1 Mode

Synchronizes with D4 or ESF protocols
Supports T1DM synchronization with the D4 pattern and timeslot 24 T1DM Sychronization bytes
Framing circuit is off-line
Transparent transmit and receive mode
In D4 mode Fs bits can be optionally cross checked with the Ft bits
The start of the ESF multiframe can be determined by the following methods:
F r e e - r u n
Software reset
Synchronized to the incoming multiframe
An automatic reframe is initiated if the framing bit error density exceeds the programmed threshold
In transparent mode no reframing is forced by the device
Software can force a reframe at any time
In ESF mode the CRC-6 bits can be optionally confirmed before forcing a new frame alignment
During a reframe the signaling bits are frozen, and error counting for Ft, Fs, ESF framing pattern and CRC-6 bits is suspended
If J1 CRC-6 is selected the Fs bits are included in the CRC-6 calculation
J1-CRC-6 and J1-Yellow Alarm can be independently selected
Supports Robbed Bit Signaling
Optional forced ones insertion
Three distinct and independent E1 framing algorithms 1. Basic frame alignment 2. Signaling multiframe alignment 3. CRC-4 multiframe alignment
Transparent receive mode
Transparent transmit mode
Optional automatic interworking between interfaces with and without CRC-4 processing capabilities is supported
An automatic reframe is forced if 3 consecutive frame alignment patterns or three consecutive non-frame alignment bits are received in error
In receive transparent mode no reframing is forced by the device
Software can force a reframe at any time
Software can force a multiframe reframe at any time
E-bits can optionally be set to zero or one until CRC synchronization is achieved
Optional automatic RAI
Supports CAS multiframing
Optional automatic Y-bit to indicate CAS multiframe alignment

Zarlink Semiconductor Inc. Channel Associated Signaling

ABCD or AB bits can be automatically inserted and extracted
Transmit ABCD or AB bits can be passed via the microport or via the CSTi pin
Receive ABCD or AB bits are accessible via the microport or via the CSTo pin
Unused nibble positions in the CSTi/CSTo bandwidth are tri-stated
An interrupt is provided in the event of changes in any of the signaling bits
Receive signaling bits are frozen if digital loss of signal or loss of multiframe alignment is declared T1/J1 Mode E1 Mode
Signaling bits can be debounced by 6 ms
Robbed bit or clear channel signaling are selected on a channel by channel basis
Signaling interrupts period can be selected: 1, 4 or 8 msec
Signaling bits can be debounced by 14 ms
Signaling interupt period can be selected 1, 4 or 8 msec

Zarlink Semiconductor Inc. Alarms T1/J1 Mode E1 Mode Yellow Alarm D4 mode, two types: 1. Bit position 2 is zero for virtually every DS0 over 48ms 2. Two consecutive ones in the S-bit position of the twelfth frame ESF mode, two types: 3. Reception of 0000000011111111 in eight or more codewords out of ten (T1) 4. Reception of 1111111111111111 in eight or more codewords out of ten (J1) T1DM mode : Bit 2 of the T1DM synchronization byte is 0 Alarm Indication Signal (AIS)

Declared if fewer than six zeros are detected during a 3 ms interval Loss Of Signal (LOS )
Loss Of Signal is declared if 192 or 32 consecutive zeros are received Remote Alarm Indication (RAI)
Bit 3 of the receive NFAS Alarm Indication Signal (AIS )
Unframed all ones signal for at least a double frame or two double frames Timeslot 16 Alarm Indication Signal
All ones signal in timeslot 16 Loss Of Signal (LOS)
Loss Of Signal is declared if 192 or 32 consecutive zeros are received Remote Signaling Multiframe Alarm
Y-bit of the multiframe alignment signal

Zarlink Semiconductor Inc. Performance Monitoring Error Counters

All counters can be cleared or preset by writing to the appropriate locations
Maskable occurrence interrupt
Maskable overflow interrupt
Counters can be latched on one second intervals Error Insertion T1/J1 Mode E1 Mode
CRC-6 Multiframe Counter (8-bit)
PRBS Error Counter (8-bit)
Multiframes Out of Sync Counter (16-bit)
Framing Bit Error Counter (16-bit)
Bipolar Violation Counter (16-bit)
CRC-6 Error Counter (16-bit)
Out of Frame Alignment Counter (8-bit)
Change of Frame Alignment Counter (8-bit)
Excessive Zeros Counter (8-bit)
CRC-4 Multiframe Counter (8-bit)
PRBS Error Counter (8-bit)
Loss of Basic Frame Sync (16-bit)
E-bit Error Counter (16-bit)
Bipolar Violation Counter (16-bit)
CRC-4 Error Counter (16-bit)
FAS Bit Error Counter (8-bit)
FAS Error Counter (8-bit) T1/J1 Mode E1 Mode
Bipolar Violations
CRC-6 errors
Ft errors
Fs errors
Payload errors
Loss of Signal error
E - b i t
Bipolar Violations
CRC-4 Errors
FAS Errors
NFAS Errors
Payload Errors
Loss of Signal Error

Zarlink Semiconductor Inc. Loopbacks

Digital loopback
Remote loopback
ST-BUS loopback
Payload loopback
Local timeslot loopback
Remote timeslot loopback
Framer to framer loopback Per Timeslot Control The following features can be controlled on a per timeslot basis:
Clear Channel Capability (only used in T1/J1)
Choice of sourcing transmit signaling bits from microport or CSTi pin
Remote timeslot loopback
Local timeslot loopback
PRBS insertion and reception
Digital milliwatt pattern insertion
Per channel inversion for transmit and receive
Transmit and receive idle code

Zarlink Semiconductor Inc.

Zarlink Semiconductor Inc. Table 156 - Non-Frame Alignment (NFAS) Signal and Frame Alignment Signal (FAS) Status Table 163 - Frame Alignment Signal (FAS) Bit Error Counter & FAS Error Counter (R/W Address Y1A) (E1) . . 190 Table 169 - Sync, CRC-4 Remote, Alarms, MAS and Phase Latched Status Register (Address Y24) (E1) . . . . 192 Table 178 - Sync, CRC-4 Remote, Alarms, MAS and Phase Interrupt Status Register (Address Y34) (E1). . . . 200 Table 182 - Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Mask Register (Address Y44) (E1) Table 183 - Counter (Counter Indication and Counter Overflow) Interrupt Mask Register (Address Y45) (E1). . 207 Table 184 - National (CAS, National, CRC-4 Local and Timers) Interrupt Mask Register (Address Y46) (E1) . . 209 Table 188 - Transmit National Bits (Sa4 - Sa8) TNn (n = 0 to 4) Data Register Table 189 - Receive National Bits (Sa4 - Sa8) RNn

Zarlink Semiconductor Inc.

1.0 Change Summary

Figure 2 - Pin Connections (Jedec MS-026) Page Item Change 241 “Recommended Operating Conditions” Table. Corrected Min. value to 3.0. 132134136138140142144146148150152154156 22 24 26 168 166 164 162 160 158 2018161412108642 170 188 186 184 182 180 176 174 172 178 190 208 206 204 202 200 196 194 192 198 VDD RPOS[0] RNEG[0] ExCLi[0] TPOS[0] TNEG[0] TxCL[0] RxDL[0] RxDLC[0] TxDL[0] TxDLC[0] RxMF[0] DSTi[0] DSTo[0] CSTi[0] CSTO[[0] CKi[0] FPi[0] RxBF[0] TNEG[2] RPOS[1] RNEG[1] ExCLi[1] TPOS[1] TNEG[1] TRST TCK TMS TDO TDI TxMF TAIS RESET I/M IRQ R/W DS CS A11 A10 VDD VSS D15 D14 D13 D12 D11 D10 VDD VSS RxBF [7] FPi[7] CKi[7] CSTo[7] CSTi[7] DSTo[7] DSTi[7] RxMF [7] TxDLC[7] TxDL[7] RxDLC[7] RxDL[7] TxCL[7] TNEG[7] TPOS[7] ExCLi[7] RNEG[7] RPOS[7] VDD VSS RxBF [6] FPi[6] CKi[6] CSTo[6] CSTi[6] TxDL[6] DSTi[6] RxMF[6] TxCL[6] TxDLC[6]

208 PIN LQFP

130 128 126 124 122 120 118 116 114 112 110 108 106 323028 100 102 104 34 36 38 40 42 44 46 48 50 52 RxDL[1] RxDLC[1] TxDL[1] TxDLC[1] RxMF[1] DSTi[1] DSTo[1] CSTi[1] CSTo[1] CKi[1] FPi[1] RxBF[1] VSS VDD RPOS[2] RNEG[2] E2i[2] TPOS[2] TxCL[2] RxDL[2] RxDLC[2] TxDL[2] TxDLC[2] RxMF[2] DSTi[2] DSTo[2] CSTi[2] CSTo[2] CKi[2] FPi[2] RxBF [2] VSS VDD RPOS[3] RNEG[3] ExCLii[3] TPOS[3] TNEG[3] TxCL[3] RxDL[3] RxDLC[3] TxDL[3] TxDLC[3] RxMF [3] DSTi[3] DSTo[3] CSTi[3] CSTo[3] CKi[3] FPi[3] RxBF [3] VSS VDD RPOS[4] RNEG[4] ExCLi[4] TPOS[4] TNEG[4] TxCL[4] RxDL[4] RxDLC[4] TxDL[4] TxDLC[4] RxMF [4] DSTi[4] CSTi[4] DSTo[4] CSTo[4] CKi[4] FPi[4] RxBF [4] VSS VDD RPOS[5] RNEG[5] DSTo[6] RxDLC[6] RxDL[6] TNEG[6] TPOS[6] ExCLi[6] RNEG[6] RPOS[6] VDD VSS RxBF[5] FPi[5] CKi[5] CSTo[5] CSTi[5] DSTo[5] DSTi[5] RxMF[5] TxDLC[5] TxDL[5] RxDLC[5] RxDL[5] TxCL[5] TNEG[5] TPOS[5] ExCLi5] VSS VDD TxCL[1] VSS

Zarlink Semiconductor Inc. Figure 3 - 220 PIN LBGA (Jedec MO-192) Note: The pin numbers inside the balls for the LBGA package correspond to the pin numbers on the device in the Pin Description Table. 11 12 13 14 15 16567891 04321 L M N P R T E F G H J K D C B A NC 207 TCK 101 VSS NC RNEG[0] RPOS[0] TXCL[0] TNEG[0] TXDLC[0] TXDL[0] CSTI[0] DSTo[0] RXBF[0] FPi[0] TPOS[1] EXCLi[1] RXDLC[1] RXDL[1] DSTI[1] RXMF[1] DSTo[1] CSTOI1] CKI[1] RPOS[2] RNEG[2] TNEG[2] TXCL[2] TXDL[2] TXDLC[2] CKI[0] DSTo[2] CSTI[2] 160 RXBF[7] 159 FPI[7] 166 165 156 CSTI[7] 155 DSTo[7] NC 209 IDDq 205 TDO 206 TMS 202 204 TDI 201 164 163 158 CKI[7] 154 DSTI[7] TXDLC[1] 161 VSS CKI[2] RXMF[2] DSTI[2] RXDL[2] CSTO[2] 157 CSTO[7] CSTI[1] EXCLi[2] 208 203 EXCLi[0] RXDL[0] CSTO[0] RPOS[1] RNEG[1] TXDL[1] TXCL[1] FPi[1] RXBF[1] 153 RXMF[7] TPOS[2] RXDLC[2] RXMF[0] DSTI[0] 141 VSS TPOS[0] 121 VSS RXDLC[0] TNEG[1] RXBF[2] TPOS[3] RXDLC[3] DSTI[3] CSTI[3] TXDL[3] TXDLC[3] TNEG[3] DSTo[3] RPOS[3] RNEG[3] TXCL[3] CSTO[3] CKI[3] RPOS[4] RNEG[4] TNEG[4] TXCL[4] TXDL[4] TXDLC[4] RXDL[4] EXCLi[4] RXMF[ 4] FPI[3] 113 RXMF[5] 114 DSTI[5] 109 RXDL[5] 110 RXDLC[5] 105 EXCLi[5] 106 TPOS[5] FPi[4] 100 RXBF[4] DSTo[4] CSTI[4] CKI[4] 103 RPOS[5] 104 RNEG[5] 107 TNEG[5] CSTO[4] 111 TXDL[5] 115 DSTo[5] 116 CSTI[5] 112 TXDLC[5] 108 TXCL[5] 149 RXDL[7] 145 EXCLi[7] 139 FPI[6] 130 DSTo[6] 138 CKI[6] 137 CSTO[6] 150 RXDLC[7] 146 TPOS[7] 136 CSTI[6] 152 TXDLC[7] 140 RXBF[6] 143 RPOS[7] 151 TXDL[7] 147 TNEG[7] 148 TXCL[7] 144 RNEG[7] 135 TXDL6] 127 TNEG[6] 123 RPOS6] 117 CSTO[5] 120 RXBF[5] 119 FPI[5] 131 TXDLC[6] 132 TXCL6] 118 CKI5] 134 DSTI[6] 124 RNEGI6] 125 EXCLi[6] 133 RXMF[6] 128 RXDL[6] 129 RXDLC[6] 126 TPOS[6] VSS VSS VSS VSS VDD VDD VDD 122 VDD 142 VDD 162 VDD 102 VDD TRST FPI[2] EXCLi[3] RXDL[3] RXMF[3] RXDLC[4] TPOS[4] DSTI[4] RXBF[3] 168 167 169 180 171 172 173 D10 174 177 D14 181 178 D15 182 175 D12 183 187 192 A11 185 186 190 191 A10 193 CS 195 RW 196 IRQ 199 TAIS 200 TXMF 198 RESET 197 194 189 188 184 176 D13 D11A3 VDD A8 A7DSIM Top View VDD 179 VSS 170 VSS VDD NCNC NC NC NC NCNC NC

Zarlink Semiconductor Inc. 106 126 146 P12 P14 K16 E14 TPOS[0] TPOS[1] TPOS[2] TPOS[3] TPOS[4] TPOS[5] TPOS[6] TPOS[7] O Transmit Positive. This pin is an output for the transmit side of the framer; it typically interfaces to an LIU. If used by itself it can provide single rail NRZ (Non Return to Zero) data. If TPOS is used in conjunction with TNEG it can provide dual rail NRZ data or dual rail RZ (Return to Zero) data. The clock at the TXCL pin is used to clock data out of the TPOS pin. Pins TPOS[0-7] are used for Framers[0-7] respectively. In T1 mode, line codes are selected with control bits: TZCS2-0, TPDV, TXB8ZS, RZNRZ and UNIBI (Address Y01). T1 mode is selected if the T1E0 bit (Address 900) is 1. In E1 mode, line codes are selected with control bits: COD0-1 and THDB3 (Address Y02). E1 mode is selected if the T1E0 bit (Address 900) is 0. 107 127 147 P15 J13 E15 TNEG[0] TNEG[1] TNEG[2] TNEG[3] TNEG[4] TNEG[5] TNEG[6] TNEG[7] O Transmit Negative. This pin is an output for the transmit side of the framer; it typically interfaces to an LIU. TNEG is used in conjunction with TPOS to provide dual rail NRZ (Non Return to Zero) data or dual rail RZ (Return to Zero) data. The clock at the TXCL pin is used to clock data out of the TNEG pin. Pins TNEG[0-7] are used for Framers[0-7] respectively. In T1 mode, line codes are selected with control bits: TZCS2-0, TPDV, TXB8ZS, RZNRZ and UNIBI (Address Y01). T1 mode is selected if the T1E0 bit (Address 900) is 1. In E1 mode, line codes are selected with control bits: COD0-1 and THDB3 (Address Y02). E1 mode is selected if the T1E0 bit (Address 900) is 0. 108 132 148 R10 P16 J14 E16 TXCL[0] TXCL[1] TXCL[2] TXCL[3] TXCL[4] TXCL[5] TXCL[6] TXCL[7] IO 1.544/2.048 MHz Transmit Clock. This pin accepts/outputs a clock that is used to clock data out of the transmit side of the framer on pins TPOS and TNEG. If TPOS/TNEG are configured for RZ output then the rising edge of the clock is used to clock TPOS/TNEG data. If TPOS/TNEG are configured for NRZ output then either a rising or falling TxCL edge can be selected to clock TPOS/TNEG data. Pins TxCL[0-7] are used for Framers[0-7] respectively. In T1 mode this pin is an input. The 1.544 MHz transmit clock is typically provided by an external PLL (Phase Lock Loop) or LIU. An active rising or falling edge is selected with the CLKE bit (Address Y01). See Figure 52. In E1 mode this pin is an output. The 2.048 MHz transmit clock is synchronous with the 4.096 MHz ST-BUS clock input to pin CKi. An active rising or falling edge is selected with the T2OP bit (Address Y02). See Figure 71. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 109 128 149 R11 N13 J15 D13 RxDL[0] RxDL[1] RxDL[2] RxDL[3] RxDL[4] RxDL[5] RxDL[6] RxDL[7] O Receive Data Link. The entire received data stream including framing bits, after B8ZS/HDB3 decoding, is clocked out of the RxDL pin by the clock at the EXCLi pin. RxDL data does not pass through the receive slip buffer. The embedded data link is flagged by RxDLC. Pins RxDL[0-7] are used for Framers[0-7] respectively. In T1 mode this is a 1.544 Mbit/s data stream clocked out with the rising edge of the clock at the EXCLi pin. In E1 mode this is a 2.048 Mbit/s data stream clocked out with the falling edge of the clock at the EXCLi pin. 110 129 150 R12 N14 J16 D14 RxDLC[0] RxDLC[1] RxDLC[2] RxDLC[3] RxDLC[4] RxDLC[5] RxDLC[6] RxDLC[7] O Receive Data Link Clock. This pin outputs a clock that can be used to clock selected bits from the RxDL data stream into an external device. The RxDLC pin can also be configured as an enable signal. Pins RxDLC[0-7] are used for Framers[0-7] respectively. In T1 mode the FDL (Facility Data Link) bits embedded in the RxDL data stream can be clocked into an external device with the rising edge of this 4 kHz clock. The rising edge of the clock is centered on the S-bit position and it is coincident with the falling edge of the clock provided to the EXCLi pin. The RxDLC pin can be configured as a clock or an enable signal with the DLCK bit (Address Y06). See Figure 49. In T1 IMA (Inverse Mux for ATM) mode the RxDLC pin outputs the same 1.544 MHz clock that is input to the EXCLi pin. In IMA mode the DSTo data stream will be synchronous with this 1.544 MHz clock. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Figure 39. In E1 mode the selected data link national bits (timeslot 0, bits 4-8 of the NFAS (Non-Frame Alignment Signal) frames) can be clocked into an external device with the rising edge of this clock. The Receive Data Link clock is a gapped 4, 8, 12, 16 or 20 kHz, clock as programmed by the Datalink Control Register (Address Y08), derived by gating the 2.048 MHz clock provided to the EXCLi pin. The RxDLC pin can be configured as a clock or an enable signal with the DLCK bit (Address Y08). See Figure 68. In E1 IMA (Inverse Mux for ATM) mode the RxDLC pin provides an ST-BUS type 4.096 MHz clock derived by doubling the 2.048 MHz clock provided to the EXCLi pin. In IMA mode the DSTo data stream will be synchronous with this 4.096 MHz clock. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Figure 58. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 111 135 151 N15 H13 D15 TxDL[0] TxDL[1] TxDL[2] TxDL[3] TxDL[4] TxDL[5] TxDL[6] TxDL[7] I Transmit Data Link. This pin accepts data from an external device for the Transmit Data Link. Pins TxDL[0-7] are used for Framers[0-7] respectively. In T1 mode this pin accepts a 4 kbit/s serial input stream that contains the ESF FDL (Facility Data Link) bits that are to be embedded in the transmit data stream. The data is clocked in by the rising edge of the clock provided at the TxDLC pin. TxDL data does not pass through the transmit slip buffer. In E1 mode this pin accepts a 4,8,12,16 or 20 kbit/s, as programmed by the Datalink Control Register (Address Y08), data stream which contains the data link national bits (timeslot 0, bits 4-8 of the NFAS (Non-Frame Alignment Signal) frames) for transmission. The selected data link national bits are clocked into the framer by the falling edge of the clock provided at the TxDLC pin. 112 131 152 T10 N16 H14 D16 TxDLC[0] TxDLC[1] TxDLC[2] TxDLC[3] TxDLC[4] TxDLC[5] TxDLC[6] TxDLC[7] O Transmit Data Link Clock. This pin provides a clock that is used to clock transmit data link data out of an external device into the TxDL pin. The TxDLC pin can also be configured as an enable signal. Pins TxDLC[0-7] are used for Framers[0-7] respectively. In T1 mode, this pin provides either a 4 kHz clock derived by gating the 1.544 MHz clock provided to the TxCL pin, or it provides an enable signal. The TxDLC pin can be configured as a clock or an enable signal with the DLCK bit (Address Y06). Transmit data link data does not pass through the transmit slip buffer. See Figure 47. In E1 mode, this pin provides either a gapped 4,8,12,16 or 20 kHz clock, as programmed by the Datalink Control Register (Address Y08), derived by gating the 2.048 MHz clock provided to the TxCL pin, or it provides an enable signal. The TxDLC pin can be configured as a clock or an enable signal with the DLCK bit (Address Y08). See Figure 66. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 113 133 153 T11 M13 H15 C13 RxMF [0] RxMF[1] RxMF[2] RxMF[3] RxMF[4] RxMF[5] RxMF[6] RxMF[7] O Receive Multiframe Boundary. This pin provides a pulse that identifies basic frame 0 (the start of bit cell 7 of channel 0) of each received multiframe on the ST-BUS data stream (DSTo). The RxMF pin operates the same way in 2.048 Mbit/s and 8.196 Mbit/s modes. Pins RxMF [0-7] are used for Framers[0-7] respectively. In T1 mode, the RxMF pulse is 244 ns wide and its center identifies basic frame 0 of the received multiframe. If the Tx8KEN control bit (Address YF1) is 1 then the RxMF pin outputs an 8kHz frame pulse synchronous with the data stream on TPOS/TNEG. See Figure 43 and Figure 45. In T1 IMA mode, the frame pulse duration is 648 ns. In E1 mode, (and E1 IMA mode) the RxMF pulse is 244 ns wide and its center identifies basic frame 0 of the received CAS (Channel Associated Signaling) multiframe boundary or the received CRC-4 multiframe boundary as determined by the MFSEL control bit (Address Y02). If the Tx8KEN control bit (Address Y02) is 1 then the RxMF pin outputs and 8 kHz frame pulse synchronous with the data stream on TPOS/TNEG. See Figure 62 and Figure 64. T12 DSTi[0] DSTi[4] I Data ST-BUS. This pin is an input for the transmit side of the framer. In

2.048 Mbit/s ST-BUS mode and IMA mode it operates the same as

DSTi(1-3), it can also operate in 8.192 Mbit/s ST-BUS mode. IMA mode is not available at 8.192 Mbit/s. The DSTi data stream is clocked into the framer by the clock input to pin CKi. When operated in 8.192 Mbit/s ST-BUS mode this pin accepts a data stream containing 128 8-bit channels accommodating four framers. See Table 2 and Table 5. The frame boundary is indicated by the FPi inputs. Pin DSTi[0] is used by Framers[0-3] and pin DSTi[4] is used by Framers[4-7]. In 8.192 Mbit/s mode, the 32 ST-BUS channels mapped to each framer are treated as described for DSTi(1-3) operating at 2.048 Mbit/s. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 114 134 154 M14 H16 C14 DSTi[1] DSTi[2] DSTi[3] DSTi[5] DSTi[6] DSTi[7] I Data ST-BUS. In 2.048 Mbit/s ST-BUS mode and IMA mode this pin is an input for the transmit side of the framer. This pin is not used in 8.192 Mbit/s ST-BUS mode. The DSTi data stream is clocked into the framer by the clock input to pin CKi. Pins DSTi[0-7] are used by Framers[0-7] respectively. In T1 mode, this pin accepts a 2.048 Mbit/s ST-BUS stream. The first

24 ST-BUS channels contain the data to be transmitted on the PCM24

interface. See Table 1. In T1 IMA mode, this pin accepts a 1.544 Mbit/s serial stream that contains a framing bit followed by the 24 8-bit channels to be transmitted on the PCM24 interface, see Table 3. The framing bit is ignored and an internally generated framing bit is used. IMA mode is selected by setting the IMA bit (Address Y00) to 1. In E1 mode, this pin accepts a 2.048 Mbit/s ST-BUS stream that contains the data to be transmitted on the PCM30 interface. See Table 4 and Table 6. In E1 IMA mode, this pin accepts a 2.048 Mbit/s ST-BUS stream that contains the data to be transmitted on the PCM30 interface. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Table 4 and Table 6. T13 DSTo[0] DSTo[4] O Data ST-BUS. This pin is an output for the receive side of the framer. In 2.048 Mbit/s ST-BUS mode and IMA mode it operates the same as DSTo(1-3), it can also operate in 8.192 Mbit/s ST-BUS mode. IMA mode is not available at 8.192 Mbit/s. The DSTo data stream is clocked out of the framer by the clock input to pin CKi. When operated in 8.192 Mbit/s ST-BUS mode this pin outputs a data stream containing 128 8-bit channels accommodating four framers. See Table 2 and Table 5. The frame boundary is indicated by the FPi inputs. Pin DSTo[0] is used by Framers[0-3] and pin DSTo[4] is used by Framers[4-7]. The 32 ST-BUS channels mapped to each framer are treated as described for DSTi(1-3) operating at 2.048 Mbit/s. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 115 130 155 M15 G13 C15 DSTo[1] DSTo[2] DSTo[3] DSTo[5] DSTo[6] DSTo[7] O Data ST-BUS. In 2.048 Mbit/s ST-BUS mode and IMA mode this pin is an output for the receive side of the framer. This pin is not used in 8.192 Mbit/s ST-BUS mode. Pins DSTo[0-7] are used by Framers[0-7] respectively. In T1 mode, this pin outputs 2.048 Mbit/s ST-BUS data. The first 24 channels contain the 24 8-bit channels received on the PCM24 interface. Channel 31 bit 0 contains the received S-bit in D4 and ESF modes. See Table 1.The DSTo data stream is clocked out of the framer by the clock input to pin CKi. The DSTo pin is enabled if the DSToEN control bit (Address YF1) is set to 1. In T1 IMA mode, this pin outputs the 1.544 Mbit/s received serial stream. The serial stream contains the framing bit followed by the 24 8-bit channels received on the PCM24 interface. See Table 3. In IMA mode the DSTo data stream is clocked out of the framer by the clock output by the RxDLC pin. The DSto pin is enabled if the DSToEN control bit (Address YF1) is set to 1. IMA mode is selected by setting the IMA bit (Address Y00) to 1. In E1 mode, this pin outputs 2.048 Mbit/s ST-BUS data. The 32 channels contain the 32 channels of data received on the PCM30 interface. See Table 4 and Table 6. The DSTo data stream is clocked out of the framer by the clock input to pin CKi. The DSTo pin is enabled if the DSToE control bit (Address Y02) is set to 1. In E1 IMA mode, this pin outputs the 2.048 Mbit/s received serial stream. See Table 4 and Table 6. In IMA mode the DSTo data stream is clocked out of the framer by the clock output by the RxDLC pin. The DSTo pin is enabled if the DSToE control bit (Address Y02) is set to 1. IMA mode is selected by setting the IMA bit (Address Y00) to 1. T14 CSTi[0] CSTi[4] I Control ST-BUS. This pin is the signaling input for the transmit side of the framer. In 2.048 Mbit/s ST-BUS mode it operates the same as CSTi(1-3), it can also operate in 8.192 Mbit/s ST-BUS mode. The CSTi data stream is clocked into the framer by the clock input to pin CKi. This pin has no function in IMA mode. When operated in 8.192 Mbit/s ST-BUS mode this pin accepts a data stream containing 128 8-bit channels accommodating four framers. See Table 2 and Table 5. The frame boundary is indicated by the FPi inputs. Pin CSTi[0] is used by Framers[0-3] and pin CSTi[4] is used by Framers[4-7]. The 32 ST-BUS channels mapped to each framer are treated as described for CSTi(1-3) operating at 2.048 Mbit/s. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 116 136 156 M16 G14 C16 CSTi[1] CSTi[2] CSTi[3] CSTi[5] CSTi[6] CSTi[7] I Control ST-BUS. In 2.048 Mbit/s ST-BUS mode this pin is the signaling input for the transmit side of the framer. This pin has no function in 8.192 Mbit/s ST-BUS mode or IMA mode. Pins CSTi[0-7] are used by Framers[0-7] respectively. The CSTi data stream is clocked into the framer by the clock input to pin CKi. In T1 robbed bit signaling mode the first 24 ST-BUS channels contain (XXXXABCD) signaling nibbles to be transmitted for their respective DS0s. The least significant nibbles (bits 3-0) are valid and the most significant nibbles of each channel are ignored. In T1 CCS (Common Channel Signaling) mode, the CSTi pin can be connected to the output of an external multi-channel HDLC. Any one of the framer’s transmit timeslots can be programmed to transmit the data appearing at the CSTi pin on any one of the first 24 ST-BUS channels. See the descriptions of the CSIGEN control bit (Address Y04) and the Common Channel Signaling Map Register (Address Y0B). In E1 CAS (Channel Associated Signaling) mode, the 32 ST-BUS channels contain (XXXXABCD) signaling nibbles to be transmitted for their respective timeslots. The least significant nibbles (bits 3-0) are valid and the most significant nibbles of each channel are ignored. See Table 25. In E1 CCS (Common Channel Signaling) mode, the CSTi pin can be connected to the output of an external multi-channel HDLC. The framer’s transmit timeslots 15, 16 and 31 can each be programmed to transmit the data appearing at the CSTi pin on any one of the 32 ST-BUS channels. See the descriptions of the CSIG control bit (Address Y03) and the TS15E, TS16E and TS31E control bits (Address Y06) and see Table 27. T15 CSTo(0) CSTo[4] OH Control ST-BUS. This pin is the signaling output for the receive side of the framer. In 2.048 Mbit/s ST-BUS mode it operates the same as CSTo(1-3), it can also operate in 8.192 Mbit/s ST-BUS mode. The CSTo data stream is clocked out of the framer by the clock input to pin CKi. This pin has no function in IMA mode. When operated in 8.192 Mbit/s ST-BUS mode this pin outputs a data stream containing 128 8-bit channels accommodating four framers. See Table 2 and Table 5. The CSTo[0] pin is used by Framers [0-3] and the CSTo[4] pin is used by Framers [4-7]. The frame boundary is indicated by the FPi inputs. FPi[0] is used for Framers[0-3] and FPi[4] is used for Framers[4-7]. The 32 ST-BUS channels mapped to each framer are treated as described for CSTo(1-3) operating at 2.048 Mbit/s. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

CSTo[0-7] are used by Framers[0-7] respectively. (XXXXABCD) signaling nibbles received for their respective DS0s. data on the CSTo pin on any one of the first 24 ST-BUS channels. pin is enabled if the CSToEN control bit (Address YF1) is set to 1. control bit (Address Y02) is set to 1. Table 29. The CSTo pin is enabled if the CSToE control bit (Address as that described for pins CKi[1-3]. framers[0-3] and pin CKi[4] is used by framers[4-7]. See Figure 36. 8.192 Mbit/s operation is not available in IMA mode.

Zarlink Semiconductor Inc. 118 138 158 N10 L14 G16 B14 CKi[1] CKi[2] CKi[3] CKi[5] CKi[6] CKi[7] I System Clock. In 2.048 Mbit/s ST-BUS mode this pin accepts the clock that is used to time the transmit side and receive side of the framer. In IMA mode it accepts the clock that is used to time the transmit side of the framer only. Pins CKi[0-7] are used to time Framers[0-7] respectively. The CKi clock rate is determined by control bits at (Address 900). This pin has no function in 8.192 Mbit/s mode. In 2.048 Mbit/s ST-BUS mode this pin accepts the ST-BUS type

4.096 MHz clock that is used to time the data appearing at pins DSTi,

CSTi, DSTo and CSTo. See Figure 34. In T1 IMA mode this pin accepts the 1.544 MHz clock that is used to time the transmit data appearing at pin DSTi. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Figure 40. In E1 IMA mode this pin accepts the ST-BUS type 4.096 MHz clock that is used to time the transmit data appearing at pins DSTi. IMA mode is selected by setting the IMA bit (Address Y00) to 1. In T1/E1 IMA mode the receive data stream is clocked out of pin DSTo by the clock output by pin RxDLC. R13 FPi[0] FPi[4] I Frame Pulse. This pin accepts a frame pulse that sets the basic frame boundary for the transmit and receive sides of the framer. The clock rate is determined by control bits at (Address 900) In 2.048 Mbit/s mode and in IMA mode, operation is the same as that described for pins FPi[1-3]. In 8.192 Mbit/s mode this pin accepts an 8.192 Mbit/s ST-BUS type frame pulse which sets the frame boundary common to four framers. FPi[0] is used to set the frame boundary for Framers[0-3] and FPi[4] is used to set the frame boundary for Framers[4-7]. See Figure 36. 8.192 Mbit/s operation is not available in IMA mode. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 119 139 159 N11 L15 F13 B15 FPi[1] FPi[2] FPi[3] FPi[5] FPi[6] FPi[7] I Frame Pulse. This pin accepts a frame pulse that sets the basic frame boundary for the transmit and receive sides of the framer. In IMA mode it accepts a frame pulse that sets the basic frame boundary for the transmit side of the framer only. Pins FPi[0-7] are used to set the frame boundaries for Framers[0-7] respectively. The clock rate is determined by control bits at (Address 900). This pin has no function in 8.192 Mbit/s mode. In 2.048 Mbit/s ST-BUS mode this pin accepts an ST-BUS

2.048 Mbit/s frame pulse that sets the basic frame boundary for the

data that appears at pins DSTi, DSTo, CSTi and CSTo. See Figure 34. In T1 IMA mode, this pin accepts a 648 ns frame pulse that sets the basic frame boundary for the transmit data that appears at pin DSTi. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Figure 40. In E1 IMA mode, this pin accepts a 2.048 Mbit/s ST-BUS type frame pulse that sets the basic frame boundary for the transmit data that appears at pin DSTi. IMA mode is selected by setting the IMA bit (Address Y00) to 1. In T1 IMA mode and E1 IMA mode, the basic frame boundary for the receive data stream that is output by DSTo is indicated by the clock output by the RxBF pin. 100 120 140 160 N12 R14 L16 F14 B16 RxBF [0] RxBF[1] RxBF[2] RxBF[3] RxBF[4] RxBF[5] RxBF[6] RxBF[7] O Receive Basic Frame Pulse. This pin outputs a frame pulse that indicates the basic frame boundary for the received data stream output by the RxDL pin. In IMA mode the receive basic frame pulse also indicates the basic frame boundary in the received data stream output by the DSTo pin. Pins RxBF [0-7] are used to set the frame boundaries for Framers[0-7] respectively. In T1 mode, this pin provides a basic frame pulse that indicates the S-bit in the 1.544 Mbit/s received data stream output by pin RxDL. See Figure 48. In T1 IMA mode, the Receive Basic Frame Pulse indicates the S-bit in the 1.544 Mbit/s received data stream output by pin DSTo. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Figure 39. In E1 mode, this pin provides a 2.048 Mbit/s ST-BUS type frame pulse that indicates the beginning of channel 0 in the 2.048 Mbit/s received data stream output by the RxDL pin. See Figure 69. In E1 IMA mode, the receive basic frame pulse indicates the beginning of channel 0 in the 2.048 Mbit/s received data stream output by the DSTo pin. IMA mode is selected by setting the IMA bit (Address Y00) to 1. See Figure 58. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 163-178 A13,A14, A15,A16, B12,A12, C12,D12, A11,B11, C11,D11, C10,D10, B10,A10 D0-D15 I/O Data 0 to 15. These 16 signals form the bidirectional data bus for the non-multiplexed parallel processor interface. D15 is the most significant bit. 181-192 B9,A9,C9, D9,B8,C8, A8,D8,D7, B7,C7,A7 A0-A11 I Address 0 to 11. These 12 signals form the input address bus for the non-multiplexed parallel processor interface. Bits A10 and A8 determine which of the eight framers is selected for read and write operations, bit A11 being high and A8 to A10 being low selects all eight framers for write operations. A11 and A8 being both high and A9 being low selects global control registers. A11 is the most significant bit.

193 A6 CS

I Chip Select. A zero enables the read and write functions of the MT9072 parallel processor interface; all bidirectional data bus lines (D0-D15) will operate normally. A one disables the read and write functions of the parallel processor interface; all bidirectional data bus lines (D0-D15) will be in a high impedance state.

194 D6 DS

I Data Strobe. Data Strobe for Motorola mode (I/M =0). The MT9072 reads data from the address bus (A0-A11) on the falling edge of DS; writes data to the bidirectional data bus (D0-D15) on the falling edge of DS (processor read); reads data from the bidirectional data bus (D0-D15) on the falling edge of DS (processor write). DS may be connected to CS. D6 (RD )I Read. Read for Intel type mode (I/M =1). The MT9072 reads data from the address bus (A0-A11) on the falling edge of RD; writes data to the bidirectional data bus (D0-D15) on the falling edge of RD (processor read). 195 B6 R/W I Read/Write. Read and Write for Motorola mode (I/M=0). A zero sets the MT9072 bidirectional data bus lines (D0-D15) as inputs for a processor write. A one sets the MT9072 bidirectional data bus lines (D0-D15) as outputs (processor read). B6 (WR )I Write. Write for Intel type mode (I/M=1). The MT9072 reads data from the address bus (A0-A11) on the falling edge of WR; reads data from the bidirectional data bus (D0-D15) on the rising edge of WR (processor write). 196 C6 IRQ OH Interrupt Request. When zero, one or more of the eight framers in the MT9072 has generated an interrupt request. When one, the MT9072 has not generated an interrupt request. IRQ is an open drain output that should be connected to VDD through a pull-up resistor. CS can be either high or low for this output pin to function. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 197 D5 IM I Intel / Motorola. High configures the processor interface for Intel type of parallel non-multiplexed processors where RD and WR pins are used. Low configures the processor interface for Motorola type of parallel non-multiplexed processors where R/W and DS pins are used. See Figure 28 and Figure 29. 198 C5 RESET I Reset. When zero, all eight framers of the MT9072 are in a reset condition where all registers are set to their default values. When one, all eight framers of the MT9072 operate normally where all registers may be programmed by the external processor. A valid reset condition requires this input to be held low for a minimum of 100 ns. This input should be set to zero during initial power up, then set to one. 199 A5 TAIS I Transmit Alarm Indication Signal. When zero, all eight framers of the MT9072 transmit an all ones signal (AIS) at the TPOS and TNEG output pins. When one, all eight framers of the MT9072 transmit data normally. This input is typically set to zero during initial power up, then set to one.

200 B5 TxMF

I Transmit Multiframe Boundary. This pin accepts a frame pulse that sets the multiframe boundary for the framer transmitters. The device will generate its own multiframe boundary if this pin is held high. The TxMF pin is held high in most applications. This input is common for all eight framers, and is enabled on a per framer basis with a control register bit. Operation is identical in 2.048 Mbit/s and 8.192 Mbit/s modes. In T1 mode the frame pulse applied to this pin sets the transmitted D4/ESF multiframe boundary. The falling edge of this frame pulse identifies basic frame 0 on the ST-BUS data stream (DSTi). This input is enable with control bit TxMFSEL (Address YF1). See Figure 41. In E1 mode the frame pulse applied to this pin sets the transmitted channel associated signaling (CAS) multiframe boundary or the transmitted CRC-4 multiframe boundary. The falling edge of this frame pulse identifies basic frame 0 on the ST-BUS data stream (DSTi) of the 16 frame multiframe. This input is enabled with control bit MFBE (Address Y02). See Figure 60. 201 A4 RSV -- This pin should be tied low. 202 B4 RSV -- This pin should be tied low. 203 C4 RSV -- This pin should be tied low. 204 A3 TDI IPu Test Data Input. One of five signals (TDI, TDO, TMS, TCK & TRST making up the Test Access Port (TAP) of the IEEE 1149.1-1990 Standard Test Port and Boundary-Scan Architecture. The TAP provides access to test support functions built into the MT9072. The TAP is also referred to as a JTAG (Joint Test Action Group) port. Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

Zarlink Semiconductor Inc. 205 A2 TDO OH Test Data Output. Depending on the sequence previously applied to the TMS input, the contents of either the instruction register or data register are serially shifted out towards the TDO. The data out of the TDO is clocked on the falling edge of the TCK pulses. When no data is shifted through the boundary scan cells, the TDO driver is set to a high impedance state. See the pin description for TDI and the section on JTAG. 206 B3 TMS IPu Test Mode Select Input. The logic signals received at the TMS input are interpreted by the TAP Controller to control the test operations. The TMS signals are sampled at the rising edge of the TCK pulse. Internally pulled up to V DD. See the pin description for TDI and the section on JTAG. 207 B2 TCK IPu Test Clock Input. TCK provides the clock for the test logic. The TCK does not interfere with any on-chip clocks and thus remains independent. The TCK permits shifting of test data into or out of the Boundary-Scan register cells concurrently with the operation of the device and without interfering with the on-chip logic. Internally pulled up to V DD. See the pin description for TDI and the section on JTAG. See Figure 30. 208 C3 TRST IPu Test Reset. When zero, the JTAG scan structure is reset. When one, the JTAG scan structure operates normally. Internally pulled up to VDD. See the pin description for TDI and the section on JTAG. A valid device reset condition requires this input to be held low for a minimum of 100 ns. This input is should be set to zero during initial power up, then set to one if the JTAG port is to be used, otherwise, it may be permanently set to zero. -- B1 RSV -- This pin should be tied low. Notes: 1. All inputs are CMOS with CM OS compatible logic levels. 2. All unused inputs should be tied low. 3. All outputs are CMOS and are co mpatible with CMOS logic levels. 4. See AC Electrical Characteristics - Timing Parameter Measurement Voltage Levels for input and output voltage thresholds. 5. The number enclosed in parentheses following the pin name identifies the framer as follows: [0] - framer 0, [1] - framer 1, [2] - framer 2,... [7] - framer 7 6. The “Y” character in the register address symbolizes the upper 4 address bits (A 11A10A9A8) which identify the particular framer addressed within the MT9072 as follows: [8] 1000 - all 8 framers. 7. Pin types are as follows: I - input (5 V tolerant input IP - input with a pullup or pulldown, these are 3 V tolerant inputs. O - output I/O - input and output OH - output and high impedance OD - output open drain Pin Description (continued) Pin # Name Type Description (see Notes 1 to 7) LQFP LBGA

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2.0 Overview

The MT9072 is an eight port (octal) framing device that can be software configured for T1, E1 or J1 operation. Each of the eight framers can be independently timed and co ntrolled. Each framer features one embedded HDLC (High-level Data Link Controller) that can be assigned to the maintenance channel or to any other channel.

2.1 Standards Compliance

In T1 mode, the MT9072 meets or supports the latest recommendations including AT&T PUB43801, TR-62411, calculation and yellow alarm can be configured to meet the requirements of a J1 interface. In E1 mode, the MT9072 meets or supports the latest ITU-T Recommendations for PCM30 and ISDN primary rate TBR4, TBR13, ETS 300 233, and ETS 300 347 (V5.2).

2.2 Microprocessor Port

A 16-bit parallel Motorola or Intel non-multiplexed microprocessor interface is used to access the control and status registers.

2.3 Interface to the Physical Layer Device

On the line side the MT9072 framers interface to physical layer devices (typically LIUs) using a Return to Zero (RZ) or Non Return to Zero (NRZ) protocol. The data can be singl e rail or dual rail with several T1 and E1 line coding options available. In T1 mode, the receive and transmit paths each include a tw o-frame slip buffer. The transmit slip buffer features programmable delay and it serves as a rate converter between the ST-BUS and the 1.544 Mbit/s T1 line rate. In E1 mode, the receive path includes a two-frame slip buffer.

2.4 Interface to the System Backplane

On the system side the MT9072 framers can interface to a 2.048 Mbit/s or 8.192 Mbit/s ST-BUS backplane, or a 2.048 Mbit/s GCI backplane. There is an IMA (Inverse MUX for ATM) mode for IMA app lications, this enables the framer to interface to a 1.544 Mbit/s (T1) or 2.048 Mbit/s (E1) serial bus with asynchronous transmit and receive timing.

2.5 Framing Modes

The MT9072 framers operate in termination mode or trans parent mode. In the receive transparent mode, the received line data is channelled to the DSTo pin with ar bitrary frame alignment. In the transmit transparent mode, no framing or signaling is imposed on the data transmitted from the DSTi pin onto the line. In T1 mode the framers operate in any of the following framing modes: D4, Extended Superframe (ESF) or T1DM. In E1 mode the framers run three fram ing algorithms: basic frame alignment, signalling multiframe alignment and CRC-4 multiframe alignment. The Remote Alarm Indication (RAI) bit is automatically controlled by an internal state machine.

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2.6 Access to the Maintenance Channel

The T1 ESF Facility Data Link (FDL) bits can be accessed in the following three ways: Through the data link pins TxDL, RxDL, RxDLC and TxDLC or through internal regist ers for Bit Oriented Messages or through the embedded HDLC. In E1 mode the Sa bits (bits 4-8 of the non-frame ali gnment signal) can be accessed in four ways: Through data link pins TxDL, RxDL, RxDLC and TxDLC or through single byte transmit and receive registers or through five byte transmit and receive national bit buffers or through the embedded HDLC.

2.7 Robbed Bit Signaling/Channel Associated Signaling

Robbed bit signaling and channel associated signaling info rmation can be accessed two ways: Via the microport; via the CSTi and CSTo pins. Signaling information is frozen upon loss of multiframe alignment. In T1 mode the MT9072 supports AB and ABCD robbed bit signaling. Robbed bit signaling can be enabled on a channel by channel basis. In E1 mode the MT9072 supports Channel Associated Signaling (CAS) multiframing.

2.8 Common Channel Signaling

MT9072 supports Common Channe l Signaling (CCS) with the embedded HDL Cs and with the capability to map external HDLCs to/from the transmit/receive timeslots. In T1 mode CCS is supported in any one channel by using the embedded HDLC. Alternatively, the CSTi and CSTo pins can be used to map an external HDLC channel to/from any one transmit/receive T1 channel. In E1 mode CCS is supported in any one timeslot by using the embedded HDLC. Alternatively, the CSTi and CSTo pins can be used to map three external HDLC channels to/from any of transmit/receive E1 timeslots 15, 16 and 31.

2.9 HDLCs

The MT9072 provides one embedded HDLC per framer with 32 byte deep transmit and receive FIFOs. In T1 mode the embedded HDLC can be assigned to the FDL or any channel. It can operate at 4 kbit/s (Data Link), 56 kbit/s or 64 kbit/s. In E1 mode the embedded HDLC can be assigned to timesl ot zero Sa bits (bits 4- 8 of the non-frame alignment signal), or any other timeslot. It can operate at 4, 8, 12, 16, 20 (Data Link) or 64 kbit/s.

2.10 Performance Monitoring and Debugging

The MT9072 has a comprehensive suite of performance monitoring and debugging features. These include error counters, loopbacks, deliberate error insertion and a 215 –1 QRS/PRBS generator/detector.

2.11 Interrupts

The MT9072 provides a comprehensive set of maskable interr upts. Interrupt sources consist of synchronization status, alarm status, counter indicati on and overflow, timer status, slip in dication, maintenance functions and receive signaling bit changes.

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3.0 PCM24 Interface (T1)

3.1 T1 Interface to the System Backplane

PCM24 (T1) basic frames are 193 bits long and are transmitted at a frame repetition rate of 8000 Hz, which results in an aggregate bit rate of 193 bits x 8000/sec =1.544 Mbits/sec. Basic frames are divided into 24 channels numbered 1 to 24 and a framing bit; see Figure 4. Each timeslot is 8 bits in length and is transmitted most significant bit first (numbered bit 1). This results in a single channel data rate of 8 bits x 8000/sec. = 64 kbit/s. Figure 4 - PCM24 Link Frame Format (T1) It should be noted that the Zarlink ST-BUS has 32 channel s numbered 0 to 31 and the mo st significant bit of an eight bit channel is numbered bit 7, see Figure 5. Therefore, ST-BUS bit 7 is synonymous with DS0 bit 1; bit 6 with bit 2 and so on. See Zarlink Application note MSAN-126 for more details on the ST-BUS. Figure 5 - ST-BUS Format In the case of mapping ST-BUS to the PCM24 payload, only the first 24 channels and the last channel (31) of an ST-BUS are used (see Table 1). Timeslot 31 S-bit is only used if TXSYNC bit Y0 0 is set. All unused channels are tristate. DS1 FRAME (8/1.544) us CHANNEL BIT 1 BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 CHANNEL CHANNEL CHANNEL S BIT S BIT CHANNEL 125 us (1/1.544) us CHANNEL 31 or 127 0 30 or 126 BIT CHANNEL CHANNEL CHANNEL CHANNEL 31 or 127 0 BIT BIT BIT BIT BIT BIT BIT

• • Least Significant Bit (Last) Most Significant Bit (First) 125µs 765 432 1 0

Zarlink Semiconductor Inc. The relationship between DSTi/CSTi and the voice channels in 8.192 Mbit/s mode is shown in Table 2 (F01-F7 refer to the Framer numbers). There are 2 multiplexed stream s (DSTi/o0 and CSTi/o0 are used to multiplexed data for Framers 0 to 3 and DSTi/o4 and CSTi/o4 is used for framers 5 to 7). When the device is in IMA (Inverse Mux for ATM) mode, the mapping is the S-bit followed by 24 PCM channels. This relationship is shown in Table 3. Note that the S-bit location in the Table is indicated by the bit number; which starts from bit 0. Hence the strict definition of ST-BUS channels is not adhered to. As in a T1 interface the data on the DSTi/o is a bit followed by 24 channels. When signaling information is written to the MT9072 using ST-BUS control links (as opposed to direct writes by the microport to the on-board signaling registers), the CSTi ch annels corresponding to the selected DSTi channel streams are used to transmit the signaling bits. Since the maximum number of signaling bits associated with any channel is 4 (in the case of ABCD), only half a CSTi (bits 3 to 0) channel is required for sourcing the signaling bits. Bit A is bit 3 from the CSTi stream, Bit B is 2, Bit C is 1 and Bit D is 0. Unused channels and unused bits are tristate. In T1 transparent mode, the DSTi data is transparently sent to the PCM24 channels. In transparent mode the data on the DSTi streams will appear una ltered on the PCM24 links and data re ceived on the PCM24 link will pass unaltered to the DSTo streams. No si gnaling insertion or extraction is done in transparent mode. If the TxSYNC control bit (address Y00) is 1 then the transmit S-bit is overwritten by channel 31 bit 0 in the 2.048 Mbit/s ST-BUS mode. In the 8.192 Mbit/s ST-BUS mode the S-bits from channels 124, 125, 126, 127 respectively are used to override the transmit S-bit positions for Framers 0 to 3 or 4 to 7 respectively. If T1 Transparent mode and IMA mode are both selected then the S-bit and channel bits are transparently mapped as shown in Table 3. PCM24 Channels 123456789 1 0 1 1 1 2 1 3 1 4 1 51 6 ST-BUS Channels (DSTi/o and CSTi/o) 0123456779 1 0 1 1 1 2 1 3 1 41 5 PCM24 Channels 17 18 19 20 21 22 23 24 - - - ---- S - b i t ST-BUS Channels (DSTi/o and CSTi/o) 16 17 18 19 20 21 22 23 24 x x x x x x x Table 1 - ST-BUS vs. PCM24 Channel Relationship for 2.048 Mbit/s DST/CST Streams (T1) PCM24 Channels 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ST-BUS F0/4 Chan(DSTi/o F1/5 and CSTi/o) F2/6 F3/7 ST-BUS F0/4 Chan(DSTi/o F1/5 and CSTi/o) F2/6 F3/7 124 125 126 127 Table 2 - ST-BUS Channel vs. PCM24 Channel Relationship for 8.192 Mbit/s DST/CST Streams (T1)

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3.2 T1 Interface to the Physical Layer Device

Control bits in the Line Interface and Coding word (addre ss Y01) determine the format of the PCM24 transmit and receive signals. Three physical interface formats are provided including RZ dual rail, NRZ dual rail and NRZ single rail. The detailed timing diagrams are presented in Figures 45 to Figures 48. RZ Dual Rail - On the Transmit side the pulse width is approxi mately half the duration of the PCM24 bit cell centered around the falling edge of TXCL. On the receive side RPOS and RNEG are sampled on the falling edge of EXCLi. Note that the CLKE bit in register Y01 (selectable for edge sampling) has no effect in RZ mode. NRZ Dual Rail - With this format, pulses are present for the full bit cell, which allows the set-up and hold times to be easily met. For the receiver the sampling point can be the rising edge or the falling edge of the EXCLi clock, depending on the CLKE bit in Register Y01. The transmitted data can be output either on the rising or falling edge of TXCL selected by the CLKE bit. TXCL is an input in T1 mode and an output in E1 mode. NRZ Single Rail - This NRZ format is not dual rail, and therefore, onl y requires a single output line and a single input line (i.e., TPOS and RPOS). The CLKE bit in R egister Y01 controls the TXCL clock edge and the EXCLi sampling edge.

3.3 T1 Line Coding

B8ZS (zero code substitution) is selectable globally fo r both the transmit and receive path (register Y01). Jammed bit 7, GTE, DDS or BELL zero code suppression are also available for the transmitter and receiver(register Y01). Different schemes for provision of ones density can be selected with bits ZCS2:0 (registers Y01). GTE suppression is achieved by replacing the LSB of zero bytes by a one except for the signaling frame. DDS suppression is replacement of zero byte by 10011000. Bell code suppressi on is replacement of bit 1(second bit after LSB) of a zero byte. Jammed bit seven selection will replace the LSB of each channel with a ’1’.

3.4 T1 Pulse Density

Bit 4 of address Y10 (PDV) t oggles if the receive data fails to meet on es density requirements. It will toggle upon detection of 16 consecutive zeros in the line data, or if there are fewer than N ones in a window of 8(N+1) bits - where N = 1 to 23. The transmit T1 data is monitored and if the 12.5% density requirement is not met over a maximum 192 bit window a one is inserted in a non-framing bit. The window and PDV criteria is the same as the received PDV. PCM24 Channels S bit 1 2 3 456789 1 0 1 1 1 2 1 3 1 4 1 5 ST-BUS Channels (DSTi/o) Bit 0 1 2 3456789 1 0 1 1 1 2 1 3 1 4 PCM24 Channels 16 17 18 19 20 21 22 23 24 ST-BUS Channels (DSTi/o) 15 16 17 18 19 20 21 22 23 Table 3 - ST-BUS vs. PCM24 to Channel Relationship for IMA DST Streams (T1)

4.0 PCM30 Interface (E1)

4.1 E1 Interface to the System Backplane

Figure 6. Each timeslot is 8 bits in length and is transmitted most significant bit first (numbered bit 1). This results in a single timeslot data rate of 8 bits x 8000/sec. = 64 kbit/s. with bit 2: and so on, see Zarlink Application Note MSAN-126 for more details on the ST-BUS. Tables 4 and 5 show the mapping between the ST-BUS channels and the PCM30 timeslots. PCM30 timeslots is according to Table 4. and bit numbering. However, channels are numbered 1 to 30 and relate to timeslots as per Table 6.

Zarlink Semiconductor Inc. Figure 6 - PCM30 Format (E1)

4.2 E1 Interface to the Physical Layer Device

Register control bits COD1-0 (address Y02) determine the format of the PCM30 transmit and receive signals. Three interface formats are provided including RZ dual rail, NRZ dual rail and NRZ single rail. RZ Dual Rail - On the Transmit side the pulse width is approxi mately half the duration of the PCM30 bit cell centered around the falling edge of TXCL. On the receive side RPOS and RNEG are sampled on the falling edge of EXCLi. Note that the T2OP bit in Register Y02 (selectable for edge sampling) has no effect in RZ mode. NRZ Dual Rail - With this format, pulses are present for the full bit cell, which allows the set-up and hold times to be easily met. For the receiver the sampling point can be the rising edge or the falling edge of the EXCLi clock dependent on the CLKE bit in Register Y01. The transmitt ed data can be output either on the rising or falling edge of TXCL selected by the T2OP bit. TXCL is an input in T1 mode and output in E1 mode. NRZ Single Rail - This NRZ format is not dual rail, and therefore, onl y requires a single output line and a single input line (i.e., TPOS and RPOS). The T2OP bit cont rols the TXCL clock edge and CLKE bit controls the RPOS/RNEG sampling. HDB3 - Register Control bit THDB3 (address Y02) determines the PCM30 encod ing in the transmit direction. The encoding can either be HDB3 or altern ate mark inversion (AMI). The RHDB3 (address Y02) bit selects the receive HDB3 decoding. PCM30 Voice/Data Channels Table 6 - PCM30 Timeslot to PCM30 Channel Relationship (E1) FRAME 15 0 14 15 0 TIMESLOT 01 3 0 3 1 Most Significant Bit (First) Least Significant Bit (Last) BIT 12 34 56 78 FRAMEFRAMEFRAMEFRAME TIMESLOT TIMESLOT TIMESLOTBIT BIT BIT BIT BIT BITBIT 2.0 ms (8/2.048) µs 125 µs

•••

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5.0 Framing

5.1 T1 Framing

DS1 trunks contain 24 bytes of serial voice/data cha nnels bundled with an overhead bi t - the S-bit. The S-bit contains a fixed repeating pattern used to enable DS1 rece ivers to delineate frame boundaries. S-bits are inserted once per frame at the beginning of the transmit frame boundary. The DS1 frames are further grouped in bundles of frames, generally 12 (for D4 applications) or 24 frames deep (for ESF - extended superframe applications). The registers for controlling and observing the framing algorithms are presented in the Table 7. Register Address Register Description Y00 Framing Mode Select This register is us ed for selecting the different framing modes from ESF to D4 or T1DM. The register is also used for selecting reframe criteria. Y10 Synchronization and Alarm Status Word. This register provides the real time status of the receive framing algorithm as to basic frame synchronization and multiframe synchronization. Y16 MFOOF Counter This status register in crements every 1.5 msec for D4 mode or every 3 msec for ESF mode when the basic frame synchronization is lost. Y17 Framing Bit Error Counter This counter counts t he Ft errors in ESF mode and Ft+Fs error in D4 and T1DM. Y19 CRC-6 Error Counter This counter co unts the CRC-6 errors by comparing the calculated CRC-6 with the CRC-6 bits in the ESF frame. Y1A Out of Frame Counter and Change of Frame Counter The out of frame counter is incremeted with every loss of receive frame synchronization. The change of frame counter is incremented with every shift in the frame alignment position. Y24 Receive Sync and Alarm Latch Th is register contains latched bits for events related to framing such as framing bit errors. Y28 Framing Bit Error Count Latch This counter is a la tched version of Y17, the value of this counter is updated every 1 sec. Y2A CRC-6 Error Counter Latch This counter is a latc hed version of Y19, the value of this counter is updated ever 1 sec. Y2B Out of Frame Counter Latch and Change of Frame Counter Latch This counter is a latched version of Y19, the value of this counter is updated ever 1 sec. Y2C MFOOF Counter Latch This counter is a latched version of Y16, the value of this counter is updated ever 1 sec. Y34 Receive Sync Interrupt Status Register This register captures interrupt events related to the receiver framer such as Framing Bit error. Interrupts can be generated by setting appropriate masks. Y44 Receive Sync Interrupt Status Register Mask This mask corresponds to the Y34 status register. Writing a “0” unmasks an interrupt. Table 7 - Registers Related to Framing Mode for the MT9072 (T1)

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5.1.1 T1 D4 Framing

For D4 links the S-bit position contains an alternating 101010... pattern inserted into every second S-bit. These bits are intended for determination of frame boundaries, and they are referred to as Ft bits. A separate fixed pattern, repeating every superframe, is interleave d with the Ft bits. This fixed pattern (001110) is used to delineate the 12 frame superframe. These bits are referred to as the Fs bits. In D4 frames # 6 and #12, the LSB of each channel byte may be replaced with A bit (frame #6) and B bit (frame #12) signaling information. See Table 8.

5.1.2 T1 ESF Framing

For ESF links the 6 bit framing pattern 001011, inserted into every 4th S-bit position, is used to delineate both frame and superframe boundaries. Frames #6, 12, 18 and 24 may contain the A, B, C and D signaling bits, respectively. A 4 kHz data link is embedded in the S-bit position, interleaved between the framing pattern sequence (FPS) and the transmit CRC-6 remainder (from the calculation done on the previous superframe). See Table 9. Frame # Ft Fs Signaling 61 A 10 1 11 0 12 0 B Table 8 - D4 Superframe Structure (T1) Frame # FPS FDL CRC Signaling 2C B 1 6C B 2 A Table 9 - ESF Superframe Structure (T1)

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5.1.3 T1 T1DM Framing

The Ft and Fs bits are identical to the D4 format, channel 24 of each frame has a synchronization byte consisting of 10111YR0. Y is used to indicate a yellow alarm and is active lo w. R bit is reserved by AT&T as an 8 Kb/s communication channel. The synchronization is first declared if the Ft bit is in sync and subsequently 6 consecutive T1DM synchronization bytes are received. The synchronization error criteria for the receiver will be the same as D4 (i.e., 2 out of 4, 5 or 6). Although an error is detected if any of 5 synchronization bits or the Ft/Fs bits are incorrect.The OOF error selection criteria of 2 errors out of 4, 5, 6 bits is also applicable to the T1DM sync byte format; the error criteria applies to the synchronization byte and the framing bit. The received sync byte can be monitored by the status register(Y10). The Y bit an be sent by writing to cont rol register (address Y02). The TIDMR bi t can only be input from the Transmit Data Link Pin. The registers and bits used for T1DM are indicated in the register bit functions. 5.1.4 T1 G.802 Mode G.802 mode allows interworking between an E1 and T1 system. The line is operating in T1 mode and the backplane consists of E1 data. The mapping for the backp lane channels to the PCM24 side is as shown Table 10. The 193 bits from the E1 backplane stream are mapped to the 193 bits of the PCM24 side. The channel 0 and channel 16 on the backplane side are the G.704 Timeslot 0 and 16 channels and are not mapped.

10 CB3

14 CB4

18 CB5 C

22 CB6

Frame # FPS FDL CRC Signaling Table 9 - ESF Superframe Structure (T1)

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5.2 E1 Framing

The following Table shows the registers related to the E1 framing algorithm. DSTi/DSTo Channel#, Bit# PCM24 bits Function

0 Not mapped Timeslot 0

1, bit 7(MSB) S-bit S-bit 1(bit 6 to 0)-15 119 bits

16 Not mapped Timeslot 16

channel 16, bit 1 193 bit last bit Table 10 - G.802 ST-BUS to PCM24 Mapping (T1) Register Address Register Description Y00 Alarm and Framing Control Register This is the main register for selection of the framing mode. The specific bits for control of the framer are CSYN, AUTY, CRCM, REFRM, MFRF and AUTC Y10 Synchronization and Alarm Status Word. This register provides the real time status of receive basic frame synchronization and receive multiframe synchronization. All bits in this status register are relevant to framing except the slip bits. Y11 CRC-4 Timers and CRC-4 Local Status All bits except the 2 sec timer are related to the reception of the CRC-4 pattern in timeslot 0. Y12 Alarm and Multiframe signaling Status This register reports alarms such as AIS, loss of signal and Timeslot 16 and 0 remote alarms. The bits of relevance for framing are KLVE, LOSS,AIS16, AIS,RAI,RMA1 to 4, Y bit. Y13 NFAS and FAS Status Register This register shows the FAS and NFAS status such as RFA 2 to 8 and RNFA. Y16 Loss of basic frame synchronization counter This counter increments by one every 125 usec when the BSYNC status is set to 1. Y19 CRC-4 Error Counter This error counter is incremented for each calculated CRC-4 submultiframe error. The CRCS1 and CRCS2 (Y11 bit 1 and 2) events increment this counter. Y1A FAS Bit Counter and FAS Error Counter. This register reflects the FAS bit errors and a combined FAS pattern error. Y24 Sync,CRC-4,MAS Latched Status Register This register represents the latched version of framing status bits such as BSYNC. These bits are set by changes in the associated real time bits. Table 11 - Registers Related to Framing for MT9072 (E1)

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5.2.1 E1 Basic Framing (Timeslot 0)

Timeslot 0 of every 125 us frame is reserved for basi c frame alignment and contains a Frame Alignment Signal (FAS) or a Non-Frame Alignment Signal (NFAS). FAS and NFAS occur in consecutive basic frames as shown in Table 12. Bit one of the FAS can be either a CRC-4 remainder bit or an international usage bit. Bit one of the NFAS can be either a CRC-4 multiframe alignment signal, an E-bit or an international usage bit. Refer to national standards bodies for specific requirements. Bit two of the FAS and NFAS is used to distinguish between FAS (bit two = 0) and NFAS (bit two = 1) frames. Bits two to eight of the FAS are used for basic frame ali gnment. Basic frame alignment is initiated by a search for the bit sequence 0011011 which appears in the last seve n bit positions of the FAS, see the Frame Algorithm section. Bit three of the NFAS (designated as “A”), the Remote Alarm Indication (RAI), is used to indicate the near end basic frame synchronization status to the far end of a link. Unde r normal operation, the A (RAI ) bit should be set to 0, while in alarm condition, it is set to 1. Bits four to eight of the NFAS (i.e., Sa4-8) are additional spare bits which may be used as follows:

Sa4-8 may be used in specific point-to-point applications (e.g., transcoder equipments conforming to G.761)
Sa4 may be used as a message-based data link fo r operations, maintenance and performance monitoring
Sa5-Sa8 are for national usage but are also available from the Data link interface(TxDL,RxDL)
Note that for simplicity all Sa bits including Sa4 are co llectively called national bits throughout this document. See the Data Link section for accessing the national bits. Y27 Performance Presistent Latched Status Register This register latches the detection of loss(LOSSP) and basic frame sync(BSYNCP). Y2A CRC-4 Error Counter Latch. This a a sampled version of Y19 latched every one sec. Y34 Sync, CRC-4 Remote,Alarm,MAS and Phase Status Register These are the interrupt status bits for BSYNC , Receive Multiframe Alignment Interrupt etc. Y35 Counter Indication and Counter Overflow Interrupt status This register represents the interrupt status bits for counter overflows, counter indications etc. Y44 Sync Interrupt Mask Register This is the ma sk register for the events in register Y34. Y45 Counter Indication and Counter Overflow Interrupt Mask Register This is the mask register for the events in register Y35. Register Address Register Description Table 11 - Registers Related to Framing for MT9072 (E1)

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5.2.2 E1 CRC-4 Multiframing (Timeslot 0)

The primary purpose for CRC-4 multiframing is to provide a verification of the curr ent basic frame alignment, although it can also be used for other functions such as bit error rate estimation. The CRC-4 multiframe consists of 16 basic frames numbered 0 to 15, and has a repetition rate of 16 frames X 125 microseconds/frame = 2 msec. CRC-4 multiframe alignment is based on the 001011 bit sequence, which appears in bit position one of the first six NFASs of a CRC-4 multiframe. The CRC-4 multiframe is divided into two submultiframes, numbered 1 and 2, which are each eight basic frames or 2048 bits in length. The CRC-4 frame alignment verification functions as follows. Initially, the CRC-4 operation must be activated and CRC-4 multiframe alignment must be achieved at both ends of the link. At the local end of a link, all the bits of every transmit submultiframe are passed through a CRC-4 polynomial (multiplied by X4 then divided by X4 + X + 1), which generates a four bit remainder. This remainder is inserted in bit position one of the four FASs of the following submultiframe before it is transmitted (see Table 12). CRC-4 CRC-4 Frame/Type PCM30 Channel Zero 1 2 3 45678 Sub Multi Frame 1 0/FAS C 1 0 0 11011 1/NFAS 0 1 A S a4 Sa5 Sa6 Sa7 Sa8 2/FAS C 2 0 0 11011 3/NFAS 0 1 A S a4 Sa5 Sa6 Sa7 Sa8 4/FAS C 3 0 0 11011 5/NFAS 1 1 A S a4 Sa5 Sa6 Sa7 Sa8 6/FAS C 4 0 0 11011 7/NFAS 0 1 A S a4 Sa5 Sa6 Sa7 Sa8 Sub Multi Frame 2 8/FAS C 1 0 0 11011 9/NFAS 1 1 A S a4 Sa5 Sa6 Sa7 Sa8 10/FAS C 2 0 0 11011 11/NFAS 1 1 A S a4 Sa5 Sa6 Sa7 Sa8 12/FAS C 3 0 0 11011 13/NFAS E 1 1A S a4 Sa5 Sa6 Sa7 Sa8 14/FAS C 4 0 0 11011 15/NFAS E 2 1A S a4 Sa5 Sa6 Sa7 Sa8 Table 12 - CRC-4 FAS and NFAS Structure (E1) indicates position of CRC-4 multiframe alignment signal.

Zarlink Semiconductor Inc. The submultiframe is then transmitted and, at the far end, the same process occurs. That is, a CRC-4 remainder is generated for each received submultiframe. These bits are co mpared with the bits received in position one of the four FASs of the next received submultiframe. This process takes place in both directions of transmission. When more than 914 CRC-4 errors (out of a possible 1000) are counted in a one second interval, the framing algorithm will force a search for a new basic frame alignment if automatic CRC-4 interworking is not invoked. The result of the comparison of the received CRC-4 re mainder with the locally generated remainder will be transported to the far end by the E-bits. Therefore, if E 1 = 0, a CRC-4 error was discovered in a submultiframe 1 received at the far end; and if E 2 = 0, a CRC-4 error was discovered in a submultiframe 2 received at the far end. No submultiframe sequence numbers or re-transmission capabilities are su pported with layer 1 PCM30 protocol. See ITU-T G.704 and G.706 for more details on the operation of CRC-4 and E-bits.

5.2.2.1 E1 Auto matic CRC-4 Interworking

When control bit AUTC (register address Y00) is set to zero, the MT9072 framing algorithm supports automatic interworking of interfaces with and without CRC-4 processing capabilities. That is, if an interface with CRC-4 capability, achieves valid basic frame alignment, but does not achieve CRC-4 multiframe alignment by the end of a predefined period, the distant end is considered to be a non-CRC-4 interface. When the distant end is a non-CRC-4 interface, the near end automatically suspends receive C RC-4 functions, continues to transmit CRC-4 data to the distant end with its E-bits set to zero, and provides a stat us indication. Naturally, if the distant end initially achieves CRC-4 synchronization, CRC-4 processing will be carried out by both ends. When control bit AUTC is one, Automatic CRC-4 Interworking is deactivated. In this case, if the Automatic Remote Alarm Indication (RAI) Operation (ARAI ) control bit (register address Y00) is low, and if CRC-4 multiframe alignment is not found in 400 msec, then the transmit Re mote Alarm Indication (RAI) (bit 3 (A) of the transmit NFAS) will be continuously high until CRC-4 multiframe alignment is achieved. The TE control bit (regi ster address Y00) for transmit E bits will have the same f unction in both st ates of AUTC . That is, when CRC-4 synchronization is not achieved the state of the transmit E-bits will be the same as the state of the TE control bit. When CRC-4 synchronization is achieved the transmit E-bits will function as per ITU-T G.704 as described in the previous section. Table 13 outlines the operation of the AUTC , ARAI and TALM control bits of the MT9072.

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5.2.3 E1 Channel Associated Signaling (CAS) Multiframing (Timeslot 16)

Refer to the section on Channel Associated Signaling (CAS) Operation.

5.2.4 E1 Framing Algorithm

The MT9072 contains three distinct framing algorithms: basic frame alignment, signaling multiframe alignment and CRC-4 multiframe alignment. Figure 7 is a state diagram that illustrates these algorithms and how they interact. After power-up, the basic frame alignment framer will s earch for a frame alignment signal (FAS) in the PCM30 receive bit stream. Once the FAS is detected, the corres ponding bit 2 of the non-fram e alignment signal (NFAS) is checked. If bit 2 of the NFAS is zero a new search for basi c frame alignment is initiated. If bit 2 of the NFAS is one and the next FAS is correct, the algorithm declares that basic frame synchronization has been found (status register address Y10 bit BSYNC is reset to zero). Once basic frame alignment is acqu ired the signalin g and CRC-4 multiframe searches will be initiated. The signaling multiframe algorithm will align to the first multiframe alignment signal pattern (MFAS = 0000) it receives in the most significant nibbl e of channel 16 (status register address Y10 bit M SYNC is zero). Signaling multiframe alignment will be lost when two consecutive multiframes are received in error. The CRC-4 multiframe alignment signal is a 001011 bit sequen ce that appears in PCM30 bit position one of the NFAS in frames 1, 3, 5, 7, 9 and 11 (see Table 12). In order to achieved CRC-4 synchr onization two consecutive CRC-4 multiframe alignment signals must be receiv ed without error (status register address Y10 bit C SYNC is zero). The MT9072 framing algorithm supports automatic interw orking of interfaces with and without CRC-4 processing capabilities. That is, if an interf ace with CRC-4 capability, achieves va lid basic frame alignment, but does not AUTC ARAI TALM Description 00X Automatic CRC-interworking is activated. If no valid CRC MFAS is being received, transmit RAI will flicker high with every reframe (8 msec), this cycle will continue for 400 msec., then transmit RAI will be low continuously. The device will stop searching for CRC MFAS, continue to transmit CRC-4 remainders, stop CRC-4 processing, indicate CRC-to-non-CRC operation and transmit E-bits to be the same state as the TE control bit (control register address Y00). 010 Automatic CRC-interworking is activated. Transmit RAI is low continuously. 011 Automatic CRC-interworking is activated. Transmit RAI is high continuously. 10X Automatic RAI is activated. Automatic CRC-interworking is de-activated. If no valid CRC MFAS is being received, transmit RAI flickers high with every reframe (8 msec), this cycle continues for 400 msec, then transmit RAI becomes high continuously. The device continues to search for CRC MFAS and transmit E-bits are the same state as the TE control bit. When CSYN = 0, the CRC MFAS search is terminated and the transmit RAI goes low. 110 Automatic RAI is activated. Automatic CRC-interworking is de-activated. Transmit RAI is low continuously. 111 Automatic RAI is activated. Automatic CRC-interworking is de-activated. Transmit RAI is high continuously. Table 13 - Operation of AUTC , ARAI and TALM Control Bits (E1)

Zarlink Semiconductor Inc. achieve CRC-4 multiframe alignment by the end of a predefined period, the distant end is considered to be a non-CRC-4 interface. When the distant end is a non-CRC-4 interface, the near end automatically suspends receive CRC-4 functions, continues to transmit CRC-4 data to the distant end with its E-bits set to zero, and provides a status indication. Naturally, if the distant end initially achi eves CRC-4 synchron ization, CRC-4 processing will be carried out by both ends. This featur e is selected when control bit AUTC (control register address Y00) is set to zero.

5.2.4.1 Notes for Synchronization State Diagram (Figure 7)

The basic frame alignment, signaling multiframe alignment, and CRC-4 multiframe alignment functions operate in parallel and are independent. 2. The receive channel associated signaling bits and sig naling multiframe alignment bit will be frozen when multi- frame alignment is lost. 3. Manual re-framing of the receive basic frame alignment and signaling multiframe alignment functions can be performed at any time. 4. The transmit RAI bit will be one until basic fram e alignment is established, then it will be zero. 5. E-bits can be optionally set to zero until the equipment interworking relationship is established. When this has been determined one of the following will take place: a) CRC-to-non-CRC operation - E-bits = 0, b) CRC-to-CRC operation - E-bits as per G.704 and I.431. 6. All manual re-frames and new basic frame alignment sear ches start after the current frame alignment signal position. 7. After basic frame alignment has been achieved, loss of frame alignment will occur any time three consecutive incorrect basic frame alignment signals are received. Loss of basic frame alignment will reset the complete framing algorithm. 8. When CRC-4 multiframe alignment has been achieved, the primary basic frame alignment and resulting multi- frame alignment will be adjusted to the basic frame alignment determined during CRC-4 synchronization. There- fore, the primary basic frame alignment will not be updated during the CRC-4 multiframe alignment search, but will be updated when the CRC-4 multiframe alignment search is complete.

Zarlink Semiconductor Inc. Figure 7 - Synchronization State Diagram (E1)

6.0 Elastic Buffer

The MT9072 has a two frame receive elastic (or slip) buffer, which absorbs wander and low frequency jitter in multi-trunk applications. If desired, the elastic buffer can be bypassed by using the Data Link RxDL pin output (see the following section). The received data (RPOS and RNEG) is clocked into the elastic buffer with the extracted (EXCLi pin) clock and is clocked out of the elastic buffer with the system (CKi pin) clock. The EXCLi clock is generated from the receive data, and is therefore phase-locked with that data. In normal operation, the EXCLi clock 400 msec timer expired >914 CRC errors in one second NO 3 consecutive incorrect frame alignment signals YES CRC-to-non-CRC interworking. Maintain primary basic frame alignment. Continue to send CRC-4 data, but stop CRC processing. E-bits set to ‘0’. Indicate CRC-to-non-CRC operation. Note 7. Search for primary basic frame alignment signal RAI=1, Es=0. Out of synchronization Verify Bit 2 of non-frame alignment signal. Parallel search for new basic frame alignment signal. Notes 6 & 7. YES YES NO CRC multiframe alignment * only if CRC-4 synchronization is selected and automatic CRC-4 interworking is de-selected. only if automatic CRC-4 interworking is selected. 8 msec. timer expired CRC-to-CRC interworking. Re-align to new basic frame alignment. Start CRC-4 processing. E-bits set as per G.704 and I.431. Indicate CRC synchronization achieved. Notes 7 & 8. signaling multi-frame alignment Primary basic frame synchronization acquired. Enable traffic RAI=0, E’s=0. Start loss of primary basic frame alignment checking. Notes 7 & 8. YES CRC-4 multi-frame alignment YES Verify second occurrence of frame alignment signal. Start 8 msec timer. Note 7. Multiframe synchronization acquired as per G.732. Note 7. Find two CRC frame alignment signals. Note 7. Check for two consecutive errored multiframe alignment signals. Notes 7 & 8. Start 400 msec timer. Note 7. Search for multiframe alignment signal. Note 7. NO NO NO YES Basic frame alignment acquired No CRC multiframe alignment. No CRC multiframe alignment. 8 msec. timer expired* RAI = 0

and write positions of the elastic buffer will remain fixed with respect to each other. trunks may wander with respect to the EXCLi clock of the synchronizer and the system bus. maximum of 26 channels (208 UI, unit intervals) of wander and low frequency jitter before a frame slip will occur. approximately 60 channels (see Figure 8). delay limits stated in the previous paragraph will be violated and the slip buffer will perform a controlled frame slip. RSLIPI (register address Y34 for E1 and Y36 for T1) is also provided. Table 14. The registers related to elastic buffer for E1 are shown in Table 15.

60 CH 2 CH

47 CH 15 CH

34 CH 28 CH

512 Bit

26 Channels

Zarlink Semiconductor Inc. In T1 mode, the transmit and receive elastic buffers al so serve the purpose of rate conversion between the 1.544 Mbit/s line rate and the 2.048 Mbit/s backplane rate. Consequently, in T1 mode the elastic buffers cannot be bypassed, except for the special case of T1 IMA mode. Register Address Register Description Y00 Framing Mode Select If IMA mode is selected the transmit and receive elastic buffers are bypassed. Y13 Receive Slip Buffer Status Word This register prov ides status bits for receive slip and its direction word that indicates the phase difference between the ST-BUS and the PCM24 Y14 Transmit Slip Buffer Status Word This register prov ides status bit for transmit slip and its direction word that indicates the phase difference between the ST-BUS and the PCM24. Y26 Elastic Store and Excessive Zero Status Latch This register indicates the latched version of the slip indicator bits from registers Y13 and Y14. Y36 Elastic Store and Excessive Zero Interrupt Status Interrupt status word for the slip indicators. Y46 Elastic Store and Excessive Zero Interrupt Mask Interrupt mask bits for the slip indicators. YF7 Transmit Set Delay Bits This register sets a one time delay through the transmit slip buffer. Table 14 - Registers Related to the Elastic Buffer (T1) Register Address Register Description Y00 Framing Mode Select If IMA mode is selected the receive elastic buffers are bypassed. Y03 DL,CCS,CAS and Other Control Register ELAS bit is used to bypass the elastic store, that data at DSTo is the received. PCM30 data after the HDB3 coding. Y10 Sync and CRC-4 Remote status RSLP and RSLPD show the slip and the direction of the slip. Y14 Phase Status Indicator This word reflects the delay through the receive elastic store from the line to the ST-BUS side. Y34 Sync,CRC-4 Remote, Alarm, MAS and Phase Status Word RSLIPI in this register reflects the interrupt due to a slip. Y44 Sync,CRC-4 Remote, Alarm, MAS and Phase Status Word Interrupt Mask Interrupt mask bits for the slip indicator. Table 15 - Registers Related to Elastic Store (E1)

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6.1 Transmit Elastic Buffer

In T1 mode, the MT9072 contains a transmit elastic buffer in addition to the receive elastic buffer. Data is clocked into the transmit elastic buffer by the 2.048 Mbit/s or 8.192 Mbit/s ST-BUS clock (which is subsequently divided to a 2.048 MHz clock). The data is clocked out of the transmit elastic buffer by the 1.544 MHz clock input to the TXCL pin. The delay through the transmit elastic buffer will vary in accordance with the posit ion of the channel in the frame. For example, PCM24 channel 1 sits in the elastic buffer for approximately 1 usec, and PCM24 channel 24 sits in the elastic buffer for approximately 32 usec. The relative phase delay between the system ST-BUS frame boundary and the transmit elastic frame read boundary is measured every frame and reported in the Transmit Slip Buffer Status Word (Y14). In addition, the relative delay between these frame boun daries may be programmed by writing to Tx Set Delay Bits (register addres s YF7). Every write to the TX Set Delay Bits resets the Transmit Slip Buffer MSB bit TxSBMSB (register address Y14). After a write, the delay through the slip buffer is less than 1 frame in duration. Each write operation will result in a disturbance of th e transmit PCM24 frame b oundary, causing the far end to go out of sync. The transmit elastic buffer is capable of performing controlled slips in a manner similar to the receive elastic buffer. Slips on the transmit side are independent of slips on t he receive side. The two status bits. TSLIP and TSLPD (register address Y14), give indication of a slip occurrence and direction. TSLP changes state in the event of a slip. If TSLPD=0, the slip buffer has overflowed and a frame was lost; if TSLPD=1, an underflow condition occurred and a frame was repeated. A maskable interrupt status bit T XSLIPI (register address Y36) is also provided. Under normal operation no slips should occur in the transmit path . Slips will only occur if the input CKi clock has excess wander relative to the input TXCL clock, or if the TX Set Delay Bits (register address YF7) register is initialized too close to the slip pointers after system initialization.

7.0 Data Link

7.1 T1 Data Link

The ESF protocol allows for carrier messages to be embedded in the S-bit posi tion. The MT9072 provides 3 separate means of controlling the Data Link.

Transmit and receive Data Link pins TxDL, TxDLC, RxDL and RxDLC.
Bit - Oriented Messages may be transmit and received via dedicated transmit and receive registers(Y07,Y08,Y12). This is only applicable in the ESF mode.
The ESF Data Link (DL) can be connected to an internal HDLC, operating at a bit rate of 4 kbits/sec. The HDLC can be activated by setting the control bit 1(HDL CEn) of the HDLC & Data Link Control Word (Y06). In the D4 mode the Fs bits can be inse rted/extracted from the Data Link pins by setting the EDLEN bit in Y06. The registers related to the Data Link are shown in Table 16.

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7.1.1 T1 Data Link (DL) Pin Access

When EDLEN(Y06) is set to "1" the data link (DL) bits can be sourced/sinked to and from the TxDL and RxDL pins, by enabling the corresponding pulses in either gapped clocks or enable low signals provided at the RxDLC and TxDLC pins. The option of either gapped clock or enable signal is selected by control bit DLCK (Register address Y06). In D4 or ESF mode, the optional serial data link operate s at 4 khz. In D4 mode the data link pins are used to send/receive Fs bits only, while the Ft bits are generated internally. See Figures 40 to 43.

7.1.1.1 T1 Data Link (DL) Pin Data Received from PCM24

The RxDLC clock is derived from the receive extrac ted clock (EXCLi).The B8ZS decoded receive data, at 1.544 Mbit/s, is clocked out of the device on the RxDL pin with the rising edge of EXCLi and is aligned to RXDLC. In order to facilitate the attachment of this data stream to a Data Link controller, the clock signal RxDLC (falling edge of EXCLi) consists of positive pulses, of nominal width of 344ns, during the Fs bit cell times that are selected for the Data Link, with the rising edge aligned with the middle of the bit cell. DL data will not be lost or r epeated when a receive frame slip occurs as the DL data does not pass th rough the elastic buffer. See Figures 42 to 43 for timing requirements.

7.1.1.2 T1 Data Link (DL) Pin Data Sent to PCM24

The TxDLC clock is derived from the transmit clock (T XCL) and is provided one frame before its usage on the appropriate S-bit. Hence the TXDLC clock is provided one frame before it is used in ESF Mode in Frames 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24. See Figures 40 to 41 for timing requirements. Register Address Register Description Y06 HDLC and Data Link Control Register This register determines the source of the Data Link which can be the HDLC, Bit Oriented messages or the external Data Link. This register also controls the type of clocks provided to the external Data Link interface. Y07 Transmit bit Oriented Message This register holds the message that will be sent in ESF FDL if the BOMEN bit in Y06 is set. Y08 Receive bit Oriented Message Match This register is the match register for received bit oriented message Y12 Receive bit Oriented Message This register hol ds the value of the receive bit oriented message Y25 Receive Line Status and Timer Latch This register contains bit oriented message and bit oriented message match latch bits. Y35 Receive Line and Timer Interrupt Status This register contains bit oriented message and bit oriented message match interrupt status bits. Y45 Receive Line and Timer Interrupt Mask These are the mask bits for Y35. Table 16 - Registers Related to the Data Link and Bit Oriented Messages (T1)

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7.2 E1 Data Link (DL) Operation

Table 12 shows the contents of the transmit and receive Frame Alignment Signals (FAS) and Non-frame Alignment Signals (NFAS) of timeslot zero of a PCM30 signal. Even numbered frames (CRC Frame # 0, 2, 4,...) are FASs and odd numbered frames (CRC Frame # 1, 3, 5,...) are NFASs. The bits of each channel are numbered 1 to 8, with bit 1 being the most significant and bit 8 the least significant. The Data Link (DL) bits, also referred to as National bits, are the Sa4, Sa5, Sa6, Sa7 and Sa8 bits of the PCM30 timeslot zero NFAS frames. Any number and combination of these bits may be used for the transport of maint enance and performance monitoring information across the PCM30 link. The DataLink in controlled by the address Y06 and Y08. The received Data Link bits are always sent to the DataLink Pins and the National bit buffers(YC0-YC4). The Data Link (DL) bits (Sa4~Sa8) of the PCM30 timeslot zero NFAS frames can be accessed by the MT9072 in the following four ways:

External serial port pins. Hence the user can use pins (TxDL and TxDLC) for transmit data link access and RxDL and RXDLC for receive data link access
Micro port access which would use Transmit 5 bit regist er (TNU4-8 address YB0 to YB4). For the receiver Receive 5 bit register (RNU4-8 address YC0-YC4).
ST-BUS access Transmit ST-BUS (DSTi timeslot 0) enabled by transparent mode
On board HDLC for Timeslot 0 Note: that the user can source different Sa bits fr om a combination of the above 4 methods. For instance the Sa 4 bit could be sourced from the External Serial Port and Sa5 to Sa8 from the micro port register (TNU5-8 address YB1 to YB4). The registers related to the configuration control and status of the data link are shown in Table 17. Register Address Register Description Y00 Alarm and Framing Control Register The Data Link is not supported in the IMA mode. Y06 HDLC and CCS ST-BUS control register The bit HPSEL has to be 0 if the internal HDLC is to be used for the Data Link. Y08 Data Link Control Register This register determines the source of the Sa bits which can be micro port,HDLC, data link pins or ST-BUS. This register is also used to control the data link pins Txdl and Rxdl. Y13 NFAS and FAS status The national use bits RNU can be read from this status register. Y26 CAS, National, CRC-4 Latched Status The Sa bit latched values can be read from this register, SA5VL, SA6NL etc. Y36 CAS, National, CRC-4 Interrupt Status The Sa bit interrupt values can be read from this register, SA5VI, SA6NI etc. Y46 CAS, National, CRC-4 Interrupt Mask These are the mask bits for Y36. YB0-YB4 Transmit National Bits Transmi t national bits used for sending Sa bits(SA4 to SA8). YC0-YC4 Receive national bit Receive National bits(SA4 to SA8) Table 17 - Data Link and Sa Bits Configuration and Status Registers (E1)

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7.2.1 E1 Data Link (DL) Pin Access

The pin (TxDL, TxDLC, RxDL and RxDLC) enable bits Sa4SS to Sa8SS of control register address Y08 determine the type of data link access enabled. A ’01’ code enables the corresponding data link (DL) bits to be sourced to and from the RxDL and TxDL pins, by enabling the correspondi ng pulses in either gapped clocks or enable low signals provided at the RxDLC and TxDLC pins. The option of either gapped clock or enable signal is selected by control bit DLCK (register address Y08). The data link bits are transmitted on and received from the PCM30 link, in the national bit (Sa4 to Sa8) positions (four to eight of timeslot zero) of the Non-Frame Alignment Signal (NFAS) frames. The gapped clock rate w ill be either 4, 8, 12, 16 or 20 kb/s, and w ill depend on the nu mber of Sa bits enabled by SA#SS bits (register Y08). Similarly the enable pulse width(s) will also depend on the number of Sa bits enabled.

7.2.1.1 E1 Data Link (DL) Pin Data Transmitted on PCM30

Data to be transmitted onto the line in the S a bit position is clocked in from the TxDL pin with the TxDLC clock. Although the aggregate clock rate equals the bit rate, it has a nominal pulse width of 244 ns, and it clocks in the TxDL as if it were a 2.048 Mbit/s data stream. The clock c an only be active during bit times 4 to 0 of the ST-BUS frame. The TxDL input signal is clocked into the MT9072 by the falling edge of TxDLC which occurs about 3/4 into the ST-BUS bit cell. If DL bits are selected to be accessed through the DL pins, then all other programmed functions for those Sa bit positions are overridden. See Figures 59 & 60 for timing requirements.

7.2.1.2 E1 Data Link (DL) Pin Data Received on PCM30 - With No Elastic Buffer

The RxDLC clock and enable signal is derived from the re ceive extracted clock (EXCLi) and is aligned with the receive data link output RxDL. The HDB3 decoded receive data, at 2.048 Mbit/s, is clocked out of the device on the RxDL pin with the falling edge of EXCLi. In order to facilitat e the attachment of this data stream to a Data Link controller, the clock signal RxDLC consists of positive pulses, of nominal width of 244 ns, during the S a bit cell times that are selected for the data link, with the rising edge aligned with the middle of the bit cell. No DL data will be lost or repeated when a receive frame slip occurs as the DL data does not pass through the elastic buffer. The output signal at the RxDLC pin may be either a clock or an enable signal as programmed by the DLCK control bit (register address Y08). See Figures 62 & 63 for timing requirements.

7.2.1.3 E1 Data Link (DL) Pin Data Received on PCM30 - With Elastic Buffer

In this case, the TxDLC pin is used for both DL data transmitted on the PCM30 link and DL data received on the PCM30 link. However, instead of using the non-buffered data output at the RxDL pin, the buffered DSTo output data is used. The clock at the TxDLC pin cloc ks data from the DSTo ST-BUS stream into an external controller, or the enable signal at the TxDLC pin enables a 2.048 Mbit/s clock which clocks data from the DSTo ST-BUS stream into an external controller. Since a common clock is used for both transmit and receive, a simpler data controller may be used such as the MT8952B. However, DL data will be lost or repeated when a receive frame slip occurs, as the DL data does pass through the elastic buffer. See Figures 59 - 60 for timing requirements.

7.2.2 E1 Data Link (DL) National Bit Buffer Access

When the National Bit Buffer transmit data registers access is enabled, the setti ngs of 40 data bits in 5 registers (address YB0-YB4) determine the Data Link (DL) output on the PCM30 link corresponding to bit positions Sa4-8 over one complete CRC-4 Multiframe . The CRC-4 alignment status bit CA LN (register address Y11) and corresponding maskable interrupt status bit CALNI (register address Y36) indicate the beginning of every received CRC-4 multiframe. Data for DL transmission should be wr itten to the National Bit Buff er transmit data registers immediately following the CALN status indication (during basic frame 0) and before the start of basic frame 1. Table 18 illustrates the organization of the MT9072 transmit and receive national bit buffers. Each row is an addressable byte of the MT9072 national bit buffer, and each column contains the national bits of an odd numbered frame of each CRC-4 Multiframe. The transmit and receive national bit buffers are located at addresses YB0 to YB4 and YC0 to YC4 respectively.

Zarlink Semiconductor Inc. For the National Bit Buffer transmit registers DL access to be enabled the SA4SS to SA8SS(register Y08) are set to 00. Similarly, the DL data received on the PCM30 link is output to the National Bit Buffer receive data registers (register address YC0-YC4), corresponding to bit positions as shown in Table 18. However, the National Bit Buffer receive data registers are always enabled, regardless of the above control bit settings(SA4SS to SA8SS). Received DL Data should be read from the National Bit Buffer rece ive data registers immediately following the CALN status indication (during basic frame 0) and before the start of basic frame 1. In order to facilitate conformance to ETS 300 233, three maskable interrupts are available for change of state of Sa bits in the receive National Bit Buffer. These include Eight Consecutive Sa6 Nibbles (Sa6N8), Sa6 Nibble Change (Sa6N) and Sa Nibble Change (SaN). See the detailed descr iptions for these status bits provided in the CAS, National, CRC-4 Local and Timer Interrupt Status Register (address Y36).

7.2.3 E1 Data Link (DL) ST-BUS Access

When the ST-BUS Data Link (DL) access is enabled, the setting of the 8 ST-BUS DSTi data bits determine the Data Link (DL) output on the PCM30 link corresponding to bi t positions one to three an d Sa4-8 over each Non-Frame Alignment Signal (NFAS) frame. Data for DL transmission should be writt en to DSTi immediately following the NFAS frame (during FAS frames) and before the start of the next NFAS frame. The ST-BUS Data Link (DL) access is enabled if the Sa Source Select Bits (Sa4SS-SA8SS) are set to ’10’ in register Y08. ST-BUS DSTi timeslot 0 bits will be transmitted as NFAS bits on the PCM30 link, as shown in Table 19 (bit positions one to eight of timeslot zero, of odd CRC-4 frames 1, 3, 5, 7, 9, 11, 13, 15). The DL data received on the PCM30 link is always out put to ST-BUS DSTo timeslot 0 during NFAS frames, regardless of the settings of SA4SS to SA8SS. Addressable Bytes NFAS Frames of a CRC-4 Multiframe Transmit Address Receive Address F1 F11 F13 F15 TN0 YB0 RN0 YC0 Sa4 Sa4 Sa4 Sa4 Sa4 Sa4 Sa4 Sa4 TN1 YB1 RN1 YC1 Sa5 Sa5 Sa5 Sa5 Sa5 Sa5 Sa5 Sa5 TN2 YB2 RN2 YC2 Sa6 Sa6 Sa6 Sa6 Sa6 Sa6 Sa6 Sa6 TN3 YB3 RN3 YC3 Sa7 Sa7 Sa7 Sa7 Sa7 Sa7 Sa7 Sa7 TN4 YB4 RN4 YC4 Sa8 Sa8 Sa8 Sa8 Sa8 Sa8 Sa8 Sa8 Table 18 - MT9072 National Bit Buffers (E1)

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7.2.4 E1 Timeslot 0 CRC-4 NFAS Receive from PCM30 to DSTo

Non-Frame Alignment Signal (NFAS) bits on the receive PCM30 link (bit positions one to eight of timeslot 0 of odd CRC-4 frames 1, 3, 5, 7, 9, 11, 13, 15) are sourced to the ST-BUS DSTo stream.The data to DSTo is mapped unaltered from the receive PCM30 link as shown in Table 20.

7.3 T1 Bit Oriented Message

Bit Oriented Messages can be sent on the FDL in ESF mode. Bit - Oriented Messages may be transmitted via the Tx BOM register (Y07) and received in the RxBOM (Y12). Transmission is enabled by setting bit 2 - BOMEn in the HDLC &Data link Control Word(Y06). Bit - oriented messages may be periodically interrupted (up to once per second) for a duration of up to 100 milliseconds. This is to accommodate bursts of message - oriented protocol s. Table 21 shows the messages that can be sent and received according to T1.403. The transmit data link will contain the repeating serial data stream 111111110xxxxxx0 where the byte 0xxxxxx0 originates from the user programmed register “Transmit Bit Oriented Message” - Y07. The receive BOM register “Receive Bit Or iented Message” - Y12, will contain the last received valid message (the 0xxxxxx0 portion of the incoming serial bit stream). To prevent spurious inputs from creating false messages, a new message must be present in 8 of the la st 10 appropriate byte positions befo re being loaded into the receive BOM register. When a new message has been received, a maskable interrupt (maskable by setting bit 4 low in Receive Line status and Timer Mask (Y45) may occur. Bit oriented messages are only applicable in the ESF mode. A Bit oriented match register is available RXBOMM(Y08) and a maskable interrupt can be generated when the received Bit Oriented Message matches the contents of RXBOMM; the mask can be enabled by writing a ‘0’ to bit 3 of the Receive Line and Timer Interrupt Mask Register (Y45). ST-BUS DSTi PCM30 Transmit CRC-4 Frame Timeslot Data Bits (B7-B0) Timeslot CRC-4 Frame Data Bits (B1-B8) All NFAS n P1, P2, P3, Sa4, Sa5, Sa6, Sa7, Sa8

0 All NFAS P1, P2, P3, Sa4, Sa5, Sa6,

Sa7, Sa8 Note 1. For 2.048 Mbit/s operation, n=0. Note 3. To source the NFAS, Sa bits from DSTi, ST-BUS mode access must be enabled (SA4SS to SA8SS = 10 register address Y08. Table 19 - Transmit PCM30 National Bits from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s DSTi (E1) ST-BUS DSTo PCM30 Receive CRC-4 Frame Timeslot Data Bits (B7-B0) Timeslot CRC-4 Frame Data Bits (B1-B8) All NFAS n P1, P2, P3, Sa4, Sa5, Sa6, Sa7, Sa8 Sa7, Sa8 Note 1. For 2.048 Mbit/s operation, n=0. Note 3. For these functions to be valid, NFAS DSTi ST-BUS mode access must be enabled (SA4SS to SA8SS register address Y08). Note 4. For these functions to be valid, the Timeslot Control Registers must be disabled (all bits=0 register address Y90-YAF). Table 20 - Receive PCM30 National Bits to ST-BUS 2.048 Mbit/s or 8.192 Mbit/s DSTo (E1)

Zarlink Semiconductor Inc. Note: ADDRESS INTERPRETATION

00111000 SAPI = 14, C/R = 0 (CI) EA = 0

00111010 SAPI = 14, C/R = 1(Carrier) EA = 0

00000001 TEI = 0, EA =1

00000011 Unacknowledged Information Transfer

ONE SECOND REPORT INTERPRETATION G1 = 1 CRC Error Event =1 G2 =1 1 < CRC Error Event < 5 G3 =1 5 < CRC Error Event < 10 G4 =1 10 < CRC Error Event < 100 G5 =1 100 < CRC Error Event < 319 G6 =1 CRC Error Event > 320 SE = 1 Severely - Errored Framing Event >=1 FE = 1 Frame Synchronization Bit Error Event >=1 LV = 1 Line code Violation Event >=1 SL = 1 Slip Event >=1 LB = 1 Payload Loopback Activated U1,U2 = 0 Under Study for sync. R = 0 Reserved - set to 0 NmNI = 00, 01, 10, 11 One Second Module 4 counter FCS INTERPRETATION VARIABLE CRC16 Frame Check Sequence O c t e t # 87654321 O c t e t C o n t e n t

1 F L A G 01111110

2SAP I C / R E A 0 0 1 1 1 0 0 0 or 00111010

3 T E I EA 00000001

4 C O N T R O L 00000011

5 G 3L VG 4U 1U 2G 5S LG 6 t 0

6 F ES EL BG 1 R G 2 N mN I t 0

7 G 3L VG 4U 1U 2G 5S LG 6 t 0 - 1

8 F ES EL BG 1 R G 2 N mN I t 0 - 1

9 G 3L VG 4U 1U 2G 5S LG 6 t 0 - 2

10 FE SE LB G1 R G2 Nm NI t0-2

11 G3 LV G4 U1 U2 G5 SL G6 t0-3

12 FE SE LB G1 R G2 Nm NI t0-3

13 F C S Frame Check

14 Sequence

Table 21 - T1.403 and T1.408 Message Oriented Performance Report Structure (T1)

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8.0 Signaling

8.1 T1 Signaling

8.1.1 T1 Ro bbed Bit Signaling

When global control bit RBEn (Y04, Bit 8) is high the MT9072 will insert ABCD or AB signaling bits into bit 8 of every transmit DS0 every 6th frame if the corresponding per channel Clear C hannel bit(CC) is turned off. For the transmitter Robbed bit signaling can be turned off on a per channel basis by setting CC bit in per timeslot control register(Y90-YAF). The AB or ABCD signaling bits from received frames 6 and 12 (AB) or from frames 6, 12, 18 and 24 (ABCD) will be loaded into an internal storage RAM. The transmit AB/ ABCD signaling nibbles can be set either via the microport or through relat ed channels of the CSTi serial links, see ST-BUS vs. PCM24 Channel Relationship in Tables 1 to 2. If the MPST bit is set in the Per Timeslot Control register(Y90-YAF), the transmit signaling is sourced from the micropor t and not updated from the CSTi channel. If the MPST bit is not set, any values written to the transmit signaling memory will be overwritten by the CSTi stream. The receive signaling bits are stored in an internal RAM. These bits can be sourced to the CSTo streams. The serial control streams that contai n the transmit / receive signaling information (CSTi and CSTo respectively) can be clocked at 2.048 MHz, or 8.192 MHz (global control0 regi ster 900). In the case of 8.192 MHz the signaling from framers 0 to 3 are sent and received by CSTi0/CSTo0 and framer 4 to 7 are sent and received on CSTi4/CSTo4. The selection of the CSTi/CSTo interface is done by the number of signaling channels to be transmitted / received = 24 (timeslots) x 4 bits per timeslot (ABCD) = 24 ni bbles. This leaves many unused nibble positions in the 2.048 MHz CSTi / CSTo bandwidth. These unused nibble locations are tristated. The usage of the bit stream is as follows: the signaling bits are inserted / reported in the same CSTi / CSTo channels that correspond to the DS1 channels used in DSTi / DSTo - see Table 1 to 2. The ABCD are in the least significant nibble of each channel. Unused nibbles and timeslots are tris tate. In order to facilitate multip lexing on the CSTo control stream, an additional control bit CSToEn (bit 1 of the interrupt and IO Control Word YF1) will tristate the whole stream when set low. This control bit is forced low when the reset pin is asserted. In the case of D4 trunks, only AB bits are reported. The control bits SM1-0(Register Y04) allow the user to program the 2 unused bits reported on CSTo in the signaling nibble(for D4 Mode) otherwise occupied by CD signaling bits in ESF trunks. A receive signaling bit debounce of 6 msec can be selected (RSDB set high - bit 6 of the signaling Control Word Y04) for all T1 Modes. If multiframe synchronization is lost (Synchroni zation and Alarm Status Word(Y10) Bit 12, MFSYNC = 1), the receive signaling bits are frozen. They will become unfrozen when multi - frame synchronization is acquired (this is the same as terminal frame synchronization for ESF links). When the CASRI interrupt is unmasked, IRQ will become active when a signaling state change is detected in any of the 24 receive channels and a selectable 1 msec, 4 msec or 8 msec timer (Y04 bit 0,1) has expired. This function helps to reduce the frequency of in terrupts generated due to signaling cha nges. For instance if 7 channels had a signaling change only one interrupt will be generated in a 2, 8, or 16 msec duration. Upon an interrupt the user has to read the CAS registers (Y70 to Y87)t o determine th e channels with a signaling change.The CASRIM interrupt mask is located in register Y45 bit 2 (reset low to enable interrupt); and the CASRI interrupt status bit in register is Y35 bit 2. Any channels marked as clear channels will not generate an interrupt due to changes in ABCD bits. When bit 0 (CC) in the per timeslot control word (Y90 to YA7) is set no bit robbing fo r the purpose of signaling will occur in this channel and no signaling ch ange interrupts will be generated by the channel. When bit 7 (MPST) is set, the transmit signaling for the ad dressed channel can only be programmed by writing to the transmit signaling page (Y50 to Y67) via the microport. If MPST is zero, the transmit signaling information is constantly updated with the information from the equivalent channel on CSTi.

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8.1.2 T1 Commo n Channel Signaling

One 64 Kbit/s channel can be mapped from/to an exter nal multichannel HDLC using the CSTi/0 pins. This is accomplished by writing to register Y0B and Y04(CSIGEN bit). Note that only channels 0 to 23 can be used on the CSTi/o streams in Common Channel Signaling applications. For the CSTo stream only the channel that is selected is driven, the rest of the stream is tristate. In 8 Mbit/s mode up to 4 channels per 8 Mbit/s CSTi/0 stream will be assigned to the external HDLC in accordance with Table 2.

8.2 E1 Signaling

8.2.1 Channel Associated Signaling (CAS) Operation

The purpose of the CAS signaling Multiframing algorithm is to provide a scheme that will allow the association of a specific ABCD signaling nibble with the appropriate PCM30 channel. The si gnaling nibble when sinked or sourced from the ST-BUS will have the ABCD bits being bits 3 to 0 respectively. A CAS signaling multiframe consists of 16 basic frames (numbered 0 to 15), which results in a multiframe repetition rate of 2 msec. It should be noted that the boundaries of the sign aling multiframe may be completely distinct from those of the CRC-4 multiframe. CAS multiframe alignment is based on a multiframe alignment signal (a 0000 bit sequence), which occurs in the most significant nibble of timeslot 16 of basic frame 0 of the CAS multiframe. Bits 5, 7 and 8 (usually designated X) are spare bits and are normally set to one if not used. Bit 6 of this timeslot is the multiframe alarm bit (usually designated Y). When CAS mult iframing is acquired on the receive side, the transmit Register Address Register Description 900 Global Control 0 CK1 determines an 8 Mhz stream or a 2 Mhz stream. STBUS selects a GCI or ST-BUS CSTi, CSTo streams. Y00 Framing Mode Select The number of signaling bi ts available is dependent on the mode. For D4 and T1DM 2 bits of signaling, for ESF 4 bits. In G.802 and IMA mode signaling is not supported. Y04 Signaling Control Word This register defines the selection between robbed bit or common channel, signaling debounce and substitute bits C,D bits for D4 mode on CSTo. Y04 bit 0 and 1 are used to control the frequency of the signaling change interrupt. Y0B Common Channel signaling Map Register This register is used to determine the CSTi/o channel to PCM24 timeslot mapping for common channel signaling. Y10 Synchronization and Alarm Status Word The receive signaling will not work if terminal frame synchronization and multiframe synchronization is not achieved. Y50-Y60 Per Channel Transmit signaling The clear channel bit can be used to block insertion of signaling in the transmit direction. The MPST bit can be used to determine the source of the transmit signaling, which is either the CSTi stream or the transmit signaling ram. Y35 Receive Line and Timer Interrupt Status The CASRI bit is set if unmasked and receive signaling changes on any channel. The channels marked as clear channel do not generate an interrupt. Y45 Receive Line and Timer Interrupt Mask CASRIM is the mask bit for the Y35. Table 22 - Registers Related to Signaling (T1)

Zarlink Semiconductor Inc. Y-bit is zero; when CAS multiframing is not acquired, the tr ansmit Y-bit is one. Refer to ITU-T G.704 and G.732 for more details on CAS multiframing requirements. Register s related to configuration and observation of the CAS signaling are shown in Table 23. Timeslot 16 of the remaining 15 basic frames of the CAS mult iframe (i.e., basic frames 1 to 15) is reserved for the ABCD signaling bits for the 30 payload channels. The most significant nibbles are reserved for channels 1 to 15 and the least significant nibbles are reserved for channels 16 to 30. That is, timeslot 16 of basic frame 1 has ABCD for channel 1 and 16, timeslot 16 of basic frame 2 has ABCD fo r channel 2 and 17, through to timeslot 16 of basic frame 15 has ABCD for channel 15 and 30. See Table 24. No te that the ABCD bits for TS1 to TS15 should not be 0000 to prevent mimic of the multiframe alignment signal(0000). Register Address Register Description 900 Global Control 0 CK1 determines an 8.192 Mbits stream or a 2.048 Mbits stream. STBUS selects a GCI or ST-BUS CSTi, CSTo streams. Y00 Alarm and Framing Control Register Ensure that TAIS16 is off, the signaling information in CAS cannot be sent if TAIS16 is on. Also signaling is not supported in IMA mode. Y02 Interrupt and IO Control Register If CSTo is to contain the signaling nibbles set CSTOE to 1 and RXCO to Y03 DL,CCS,CAS and other Control Register RXTRS which sets the receiver in a transparent mode has to be turned off. Y04 Signaling Interrupt Period Register Bit 0 and 1 of this register determine the period of the interrupt CASRI. The period is selectable from 2 msec 8 msec and 16 msec. Y05 CAS Control and Data Register If RFL is set the receive signaling is frozen due to synchronization loss. If debounce is selected a 14 msec debounce is applied before the signaling is available in the csto or receive CAS register. Y06 HDLC and CCS ST-BUS Control Register TS31E, TS15E and TS16E have to be off since Common Channel signaling and CAS are mutually exclusive. Y10 Synchronization and CRC-4 Remote Status. MSYNC has to be low for the signaling in the Receive CAS Registers or CSTO has valid data. Y26 CAS, National, CRC-4 Local and Timer Latch Status The bit CASRL reflects the signaling changes on the receive CAS. Y36 CAS, national, CRC-4 Local and Timer Interrupt Status The CASRI will be set if a signaling Interrupt has occurred. The period of the interrupt is controlled by the signaling Interrupt Period Register(Y04). Y46 National Interrupt Mask Register The bit CASRM can be used to mask interrupts from the receive signaling changes. Y51-Y6F Per Channel Transmit Signaling The clear channel bit can be used to block insertion of signaling in the transmit direction. The CASS bit can be used to determine the source of the transmit signaling, which is either the CSTi or the transmit signaling ram. Y90 to YAF Per Channel Timeslot Control Register The CASS bit determines the source of the transmit signaling which is either the ST-BUS or the transmit signaling registers(Y51 to Y60). Table 23 - Registers Related to CAS Signaling (E1)

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8.2.2 E1 Channel Associated Signaling (CAS) Register and ST-BUS Access

The CSIG control bit (register address Y03) must be set to zero for Channel Associated signaling (CAS) operation. Access to the ABCD transmit and receive bits may be either through ST-BUS channels 1 to 15 and channels 17 to 31 at the CSTi and CSTo pins, or through the Trans mit CAS Data registers (Y51-Y6F) and Receive CAS Data registers (Y71-Y8F) accessed by the parallel processor port, or through a mix of both methods. The timeslot control register bits (CASS(n) address Y90-YA F) determine the source of the CA S data on a per channel basis. A zero enables an ST-BUS source and a one enables a register source. Note that when changing the CASS(n) control bits from ST-BUS source to register source on the fly (dur ing normal operation as opposed to during power up), the data in the Transmit CAS Data registers (Y51-Y6F) should be updated one frame after the timeslot control register bits (CASS(n)) are changed. This is becaus e the timeslot control r egister bits do not take effect immediately. Both destinations of CAS data are always enabled (i.e., ST-B US CSTo and receive data registers). ST-BUS CSTi and CSTo channels 0 and 16 are not used. When the CASRI interrupt is unmasked, IRQ will become active when a signaling state change is detected in any of the 30 receive channels and a selectable 2 msec, 8 msec or 16 msec timer(Y04 bit 0,1) has expired. This function helps to reduce the frequency of in terrupts generated due to signaling cha nges. For instance if 7 channels had a signaling change only one interrupt will be generated in a 2, 8 or 16 msec duration. Upon an interrupt the user has to read the CAS registers (Y70 to Y8F) to determine the channels with a signaling change.The CASRIM interrupt CAS Frame PCM30 Timeslot 16 1234 5678 Channel Associated signaling (CAS) Multiframe (not related to CRC-4 multiframing) MAS - Multiframe Alignment Signal NMAS - Non-multiframe Alignment Signal X - Spare Bit = 1 if not used Y - Remote Multiframe Alarm Signal 0 0000 (MAS) XYXX (NMAS)

1 ABCD (ch 1 = ts1) ABCD (ch 16 = ts 17)

2 ABCD (ch 2 = ts 2) ABCD (ch 17 = ts 18)

3 ABCD (ch 3 = ts 3) ABCD (ch 18 = ts 19)

4 ABCD (ch 4 = ts 4) ABCD (ch 19 = ts 20)

5 ABCD (ch 5 = ts 5) ABCD (ch 20 = ts 21)

6 ABCD (ch 6 = ts 6) ABCD (ch 21 = ts 22)

7 ABCD (ch 7 = ts 7) ABCD (ch 22 = ts 23)

8 ABCD (ch 8 = ts 8) ABCD (ch 23 = ts 24)

9 ABCD (ch 9 = ts 9) ABCD (ch 24 = ts 25)

10 ABCD (ch 10 = ts 10) ABCD (ch 25 = ts 26)

11 ABCD (ch 11 = ts 11) ABCD (ch 26 = ts 27)

12 ABCD (ch 12 = ts 12) ABCD (ch 27 = ts 28)

13 ABCD (ch 13 = ts 13) ABCD (ch 28 = ts 29)

14 ABCD (ch 14 = ts 14) ABCD (ch 29 = ts 30)

15 ABCD (ch 15 = ts 15) ABCD (ch 30 = ts 31)

Table 24 - Channel Associated Signaling (CAS) Multiframe Structure (E1)

Zarlink Semiconductor Inc. mask is located in register Y46 bit 4 (clear to enable interr upt); and the CASRI interrupt status bit in register is Y36 bit 4. Any channels marked as clear channels will not generate an interrupt due to changes in ABCD bits.

8.2.2.1 E1 Channel Associated Signaling (CAS) Transmit from ST-BUS CSTi to PCM30

Table 25 shows the detailed bit mapping of CSTi timeslots to transmit PCM30 frames.

8.2.2.2 E1 Channel Associated Signaling (CAS) Receive from PCM30 to ST-BUS CSTo

Table 26 shows the detailed bit mapping of CSTo timeslots from receive PCM30 frames. Frame ST-BUS CSTi PCM30 Transmit Timeslot Data Bits (B7-B0) Timeslot Data Bits (B1-B8) 0 0 + n not used. 16 CAS Multiframe Alignment Signal 1m + n to 15m + n 16m + n not used. 17m + n to 31m + n 1 to 15 as above as above 16 A1, B1, C1, D1, A16, B16, C16, D16 to A15, B15, C15, D15, A30, B30, C30, D30 Note 1. For 2.048 Mbit/s operation, m=1 and n=0. Note 3. The number following the ABCD signaling bit letter designates the channel number (i.e., A30 designates channel 30). Note 4. For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03), and the required ST-BUS channels must be enab led (CASS=0 of register address Y90-YAF). Note 5. # indicates data which is not transmitted. Table 25 - Transmit PCM30 CAS Channels 1 to 30 from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s CSTi (E1) CAS Frame ST-BUS CSTo PCM30 Receive Timeslot Data Bits (B7-B0) Timeslot Data Bits (B1-B8) 0 0 + n not used. 16 CAS Multiframe Alignment Signal 1m + n to 15m + n 16m + n not used. 17m + n to 31m + n 1 to 15 as above as above 16 A1, B1, C1, D1, A16, B16, C16, D16 to A15, B15, C15, D15, A30, B30, C30, D30 Note 1. For 2.048 Mbit/s operation, m=1 and n=0. 3). Note 3. The number following the ABCD signaling bit letter designates the channel number (i.e., A30 designates channel 30). Note 4. For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03). Note 5. “1” indicates bit positions in a logic high state. Table 26 - Receive PCM30 CAS Channels 1 to 30 to ST-BUS 2.048 Mbits or 8.192 Mbits CSTo (E1)

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8.2.3 E1 Common Channel Signaling (CCS) Transmit from ST-BUS CSTi and DSTi to PCM30

The CSIG control bit (regi ster address Y03) must be set to one for Common Channel signaling (CCS) operation. CCS on the transmit PCM30 link (bit positions one to ei ght of timeslots 15, 16 and/or 31 of every frame) may be sourced from the ST-BUS DSTi stream or from the ST-BUS CSTi stream. If the TS15E, TS16E & TS31E control bits (register address Y06) are zero, the tran smit data will be sourced from the ST-BUS DSTi stream timeslots 15, 16 and 31, if these bits are one, then t he signaling data will be sourced from the ST-BUS CSTi stream. Note that any combination of the TS15E, TS16E & TS31E control bits (register address Y06) may be enabled. The CSTi source timeslots for the PCM30 timeslot 15, 16 and 31, are determined respectively by the 15C4-15C0, 16C4-31C0 and 31C4-31C0 (register address Y07) programming bits. Table 27 shows the detailed bit mapping of CSTi timeslots to transmit PCM30 frames. Table 28 shows the detailed bit mapping of DSTi timeslots to transmit PCM30 frames. ST-BUS CSTi PCM30 Transmit CRC-4 Frame Timeslot Data Bits (B7-B0) Timeslot CRC-4 Frame Data Bits (B1-B8) all Any one of 32 n + m(0 to 31) P1, P2, P3, P4, P5, P6, P7, P8 15 all P1, P2, P3, P4, P5, P6, P7, P8 all Any one of 32 n + m(0 to 31) P1, P2, P3, P4, P5, P6, P7, P8 16 all P1, P2, P3, P4, P5, P6, P7, P8 all Any one of 32 n + m(0 to 31) P1, P2, P3, P4, P5, P6, P7, P8 31 all P1, P2, P3, P4, P5, P6, P7, P8 Note 1. For 2.048 Mbit/s operation, m=1 and n=0. Note 3. For these functions to be valid, CCS mode must be selected (CSIG=1 register address Y03) and CSTi ST-BUS mode must be selected (TS15E=1, TS16E=1 & TS31E=1 register address Y06) and the preferred source CSTi timeslot should be selected (15C4-0, 16C4-0 & 31C4-0 register address Y07). Table 27 - Transmit PCM30 CCS from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s CSTi (E1) ST-BUS DSTi PCM30 Transmit CRC-4 Frame Timeslot Data Bits (B7-B0) Timeslot CRC-4 Frame Data Bits (B1-B8) all n + m(15) P1, P2, P3, P4, P5, P6, P7, P8 15 all P1, P2, P3, P4, P5, P6, P7, P8 all n + m(16) P1, P2, P3, P4, P5, P6, P7, P8 16 all P1, P2, P3, P4, P5, P6, P7, P8 all n + m(31) P1, P2, P3, P4, P5, P6, P7, P8 31 all P1, P2, P3, P4, P5, P6, P7, P8 Note 1. For 2.048 Mbit/s operation, m=1 and n=0. Note 3. For these functions to be valid, CCS mode must be selected (CSIG=1 register address Y03), and DSTi ST-BUS mode must be selected (TS15E=0, TS16E=0 & TS31E=0 register address Y06). Table 28 - Transmit PCM30 CCS from ST-BUS 2.048 Mbit/s or 8.192 Mbit/s DSTi (E1)

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8.2.4 E1 Common Channel Signaling (CCS) Receive from PCM30 to CSTo and DSTo

The CSIG control bit (regi ster address Y03) must be set to one for Common Channel signaling (CCS) operation. CCS on the receive PCM30 link (bit positions one to eight of timeslots 15, 16 and/or 31 of every frame) is sourced to the ST-BUS DSTo stream and may also be sourced to the ST-BUS CSTo stream. If the TS15E, TS16E & TS31E control bits (register addre ss Y06) are zero, the receive data will be sourced to the ST-BUS DSTo stream only, timeslots 15, 16 and 31. If these bits are one, then the sign aling data will be sourced to both the DSTo stream and the ST-BUS CSTo stream. Note that any combination of the TS15E, TS16E & TS31E control bits (register address Y06) may be enabled. The CSTo destination timeslots for the receive PCM30 timeslots 15, 16 and 31, are determined respectively by the 15C4-15C0, 16C4-31C 0 and 31C4-31C0 (register address Y07) programming bits. Table 29 shows the detailed bit mapping of CSTo timeslots from receive PCM30 frames. Table 30 shows the detailed bit mapping of DSTo timeslots from receive PCM30 frames. ST-BUS CSTo PCM30 Receive CRC-4 Frame Timeslot Data Bits (B7-B0) Timeslot CRC-4 Frame Data Bits (B1-B8) all Any one of 32 n + m(0 to 31) P1, P2, P3, P4, P5, P6, P7, P8 15 all P1, P2, P3, P4, P5, P6, P7, P8 all Any one of 32 n + m(0 to 31) P1, P2, P3, P4, P5, P6, P7, P8 16 all P1, P2, P3, P4, P5, P6, P7, P8 all Any one of 32 n + m(0 to 31) P1, P2, P3, P4, P5, P6, P7, P8 31 all P1, P2, P3, P4, P5, P6, P7, P8 Note 1. For 2.048 Mbit/s operation, m=1 and n=0. Note 3. For these functions to be valid, CCS mode must be selected (CSIG=1 register address Y03) and CSTo ST-BUS mode must be selected (TS15E=1, TS16E=1 & TS31E=1 register address Y06) and the preferred destination CSTo timeslot should be selected (15C4-0, 16C4-0 & 31C4-0 register address Y07). Table 29 - Receive PCM30 CCS to ST-BUS 2.048 Mbit/s or 8.192 Mbit/s CSTo (E1) ST-BUS DSTo PCM30 Receive CRC-4 Frame Timeslot Data Bits (B7-B0) Timeslot CRC-4 Frame Data Bits (B1-B8) all n + m(15) P1, P2, P3, P4, P5, P6, P7, P8 15 all P1, P2, P3, P4, P5, P6, P7, P8 all n + m(16) P1, P2, P3, P4, P5, P6, P7, P8 16 all P1, P2, P3, P4, P5, P6, P7, P8 all n + m(31) P1, P2, P3, P4, P5, P6, P7, P8 31 all P1, P2, P3, P4, P5, P6, P7, P8 Note 1. For 2.048 Mbit/s operation, m=1 and n=0. Note 3. For these functions to be valid, CCS mode must be selected (CSIG=1 register address Y03). Table 30 - Receive PCM30 CCS to ST-BUS 2.048 Mbit/s or 8.192 Mbit/s DSTo (E1)

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8.2.5 CCS (Timeslot 16) Programming Options Summary Table

Control Data Source Data Destination Bit Register Method *Bits Timeslot or Register Method *Bits Timeslot or Register CSIG=1 Y03 ST-BUS CSTi P1-P8 any n where n=0-31 PCM30 TPOS-TNEG P1-P TS15E=1 Y06 15C4-0=n Y07 CSIG=1 Y03 any n where n=0-31 TS15E=1 Y06 16C4-0=n Y07 CSIG=1 Y03 any n where n=0-31 TS15E=1 Y06 31C4-0=n Y07 CSIG=1 Y03 ST-BUS DSTi 15 15 TS15E=0 Y06 CSIG=1 Y03 16 16 TS16E=0 Y06 CSIG=1 Y03 31 31 TS31E=0 Y06 CSIG=1 Y03 PCM30 RPOS-RNEG

15 ST-BUS

n=0-31 TS15E=1 Y06 15C4-0=n Y07 CSIG=1 Y03 16 any n where n=0-31 TS16E=1 Y06 16C4-0=n Y07 CSIG=1 Y03 31 any n where n=0-31 TS31E=1 Y06 31C4-0=n Y07 CSIG=1 Y03 all n where n=0-31 ST-BUS DSTo all n where n=0-31 * Notes 1. ST-BUS “Bits” are from MSB (B7) to LSB (B0) with P1 the MSB 2. PCM30 “Bits” are from MSB (B1) to LSB (B8) with P1 the MSB Table 31 - CCS (Timeslot 15, 16 & 31) Source and Destination Summary Table (E1)

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9.0 HDLC

The MT9072 has 1 embedded HDLC controller for each of the framers. Each controller may be attached to any timeslot. The HDLC can also be connected to the FDL bits (T1 ESF Mode) for provision of a 4 Kbit/s Data Link or Sa bits in E1 mode for data link up to 20 Kb/s. The features of the HDLC are:

Independent transmit and receive FIFO;
Receive FIFO maskable interrupts for nearly full and overflow conditions;
Transmit FIFO maskable interrupts for ne arly empty and underflow conditions;
Maskable interrupts for transmit end-of-packet and receive end-of-packet;
Maskable interrupts for receive bad-frame (includes frame abort);
Transmit end-of-packet and frame-abort functions. The relevant registers associated with HDLC are listed in Table 32. Register Address Register Description Y06 HDLC and DataLink Control The bits of this register determine whether the HDLC is connected to the Data Link or payload. YF2 HDLC Control General configuration for the HDLC. YF3 HDLC Test Control Control bits for testing the HDLC such as loopbacks. YF4 Address Recognition Address recognition regist er for storing data in the Receive FIFO of a packet that matches the received address. YF5 Transmit FIFO This register is used for writing data to the HDLC Transmit FIFO. The data from the FIFO can be subsequently sent to Data Link or a selected channel. YF6 Transmit Byte Counter This counter determine s the size of the HDLC packet to be sent when the cycle bit is set (YF2). Y1D HDLC Status This register provides status on the FIFO’s. Y1E Receive CRC This register provi des the received FCS of a packet. Y1F Receive FIFO This register has to be read to obtain the receive FIFO data. Y23 HDLC Latch Status These register bits ar e the latched version of the HDLC status. Y33 HDLC Interrupt Status This r egister provides the interrupt status of events such as underflow, go ahead packet etc. Y43 HDLC Interrupt Mask These register bits c an be used to mask HDLC events to cause interrupts. Table 32 - HDLC Related Registers

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9.1 HDLC Description

The HDLC handles the bit oriented prot ocol structure as per layer 2 of the switching protocol X.25 defined by CCITT. It transmits and receives the packetized data serial ly while providing data transparency by zero insertion and deletion. It generates and detects the flags, various link channel states and abort sequences. Further, it provides a cyclic redundancy check on the data packets us ing the CCITT defined polynomial. In addition, it can recognize a single byte, dual byte and all call address in the received frame. Access to Rx CRC and inhibiting of Tx CRC for terminal adaptation is also provided. The HDLC controller has two 32 byte deep FIFO’s associated with it; one for Transmit and one for Receive.

9.1.1 HDLC Frame Structure

A valid HDLC frame begins with an opening flag, contains at least 16 bits of address and control or information, and ends with a 16 bit FCS followed by a closing flag. Data form atted in this manner is also referred to as a “packet”. Refer to Table 33. All HDLC frames start and end with a unique flag sequence “01111110”. The transmitter generates these flags and appends them to the packet to be transmitted. The receiv er searches the incoming dat a stream for the flags on a bit- by-bit basis to establish frame synchronization. The data field consists of an address field, control field and information field. The address field consists of one or two bytes directly following the opening flag. The control fi eld consists of one byte directly following the address field. The information field immediately follows the control field and consists of N bytes of data. The HDLC does not distinguish between the control and information fields and a packet does not need to contain an information field to be valid. The FCS field, which precedes the clos ing flag, consists of two bytes. A cyclic red undancy check utilizing the CRC-CCITT standard generator polynomial “X16+X12+X5+1” produces the 16-bit FCS. In the transmitter the FCS is calculated on all bits of the address and data field. The comp lement of the FCS is transmi tted, most significant bit first, in the FCS field. The receiver calculates the FCS on the incoming packet address, data and FCS field and compares the result to “F0B8”. If no transmission errors are detected and the packet between the flags is at least 32 bits in length then the address and data are entered into the receive FIFO minus the FCS which is discarded.

9.1.2 Data Transparency (Zero Insertion/Deletion)

Transparency ensures that the contents of a data pack et do not imitate a flag, go-ahead, frame abort or idle channel. The contents of a transmitted frame, between the flags, is examined on a bit-by-bit basis and a 0 bit is inserted after all sequences of 5 contiguous 1 bits (includi ng the last five bits of the FCS). Upon receiving five contiguous 1s within a frame the receiver deletes the following 0 bit.

9.1.3 Invalid Frames

A frame is invalid if one of the following four conditions exists (Inserted zeros are not part of a valid count):

If the FCS pattern generated from the received data does not match the “F0B8” pattern then the last data byte of the packet is written to the re ceived FIFO with a ‘bad packet’ indication.
A short frame exists if there are less than 25 bits betw een the flags. Short frames are ignored by the receiver and nothing is written to the receive FIFO. Flag (7E) Data Field FCS Flag (7E) One Byte 01111110 n Bytes n ≥ 2 Two Bytes One Byte 01111110 Table 33 - HDLC Frame Format

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Packets which are at least 26 bits in length but less than 32 bits between the flags are also invalid. In this case the data is written to the FIFO but the la st byte is tagged with a “bad packet” indication.
If a frame abort sequence is detected the packet is invalid . Some or all of the current packet will reside in the receive FIFO, assuming the packet length before the abort sequence was at least 25 bits long.

9.1.4 Frame Abort

The transmitter will abort a current pa cket by substituting a zero followed by seven contiguous 1s in place of the normal packet. The receiver will abor t upon reception of seven contiguous 1s occurring between the flags of a packet which contains at least 25 bits. Note that should the last received by te before the frame abort end with cont iguous 1s, these are included in the seven 1s required for a receiver abort. This means that the location of the abort sequence in the receiver may occur before the location of the abort sequenc e in the originally transmitted pack et. If this happens then the last data written to the receive FIFO will not correspond exactly with the last byte sent before the frame abort.

9.1.5 Interframe Time Fill and Link Channel States

When the HDLC transmitter is not sending packets it will wait in one of two states

Interframe Time Fill state: This is a continuous seri es of flags occurring between frames indicating that the channel is active but that no data is being sent.
Idle state: An idle Channel occurs when at least 15 contiguous 1s are transmitted or received. In both states the transmitter will exit the wait state when data is loaded into the transmitter FIFO.

9.1.6 Go-Ahead

A go ahead is defined as the pattern "011111110" (contiguous 7Fs) and is the occurrence of a frame abort sequence followed by a zero, outside of the boundaries of a normal packet. Being able to distinguish a proper (in packet) frame abort sequence from one occurring outside of a packet allows a higher level of signaling protocol which is not part of the HDLC specifications.

9.1.7 Functional Description

The HDLC transceiver can be reset by either the power re set input signal or by the HRST Control bit in the HDLC Test control register (YF3). When reset, the HDLC Contro l Registers are cleared, resu lting in the transmitter and receiver being disabled. The Receiver and Transmitter can be enabled independent of one another through HDLC control(YF2 bits RXEN and TXEN). The transceiver input and output are e nabled when the enable control bits in HDLC control are set. Transmit to receive loopback as well as a receive to transmit loopback are also supported. Transmit and receive bit rates and enables can operate independently. Received packets from the serial interface, are sectioned into bytes by an HDLC receiver that detects flags, checks for go-ahead signals, removes inserted zeros, performs a cyclical redundancy check (CRC) on incoming data, and monitors the address if required. Packet reception begins upon detection of an opening flag. The resulting bytes are concatenated with two status bits (RQ9, RQ8 in HDLC status register Y1D) and placed in a receiver first-in-first-out (Rx FIFO); a buffer register that generates status and interrupts for microprocessor read control. In conjunction with the control circuitry, the microprocessor writes data bytes into a Tx buffer register (Tx FIFO) that generates status and interrupts. Packet transmission begins when the microprocessor writes a byte to the Tx FIFO. Two status bits are added to the Tx FIFO for transmitter control of frame aborts (FA) and end of packet (EOP) flags. Packets have flags appended, zeros inserted, and a CRC, also referred to as frame checking sequence (FCS), added automatically during serial trans mission. When the Tx FIFO is empt y and finished sending a packet, Interframe Time Fill bytes (continuous flags (7E hex)), or Mark Idle (conti nuous ones) are transmitted to indicate that the channel is idle.

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9.1.8 HDLC Transmitter

Following initialization and enabling, t he transmitter is in the Idle Channel state (Mark Idle), continuously sending ones. Interframe Time Fill state (Flag Idle) is se lected by setting the MI bit in register YF2 high 1. The Transmitter remains in either of these two states until data is wr itten to the Tx FIFO. YF2 bits EOP (end of packet) and FA (Frame Abort) are set as status bits before the microprocessor loads 8 bits of data into the 10 bit wide FIFO (8 bits data and 2 bits status). To change the tag bits being loa ded in the FIFO, HDLC Master Control must be written to before writing to the FIFO. However, EOP and FA are rese t after writing to the TX FIFO. The Transmit Byte Count Register(YF6) may also be used to tag an end of packet. The register is loaded with the number of bytes in the packet and decrements after every write to the Tx FIFO. W hen a count of one is reached, the next byte written to the FIFO is tagged as an end of pack et. The register may be made to cycle through the same count if the packets are of the same length by setting HDLC Master Control bit Cycle. If the transmitter is in the Idle Channel state when data is written to the Tx FIFO, then an opening flag is sent and data from Tx FIFO follows. Otherwise, data bytes are transmitted as soon as the current flag byte has been sent. Tx FIFO data bytes are continuously transmitted until either the FIFO is empty or an EOP or FA status bit is read by the transmitter. After the last bit of the EOP byte has been tr ansmitted, a 16-bit FCS is s ent followed by a closing flag. When multiple packets of data are loaded into Tx FIFO, only one flag is sent between packets. When the HDLC is connected to FDL or a transmit channel The least significant bit of the Transmit FIFO data is sent first on the serial stream. Frame aborts (the transmission of 7F he x), are transmitted by tagging a byte previously written to the Tx FIFO. When a byte has an FA tag, then an FA is sent instead of that tagged byte. That is, all bytes previous to but not including that byte are sent. After a Frame Abort, the trans mitter returns to the Mark Idle or Interframe Time Fill state, depending on the state of the Mark idle control bit. Tx FIFO underrun will occur if the FIFO empties and the la st byte did not have either an EOP or FA tag. A frame abort sequence will be sent when an underrun occurs. Below is an example of the trans mission of a three byte packet (’AA’ ’03’ ’77’ hex) (Interframe time fill). TXcen can be enabled before or after this sequence. (a) Write’0020’hex to Control Register 1 -Mark idle bit set (b) Write’AA’ hex to TX FIFO -Data byte (c) Write’03’hex to TX FIFO -Data byte (d) Write’01A0’ hex to Control Register 1 -TXEN; EOP; Mark idle bits set (e) Write’77’hex to TX FIFO -Final data byte The transmitter may be enabled independently of the receiver. This is done by setting the TXEN bit of the Control Register YF2. Enabling happens immediately upon writing to the register. Disabling using TXen will occur after the completion of the transmission of the present packet; the contents of the FIFO are not cleared. Disabling will consist of stopping the transmitter clock. T he Status and Interrupt R egisters may still be read a nd the FIFO and Control Registers may be written to while the transmitter is disabled. The transmitted FCS may be inhibited using the Tcrci bit of HDLC Master Control Register. In this mode the opening flag followed by the data and closing flag is sent and zero insertion still included, but no CRC. That is, the FCS is injected by the microprocessor as part of the data field. This is used in V.120 terminal adaptation for synchronous protocol sensitive UI frames. 1. If the MT9072A HDLC transmitter is set up in the Mark-Idle state (YF2 MI is 1) then it will occasionally (less than 1% of th e time) fail to transmit the opening flag when it is changed from the disabled state to the enabled state (YF2 TXEN changed from 0 to1). A missing opening flag will cause the packet to be lost at the receiving end. This problem only affects the first packet transmitted after the HDLC transmitter is enabled. Subsequent packets are unaffected.

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9.1.9 HDLC Receiver

After initialization and enabling, the receiver clocks in serial data, continuously checking for Go-aheads (0 1111 1110), flags (0111 1110), and Idle Channel states (at l east fifteen ones). When a flag is detected, the receiver synchronizes itself to the serial stream of data bits, automatically calculating the FC S. If the data length between flags after zero removal is less than 25 bits, then the packet is ignored so no bytes are loaded into Rx FIFO. When the data length after zero removal is between 25 and 31 bits, a first byte and bad FCS code are loaded into the Rx FIFO (see definition of RQ8 and RQ9 below). If address recognition is required, the Receiver Address Recognition Registers are loaded with the desired address and the Adrec bit in the HDLC Control R egister is set high(YF2). Bit 0 and 8 of the Address Register are used as enable bits for their respective byte, thus allowing either or both of the first two bytes to be compared to the expected values. Bit 0 of the first byte of the address received (address extension bit) will be monitored to determine if a single or dual byte address is being received. If this bit is 0 then a two byte address is being received and then only the first six bits of the fi rst address byte are compared. An all ca ll condition is also monitored for the second address byte; and if received the first address byte is ignored (not compared with mask byte). If the address extension bit is a 1 then a single byte address is being received. In this case, an all call condition is monitored for in the first byte as well as the mask byte written to the comparison register and the second byte is ignored. Seven bits of address comparison can be realized on the first byte if this is a single byte address by setting the Seven bit of HDLC control register (YF2). The following two Status Register bits (RQ8 and RQ9) ar e appended to each data byte as it is written to the Rx FIFO. They indicate that a good packet has been rece ived (good FCS and no frame abort), or a bad packet with either incorrect FCS or frame abort. The Status and Interrupt Registers should be read before reading the Rx FIFO since Status and Interrupt information correspond to the byte at the output of the FIFO (i.e., the byte about to be read). The Status Register bits are encoded as follows: RQ9 RQ8 Byte status 1 1 last byte (bad packet) 0 1 first byte 1 0 last byte (good packet) 0 0 packet byte The end-of-packet-detect (EOPD) interrupt indicates that the last byte written to the Rx FIFO was an EOP byte (last byte in a packet). The end-of-packet-read (EOPR) interrupt indicates that the byte abo ut to be read from the Rx FIFO is an EOP byte (last byte in a packet). The Status Register should be read to see if the packet is good or bad before the byte is read. A minimum size packet has an 8-bit address, an 8-bi t control byte, and a 16-bit FC S pattern between the opening and closing flags. Thus, the absence of a data transmission error and a frame length of at least 32 bits results in the receiver writing a valid packet code with the EOP byte in to Rx FIFO. The last 16 bits before the closing flag are regarded as the FCS pattern and will not be transferred to the receiver FIFO . Only data bytes (Address, Control, Information) are loaded into the Rx FIFO. In the case of an Rx FIFO overflow, no clocking occurs until a new opening flag is received. In other words, the remainder of the packet is not clocked into the FIFO. Also, the top byte of the FIFO will not be written over. If the FIFO is read before the reception of the next packet then reception of that pack et will occur. If two beginning of packet conditions (RQ9=0;RQ8=1) are seen in the FIFO , without an intermediate EOP status, then overflow occurred for the first packet. The receiver may be enabled independently of the transmitter. This is done by setting the RXEN bit of HDLC Control Register. Enabling happens immediately upon writing to the register. Disabling using RXEN will occur after the present packet has been completely loaded into the FIFO. Disabling can occur during a packet if no bytes have been written to the FIFO yet. Disabling will consist of di sabling the internal receive clock. The FIFO, Status, and Interrupt Registers may still be read while the receiver is disabled. Note that the re ceiver requires a flag before

Zarlink Semiconductor Inc. processing a frame, thus if the receiver is enabled in the middle of an incoming packet it will ignore that packet and wait for the next complete one. The receive CRC can be monitored in the Rx CRC Register(Y1E). This register contains the actual CRC sent by the other transmitter in its original form; that is, MSB first and bits inverted. These registers are updated at each end of packet (closing flag) received and therefore should be read when an end of packet is received so that the next packet does not overwrite the registers.

10.0 MT9072 Access and Control

10.1 Processor Interface (A11-A0, D15-D0, I/M , DS, R/W, CS, IRQ, Pins)

The control and status of the MT9072 is achieved throug h a non-multiplexed parallel microprocessor port capable of accommodating 12 address bits and 16 data bits. The pa rallel port may be configured for Motorola style control signals (by setting pin I/M low) or Intel style control signals (by setting pin I/M high).

10.1.1 Framer and Register Access

The controlling microprocessor gains access to specific registers and framers in the MT9072 through a single step process. Each of the eight internal framers is identifi ed by the upper four address bits (A11-A8). Addresses 0XX, Address 8XX accesses all 8 framers simultaneously for pr ocessor writes. In addition, there are seven registers which are global to all eight framers; the Interrupt Vector and the Interrupt Vector Mask Registers, ST-BUS Select Register and ST-BUS analyzer control registers. These are accessed with addresses 900 to 911. Throughout this document, the upper four address bits (A11-A8) are referred to as Y, (where Y indicates any hex number between 0 and 7). Each register in the eight internal framers is identified by the lower eight address bits (A7-A0). All registers provided in each of the eight framers are identical, with identical lower eight bit addresses. The lower eight address bits are partitioned such that the upper four bits (A7-A4) identify the register group (i.e., Control, Status, Interrupt Mask etc.) and the lower four bits (A3-A0 identify the particular register in the register group (i.e., Tx Alarm Control Word,signaling Control Word etc.), see Table 34. See Figures 22 and 23 for processor timing requirements. See the Registers section for detailed register descriptions. The MT9072 includes a status register which contains a15 bit identification code (address 912) for the MT9072. This code identifies the marketing revision. This byte a llows user software to track device revisions, and device variances and provide system variations if necessary. Refer to the registers section for details. Address A 11,A10,A9,A8 A7,A6,A5A4 A3,A2,A1,A0 Selects the framer(s) (i.e., 0, 1, 2, 3, 4, 5, 6, 7,all, global) Selects the register group (i.e., Control, Status, Interrupt Mask etc.) Selects the particular register in the register group (i.e., PRBS Error Counter etc.) Table 34 - Framer and Register Access

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10.1.1.1 CS and IRQ

The MT9072 includes a CS pin for applications where a single pr ocessor is controlling numerous peripherals. Processor access can be disabled without affecting framer operation. Refer to the CS pin description for details. An IRQ pin is provided with an extensive suite of maskable interrupts. Refer to the IRQ pin description and the interrupt section for interrupt processing details.

10.1.2 ST-BUS Interface (DSTi, DSTo, CSTi, CSTo Pins)

The ST-BUS is used for data and signaling access only and does not carry any MT9072 control information. Payload data is accessed through the DSTi and DSTo st reams. Channel Associate Si gnalling bits and Common Channel Signaling bits can be accessed through CSTi and CSTo streams. See Tables 2 to 6 for ST-BUS Channel to transmit/receive timeslot mapping. Dedicated data link pins are included which provide the user the option of bypassing the receive elastic buffer and accessing data link (DL) data with an external controller. The MT9072 provides numerous additional methods for accessing the DL, refer to the data link sections for details.

10.1.3 IMA Interface (DSTi, DSTo, Pins)

In the IMA (Inverse Mux for ATM) mode the transmit an d receive timing on the backplane are independent unlike the ST-BUS where all of the streams (DSTi/DSTo) are synchronous with a single cl ock (CKI) and a single frame pulse (FPI). The IMA mode is specifically intended to interface to the Zarlink IMA devices such as MT90220. In IMA mode the RXBF and RXDLC pins provide the receive frame pul se and receive clock for the data appearing at the DSTo pin. The FPi and CKi pins are inputs for the transmit frame pulse and transmit clock for data appearing at the DSTi pin. Note that in the IMA Mode, the slip buffers will be bypa ssed. On the transmit side data is accepted in the DSTi streams with respect to the CKi clock. The transmit clock TXCL (an input clock in T1 Mode) has to be synchronous to the CKi clock. On the receive side the EXCLi clock is the master and the DSTo data is synchronous to the EXCLi clock. In T1 IMA mode the backplane operates at 1.544 Mbit/ s with the frame pulse cent ered on the S-Bit, the timing diagrams are shown in Figures 32 and 33. In order to provide the extracted 1.544 Mbit/s clock the E1.5CK bit in the Data Link Control Register (Y06) must be set. The receive and transmit slip buffers are bypassed in this mode. In E1 IMA mode the backplane operates at 2.048 Mbit/s in a manner similar to the ST-BUS, the timing diagrams are shown in Figures 51 and 52. The receive slip buffer is bypassed in this mode. Note that in IMA mode the ST-BUS selection in register 900 is ignored. If IMA mode is selected the following functions are not supported:

8.192 Mbits backplane mode
Robbed bit signaling and CAS
Digital milliwat patterns
One, two second timers and latching of counters at 1 sec timer
G C I m o d e
Data link insertion extraction of FDL (the HDLC can be assigned to the FDL IMA mode)

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10.1.4 Signaling Mu ltiframe Boundary (RxMF , TxMF Pins)

Dedicated multiframe boundary pins ar e included which provide the user the option of setting the multiframe boundaries and identifying the multiframe boundar ies with an external device. Refer to the RxMF and TxMF pin descriptions.

10.1.5 Control Pins

10.1.5.1 Reset Operation (RESET Pin, RST Bit and RSTC Bit)

The MT9072 can be reset using the hardware RESET pin or the software reset bits: RST (register address YF1) and RSTC (address 900). The RST bit resets a particular framer and the RSTC bit is a global software reset bit. On initial power up, a hard reset must be done using the RESET pin. A valid reset condition requires both of these inputs to be held low for a minimum of 100 ns. These inputs should be set to zero during initial power up, then set to one. After initial power up, the MT9072 can be reset using the hardware RESET pin or the software reset bit RSTC (register address 900). When the device emerges from its reset state, it will b egin to function in T1 mode and the control registers will be initialized as described in Table 36. Clearing the T1E0 bit in register 900 to place the MT9072 in E1 mode will cause another internal reset and the control registers will be initialized to their E1 defaults as described in Table 37. In addition, individual framers may be reset with the software reset bit RST. Using the RST will reset the individual framer to its default E1 or T1 setting. RST will not affect the common control register (9xx). All reset operations take 1 full frame (125 us) to complete. Refer to the RESET pin description, RSTC and RST bit descriptions for additional details. Register Address Register Description Y00 Framing Mode Select Setting the IMA bit w ill cause the framer to enter IMA mode. Y06 HDLC & Datalink Control E1.5CK bit must be set to provide a 1.544 MHz clock on RXDLC. Table 35 - Registers Related to IMA Mode Function Status Control Bits Reset Value Register Address Framing Mode Mode D4,Reframe criteria is set for 2 bits errors in 4 bits,Fs bit is not included in the synchronization criteria, S-bit not included in CRC calculation. The elastic stores are not bypassed. RELBY,TELBY,TRANSP,T1DM,ESF,SLC 96,CXC,RS10,FSI,ReFR,MFReFR,JTS,T XSYNC =0 Y00 Line Coding and Interface The T1 interfaces are set to NRZ, Bipolar,and Rising edge of clocks for output and falling for input line clocks.TxB8ZS and RxB8ZS and Transmit PDV enforcer is turned off. RZCS1:0,TZCS2:0TPDV,TXB8ZS,RXB8 ZS,ADSEQ,RZNRZ,UNIBI,CLKE = 0 Y01 Transmit Alarms All sending alarms are deactivated. TESFYEL,TXSECY ,TD4YEL,TAIS #,T1DMY,D4SECY,SO = 14 Y02 Table 36 - Reset Status (T1)

Zarlink Semiconductor Inc. Transmit Error Insertion All error insertion controls are disabled. L32Z,BPVE,CRCE,FTE,FSE,LOSE,PER R = 0 Y03 Signaling All signaling freeze and debounce functions are disabled and the transmit signaling type is set such that A in frame 6 and B in frame 12. Robbed bit signaling is turned on for transmitter and receiver. CSIGEN,RBEN,TSDB,RSDB,RFL,SM1-0 ,SIP1-0= hex 200 Y04 Loopbacks All loopbacks deactivated; ready to send receive framed in band loopback codes. DLBK,RLBK,STLBK,PLBK,TLU, TLD = 0 Y05 Data Link Data Link is deactivated, hence bit oriented message, and HDLC are also disabled. #,#,#,#,HCH4:0,HPAYSEL,E1.5CK, DLCK,EDLEN,BOMEN,HDLCEN,H1R6 4 = 0 Y06 Bit Oriented Message Registers The Transmit Bit oriented message register and Receive Bit oriented Match register are cleared. TxBOM7:0, RXBOMM7:0 = 0 Y07-Y08 In band loopback activation codes The transmit and expected receive inband loopback codes are set to T1.403 defaults. TXLACL1-0,TXLAC7-0 = binary00 00000001 TXLDCL1-0,TXLDC7-0 = binary 01 00001001 RXLACL1-0,RXLACM7-0 = binary00 00000001 RXLDCL1-0,RXLDCM7-0 = binary 01 00001001 Y0D-Y0F YF0 Interrupts and IO Control All interrupts are suspended and CSTO and DSTo enables are off Tx8KEN,RXDO,TXMFSEL, SPND,INTA,DSToEN,CSToEN,RxCO,C NTCLR,SAMPLE,RST = 0 YF1 Latched Status All latched status bits are cleared Y10-Y2F Per Channel Control Per Channel inversion, Remote timeslot loopback, local timeslot loopback,transmit test, receive test, Clear channel, Receive freeze, transmit freeze are all turned off RPCI,MPDR,MPST,TCPI,RTSL,LTSL,TT ST,RRST,MPDT,CC=0 Y90-YAF Interrupts Masks and status Registers All interrupts are unmasked. Receive Sync and Alarm status & Mask, Counter statusMask, Receive Line Status Mask, Elastic store status mask and HDLC Status Mask = 0 Y43 TO Y46 Function Status Control Bits Reset Value Register Address Table 36 - Reset Status (T1)

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10.1.5.2 Transmit AIS Operation (TAIS Pin)

The TAIS pin allows all eight framers of the MT9072 to transmit an all ones signal (AIS) at the TPOS and TNEG output pins from the point of power-up, without the need to write any control registers. During this time the IRQ pin is in a high impedance state. After the interface has bee n initialized normal operation can take place by making TAIS high. 10.1.5.3 IEEE 1149.1-1990 Test Access Port (TAP) Five signals (TDI, TDO, TMS, TCK & TRST ) make up the Test Access Port (TAP) of the IEEE 1149.1-1990 Standard Test Port and Boundary-Scan Ar chitecture. The TAP provides access to test support functions built into the MT9072. The TAP is also referred to as a JTAG (Joi nt Test Action Group) port. See the JTAG section for additional details.

10.1.6 Data Link (DL) Interf ace (RxDL, RxDLC, TxDL, TxDLC Pins)

Dedicated data link pins are included which provide the user the option of bypassing the receive elastic buffer and accessing timeslot 0 data link (DL) data with an exte rnal controller. The MT9072 provides numerous additional methods for accessing the DL, refer to the DL sections for details. Function Status Control Bits Register Address Mode Termination RxTRS=0, TxTRS=0 Y03 Loopbacks Deactivated DLBK,RLBK,SLBK,PLBK=0 RTSL(n), LTSL(n)=0 Y01 Y90-YAF Transmit FAS C n0011011 CSYN =0 Y00 Transmit non-FAS 1/S n1111111 Y03 Y03 Y03 Transmit MFAS (CAS) 00001111 TMA1,2,3,4=0 X1,Y,X2,X3=1 Y05 Y05 Data Link Pin Deactivated Sa4SS1-0,Sa5SS1-0,Sa6SS1-0,Sa 7SS1-0,Sa8SS1-0=0 Y08 CRC Interworking Activated AUTC=0 Y00 Signaling CAS ST-BUS Source CSIG=0 CASS(n)=0 Y03 Y50-Y6F ABCD Bit Debounce Deactivated DBNCE=0 Y05 Interrupts All Unmasked Suspended ALL MASK BITS =0 SPND=0, INTA=0 Y40-Y43 Y02 RxMF Output signaling Multiframe MFSEL=0 Y02 Error Insertion Deactivated E1, E2, BPVE,CRCE,FASE, NFSE,LOSE,PERR=0 Y01 Counters Cleared ALL BITS =0 Y15-Y1A Counter Latches Cleared ALL BITS =0 Y28-Y2B Per Timeslot Control Buffer All locations cleared ALL BITS =0 Y90-YAF All Other Control Registers All locations cleared ALL BI TS =0 All Other Control Table 37 - Reset Status (E1)

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10.1.7 Multiframe Boundary (RxMF , TxMF Pins)

11.0 ST-BUS Analyzer

The ST-BUS Analyzer is a powerful system diagnostic and debugging tool. The ST-BUS Analyzer allows for the capture of any ST-BUS data stream or channel to a 32 byte memory. The ST-BUS Analyzer can capture a single frame of data or 32 samples of a specified channel from DSTi, DSTo, CSTi or CSTo from any one of the 8 framers. The analysis can be performed continuously or on a sing le shot basis where 32 bytes are captured and then the analysis is suspended. An optional interrupt can be gene rated when a single shot analysis is complete. The operation of the ST-BUS analyzer is controlled by Global Control Register 1 (901).

12.0 Loopbacks

12.1 T1 Loopbacks

In order to meet PRI Layer 1 requirements and to assist in circuit fault sectionalization, the MT9072 has 7 loopback functions. The control bits for digital, remote, ST-BUS and paylo ad loopbacks are located at address Y05. The remote and local timeslot loopbacks are controlled through control bits of the Timeslot Control register located at addresses Y90-YA7. a) Digital loopback (DG Loop) - DSTi to DSTo at the PCM24 side. Bit DLBK = 0 normal; DLBK = 1 activate. b) Payload loopback (PL Loop) - Payload loopback (DSTo to DSTi). Bit PLBK = 0 normal; PLBK = 1 activate. The payload loopback is effectively a physical connection of DSTo to DSTi within the framer. Note: Set RxDO (YF1 bit 9 to 1) to obtain correct data at the Tx. c) Local and Remote Timeslot Loopback. Remote timeslot loopback control bit RTSL = 0 normal; RTSL = 1 activate (Register Y90-YA7) will loop around transmit ST-BUS time slots to the DSTo stream. Local timeslot loopback bits LTSL = 0 normal; LTSL = 1 activate(Register Y90-YA7), will loop around receive PCM24 timeslots towards the remote PCM24 end. MT9072 TxDSTi DSTo System PCM24 MT9072 TxDSTi DSTo System PCM24Rx

Zarlink Semiconductor Inc. d) Framer Remote loopback - Internally connects RPOS and RNEG of one framer to TPOS and TNEG respectively of one of the other integrated framers. Bit RLBK01, RLBK23, RLBK45, RLBK67 = 0 normal; = 1 activate. 8M b i t / s m o d e : Bit RLBK8 = 0 normal; = 1 activate. e) Framer ST-BUS loopback(Register 904) - Internally connects DSTi of one framer to DSTo of one of the other integrated framers. Bit SLBK01, SLBK23, SLBK45, SLBK67 = 0 normal; = 1 activate. 8M b i t / s m o d e : Bit SLBK8 = 0 normal; = 1 activate. MT9072 TxDSTi DSTo System PCM24 Rx MT9072 Framer 0,2,4,6 Tx DSTo System PCM24Rx DSTi MT9072 Framer 1,3,5,7 DSTo SystemDSTiTx Rx MT9072 Framer 0-3 Tx DSTo[0] System PCM24Rx DSTi[0] MT9072 Framer 4-7 DSTo[4] SystemDSTi[4]Tx Rx MT9072 Framer 0,2,4,6 Tx DSToSystemPCM24 RxDSTi MT9072 Framer 1,3,5,7 DSTo DSTi Rx Tx PCM24 MT9072 Framer 0-3 Tx DSTo[4] SystemPCM24 RxDSTi[0] MT9072 Framer 4-7 DSTo[0] DSTi[4] Rx Tx PCM24

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12.2 T1 In Band Loopback Codes

T1.403 defines SF mode line loopback activate and deac tivate codes. These codes are either a framed or unframed repeating bit sequence of 00001 for activation or 001 for deactivatio n. The standard goes on to say that these codes will persist for five seconds or more before the loopback action is taken. The MT9072 will detect both framed and unframed line activate and de-activate codes even in the presence of a BER of 3 x 10-3. Line Loopback Disable Detect - LLDD - in the Alarm Status Word (Y10 ) will be asserted when a repeating 001 pattern (either framed or unframed) has persisted fo r 48 milliseconds. Line Loopback Enable Detect LLED in the Alarm Status Word will be asserted when a repeating 00001 patter n (either framed or unframed) has persisted for 48 milliseconds. Other loopup and loopdown codes can be selected by writing to Transmit Loop Activate and Loop Deactivate Code registers(Y0D and Y0E). The selection of the expected received loopup and loopdow n code is done by writing to registers Receive Loopup Code and Receive Loop Deactivate Code Match registers(Y0F and YF0). Interrupt status bits LLEDI and LLDDI will be set upon det ection of inband loopup or loopdown codes respectively. Maskable interrupts can be generated by disabling the mask bits in Receive line status and Timer mask (Y45 bit 5). Register Address Register Description Y05 Loopback Control This register contai ns the loopbacks within the framer. Y90-YAF Per Channel Control RTSL and LTSL are per channel loopbacks. 904 Framer Loopback Global Register This regist er contains framer to framer loopbacks. Table 38 - Registers Related to Loopbacks (T1) Register Address Register Description Y02 Transmit Alarm Control If the SO bit is set, ther e will be framed loop codes, otherwise they will be unframed. Y05 Loopback Control Setting TLU or TLD will ca use the transmitter to start sending the appropriate loopup and loopdown code. Y0D Transmit Loop Activate Code This register contains the loop activate code which will be sent on the Tx PCM stream when TLU is set. It also contains 2 bits for code length. Y0E Transmit Loop Deactivate Code This register contains the loop deactivate code which will be sent on the Tx PCM stream when TLD is set. It also contains 2 bits for code length. Y0F Receive Loop Activate Code Match This register contains the loop activate code which will cause an interrupt if received on the RX PCM stream. It also contains 2 bits for code length. YF0 Receive Loop Deactivate Code Match This register contains the loop deactivate code which we are looking for on the RX PCM stream. It also contains 2 bits for code length. Y10 Synchronization and Alarm Status LLED and LLDD will be high when their respective loop codes are detected in the match registers. Table 39 - Registers Related to In Band Loopbacks (T1)

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12.3 E1 Loopbacks

In order to meet PRI Layer 1 requirements and to assist in circuit fault sectionalization, the MT9072 has 7 loopback functions. Table 40 specifies the registers related to controlling the different loopbacks. a) Digital loopback (DG Loop) - DSTi to DSTo at the PCM30 side. Bit DLBK = 0 normal; DLBK = 1 activate. The control bits for digital, remote, ST-BUS and paylo ad loopbacks are located at address Y05. The remote and local timeslot loopbacks are controlled through control bits of the Timeslot Control register located at addresses Y90-YAF. b) Payload loopback (PL Loop) - Payload loopback (DSTo to DSTi). Bit PLBK = 0 normal; PLBK = 1 activate. The payload loopback is effectively a physical connection of DSTo to DSTi within the MT9072. Y35 Receive Line and Timer Interrupt Status LLEI and LLDI are the interrupts for LLED and LLDD. Y45 Receive Line and Timer Interrupt Mask LLEIM and LLDIM are the masks for LLEI and LLDI. Register Address Register Description Y01 Test, Error and Loopback Control Register The bits DLBK,RLBK, SLBK and PLBK can be used for digital loopback, remote loopback, ST-BUS and loopback. Y02 Interrupt and IO control register RxDO and RxCO have to one for certain loopbacks to work. Y90 to YAF Timeslot Control Register Local and Remote Timeslot Control Register allows for Timeslot Loopbacks (RTSLand TTSL).

904 Framer Loopback Global

Framer to Framer ST-BUS and Remote Loopbacks. Table 40 - Register Related to Setting Up Loopbacks (E1) Register Address Register Description Table 39 - Registers Related to In Band Loopbacks (T1) MT9072 TxDSTi DSTo System PCM30 MT9072 TxDSTi DSTo System PCM30Rx

Zarlink Semiconductor Inc. c) Local and Remote Timeslot Loopback . Remote timeslot loopback control bit RTSL = 0 normal; RTSL = 1 activate, will loop around transmit ST-BUS timeslots to the DSTo stream. Local timeslot loopback bits LTSL = 0 normal; LTSL = 1 activate, will loop around receive PCM30 timeslots towards the remote PCM30 end. d) Framer Remote loopback - Internally connects RPOS and RNEG of one framer to TPOS and TNEG respectively of one of the other integrated framers. Bit RLBK01, RLBK23, RLBK45, RLBK67 = 0 normal; = 1 activate. 8M b i t / s m o d e : Bit RLBK8 = 0 normal; = 1 activate. e) Framer ST-BUS loopback - Internally connects DSTi of one framer to DSTo of one of the other integrated framers. Bit SLBK01, SLBK23, SLBK45, SLBK67 = 0 normal; = 1 activate. 8M b i t / s m o d e : Bit SLBK8 = 0 normal; = 1 activate. MT9072 TxDSTi DSTo System PCM30 Rx MT9072 Framer 0,2,4,6 Tx DSTo System PCM30Rx DSTi MT9072 Framer 1,3,5,7 DSTo System DSTi Tx Rx MT9072 Framer 0-3 Tx DSTo[0] System PCM30Rx DSTi[0] MT9072 Framer 4-7 DSTo[4] System DSTi[4] Tx Rx MT9072 Framer 0,2,4,6 Tx DSToSystemPCM30 RxDSTi MT9072 Framer 1,3,5,7 DSTo DSTi Rx Tx PCM30 MT9072 Framer 0-3 Tx DSTo[4] SystemPCM30 RxDSTi[0] MT9072 Framer 4-7 DSTo[0] DSTi[4] Rx Tx PCM30

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13.0 Performance Monitoring

13.1 T1 Error Counters

The MT9072 has nine error counters for each framer, which can be used for maintenance testing and ongoing measurement of the quality of a DS1 link and to assist the designer in meeting specifications such as TR62411 and T1.403. All counters can be preset or cleared by writing to the appropriate counter registers. Associated with each counter is a maskable event occurrence interrupt and a maskable counter overflow interrupt. Overflow interrupts are useful when cumulative error c ounts are being recorded. For example, every time the framing bit error counter overflow interrupt (FEO) o ccurs, 65536 frame errors have been received since the last FEO interrupt. Also if a counter over flows, the overflow indicators are la tched in the Overflow reporting latch register(Y24). All counters are cleared by a counter clear bit -CNTCLR - low to high transition (bit 2 of the IO Control Word, YF1). An alternative approach to event reporting is to mask error events and to enable the 1 second sample bit (SAMPLE - bit 1 of the Interrupt and IO Control Word). When this bit is set the latched version of the counters(Y28 to Y2C) for change of frame alignment, loss of frame alignment, bpv errors, crc errors, errored framing bits, and multiframes out of sync are updated on one second intervals coincident with the maskable one second interrupt timer. Counter Interrupt Status Bits 1 Second Latch Description Bits Address Indicatio n Overflow Description Bit Address PRBS Error Counter and CRC Multiframe counter for PRBS PS7-0, PSM7-0 Y15 PRBSI PRBSOI PRBSMFOI NA NA NA Multiframe Out of Frame Counter MFOOF 7-0 Y16 MFOOFI MFOOFOI Multiframe Out of Frame Count Latch MFOO FL15-0 Y2C Framing Bit Error Counter FC15-0 Y17 FBEI FEOI Framing Bit Error Counter Latch FCL15- Y28 BPV Counter BPV15-0 Y18 BPVI BPVOI Bipolar Violation Count Latch BPVL 15-0 Y29 CRC-6 Error counter CC15-0 Y19 CRCI CRCOI CRC-6 Error Count Latch CRCL 15-0 Y2A Out of frame counter, change of frame alignment counter OOF7-0, COFA7-0 Y1A OOFOI COFAI OOFOI COFOIL Out of Frame, Change of Frame Alignment Count Latch OOFL 7-0 COFAL 7-0 Y2B Excessive Zero counter EXZ7-0, Y1B EXZI EXZOL NA NA NA Table 41 - Error Counters Summary (T1)

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13.2 E1 Error Counters

The MT9072 has eight error counters, which can be us ed for maintenance testing, and ongoing measurement of the quality of a PCM30 link and to assi st the designer in meeting specifications such as ITU-T I.431 and G.821. All counters can be preset or cleared by writing to the appropr iate locations. In addition, four error count latches are provided which latch the counter data coincident with the one second status bit. Counters can automatically be cleared (ACCLR register address Y03) after their data is latched. Associated with each counter is a maskable event indication interrupt and a maskable counter overflow interrupt. Overflow interrupts are useful when cumulative error counts are being recorded. For example, every time the fr ame error counter overflow (FEO) interrupt occurs, 256 frame errors have been received since the last FEO interrup t. The interrupt status regi ster bits are cleared when read. All non-latched error counters are cleared and by programming the counter clear bit (CNCLR register address Y03) low to high. See Table 43 for counter events and relationship between the counters. Register Address Register Description Y03 DL,CCS,CAS and other Control Register The CNCLR bit can be used to clear the non-latched counters. the ACCLR can be used to automatically clear 1 sec counter. Y15 PRBS Error Counter and CRC-4 Multiframe Counter PRBS counts bit errors and the CRC counter interval for each received multiframe. Y16 Loss of basic frame counter Counter that is incremented once per 125 usec whenever bsync is 1. Y17 E-bit error counter This counter counts the ebit errors. Y18 Bipolar violation counter. This counter counts the bipolar violation outside the HDB3 coding. This counter counts the bipolar violation outside the HDB3 coded zeros. Y19 CRC-4 error counter This counter is incremented for calculated crc-4 errors (CRCS1 and CRCS2). Y1A FAS bit error counter and FAS error counter This counter counts the FAS bit error and FAS errors. Y28 E bit error counter latch This counter is the one second latched version of Y17. Y29 BPV error counter latch This counter is a one second latched version of Y18. Y2A CRC-4 error counter latch This counter is a one second latched version of Y19. Y2B FAS error counter latch This counter is a one second latched version of Y1A. Y36 CAS,National, CRC-4 local and timer interrupt status register Oneseci is the one second interrupt status. This interrupt can be used for performance monitoring. Y46 CAS,National, CRC-4 local and timer interrupt mask register Onesecm is the one second interrupt status. This interrupt can be used for performance monitoring. Table 42 - Registers Required for Observing and Clearing Error Counters (E1)

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14.0 Maintenance and Alarms

14.1 T1 Maintenance and Alarms

14.1.1 T1 Error Insertion

Six types of error conditions can be inserted into the transmit DS1 data stream thro ugh control bits, which are located in address Y03 -Transmit Error Control Word. These error events include bipolar violation errors (BPVE), CRC-6 errors (CRCE), Ft errors (FTE), Fs errors (F SE), payload errors (PERR) and a loss of signal condition (LOSE). If LOSE is one the selected fr amer transmits an all zeros signal (no pulses) and zero code suppression is overridden. If LOSE bit is zero, data is transmitted normally.

14.1.2 T1 Per Timeslot Control

There are 24 per timeslot control registers occupying a total of 24 unique addresses (Y90-YA7). Each register controls a transmit timeslot and the equivalent channel data on DSTo. For example, register address Y90 of the first per timeslot control register contains program control for transmit timeslot 0 and DSTo channel 0.

14.1.3 T1 Per Timeslot Looping

Any channel or combination of channels may be looped fr om transmit (sourced from DSTi) to receive (output on DSTo) ST-BUS channels. When bit 4 (LTSL) in the Per Time slot Control Word(Y90-YA7) is set the data from the equivalent transmit channel is looped back onto the equivalent receive timeslot. Any channel or combination of channels may be looped from receive (sourced from the line data) to transmit (output onto the line) channel s. When bit 5 (RTSL) in the Per Timeslot Control Word is set the data from the equivalent receive timeslot is looped back onto the equivalent transmit timeslot. Counter Source Interrupt Status Bits 1 Second Latch Description Bits Address Bit Indicati on Overflow Description Bit Address PRBS Error Counter PEC7-0 Y15 PEI PEO NA NA NA PRBS CRC-4 MF Counter PCC7-0 Y15 CALN NA PCO NA NA NA Loss of Sync Counter SLC7-0 Y16 BSYNC BSYNC SLO NA NA NA E-bit Error Counter EEC15-0 Y17 REB1 REB2 EEI EEO E-bit Error Count Latch EEL15-0 Y28 BPV Error Counter VEC15-0 Y18 VEI VEO BPV Error Count Latch VEL15-0 Y29 CRC-4 Error Counter CEC15-0 Y19 CRCS1 CRCS2 CEI CEO CRC-4 Error Count Latch CEL15-0 Y2A FAS Bit Error Counter BEC7-0 Y1A BEI BEO FAS Bit Error Count Latch BEL7-0 Y2B FAS Error Counter FEC7-0 Y1A FEI FEO FAS Error Count Latch FEL7-0 Y2B Table 43 - Error Counter and Event Dependency (E1)

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14.1.4 T1 Pseudo-Random Bit Sequence (PRBS) Testing

The MT9072 includes both a pseudo random bit sequence (PRBS) generator of type (2 15-1), and a reverse PRBS generator (decoder), which operates on a bit sequence, and determines if it matches the transmitted PRBS type (215-1). Bits which don’t match are counted by an internal error counter. This provides for powerful system debugging and testing without additional external hardware. If control bit ADSEQ (register address Y01) is zero, any transmit (internal DSTi) timeslot or combination of transmit timeslots may be connected to the PRBS generator. Timeslot n is selected by setting the TTSTn bit in the Timeslot n Control Register (address Y90-YA7), where n is 0 to 23 . Any data sent on DSTi is overwritten on the selected timeslots before being output to TPOS/TNEG. Similarly, if control bit ADSEQ is zero, any receive timeslot or combination of receive timeslots may be connected to the PRBS decoder. Timeslot n is selected by setting the RRSTn bit in the Timeslot n Control Register (register address Y90-YA7), where n is 0 to 23. PRBS data is distributed to the transmit channels sequentially one byte at a time. Consequently, the data received must be in the same order that it was sent, in order for the PRBS decoder to correctly operate on the data. If one channel is tested at a time, then the PRBS tr ansmit timeslot does not have to match the PRBS receive timeslot. However, if more than one channel is tested, then the number of transmit timeslots must match the number of receive timeslots, and the order of the transmi t timeslots must match the or der of the receive timeslots. This will ensure that the sequential data bytes received by the PRBS decoder are in the correct order. Consequently, particular care must be taken when us ing an external loopback where the channel order may be reversed, or where the data has passed through a digita l switch which doesn’t buffer all channels to the same degree. The PRBS decoder must have sufficient data pass through it before it begins to operate correctly, therefore, the errors generated by the decoder immediately following start-up should be ignored. If the PRBS testing is performed in an external loop arou nd using Timeslot Control, then both Timeslot Control bits TTSTn and RRSTn should also be set. Register Address Register Description Y01 Line Interface and Coding ADSEQ bit chooses between Milliwatt test sequence and transmitted PRBS test sequence. Y90-YA7 Per Channel Control If TTST is set for any channel, the test sequence will be transmitted on that DS1 timeslot. If RRST is set for any channel, the test sequence will be expected on the receivePCM24 slot. Y15 PRBS Error Counter and CRC Multiframe Counter for PRBS The PRBS Error Counter contains error count on the received PRBS sequence. Y34 Receive Sync Interrupt Status PRBSOI will indicate an overflow on the PRBS Error Counter. Y44 Receive Sync Interrupt Mask PRBSOIM is the mask for PRBSOI. Table 44 - Registers Related to PRBS Testing (T1)

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14.1.5 T1 Mu-law Milliwatt

If the control bit ADSEQ is one (regis ter address Y01), the Mu-law digital milliwatt sequence (Table 45) defined by G.711, is available to be transmit on any combination of selected channels. The channel s are selected by setting the TTSTn control bit (register address Y90-YA7). The same sequence is available to replace received data on any combination of DSTo channels. This is accomplished by setting the RRSTn control bi t (register address Y90-YA7) for the corresponding channel. Note that Bit 1 is the sign bit and is sent first.

14.1.6 T1 Alarms

The alarms shown in Table 46 are detected by the receiver. Th e status register bits provide real time status of the alarm, while the interrupt status registers bits provide latched status indications which are cleared when read. Each interrupt status register may also generate a maskable interrupt. The possible transmitted alarms are also shown in the table. See the register bit descriptions for details. PCM 24 Payload Data Hex Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8

1 E 00011110

0 B 00001011

1 E 10011110

8 B 10001011

9 E 10011110

Table 45 - Mu Law Digital Milliwatt Pattern (T1) Control/Status Register Interrupt Status Register Description Bit Address Bit Address D4 Yellow Alarm. This bit is set if bit position 2 of virtually every DS0 channel is a zero for a period of 600 milliseconds. The alarm is tolerant of errors by permitting up to 16 ones in a 48 millisecond integration period. The alarm clears in 200 milliseconds after being removed from the line. D4YALM Y10 D4YALMI Y35 D4 Yellow Alarm - 48 millisecond sample. This bit is set if bit position 2 of virtually every DS0 channel is a zero for a period of 48 milliseconds. The alarm is tolerant of errors by permitting up to 16 ones in the integration period. This bit is updated every 48 milliseconds. D4Y48 Y10 D4Y48I Y35 Table 46 - Alarm Control and Status Bits (T1)

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14.1.7 T1 Per Timeslot Trunk Conditioning

The per channel conditioning capabilities of MT9072 are explained in this section. For the receiver the T1 data can be replaced by the conditioning data (Y09) via the bit MPDR in the per channel control registers(Y90 to YA7). This data will be output to the corresponding DSTo channel. The received data can be inverted on a per channel basis by setting the RPCI bit (register Y90 to YA7). The transmit data can be inverted on a per channel basis with a write to the control bit TPCI (registers Y90 to YA7). The transmit data can also be frozen on a per channel basis; in this case the data from the DSTI is not used to update the Transmit Memory and the data written in Y0A is used as the source (MPDT in registers Y90 to YA7). Secondary D4 Yellow Alarm. This bit is set if 2 consecutive’1’s are received in the S-bit position of the 12th frame of the D4 superframe. SECYEL Y10 SECYELI Y35 AIS Alarm. This bit is set if fewer than 5 zeros are received in a 3 millisecond window. AIS Y10 AISI Y35 ESFYEL.This bit is set if the ESF yellow alarm 0000000011111111 is receive in eight or more codewords out of ten in Bit Oriented Message of FDL. ESFYEL Y10 ESFYELI Y35 T1DM Received Yellow Alarm. If "Y" bit of the T1DM Synchronization Word is received T1DRY Y10 T1DMYI Y35 Transmit ESF Yellow Alarm. Setting this bit (while in ESF mode) causes a repeating pattern of eight 1’s followed by eight 0’s to be insert onto the transmit FDL. TESFYEL Y02 NA NA Transmit Secondary D4 Yellow Alarm. Setting this bit (in D4 mode) causes the S-bit of transmit frame 12 to be set. TSECY Y02 NA NA Transmit All Ones . When low, this control bit forces a framed or unframed (depending on the state of Transmit Alarm Control bit 0) all ones to be transmit at TTIP and TRING TAIS Y02 NA NA S-bit Override. If set, this bit forces the S-bits to be inserted as an overlay on any of the following alarm conditions: i) transmit all ones, ii) loop up code insertion, iii) loop down code insertion. SO Y02 NA NA TT1DMY. If reset to low a yellow alarm is sent in the 24th channel if the T1DM option is set. TT1DMY Y02 NA NA Control/Status Register Interrupt Status Register Description Bit Address Bit Address Table 46 - Alarm Control and Status Bits (T1)

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14.2 E1 Maintenance and Alarms

Extensive maintenance and alarm generation and detection functions are provided on the MT9072. The following table groups the registers for control and monitor of these functions.

14.2.1 E1 Error Insertion

Six types of error conditions can be inserted into the transmit PCM30 data stream th rough register control bits located at address Y01. These error events include the bi polar violation errors (BVE), CRC-4 errors (CRCE), FAS errors (FASE), NFAS errors (NFSE), payload (PERR) an d a loss of signal error (LOSE). The LOSE function overrides the HDB3 encoding function (no BPV are added). Also inclu ded are E1 and E2 error bit insertion on frames 13 and 15. See the bit descriptions (control register address Y01) for additional details.

14.2.2 E1 Per Timeslot Control

There are 32 per timeslot c ontrol registers occupy ing a total of 32 unique addr esses (Y90-YAF). Each register controls a matching timeslot on the 32 transmit channels (onto the line) a nd the equivalent channel data on the receive (DSTo) data. For example, register address Y91 of the first per timeslot cont rol register contains program control for transmit timeslot 1 and DSTo channel 1.

14.2.3 E1 Per Timeslot Looping

Any channel or combination of channels may be looped fr om transmit (sourced from DSTi) to receive (output on DSTo) ST-BUS channels. When bit 4 (LTSL) in the Per Time slot Control Word is set the data from the equivalent transmit timeslot is looped back onto the equivalent receive channel. Any channel or combination of channels may be looped from receive (sourced from the line data) to transmit (output onto the line) channel s. When bit 5 (RTSL) in the Per Timeslot Control Word is set the data from the equivalent receive timeslot is looped back onto the equivalent transmit channel. Register Address Register Description Y00 Alarm and Framing Control Register The TAIS and E bit errors and RAI can be set by this register. Y01 Test Error and Loopback Control Register BPVE, CRCE,FASE, NFSE and E bit errors can be inserted. Y05 CAS Control and Data Register The Y bit can be used to send Remote Multiframe Alarm signal. Y10 Synchronization and CRC-4 Remote Status The bits of this register provide good receiver error status. Y11 CRC-4 Timer and CRC-4 Local Status The CRC-4 errors are registered in Y11. Y12 Alarms and MAS Status This register provides AIS, RAI, LOSS status bits. Y24 Sync, CRC-4 remote alarm, MAS Latched Status Register Latched version of receive CRC errors and synchronization loss are available. Y34 Sync, CRC-4 Remote Alarm, MAS Interrupt status register This register provides bits for interrupt generation for Y24 CRC errors and synchronization loss functions. Y44 Sync, CRC-4 Remote Alarm, MAS Interrupt register mask This register provides bits for interrupt mask register for Y34. Table 47 - Registers Related to Maintenance and Alarms (E1)

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14.2.4 E1 Pseudo-Random Bit Sequence (PRBS) Testing

The MT9072 includes both a pseudo random bit sequence (PRBS) generator of type (2 15-1), and a reverse PRBS generator (decoder), which operates on a bit sequence, and determines if it matches the transmitted PRBS type (215-1). Bits which don’t match are counted by an internal error counter. This provides for powerful system debugging and testing without additional external hardware. If control bit ADSEQ (register address Y01) is zero, any transmit (internal DSTi) timeslot or combination of transmit timeslots may be connected to the PRBS generator. Timeslot n is selected by setting the TTSTn bit in the Timeslot n Control Register (addr ess Y90-YAF), where n is 0 to 31. Any data se nt on DSTi is overwritten on the selected timeslots. Similarly, if control bit ADSEQ is zero, any DSTo rece ive timeslot or combination of receive timeslots may be connected to the PRBS decoder. Timeslot n is selected by setting the RRSTn bit in the Timeslot n Control Register (register address Y90-YAF), where n is 0 to 31. Data on DSTo is not affected. PRBS data is distributed to the transmit channels sequentially one byte at a time. Consequently, the data received must be in the same order that it was sent, in order for the PRBS decoder to correctly operate on the data. The number of transmit timeslots mu st match the number of receive time slots, and the order of the transmit timeslots must match the order of the re ceive timeslots. This will ensure that the sequential data bytes received by the PRBS decoder are in the correct order. Consequently, particular care must be taken when using an external loopback where the channel order may be reversed, or where the data has passed through a digital switch which doesn’t buffer all channels to the same degree. The PRBS decoder must have sufficient data pass through it before it begins to operate correctly, therefore, the errors generated by the decoder immediately following start-up should be ignored. If the PRBS testing is performed in an external loop arou nd using Timeslot Control, then both Timeslot Control bits TTSTn and RRSTn should also be set.

14.2.5 E1 A-law Milliwatt

If the control bit ADSEQ is one (register address Y01), th e A-law digital milliwatt sequence (Table 48), defined by G.711, is available to be transmit on any combination of selected channels. The channel s are selected by setting the TTSTn control bit (register address Y90-YAF). The same sequence is available to replace received data on any combination of DSTo channels. This is accomplished by setting the RRSTn control bit (register address Y90-YAF) for the corresponding channel. Note that bit 1 is the sign bit and is sent first. PCM30 Payload Data Hex Bit 1 Bit 2 Bit 3 Bit 4 Bit 5 Bit 6 Bit 7 Bit 8 3 4 00110100 2 1 00100001 2 1 00100001 3 4 00110100 B 4 10110100 A 1 10100001 A 1 10100001 B 4 10110100 Table 48 - A-Law Digital Milliwatt Pattern (E1)

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14.2.6 E1 Alarms

The alarms shown in Table 49 are detected by the receiver. Th e status register bits provide real time status of the alarm, while the latched status regi sters provide a latched status indicati on, and the interrupt status registers provide a latched status indication (if unmasked) which generate a maskable interrupt and which are cleared when read. The persistent status registers provide latched status indication which is only cleared when read while the real time status bit is not set. See the register bit descriptions for additional details.

14.2.7 E1 Automatic Alarms

The transmission of RAI and signaling multiframe alarms can be made to func tion automatically from control bits ARAI and AUTY (register address Y00). When ARAI = 0 and basic frame synchr onization is lost (BSYNC = 1 address Y10), the MT9072 will automatically transmit th e RAI alarm signal to the far end of the link. The transmission of this alarm signal will cease when basic frame alignment is acquired. When AUTY = 0 and signaling multiframe alignment is not acquired (MSYNC = 1 address Y10), the MT9072 will automatically transmit the multiframe alarm (Y-bit) signal to the far end of the link. This transmission will cease when signaling multiframe alignment is acquired. Bit Add. Bit Add. Bit Add. Bit Add. Remote Alarm Indication RAI Y12 RAIL Y24 RAII Y34 RAIP Y27 Alarm Indication Signal AIS Y12 AISL Y24 AISI Y34 AISP Y27 Alarm Indication Signal 100ms KLVE Y12 Channel 16 Alarm Indication Signal AIS16 Y12 AIS16L Y24 AIS16I Y34 Auxiliary Pattern AUXP Y12 AUXPL Y24 AUXPI Y34 Loss of Signal LOSS Y12 LOSSL Y24 LOSSI Y34 LOSSP Y27 Remote signaling Multiframe Alarm Y Y12 YL Y24 YI Y34 T1 Timer T1 Y11 T1L Y26 T1I Y36 T2 Timer T2 Y11 T2L Y26 T2I Y36 Table 49 - Alarms and Timers Status Registers (E1)

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15.0 Interrupts

The MT9072 has an extensive suite of interrupts consis ting of 2 maskable interr upt vectors and 32 maskable interrupt status registers as shown in Figure 9 and an ST -BUS Analyzer Interrupt. The set bits in the 2 interrupt vectors identify which of the 32 interrupt status registers is responsible for the interrupt. Reading the corresponding interrupt status registers identifies the exact source of the interrupt. Any set bit in the interrupt vectors causes the IRQ pin to toggle low (providing the SPND bit is not set). Figure 9 - Interrupt Status Registers F R A M E R Elastic Interrupt Status Register 036 Rx Sync Interrupt Status Register 034 Rx Line Status Register 035 Elastic Store Mask Status 046 Rx Sync Mask Status Register 044 RX Line Mask Status Register 045 Framer 0 Master LatchStatus Registers 023 - 026 FRAMER 0 INTA SPND F R A M E R F R A M E R F R A M E R F R A M E R F R A M E R F R A M E R Interrupt Vector 1 Status Register Address 910 Interrupt Vector 1 Mask Register Address 902 4 4 4 4 4 4 4 4 4 4 4 IRQ Pin Interrupt Vector 1 Interrupt Vector 2 Status Register Address 911 Interrupt Vector 2 Mask Register Address 903 Interrupt Vector 2 IRQ 1 IRQ 2 HDLC Status Register 033 HDLC Mask Status Register 043 ST-BUS Analyser Interrupt

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15.1 Interrupt Status Register Overview

All 33 interrupt status regist ers are maskable with 33 corresponding interr upt mask registers. All interrupt status registers and all interrupt mask regist ers are 16 bits, although all 16 bits ar e not always used. Unused status bits may be either one or zero if read. When an unmasked interrupt occurs, one or more bits of the 33 interrupt status registers will go high causing one or more bits of the unmasked interrupt vector to go high. A high bit in the interrupt vector causes the output IRQ pin to go low (if enabled by SPND, INTA control bits). After an inte rrupt status register is read, it is automatically cleared. After all interrupt status registers are cleared, the interrupt vector is cleared causing the IRQ pin to return to a high impedance state. If a new unmasked interrupt occurs while the interrupt status registers from a previous interrupt are being read, the affected interrupt status registers will be updated, the interrupt vector will be updated, and the IRQ pin will remain low until all interrupt status registers are cleared. If the interrupt status registers are unm asked, and the interrupt vector is mask ed, the interrupt status registers will function normally, but they will not cause the IRQ pin to toggle low. Only set bits in the Interrupt Vector will cause the IRQ pin to toggle low. This is similar to the SPND control bit function, but instead of masking all selected framer interrupts, the interrupt vector mask can mask individual registers within the selected framers.

15.1.1 Interrupt Rela ted Control Bits and Pins

SPND - All interrupts for a particular framer may be su spended without changing the interrupt mask words, by setting the SPND control bit (register address YF1) to zero. All unmasked interrupt status registers will continue to be updated (and will be cl eared when read), but the selected framers in terrupt vector bits will remain at zero. Therefore that framer cannot toggle the IRQ pin. If all eight framer’s SPND bit are zero, then all interrupt vector bits will remain low, therefore none of the framers can toggle the IRQ pin. In some applications, a logic low at the IRQ pin lasting the full duration of t he interrupt service routine may be undesirable. In these cases, immediately following the interrupt, set the control bit SPND (register address YF1) low until the interrupt service routine is finished INTA - All interrupt and latched status registers for a particular framer may be cleared (without reading the interrupt status registers) by setting the INTA control bit (register address YF1) to zero. Interrupt status and latched registers for a particular framer will be cleared (and not updated) as long as INTA is low. Consequently, the selected framer’s interrupt vector bits will remain at zero, therefore that framer cannot toggle the IRQ pin. TAIS - During initial power up, all (8 framers) interrupt st atus registers are cleared without changing the interrupt mask words, when the TAIS control pin is held low. Consequently, the interrupt vector will remain clear and the IRQ pin will remain in a high impedance state. This allows for system initialization without spurious interrupts. Interrupt status registers will not be updated, and the IRQ pin will be forced to a high impedance state as long as TAIS is low. RESET or RST - After a MT9072 reset (RESET pin for all eight framers or RS T control bit (register address YF1) for a selected framer), all interrupt status register bits are unmasked, but the SPND and INTA control bits are set to zero.

15.2 Interrupt Servicing Methods

There are two common methods for identifying the source of an interrupt. The Polling Method is the simplest but uses the most processor time. The Vector Method requires a two step process, but uses the least amount of processor time.

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15.2.1 Polling Method

The IRQ pin goes low. 2. Read all 33 interrupt vector status r egisters. The bits which are set in thes e registers identify the source of the interrupt. As each register is read, it is cleared (all bits set to 0). When all registers are clear, the interrupt is cleared (the IRQ pin returns to logic high) and all sources of the interrupt are identified.

15.2.2 Vector Method

The IRQ pin goes low. 2. Read the interrupt vectors. These vectors identify whic h of the 33 (or which combinat ion of 33) interrupt status and Counter Overflow) caused the interrupt, more than one register may need to be read. 3. Read the interrupt status register(s) identified in step 2. The bits which are set in these registers identify the source of the interrupt. As each register is read, it is cleared (all bits set to 0). When all interrupt status registers are cleared, the interrupt vector goes to zero and the IRQ pin returns to logic high.

15.3 T1 Interrupt Vector and Interrupt Source Summary

Interrupt Vector Interrupt Vector Mask Interrupt Registers Address Bit Name Address Bit Name Status Address Mask Address Register Name Framer

911 F7HVS 903 F7HM 733 743 HDLC 7

911 F7EVS 903 F7EM 734 744 Receive Sync 7

911 F7RVS 903 F7RM 735 745 Receive Line 7

911 F7SVS 903 F7SM 736 746 Elastic store 7

911 F6HVS 903 F6HM 633 643 HDLC 6

911 F6EVS 903 F6EM 634 644 Receive Sync 6

911 F6RVS 903 F6RM 635 645 Receive Line 6

911 F6SVS 903 F6SM 636 646 Elastic 6

911 F5HVS 903 F5HM 533 543 HDLC 5

911 F5EVS 903 F5EM 534 544 Receive Sync 5

911 F5RVS 903 F5RM 535 545 Receive Line 5

911 F5SVS 903 F5SM 536 546 Elastic 5

911 F4HVS 903 F4HM 433 443 HDLC 4

911 F4EVS 903 F4EM 434 444 Receive Sync 4

911 F4RVS 903 F4RM 435 445 Receive Line 4

911 F4SVS 903 F4SM 436 446 Elastic 4

Table 50 - Interrupt Vector and Interrupt Source Summary (T1)

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15.4 E1 Interrupt Vector and Interrupt Source Summary

911 F3HVS 902 F3HM 333 343 HDLC 3

910 F3EVS 902 F3EM 334 344 Receive Sync 3

910 F3RVS 902 F3RM 335 345 Receive Line 3

910 F3SVS 902 F3SM 336 346 Elastic store 3

910 F2HVS 902 F2HM 233 243 HDLC 2

910 F2EVS 902 F2EM 234 244 Receive Sync 2

910 F2RVS 902 F2RM 235 245 Receive Line 2

910 F2SVS 902 F2SM 236 246 Elastic 2

910 F1HVS 902 F1HM 133 143 HDLC 1

910 F1EVS 902 F1EM 134 144 Receive Sync 1

910 F1RVS 902 F1RM 135 145 Receive Line 1

910 F1SVS 902 F1SM 136 146 Elastic 1

910 F0HVS 902 F0HM 033 043 HDLC 0

910 F0EVS 902 F0EM 034 044 Receive Sync 0

910 F0RVS 902 F0RM 035 045 Receive Line 0

910 F0SVS 902 F0SM 036 046 Elastic 0

Interrupt Vector Interrupt Vector Mask Latch Status, Interrupt Status and Interrupt Mask Register Source Address Bit Name Address Bit Name Latch Address Status Address Mask Address Register Name Framer

911 F7HI 903 F7HM 723 733 743 HDLC 7

911 F7NI 903 F7NM 724 734 744 National 7

911 F7CI 903 F7CM 725 735 745 Counter 7

911 F7SI 903 F7SM 726 736 746 Sync 7

911 F6HI 903 F6HM 723 633 643 HDLC 6

911 F6NI 903 F6NM 724 634 644 National 6

Table 51 - Interrupt Vector and Interrupt Source Summary (E1) Interrupt Vector Interrupt Vector Mask Interrupt Registers Address Bit Name Address Bit Name Status Address Mask Address Register Name Framer Table 50 - Interrupt Vector and Interrupt Source Summary (T1)

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911 F6CI 903 F6CM 725 635 645 Counter 6

911 F6SI 903 F6SM 726 636 646 Sync 6

911 F5HI 903 F5HM 523 533 543 HDLC 5

911 F5NI 903 F5NM 524 534 544 National 5

911 F5CI 903 F5CM 525 535 545 Counter 5

911 F5SI 903 F5SM 526 536 546 Sync 5

911 F4HI 903 F4HM 423 433 443 HDLC 4

911 F4NI 903 F4NM 424 434 444 National 4

911 F4CI 903 F4CM 425 435 445 Counter 4

911 F4SI 903 F4SM 426 436 446 Sync 4

910 F3HI 902 F3HM 323 333 343 HDLC 3

910 F3NI 902 F3NM 324 334 344 National 3

910 F3CI 902 F3CM 325 335 345 Counter 3

910 F3SI 902 F3SM 326 336 346 Sync 3

910 F2HI 902 F2HM 223 233 243 HDLC 2

910 F2NI 902 F2NM 224 234 244 National 2

910 F2CI 902 F2CM 225 235 245 Counter 2

910 F2SI 902 F2SM 226 236 246 Sync 2

910 F1HI 902 F1HM 123 133 143 HDLC 1

910 F1NI 902 F1NM 124 134 144 National 1

910 F1CI 902 F1CM 125 135 145 Counter 1

910 F1SI 902 F1SM 126 136 146 Sync 1

910 F0HI 902 F0HM 023 033 043 HDLC 0

910 F0NI 902 F0NM 024 034 044 National 0

910 F0CI 902 F0CM 025 035 045 Counter 0

910 F0SI 902 F0SM 026 036 046 Sync 0

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15.5 E1 Interrupt Source an d Interrupt Status Register Summary

Register Interrupt Description Address Bit Name Address Bit Name Y10 RCRCR Y34 RCRCRI S Y N C remote CRC-4 and RAI occurred Y10 RSLP Y34 RSLPI receive slip occurred Y12 Y Y34 YI remote multiframe sync fail occurred Y12 AUXP Y34 AUXPI auxiliary pattern occurred Y12 RAI Y34 RAII remote alarm occurred Y12 AIS Y34 AISI alarm indication signal occurred Y12 AIS16 Y34 AIS16I alarm indication signal on channel 16 occurred Y12 LOSS Y34 LOSSI loss of signal occurred Y10 RCRC0 Y34 RCRC0I remote CRC-4 sync and RAI for 10 ms and up occurred Y10 RCRC1 Y34 RCRC1I remote CRC-4 sync and RAI for 10 ms to 450 ms occurred Y10 CEFS Y34 CEFSI consecutive errored FAS’s occurred Y10 RFAIL Y34 RFAILI remote CRC-4 multiframe generat or/detector failure occurred Y10 CSYNC Y34 CSYNCI loss of CRC-4 sync occurred Y10 MSYNC Y34 MSYNCI loss of multiframe sync occurred Y10 BSYNC Y34 BSYNCI loss of basic frame sync occurred Table 52 - Interrupt Source & Status Register Summary (E1)

Zarlink Semiconductor Inc. Y16 SL15-0 Y35 SLOI C O U N T E R loss of basic frame sync counter overflowed Y1A FEC7-0 Y35 FEOI frame alignment signal (FAS) error counter overflowed Y1A FEC7-0 Y35 FEII frame alignment signal (FAS) error occurred Y1A BEC7-0 Y35 BEOI frame alignment signal (FAS) bit error counter overflowed Y1A BEC7-0 Y35 BEII frame alignment signal (FAS) bit error occurred Y19 CEC15-0 Y35 CEOI CRC-4 error counter overflowed Y19 CEC15-0 Y35 CEII CRC-4 error occurred Y18 VEC15-0 Y35 VEOI bipolar violation error counter overflowed Y18 VEC15-0 Y35 VEII bipolar violation error occurred Y17 EEC15-0 Y35 EEOI E-bit error counter overflowed Y17 EEC15-0 Y35 EEII E-bit error occurred Y15 PCC7-0 Y35 PCOI PRBS CRC-4 multiframe counter overflowed Y15 PEC7-0 Y35 PEOI PRBS error counter overflowed Y15 PEC7-0 Y35 PEII PRBS error occurred Real Time Source Status Register or PCM30 Interrupt Status Register Interrupt Description Address Bit Name Address Bit Name Table 52 - Interrupt Source & Status Register Summary (E1)

Zarlink Semiconductor Inc. PCM30 Sa5 Y36 Sa5VI N A T I O N A L Sa5 bit value was one when Sa6N8 toggled from zero to one PCM30 Sa6 Y36 Sa6V3I Sa6 bit 3 value was one when Sa6N8 toggled from zero to one PCM30 Sa6 Y36 Sa6V2I Sa6 bit 2 value was one when Sa6N8 toggled from zero to one PCM30 Sa6 Y36 Sa6V1I Sa6 bit 1 value was one when Sa6N8 toggled from zero to one PCM30 Sa6 Y36 Sa6V0I Sa6 bit 0 value was one when Sa6N8 toggled from zero to one PCM30 Sa6 Y36 Sa6N8I sequence of 8 identical Sa6 nibbles occurred PCM30 Sa6 Y36 Sa6NI Sa6 nibble changed PCM30 Sa5-8 Y36 SaNI Sa5,6,7 or 8 nibble changed PCM30 Sa5 Y36 Sa5TI Sa5 bit changed PCM30 Sa5-8 Y36 SaTI Sa5,6,7 or 8 bits changed Y70-Y8F ABCD Y36 CASRI receive CAS bit (ABCD) changed Y11 CALN Y36 CALNI CRC-4 2 ms timer toggled Y11 T2 Y36 T2I CRC-4 10ms timer toggled from zero to one Y11 T1 Y36 T1I CRC-4 100ms timer toggled from zero to one Y36 ONESECI 1s timer toggled from zero to one Real Time Source Status Register or PCM30 Interrupt Status Register Interrupt Description Address Bit Name Address Bit Name Table 52 - Interrupt Source & Status Register Summary (E1)

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16.0 JTAG (Joint Test Action Group) Operation

The MT9072 JTAG (Joint Test Action Group) interface conforms to the Boundary-Scan standard IEEE1149.1-1990. This standard specifies a design-for-testability technique called Boundary-Scan test ( BST). Figure 10 shows the BST architecture which is made up of the following four basic elements. See Figure 30 for JTAG timing. 1. Test Access Port (TAP) 2. TAP Controller 3. Instruction Register (IR) 4. Test Data Registers (TDR) Figure 10 - Boundary Scan Test Circuit Block Diagram

16.1 Test Access Port (TAP)

The Test Access Port (TAP) provides access to the many test functions of the MT9072. It consists of four input pins and one output pin. The following pins are from the TAP. Test Clock Input (TCK) - TCK provides the clock for the test logic. The TCK signal does not interfere with any on-chip clocks and thus remains independent. The TCK per mits shifting of test data into or out of the Boundary-Scan register cells co ncurrently with the operation of the devic e and without interferi ng with the on-chip logic. Test Mode Select Input (TMS) - The logic signals received at the TMS input are interpreted by the TAP Controller to control the test operations. The TMS signal is sampled at the rising edge of the TCK pulses. This pin is internally pulled up to device VDD when it is not driven from an external source. TDI TDO TMS TCK TRST TAP Instruction Register Bypass Register Device ID Register Test Data Registers Framer Input Pins Framer Output Pins Framer Core Logic Boundary Scan Register TAP Controller

Zarlink Semiconductor Inc. Test Data Input (TDI) - Serial input data applied to this port is fed either into the inst ruction register or into a test data register, depending on the sequence previously applied to the TMS input. Both registers are described in a subsequent section. The received input data is sampled at the rising edge of TCK pulses. This pin is internally pulled up to device VDD when it is not driven from an external source. Test Data Output (TDO) - Depending on the sequence previously appli ed to the TMS input, the contents of either the instruction register or data register are serially shifted out towards the TDO pin. The data out of TDO is clocked on the falling edge of the TCK pulses. When no data is shifted through the boundary sca n cells, the TDO driver is set to a high impedance state. Test Reset (TRST) - Reset the JTAG scan structure.

16.2 Test Access Port (TAP) Controller

The TAP Controller generates clock and control signals for the Instruction Register (IR) and the Test Data Registers (TDR’s). The TAP Controller operates synchronously with the TCK input clock and responds to the TMS input signal to generate control signals which shift, capture, or update data through either the IR or the TDR’s.

16.3 Instruction Register

The Instruction Register (IR) is a 3-bit register which allows one of four test instructions to be shifted into the device. Test instructions are serially loaded into the IR from th e TDI pin by the TAP Controller. Refer to Table 53 which describes the test instructions provided by the MT9072; these instructions ar e in accordance with the IEEE 1149.1 standard. MSB LSB Instruction Name Functional Description 0 0 0 EXTEST This instruction isolates the framer l ogic (on chip logic) from the input and output pins. The signal states at the output pins are determined by the values programmed (earlier) in the Boundary Scan Register. This instruction allows testing of board level interconnects (i.e., open, stuck at, bridge). 0 1 0 SAMPLE/PR ELOAD This instruction performs two functions. On the rising edge of TCK, the SAMPLE instruction is performed. With this instruction, the signal states at the input and output pins are loaded into the Boundary Scan Register. On the falling edge of TCK, the PRELOAD instruction is performed. With this instruction, the signal states at the output pins is determined by the values programmed (earlier) in the Boundary Scan Register. 0 0 1 IDCODE This instruction forces the value of the 32 bit MT9072 Identification Register into the Instruction Register’s parallel output latches. This is the default instruction loaded after a JTAG reset. 1 1 1 BYPASS This instruction connects the Bypass Register between the TDI and TDO pins. Note 1. The following optional JTAG instructions are not supported, INTEST, RUNBIST and USERCODE. Table 53 - JTAG Instruction Register

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16.4 JTAG Data Registers

As specified in IEEE 1149.1, the JTAG Interface must contain as a minimum the boundary scan register and the bypass register. The device identification register although optional, is also included in the MT9072.

16.4.1 Identification Register

This is a 32 bit register as defined in Table 54. Note that the part number revision is not the same as the silicon revision which is not supplied. Version Part Number Manufacturer Identity LSB=1 (4 bits) (16 bits) (11 bits) (1 bit) A 9072 Zarlink LSB=1 0000 1001 0000 0111 0010 0001 0100 101 1 0 9 0 7 2 14B 0 9 0 7 2 1 4 B Table 54 - JTAG MT9072 Identification Register

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17.0 MT9072 Register Set

17.1 T1 Register Set

17.1.1 Register Address (000 - FFF) Summaries

17.1.1.1 Framer Address (0XX-9XX) Summary

(A11-A0) Hex Address Framer Accessed 000 xxxx xxxx 0XX 0 001 xxxx xxxx 1XX 1 010 xxxx xxxx 2XX 2 011 xxxx xxxx 3XX 3 100 xxxx xxxx 4XX 4 101 xxxx xxxx 5XX 5 110 xxxx xxxx 6XX 6 111 xxxx xxxx 7XX 7 1000 xxxx xxxx 8XX 0,1,2...7 (reserved for writes only) 1001 0000 xxxx 90X Global control Registers for the MT9072 1001 0001 xxxx 91X Global status Registers for the MT9072 1001 0010 xxxx 92X ST-BUS analyser buffer data 1001 0011 xxxx 93X ST-BUS analyser buffer data xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities Table 55 - Framer Addressing (0XX - 9XX) (T1)

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17.1.1.2 Register Group Address (Y00 - YFF) Summary

(A11-A0) Hex Address Register Group Accessed Processor Access ST-BUS Access yyyy 0000 xxxx yyyy1111 xxxx Y0X YFX Master Control R/W --- yyyy 0001 xxxx Y1X Master Status R --- yyyy 0010 xxxx Y2X Latched Status R --- yyyy 0011 xxxx Y3X Interrupt Status R --- yyyy 0100 xxxx Y4X Interrupt Mask R/W --- yyyy 0101 xxxx yyyy 0110 xxxx Y5X-Y6X Per Channel Tx signaling R/W yes yyyy 111 xxxx yyyy 1000 xxxx Y7X-Y8X Per Channel Receive signaling R/W yes yyyy 1001 xxxx yyyy 1010 xxxx Y9X-YAX Per Channel Control R/W --- yyyy 1011 xxxx yyyy 1100 xxxx YBX-YCX not used yyyy 1101 xxxx yyyy 1110 xxxx YDX-YEX not used xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities yyyy indicates 9 (000, 001, 010, 011, 111,1000,1001) binary possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) and global selection. Y indicates 9 (0,1,2,3,4...9) hex possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only), and global selection. Table 56 - Register Group Address (Y00 - YFF) Summary (T1)

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17.1.1.3 Global Control and Status Register (900-91F) Summary

(A11-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) 1001 0000 0000 900 R/W Global Control0 T1Eo, STBUS ,#,#,#,#,#,#,#,#,#,CK1,#,#,#,RSTC 1001 0000 0001 901 R/W Global Control1 CHANNUM(4:0),STRNUM(4:0),STBUFEN,FRNUM(2:0), CHUP,CONTSIN 1001 0000 0010 902 R/W Interrupt Vector Mask Register F3HM,F3EM, F3RM, F3SM,F2HM, F2EM, F2RM, F2SM, F1HM,F1EM, F1RM, F1SM,F0HM, F0EM, F0RM, F0SM 1001 0000 0011 903 R/W Interrupt Vector Mask Register F7HM,F7EM, F7RM, F7SM,F6HM, F6EM, F6RM, F6SM, F5HM,F5EM, F5RM, F5SM,F4HM, F4EM, F4RM, F4SM 1001 0000 0100 904 R/W Framer Loopback Global Register SLBK8, SLBK67, SLBK45, SLBK23, SLBK01,RLBK8, RLBK67, RLBK45, RLBK23, RLBK01,#, #, #,#,#,# 1001 0000 0110- 1001 0000 1111 906-90F R/W not used not used 1001 0001 0000 910 R Interrupt Vector Status 0 F3HVS,F3EVS, F3RVS, F3SVS,F2HVS, F2EVS, F2RVS, F2SVS, F1HVS,F1EVS, F1RVS, F1SVS,F0HVS, F0EVS, F0RVS F0SVS 1001 0001 0001 911 R Interrupt Vector Status1 F7HVS,F7EVS, F7RVS, F7SVS,F6HVS, F6EVS, F6RVS, F6SVS, F5HVS,F5EVS, F5RVS, F5SVS,F4HVS, F4EVS, F4RVS F4SVS 1001 0001 0010 912 R Identification Code Status ID15-0 1001 0001 0011 913 R ST-Bus Analyser Interrupt Vector Register 1001 0001 0100- 1001 0001 1111 914-91F not used 1001 0010 0010 1001 0011 1111 920-93F R ST-Bus Analyser Data 1001 0100 0100 1001 1111 1111 940-9FF not used # indicates unused bits in register that may be any value if read Table 57 - Global Control and Status (900 - 91F) Summary (T1)

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17.1.1.4 Master Control Registers Address (Y00-Y0F, YF0 to YFF) Summary

(A11-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) yyyy 0000 0000 Y00 R/W Framing Mode Select Interface IMA,#,G.802,JYEL,TRANSP,T1DM,ESF, #, CXC, RS1-0, FSI, REFR, MFREFR, JTS, TXSYNC yyyy 0000 0001 Y01 R/W Line Coding Word #,#,#, #,RZCS1,RZCS0,TZCS2,TZCS1,TZCS0,TPDV ,TXB8ZS,RXB8ZS,ADSEQ,RZNRZ, UNIBI, CLKE yyyy 0000 0010 Y02 R/W Tx Alarm Control Word #, #,#,#,#,#,#,#,TESFYEL,TXSECY,TD4YEL,TAIS, #,TT1DMY,D4SECY,SO yyyy 0000 0011 Y03 R/W Tx Error Control Word #, #,#,#,#,#,#,#,#,L32Z,BPVE,CRCE,FTE,FSE,LOSE, PERR yyyy 0000 0100 Y04 R/W signaling Control Word #,#,#,#,#,#,CSIGEN,RBEN,#,RSDB,RFL,#, SM1-0,SIP1-0 yyyy 0000 0101 Y05 R/W Loopback Control Word #,#,#,#,#,#,#,#,#,DLBK,RLBK,STLBK,PLBK,TLU,TL D yyyy 0000 0110 Y06 R/W HDLC &Datalink Control Word #,#,#,#,HCH4:0,HPAYSEL,E1.5CK,DLCK,EDLEN, BOMEN, HDLCEN,H1R64 yyyy 0000 0111 Y07 R/W Tx BOM Regi ster #,#,#,#,#,#,#,#,TXBOM7:0 yyyy 0000 1000 Y08 R/W Rx BOM Register Match yyyy 0000 1001 Y09 R/W Receive Idle Code #,#,#,#,#,#,#,#,RXID7:0 yyyy 0000 1010 Y0A R/W Transmit Idle Code #,#,#,#,#,#,#,#,TXID7:0 yyyy 0000 1011 Y0B R/W Common Channel signaling Map yyyy 0000 1100 Y0C R/W not used yyyy 0000 1101 Y0D R/W Transmit Loopback Activate Code #,#,#,#,#,#,TXLACL1-0,TXLAC7-0 yyyy 0000 1110 Y0E R/W Transmit Loopback Deactivate Code yyyy 0000 1111 Y0F R/W Receive Loopback Activate Code #,#,#,#,#,#,RXLACL1-0,RXLACM7-0 yyyy 1111 0000 YF0 R/W Receive Loopback Deactivate Code #,#,#,#,#,#,RXLDCL1-0,RXLDCM7-0 yyyy 1111 0001 YF1 R/W Interrupts and I/O Control #,#,#,#,#,Tx8KEN,RxDO,TXMFSEL,SPND,INTA, DSToEn,CSToEn,RxCO,CNTCLR,SAMPLE,RST yyyy 1111 0010 YF2 R/W HDLC Control0 #,#,#,#,#,ADREC,RXEN,TXEN,EOP,FA,MI,CYCLE, TCRCI, SEVEN,RXFRST,TXFRST Table 58 - Master Control Registers Address (Y00 to Y0F and YF0 to YFF) Summary (T1)

Zarlink Semiconductor Inc. yyyy 1111 0011 YF3 R/W HDLC Test Control #,#,#,#,#,#,#,#,#,#.HRST,RTLOOP,CRCTST,FTST, ADTST,HLOOP yyyy 1111 0100 YF4 R/W Address Recognition ADRM26-20,A2EN,ADRM16-10,AEN yyyy 1111 0101 YF5 R/W TX FIFO #,#,#,#,#,#,#,#,TXFIFO7-0 yyyy 1111 0110 YF6 R/W TX Byte count #,#,#,#,#,#,#,#,CNT7-0 yyyy 1111 0111 YF7 R/W Transmit Set Delay Bits 7 - 0. yyyy 1111 1000 yyyy1111 1111 YF8- YFF not used not used xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities yyyy indicates 9 (000, 001, 010, 011, 111,1000,1001) binary possibilities representing 1 of 8 framers (R/W), all 8 framers (W only), and global selection. Y indicates 9 (0,1,2,3,4...9) hex possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) and global selection(R/W) Binary Address (A11-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) Table 58 - Master Control Registers Address (Y00 to Y0F and YF0 to YFF) Summary (T1)

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17.1.1.5 Master Status Registers Address (Y10-Y1F) Summary

(A11-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) yyyy 0001 0000 Y10 R Synchronization and Alarm Status Word #, #, TFSYNC,MFSYNC,SE,LOS,D4YALM,D4Y48, SECYEL,ESFYEL,AIS,PDV,LLED,LLDD,T1DRR, T1DRY yyyy 0001 0001 Y11 R Timer Status Word #, #,#,#,#,#,#,#,#,#,#,#,#,1SEC,2SEC,# yyyy 0001 0010 Y12 R Receive Bit Oriented Message #,#,#,#,#,#,RxBOM,RxBOMM,RxBOM7-0 yyyy 0001 1011 Y13 R Receive Slip Buffer Word #,#,PIR2:0,RSLPD,RXSLIP,RXFRM, RXTS4-0,RxBC2-0 yyyy 0001 0100 Y14 R Transmit Slip Buffer Word #,#,#,#,#,TSLIP,TSLPD,TXSBMSB, TXTS4-0,TXBC2-0 yyyy 0001 0101 Y15 R PRBS Error Counter and CRC Multiframe Counter for PRBS PSM7-0,PS7-0 yyyy 0001 0110 Y16 R MFOOF MFOOF15-0 yyyy 0001 0111 Y17 R Framing Bit ErrorCounter FC15-0 yyyy 0001 1000 Y18 R Bipolar Violation Counter BPV15-0 yyyy 0001 1001 Y19 R CRC-6 Error Counter CC15-0 yyyy 0001 1010 Y1A R OOF and COFA counter OOF7:0,COFA7:0 yyyy 0001 1011 Y1B R Excessive Zero Counter #,#,#,#,#,#,#,#,EXZ7:0 yyyy 0001 1100 Y1C R TX Byte Counter Position and HDLC Test Status #,#,#,#,RXclk,TXclk,Vcrc,Vaddr,TBP7:0 yyyy 0001 1101 Y1D R HDLC Status #,#,#, #,#,#,#,#,#,IDC,RQ9-8,TXSTAT1-0, RXSTA1-0 yyyy 0001 1110 Y1E R RX CRC CRC15-0 yyyy 0001 1111 Y1F R RX FIFO #,#,#,#,#,#,#,#,RXFIFO7-0 xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities yyyy indicates 9 (000, 001, 010, 011, 111,1000,1001) binary possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) Y indicates 9 (0,1,2,3,4...9) hex possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) Table 59 - Master Status Register(R) Address(Y1X) Summary (T1)

Zarlink Semiconductor Inc.

17.1.1.6 Latched Status Registers Address (Y20-Y2F) Summary

(A11-A0) Hex Address R/W Latched Status Register Status Bits (B15 - B8 / B7 - B0) yyyy 0010 0000- yyyy 0010 0010 Y20-Y22 - not used not used yyyy 0010 0011 Y23 R HDLC Status Latch #,#,#,#,#,#,#,GAL,EOPDL,TEOPL,EOPRL,TXFLL, FAL,TXUNDERL,RXFFL,RXOVFLL yyyy 0010 0100 Y24 R Receive Sync and Alarm Latch FEOL,CRCOL,OOFOL,COFAOL,BPVOL,PRBSOL ,PRBSMFOL,MFOOFOL,TFSYNL,MFSYNL,FBEL, COFAL,SEFL,AISL, CRCL,LOSL yyyy 0010 0101 Y25 R Receive Line status and Time Latch D4YALML,D4Y48L,SECYELL,ESFYELL,T1DMYL, #,BPVL,PRBSL,PDVL,LLEDL,LLDDL,RXBOML, RXBOMML,CASRL,1SECL,2SECL yyyy 0010 0110 Y26 R Elastic Store and Excessive zero Latch RXSLIPL yyyy 0010 0111 Y27 R not used yyyy 0010 1000 Y28 R Framing Bit Error Counter Latch FCL<15:0> yyyy 0010 1001 Y29 R Bipolar Violation Error Counter Latch BPVL<15:0> yyyy 0010 1010 Y2A R CRC-6 Error Counter Latch CRCL<15:0> yyyy 0010 1011 Y2B R Out of Frame and Change of Frame Count Latch OOFL<7:0>,COFAL<7:0> yyyy 0010 1100 Y2C R Multiframe Out of Frame Count Latch MFOOFL<15:0> yyyy 0010 1101 yyyy 0010 1111 Y2D- Y2F not used xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities yyyy indicates 9 (000, 001, 010, 011, 111,1000,1001) binary possibilities representing 1 of 8 framers (R/W), all 8 framers (W only) and global selection. Y indicates 9 (0,1,2,3,4...9) hex possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) and global selection. Table 60 - Latched Status Register (R) Address (Y2X) Summary (T1)

Zarlink Semiconductor Inc.

17.1.1.7 Interrupt Status Registers Address (Y30-Y3F) Summary

(A11-A0) Hex Address R/W Interrupt Status Register Status Bits (B15 - B8 / B7 - B0) yyyy 0011 0000 yyyy 0011 0010 Y30-Y32 - not used not used yyyy 0011 0011 Y33 R HDLC Interrupt Status #,#, #,#,#,#,#,GAI,EOPDI,TEOPI,EOPRI,TXFLI,FA, TXUNDERI,RXFFI,RXOVFLI yyyy 0011 0100 Y34 R Receive Sync and Alarm Interrupt Status FEOI,CRCOI,OOFOI,COFAOI,BPVOI,PRBSOI,PR BSMFOI,MFOOFOI,TFSYNI,MFSYNI,FBEI,COFA, SEFI,AISI,CRCI,LOSI yyyy 0011 0101 Y35 R Receive Line and Timer Interrupt Status D4YALMI,D4Y48I,SECYELI,ESFYELI,T1DMYI,#, BPVI,PRBSI,PDVI,LLEDI,LLDDI,BIOMI,BOMMI, CASRI,1SECI,2SECI yyyy 0011 0110 Y36 R Elastic Store and Excessive Zero Interrupt Status RXSLIPI yyyy 0011 0111- yyyy 0011 1111 Y37-Y3F not used not used xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities yyyy indicates 9 (000, 001, 010, 011, 111,1000,1001) binary possibilities representing 1 of 8 framers (R/W), all 8 framers (W only) and global selection. Y indicates 9 (0,1,2,3,4...9) hex possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) and global selection. Table 61 - Interrupt Status Register (R) Address (Y3X) Summary (T1)

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17.1.2 Interrupt Mask Registers Address (Y40-Y4F) Summary

17.1.3 Master Control Regi sters (Y00 to YF0 ) Bit Functions

Tables 64 to 79 describe the bit function s of each of the Master Control Registers in the MT9072. Each register is repeated for each of the 8 framers. Framer 0 is addresse d with Y=0, Framer 1 with Y=1, Framer 2 with Y=2,... Framer 7 with Y=7 (where Y represents t he 4 most significant address bits (MSB) A 11 A10 A9 A8). In addition, a simultaneous write to all 8 Framers is possible by setting t he address A11 to 1 and A10 to A8 to 0. A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a hard reset (the RESET pin is toggled from zero to one), or a software reset (the RST bit in control register address YF1 is toggled from one to zero or toggling of RSTC in Global Control Register). The (#) indicates that a (0) or (1) is possible. Binary Address (A11-A0) Hex Address R/W Interrupt Mask Register Control Bits (B15 - B8 / B7 - B0) yyyy 0010 0000- yyyy 0010 0010 Y40-Y42 - not used not used yyyy 0100 0011 Y43 R HDLC Interrupt Mask #,#, #,#,#,#,#,GAIM,EOPDIM,TEOPIM,EOPRIM, TXFLIM,FAIM,TXUNDERIM,RXFFIM,RXOVFLIM yyyy 0100 0100 Y44 R Receive Sync and Alarm Interrupt Mask FEOIM,CRCOIM,OOFOIM,COFAOIM,BPVOIM, PRBSOIM,PRBSMFOIM,MFOOFOIM,TFSYNIM, MFSYNIM,FBEIM,COFAIM,SEFIM,AISIM,CRCIM, LOSIM yyyy 0100 0101 Y45 R Receive Line status and Timer Interrupt Mask D4YALMIM,D4Y48IM,SECYELIM,ESFYELIM, T1DMYIM,#,BPVIM,PRBSIM,PDVIM,LLEDIM, LLDDIM,BIOMIM,BOMMIM,CASRIM,1SECIM,2SE CIM yyyy 0100 0110 Y46 R Elastic Store and Excessive Zero Interrupt Mask RXSLIPIM yyyy 0100 0111 yyyy 0100 1111 Y47-Y4F R not used not used xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities yyyy indicates 9 (000, 001, 010, 011, 111,1000,1001) binary possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) and global selection. Y indicates 9 (0,1,2,3,4...9) hex possibilities representing 1 of 8 framers (R/W), and all 8 framers (W only) and global selection. Table 62 - Interrupt Mask Register (R/W) Address (Y4X) Summary (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description

15 IMA

(0) Inverse Mux for ATM Mode. Setting this bit high allows the IO port to be easily connected to one of the Zarlink IMA devices such as MT90220. DSTi becomes a serial 1.544 Mb/s data stream. C4b becomes a 1.544 MHz clock that clocks DSTi in on the falling edge. RXFPB becomes a positive framing pulse that is high for the first bit of the serial T1 stream coming from the DSTo pin. The data from DSTo is clocked out on the rising edge of RXDLC. Set this pin low for all other applications. Note that signaling operations CSTi/CSTo do not function in the IMA Mode. The Global Control Register 900 bit CK1 is ignored for this mode. 8.192 Mbit/s backplane mode is not supported if IMA mode is selected on any of the framer’s. 14 # not used. 13 G.802 (0) G802 Mode. If set, this bit maps DSTi data channels transparently onto the transmit line data and maps the receive data onto DSTo channels as per G.802.

12 JYEL

(0) Japan Yellow Alarm Set this bit high to select a pattern of 16 ones (111111111111111) as the ESF yellow alarm. In order to transmit the japan yellow alarm the TESFYEL bit has to be set.

11 TRANSP

(0) Transparent Mode Select. In transparent Mode the data present at the DSTi channels are transparently sent to the T1 interface. The S bit from the DSTi interface (Channel 31 if running at 2.048 Mb/s backplane) is sent to the S bit position of the T1 interface.The rest of the channelized data is sent unaltered to the T1 interface. Ensure that TCPI of per channel controlis not set.

10 T1DM

(0) T1DM Mode Select. Set this bit high to select T1DM Mode. In T1DM the Ft and Fs pattern is the same as the D4 Mode but a 1011YR0 pattern is sent and detected in Channel 24 of the T1 interface. Bit Y is used to indicate a yellow Alarm and R bit is used by AT&T for a 8 Kb/s communication channel.

9 ESF

(0) Extended Super Frame. Setting this bit enables transmission and reception of the 24 frame superframe DS1 protocol. 8 (0) not used. 7C X C (0) Cross Check. Setting this bit in ESF mode enables a cross check of the CRC-6 remainder before the frame synchronizer pulls into sync. This process adds at least 6 milliseconds to the frame synchronization time. 6-5 RS1-0 (00) Reframe Select 1 - 0. These bits set the criteria for an automatic reframe in the event of framing bits errors. The combinations available are: RS1 - 0, RS0 - 0 = sliding window of 2 errors out of 4 frames. RS1 - 0, RS0 - 1 = sliding window of 2 errors out of 5 frames. RS1 - 1, RS0 - 0 = sliding window of 2 errors out of 6 frames. RS1 - 1, RS0 - 1 = no reframes due to framing bit errors. Note that for T1DM mode, the definition of frame boundary is starting from the channel 1 data including the synchronization byte(10111YR0) and the following’ S’ bit. The Y and the R bits are ignored for synchronization. 4F S I (0) Fs Bit Include. Only applicable in D4 mode. Setting this bit causes errored Fs bits to be included as framing bit errors. A bad Fs bit will increment the Framing Error Bit Counter, and will potentially cause a reframe. The Fs bit of the receive frame 12 will only be included if D4SECY is set. Note that when FSI bit is set both Ft and Fs are taken into consideration before declaration of synchronization 3R E F R (0) Reframe. A 0 to 1 transition of this bit causes an automatic reframe. Table 63 - Framing Mode Select (R/W Address Y00) (T1)

Zarlink Semiconductor Inc. 2M F R E F R (0) MultiFrame Reframe. Only applicable in D4 mode. Setting this bit causes an automatic multiframe reframe. The signaling bits are frozen until multiframe synchronization is achieved. Terminal frame synchronization is not affected. 1J T S (0) Japan Telecom Synchronization. If this bit is set, the S-bit is included in the CRC6 calculation for the ESF framing Mode.

0 TxSYNC

(0) Transmit Synchronization. Setting this bit causes the transmit multiframe boundary to be internally synchronized to the incoming S-bits on DSTi channel 31 bit 0. Bit Name Functional Description Table 63 - Framing Mode Select (R/W Address Y00) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-12 # not used. 11-10 RZCS1-0 (00) Receive Zero Code Suppression. 00: No Zero Code Suppression. 01: GTE Zero Code Suppression 00000001 of an byte is detected and replaced by a 00000000 10: DDS Zero Code Suppression.10011000 is detected as a zero byte and replaced by 00000000. 11: Bell Zero Code Suppression (Bit 7,00000010) is detected as a zero byte and replaced by a zero byte. These suppression detection codes only apply to the receiver. Note that the bit designations are with respect to the PCM24 side where bit 1 is sent and received first. 9-7 TZCS2-0 (000) Transmit Zero Code Suppression. 000: No Zero Code Suppression. 001: GTE Zero Code Suppression. Bit 8 of an all zero channel byte is replaced by a one, except in signaling frames where bit 7 is forced to a one. 010: DDS Zero Code Suppression. An all zero byte is replaced by 10011000. 011: Bell Zero Code Suppression. Bit 7 of an all zero channel is replaced by a 00000010, 100: "Jammed bit 8". Bit 8 of all channels are replaced by a 1. These suppression codes only apply to the transmitter. Note that if a suppression code is enabled for a channel the B8ZS coding will not take place for the channel. Although 8 consecutive zeros in a non channel boundary will be subjected to B8ZS suppression. Note that the bit designations are with respect to the PCM24 side where bit 1 is sent and received first. 6T P D V (0) Transmit PDV. The output of the T1 data to be sent is monitored over a T1 frame and if the density is less than 12.5% a bit is added, in the non-framing bit.

5 TXB8ZS

(0) Transmit Bipolar Eight Zero Substitution. If set all zero octets in the transmit path are substituted with B8ZS codes.

4 RXB8ZS

(0) Receive Bipolar Eight Zero Substitution. If set B8ZS code words in the receive path are substituted with all zero octets. Bipolar violations assosciated with incoming B8ZS words will not be counted by the Bipolar Violation Error Counter.

3 ADSEQ

(0) Digital Milliwatt or Digital Test Sequence. If one, the Mulaw digital milliwatt analog test sequence will be selected for those channels with per timeslot control bits TTST, RRST set. If zero, a PRBS generator / detector will be connected to channels with TTST, RRST set.

2 RZNRZ

(0) Return to zero Non Return to zero. If one return to zero inputs and outputs are expected at the T1 interface. If zero, Non return to zero input and output are expected. RZ mode is only supported for bipolar input.

1 UNIBI

(0) Unipolar/Bipolar. If one the input and output at the T1 interface is assumed to be unipolar. The stream RPOS is the input and TPOS is the output. Setting this bit low causes the MT9072 to accept complementary bipolar inputs on RPOS/RNEG and to transmit complementary outputs on TPOS/TNEG. 0C L K E (0) Clock Edge. If one then the NRZ data(RPOS/RNEG) is sampled on the rising edge and transmitted on the falling edge of TXCL. If this bit is 0, then the opposite edges are used.This selection is only applicable in NRZ mode. Table 64 - Line Interface and Coding Word(Y01) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-8 # not used.

7 TESFYEL

(0) Transmit ESF Yellow Alarm. Setting this bit(while in ESF Mode) causes a repeating pattern of eight 1’s followed by eight 0’s to be sent on the transmit FDL bits. When JYEL is set, all ones signal is sent on the FDL.

6 TXSECY

(0) Transmit Secondary Yellow Alarm. When set to 1, the S-bit for transmit frame 12 will to be set to 1.

5 TD4YEL

(0) Transmit D4 Yellow Alarm. When set, bit 2 of all DS0 channels are forced low. The definition of Bit 2 is in accordance with Figure 55.

4 T A I S

(1) Transmit All Ones. When low, this control bit forces a framed or unframed (depending on the state of Transmit Alarm Control bit 0) all ones to be transmit at TTIP and TRING. 3 # not used. 2T T 1 D M Y (1) Transmit T1DM Yellow Alarm. If this bit is 0 a T1DM yellow alarm is sent on bit 2 of the 24th timeslot.

1 D4SECY

(0) D4 Secondary Alarm. Set this bit for trunks employing the secondary Yellow Alarm. The Fs bit in the 12th frame will not be used for counting errored framing bits. If a one is received in the Fs bit position of the 12th frame a Secondary Yellow Alarm Detect bit will be set. 0S O (0) S-bit Override. If set, this bit forces the S-bits to be inserted as an overlay on any of the following alarm conditions: i) transmit all ones, ii) loop up code insertion, iii) loop down code insertion. Table 65 - Transmit Alarm Control Word(Y02) (T1) Bit Name Functional Description 15-7 # not used.

6 L32Z

(0) Digital Loss of Signal Selection. If one, the threshold for digital loss of signal is 32 successive zeros. If zero, the threshold is set to 192 successive zeros.

5 BPVE

(0) Bipolar Violation Error Insertion. A zero-to-one transition of this bit inserts a single bipolar violation error into the transmit DS1 data.

4 CRCE

(0) CRC-6 Error Insertion. A zero-to-one transition of this bit inserts a single CRC-6 error into the transmit ESF DS1 data. 3F T E (0) Terminal Framing Bit Error Insertion. A zero-to-one transition of this bit inserts a single error into the transmit D4 Ft pattern or the transmit ESF framing bit pattern (in ESF mode). 2F S E (0) Signal Framing Bit Error Insertion. A zero-to-one transition of this bit inserts a single error into the transmit Fs bits (in D4 mode only). 1L O S E (0) Loss of Signal Error Insertion. If one, the MT9072 transmits an all zeros signal (no pulses). Zero code suppression is overridden. If zero, data is transmitted normally.

0 PERR

(0) Payload Error Insertion. A zero - to - one transition of this bit inserts a single bit error in the transmit payload. Table 66 - Transmit Error Control Word(Y03) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-10 # not used. 9C S I G E N (0) Common Channel Signaling Enable. Setting this bit enables common channel signaling in conjunction with register Y0B. All other channels on the CSTo stream are tristate. Register Y0B defines the map between CST and PCM stream.

8 RBEN

(0) Robbed Bit Signaling Enable. Setting this bit multiplexes the AB or ABCD signaling bits into bit position 8 of all DS0 channels every 6th frame. Signaling is only sent in channels for which the CC bit in the per channel control word (Address Y90 - YA7) is set to 1. 7 not used 6R S D B (0) Receive Signaling Debounce. Setting this bit causes incoming signaling bits to be debounced for a period of 6 to 9 milliseconds before reporting on CSTo streams or in the Receive signaling Bits Registers.. 5R F L (0) Receive Signaling Freeze Due to Loss. If one, the receive signaling is frozen if a receive loss of signal is detected. The freeze is cleared upon clearance of Loss. 4 # not used. 3-2 SM1-0 (00) Signaling Message. These two bits are used to fill the vacant bit positions available on CSTo when the MT9072 is operating on a D4 trunk. The first two bits of each reporting nibble of CSTo contain the AB signaling bits. The last two will contain SM1 and SM0 (in that order). When the MT9072 is connected to ESF trunks four signaling bits (ABCD) are reported and the bits SM1-0 settings are ignored. 1-0 SIP1-0 Signaling Interrupt Period. These 2 bits determine the signaling Interrupt period due to the Receive signaling changes. This 2 bits determine the duration of the signaling interrupt bit CASRI(Y35). 00 2 Msec Period 01 8 Msec Period 10 16 Msec Period Table 67 - Signaling Control Word (Y04) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-6 # not used. 5D L B K (0) Digital Loopback. If one, then the digital streams (TPOS/TNEG) are looped to RPOS/RNEG. Data coming out of DSTo will be a delayed version of DSTi. Hence the data path is DSTi through the Transmitter to RPOS/RNEG and through the receiver to DSTo. 4R L B K (0) Remote Loopback. If one, then all timeslots received on RPOS/RNEG are connected to TPOS/TNEG on the DS1 side of the MT9072. If zero, then this feature is disabled. 3S T L B K (0) ST-BUS Loopback. If one, then the last bit in the frame and the first 24 timeslots of DSTi are connected to the last bit in the frame and the first 24 timeslots of DSTo on the ST-BUS side of the MT9072. If zero, then this feature is disabled. See Loopbacks section. 2P L B K (0) Payload Loopback. If one, then all timeslots received on RPOS/RNEG are connected to TPOS/TNEG on the ST-BUS side of the MT9072. Hence DSTo is looped back to DSTi. If zero, then this feature is disabled. Set the bit RxDO (YF1 bit 9) for the payload loopback data to appear at the transmitter output. 1T L U (0) TxLoopUp Code. If this bit is set inband line loopup code is sent. The loopup code to be sent is determined by the Tx Loopup Code register. Note that the receiver will detect either framed or unframed inband loop codes. 0T L D (0) TxLoopDown Code. If this bit is set inband line loopdown code is sent. The loopdown code to be sent is determined by the Tx LoopDown Code register. If both TLU and TLD are set TLD takes precedence. Table 68 - LoopBack Control Word (Y05) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-12 # not used. 11-7 HCH4-0 (0) HDLC Channel 4-0. This 5 bit number specifies the timeslot the HDLC will be attached to if enabled. Timeslot 0 is the first channel in the frame. Timeslot 23 is the last channel available in a T1 frame. If enabled in a channel, HDLC data will be substituted for data from DSTi on the transmit side. Receive data is extracted from the incoming line data before the elastic buffer.

6 HPAYSEL

(0) HDLC Payload Select. Set this bit to 1 to attach HDLC to a payload timeslot, if zero it is attached to the Facility Data Link when in the ESF mode. 5 E1.5CK (0) Extracted 1.5 Data Link Clock. If one, the RxDLC pin outputs a 1.544 MHz clock signal derived from the 1.544 MHz clock signal at the EXCLi pin. This clock is synchronous with the receive data before it passes through the elastic buffer at the RxDL pin. If zero, the RxDLC pin operates as a receive data link clock or enable signal as programmed by control bit DLCK (register address Y06). 4D L C K (0) Data Link Clock. If one, the TxDLC and RxDLC pins output a gapped clock. If zero, the TxDLC and RxDLC pins output an active low enable signal. 3E D L E N (0) Enable Data Link. Setting this bit multiplexes the serial stream clocked in on pin TxDL into the FDL bit position (ESF mode) or the Fs bit position (D4 mode).

2 BOMEN

(0) Bit Oriented Message Enable. Setting this bit enables transmission of bit - oriented messages on the ESF facility data link. The actual message transmitted at any one time is contained in the Tx BOM register (Y07).

1 HDLCEN

(0) HDLC Enable. If this bit is set and HPAYSEL is a zero than the internal HDLC is connected to the FDL bits in ESF Mode and TXDL/RXDL are not used for the dataLink. If 0 the datalink is sourced/sinked from TXDL/RXDL.

0 H1R64

(0) HDLC Rate Select. Setting this bit high while the HDLC is activated on a timeslot enables 64 Kb/s operation. Setting this bit low while an HDLC is activated enables 56 Kb/s operation (this prevents data corruption due to forced bit stuffing). Table 69 - HDLC & DataLink Control Word(Y06) (T1) Bit Name Functional Description 15-8 # not used. 7-0 TXBOM 7-0 (0) Transmit Bit Oriented Message. The contents of this register are concatenated with a sequence of eight 1’s and continuously transmit in the FDL bit position of ESF trunks. Normally the leading bit (bit 7) and last bit (bit 0) of this register are set to zero. Note that in accordance to T1.403 Table 11 the codeword 7E should not be used due to similarity of DataLink idle code. Table 70 - Transmit Bit Oriented Message Register (Y07) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-8 # not used. 7-0 RXBOM M7-0 (0) Receive Bit Oriented Message Match. The contents of this register are compared to the received bit oriented message register(RXBOM) and an option maskable interrupt is generated if the contents match the received bit oriented message. Note that in accordance to T1.403 Table 11 the codeword 7E should not be used due to similarity of DataLink idle code. The code 7E will not be detected by the MT9072. Table 71 - Receive Bit Oriented Message Match Register(Y08) (T1) Bit Name Functional Description 15-8 # not used. 7-0 RXIDC 7-0 (0) Receive Idle Code. This is the idle code that is sent on the DSTo channels if the per timeslot control bit MPDR is set(Y90-YA7). Table 72 - Receive Idle Code Register(Y09) (T1) Bit Name Functional Description 15-8 # not used. 7-0 TXIDC 7-0 (0) Transmit Idle Code. This is the idle code that is sent on the PCM24 channels if the per timeslot control bit MPDT is set(Y90-YA7). Table 73 - Transmit Idle Code Register(Y0A) (T1) Bit Name Functional Description 15-10 # not used. 9-5 CST(4:0) (00000) CST Map Channel. This is the CSTi/o channel which will be used as a source/destination to be mapped to the PCM24 channel. The possible values are 0 to 23 for channels 0 to 23 of the CSTi/o streams. 4-0 PCM(4:0) (00000) PCM Map Channel. This is the PCM24 timeslot which will be used as a source/destination to be mapped to the CSTi/o channel. The possible values are 0 to 23 for timeslots 0 to 23 of the PCM24 stream. Table 74 - Common Channel Signaling Map Register(Y0B) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-10 # not used 9-8 TXLACL 1-0 (00) Transmit Loop Activate Code Length. These 2 bits define the length of the transmit loop up code. 00-Code length is 5 bits 01-Code length is 6 or 3 bits 10-Code length is 7 bits 11-Code length is 8 or 4 bits Note: if 3 bit code or 4 bit code is required the bits have to be repeated in TXLDC7-0. For instance if the code 1011 is desired, the TXLAC has to be set to 10111011 and the length TXLACL to 11. 7-0 TXLAC7-0 (0000 0001) Transmit Loop Activate Code. This byte specifies the inband loopup code to be transmitted. The default values are the T1.403 values for Loop Activate Code. Table 75 - Transmit Loop Activate Code Register(Y0D) (T1) Bit Name Functional Description 15-10 # not used 9-8 TXLDCL 1-0 (01) Transmit Loop Deactivate Code Length. These 2 bits define the length of the transmit loop down code. 00-Code length is 5 bits 01-Code length is 6 or 3 bits 10-Code length is 7 bits 11-Code length is 8 or 4 bits Note if 3 bit code or 4 bit code is required the bits have to be repeated in the TXLDC7-0. For instance if the code 1011 is desired, the TXLDC has to be set to 10111011 and TxDLCL to 11 7-0 TXLDC7-0 (0000 1001) Transmit Loop Deactivate Code. This byte specifies the inband loopdown code to be transmitted. If 001 is to be transmitted as a loopdown code; the register has to programmed to a value of XX001001and the length (TXLDL has to be 01).The default values are the T1.403 values for Loop Deactivate Code. Table 76 - Transmit Loop Deactivate Code Register(Y0E) (T1)

Zarlink Semiconductor Inc. Table 78 - Receive Loop Deactivate code Match Register (R/W Address YF0) Bit Name Functional Description 15-10 # not used 9-8 RXLACL 1-0 (00) Receive Loop Activate Code Length. These 2 bits define the length of the receive loop up code. 00-Code length is 5 bits 01-Code length is 6 or 3 bits 10-Code length is 7 bits 11-Code length is 8 or 4 bits Note: if 3 bit code or 4 bit code is required the bits have to be repeated in RXLACM7-0. For instance if the code 1011 is desired the RXLACM has to be set to 10111011 and the RXLACL to 11. In case of the 3 bit code the 2 most significant bits of RXLACM are ignored. 7-0 RXLACM 7-0 (0000 0001) Receive Loop Activate Code Match.This byte specifies the match code for the receive loopback activate code. A maskable interrupt can be generated if the loopback activate code message is received. This byte is compared to RXLAC. The default values are the T1.403 values for Loop Activate Code. Table 77 - Receive Loop Activate Code Match Register(Y0F) (T1) Bit Name Functional Description 15-10 # not used 9-8 RXLDCL 1-0 (00) Receive Loop Deactivate Code Length. These 2 bits define the length of the receive loop up code. 00-Code length is 5 bits 01-Code length is 6 or 3 bits 10-Code length is 7 bits 11-Code length is 8 or 4 bits Note: if 3 bit code or 4 bit code is required the bits have to be repeated in RXLACM7-0. For instance if the code 1011 is desired the RXLACM has to be set to 10111011 and the RXLACL to 11. In case of the 3 bit code the 2 most significant bits of RXLACM are ignored. 7-0 RXLDCM 7-0 (0000 0001) Receive Loop Deactivate Code Match.This byte specifies the match code for the receive loopback activate code. A maskable interrupt can be generated if the loopback activate code message is received. This byte is compared to RXLAC. The default values are the T1.403 values for Loop Activate Code.

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17.1.4 Master Status Registers(Y10-Y18)Bit Functions

Tables 80 to 95 describe the bit functi ons of each of the Master Status Regi sters in the MT9072. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2... and Framer 7 with Y=7 (where Y represents the 4 most significant address bits (MSB) A11A10 A9 A8). All status bits will power up in the inactive state until the event happens. Bit Name Functional Description 15-14 # not used 13 TFSYNC Terminal Frame Synchronization. Indicates the Terminal Frame Synchronization status (1 - loss; 0 - acquired). For ESF links terminal frame synchronization and multiframe synchronization are synonymous. This bit is also used for indicating T1DM sync gain or loss. 12 MFSYNC Multiframe Synchronization. Indicates the Multiframe Synchronization status (1 - loss; 0 -acquired). For ESF Mode multiframe synchronization and terminal frame synchronization are synonymous. MFSYNC is relevant in all T1 Modes. 11 SE Severely Errored Frame. This bit toggles when 2 of the last 6 received framing bits are in error. The framing bits monitored are the ESF framing bits for ESF links, a combination of Ft and Fs bits for D4 links (See Framing Mode Selection Word Y00) and T1DM Mode. 10 LOS Digital Loss of Signal. This bit goes high after the detection of 192 or 32 consecutive zeros dependent on the setting of L32Z bit. It returns low when the incoming pulse density exceeds 12.5%. 9D 4 Y A L M D4 Yellow Alarm. This bit is set if bit position 2 of virtually every DS0 channel is a zero for a period of 600 milliseconds. The alarm is tolerant of errors by permitting up to 16 ones in a 48 millisecond integration period. The alarm clears in 200 milliseconds after being removed from the line. The alarm will also clear if four 48 msec intervals are detected with more than 16 ones in bit position 2. 8D 4 Y 4 8 D4 Yellow Alarm - 48 Millisecond Sample. This bit is set if bit position 2 of virtually every DS0 channel is a zero for a period of 48 milliseconds. The alarm is tolerant of errors by permitting up to 16 ones in the integration period. This bit is updated every 48 milliseconds. 7 SECYEL Secondary D4 Yellow Alarm. This bit is set if 2 consecutive’1’s are received in the S-bit position of the 12th frame of the D4 superframe. 6 ESFYEL ESF Yellow Alarm. This bit is set if the ESF yellow alarm 0000000011111111 is received in eight or more codewords out of ten in the Bit oriented message location which are the FDL bits. 5A I S AIS Alarm. This bit is set if less than 5 zeros are received in a 3 millisecond window. The AIS bit is set to ahigh after power up. 4P D V Pulse Density Violation. This bit toggles if the receive data fails to meet ones density requirements. It will toggle upon detection of 16 consecutive zeros on the line data, or if there are fewer than N ones in a window of 8(N+1) bits - where N = 1 to 23. 3 LLED Line Loopback Enable Detect. This bit will be set when a framed or unframed repeating pattern of 00001 has been detected during a 48 millisecond interval. Up to fifteen errors are permitted per integration period. Note that the code detected is dependent on Receive Loopback Activate Code Match(Y0F). Table 79 - Synchronization and Alarm Status Word(Y10) (T1)

Zarlink Semiconductor Inc. 2L L D D (0) Line Loopback Disable Detect. This bit will be set when a framed or unframed repeating pattern of 001 has been detected during a 48 millisecond interval. Up to fifteen errors are permitted per integration period. Note that the code detected is dependent on Receive Loopback Deactivate Code Match (YF0).

1 T1DRR

(0) T1DM Received R bit. This bit is used for AT&T 8 KB/s communications channel. This bit will be received in bit 1 of timeslot 24 of the receive PCM24 stream in T1DM mode. 0T 1 D R Y T1DM Received Yellow Alarm. If this bit is 0 a T1DM yellow alarm has been detected in bit 2 of timeslot 24 of the receive PCM24 stream in T1DM mode. Bit Name Functional Description 15-3 # not used. 2 1SEC One Second Timer Status. This bit changes state once every 1 second. 1 2SEC Two Second Timer Status. This bit changes state once every 2 seconds and is synchronous with the 1 SEC timer. 0 # not used. Table 80 - Timer Status Word(Y11) (T1) Bit Name Functional Description 15-10 # not used. 9R x B O M Bit Oriented Message Received. This bit is set when a Received Bit Oriented Message is received. 8 RxBOMM Receive Bit Oriented Match. This bit is set if there is a match between the Received Bit Oriented Message and Receive Bit oriented Match register. 7 - 0 RxBOM7 - 0 Receive Bit Oriented Message. This is the bit oriented message received. This register is updated after 8 out of 10 messages are received. Table 81 - Receive Bit Oriented Message(Y12) (T1) Bit Name Functional Description Table 79 - Synchronization and Alarm Status Word(Y10) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-14 # not used. 13-11 PI2-0 Phase Indicator Bits (PI2 to PI0). These bits make up 3 least significant bits of a 12 bit word which indicate the delay through the receive slip buffer. The delay through the slip buffer in 2.048 Mhz bit cells is ( 512 - Phase Indicator bits). The delay to DSTo from the write into the slip buffer is ( 512 - Phase Indicator bits) + 16 bits. These bits are updated when the slip buffer write address is 0. These 3 bits will reflect the 1/2,1/4 and 1/8 fractions of the Phase Indicator Bits. 10 RSLPD Receive Slip Direction. If one, indicates that the last received frame slip resulted in a repeated frame, i.e., the system clock (C4b) is faster than network clock (EXCLi). If zero, indicates that the last received frame slip resulted in a lost frame, i.e., system clock slower than network clock. Updated on an RSLIP occurrence basis. 9R x S L I P Receive Slip. A change of state (i.e., 1-to-0 one 0-to-1) indicates that a receive controlled frame slip has occured. 8R x F R M Receive Frame. The most significant bit of the phase status word. If one, the delay through the receive elastic buffer is greater than one frame in length; if zero, the delay through the receive elastic buffer is less than one frame in length. 7-3 RxTS4 - 0 Receive Timeslot. A five bit counter that indicates the number of timeslots between the receive elastic buffer internal write frame boundary and the ST-BUS read frame boundary. The count is updated every 250 uS. 2-0 RxBC2 - 0 Receive Bit Count. A three bit counter that indicates the number of ST-BUS bit times there are between the receive elastic buffer internal write frame boundary and the ST-BUS read frame boundary. The count is updated every 250 uS. Table 82 - Receive Slip Buffer Status Word(Y13) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-11 # not used. 10 TSLIP Transmit Slip. A change of state (i.e., 1-to-0 or 0-to-1) indicates that a transmit controlled frame slip has occurred in the transmitter. 9 TSLPD Transmit Slip Direction. If one, indicates that the last transmit frame slip resulted in a repeated frame, i.e., the internally generated 1.544 MHz. transmit clock is faster than the system clock (C4b). If zero, indicates that the last transmit frame slip resulted in a lost frame, i.e., the internally generated 1.544 MHz. transmit clock is slower than network clock. Updated on an TSLIP occurrence. 8 TxSBMSB Transmit Slip Buffer MSB. The most significant bit of the Transmit Slip Buffer Delay Word. If one, the delay through the transmit elastic buffer is greater than one frame in length; if zero, the delay through the transmit elastic buffer is less than one frame in length. This bit is reset whenever Transmit Set Delay Bits (register address YF7) - are written to. 7-3 TxTS4 - 0 Transmit timeslot. A five bit counter that indicates the number of ST-BUS timeslots between the transmit elastic buffer ST-BUS write frame boundary and the internal transmit read frame boundary. The count is updated every 250 uS. 2-0 TxBC2 - 0 Transmit Bit Count. A three bit counter that indicates the number of ST-BUS bit times there are between the transmit elastic buffer ST-BUS write frame boundary and the internal read frame boundary. The count is updated every 250 uS. Table 83 - Transmit Slip Buffer Status Word(Y14) (T1) Bit Name Functional Description 15-8 PSM7-0 PRBS Multiframe Counter.This counter is incremented for each received CRC multiframe. It is cleared when the PRBS Error Counter is written to. 7-0 PS7-0 PRBS Error Counter.This counter is incremented for each PRBS error detected on any of the receive channels connected to the PRBS error detector. Table 84 - PRBS Error Counter and CRC Multiframe Counter for PRBS(Y15) (T1) Bit Name Functional Description 15-0 MFOOF15-0 (1) Multiframes Out of Synchronization Counter. This 16 bit counter will be incremented once for every multiframe (1.5 milliseconds in D4 mode, 3 milliseconds in ESF mode) in which basic frame synchronization is lost. This counter presets to one upon reset. If terminal frame synchronization is neverobtained, the MFOOF counter will keep incrementing every 1.5 or 3 msec (ESF Mode) Table 85 - Multiframe Out of Frame Counter(Y16) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-0 FC15 - 0 Framing Bit Error Counter. This 16 bit counter will be incremented for each error in the received framing pattern. In ESF mode the ESF framing bits are monitored. In D4 mode the counter reflects the combination of Ft and Fs errors. The count is only active if the Framer is in synchronization. Table 86 - Framing Bit Error Counter(Y17) (T1) Bit Name Functional Description 15-0 BPV15-0 BPV Counter. 16 bit counter that is incremented for every bipolar violation error received. Table 87 - Bipolar Violation Counter(Y18) (T1) Bit Name Functional Description 15-0 CC15-0 CRC-6 Error Counter Bits 15 to Zero. These are the 16 bits of the CRC-6 error counter. This is only relevant in the ESF Mode. This counter increments for every CRC-6 error. Table 88 - CRC-6 Error Counter(Y19) (T1) Bit Name Functional Description 15-8 OOF7 - 0 Out Of Frame Counter. This eight bit counter is incremented with every loss of receive frame synchronization. Hence if you loss sync, gain sync and loss it again the counter will have a value of 2. 7-0 COFA7 - 0 Change of Frame Alignment Counter. This eight bit counter is incremented if a resynchronization is done which results in a shift in the frame alignment position. Table 89 - Out of Frame and Change of Frame Counters(Y1A) (T1) Bit Name Functional Description 15-8 # not used. 7 - 0 EXZ7-0 Excessive Zero Counter. This counter is incremented once for detection of 8 or more zeros if B8ZS is turned on. This counter is incremented once if 16 or more zeros are detected if B8ZS is turned off. This counter counts groups of 8 or more or 16 or more zeros separated by ones. Table 90 - Excessive Zero Counters(Y1B) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-12 # not used.

11 RXclk This bit represents the receiver clock gener ated after the RXEN control bit, but before

zero deletion is considered.

10 TXclk This bit represents the transmit clock gener ated after the TXEN control bit, but before zero

insertion is considered. 9 Vcrc This is the CRC recognition status bit for the receiver. Data is clocked into the register and then this bit is monitored to see if comparison was successful (bit will be high). 8 Vaddr This is the address recognition status bit fo r the receiver. Data is clocked into the Address Recognition Register and then this bit is monitored to see if comparison was successful (bit will be high). 7-0 TBP7-0 Transmit Byte Counter Position. These 7 bits provide the position of the Transmit HDLC Byte Counter register (YF6). The counter is decremented as a byte of data is sent through the Transmit FIFO. When this register reaches the count of one, the next write to the Tx FIFO will be tagged as an end of packet byte. The counter decrements at the end of the write to the Tx FIFO. If the Cycle bit of YF2 is set high, the counter will cycle through the programmed value continuously. Table 91 - Transmit Byte Counter Position and HDLC Test Status(Y1C) (T1) Bit Name Functional Description 15-7 # not used. 6I D C Idle Channel State.Is set to a 1 when an idle Channel state (15 or more ones) has been detected at the receiver. This is an asynchronous event. On power reset, this may be 1 if the clock (RXC) was not operating. Status becomes valid after the first 15 bits or the first zero is received. 5-4 RQ9-8 RQ9-8Byte Status bits from RX FIFO. These bits determine the status of the byte to be read from RX FIFO as follows:

00 Packet Byte

01 First Byte

10 Last byte of good packet

11 Last byte of bad packet

3-2 TXSTAT1-0 Transmit FiFO Status: 00 Transmit FIFO is full.

01 The number of bytes in the transmit FIFO has reached or exceeded the 16 bytes

10 Transmit FIFO is empty

11 The number of bytes in the TX FIFO is less than the 16 byte threshold. 1-0 RXSTAT1-0 Receive FiFO Status: 00 Receive FIFO is empty.

01 The number of bytes in the Receive FIFO are less than the 16 bytes

10 Receive FIFO is full

11 The number of bytes in the Receive FIFO is greater than or equal to the 16 byte

threshold. Table 92 - HDLC Status Word(Y1D) (T1)

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17.1.5 Latched Status Regi sters (Y20 - Y2F) Bit Functions

Tables 96 and 103 describe the bit functions of each of t he Latched Status Registers in the MT9072 for T1. Each register is repeated for each of the 8 fr amers. Framer 0 is addressed with Y= 0, Framer 1 with Y=1, Framer 2 with Y=2 ... and Framer 7 with Y=7 (w here Y represents the 4 most si gnificant address bits (MSB) A 11,A10 A9 A8). All latched status registers will be reset in the inactive state upon reset. Bit Name Functional Description 15-0 RCRC15-0 Received CRC. This register contains the CRC received from the transmitter. These bits are as the transmitter sent them, the LSB of the FCS sequence is MSB in this register. This register is updated at the end of each received packet and therefore should be read when end of packet is detected. Table 93 - HDLC Receive CRC(Y1E) (T1) Bit Name Functional Description 7-0 RXFIFO7-0 Receive FIFO.This is the received data byte read from the RX FIFO. The status bits of this byte can be read from the status register. The FIFO status is not changed immediately when a write or read occurs. It is updated after the data has settled and the transfer to the last available position has finished. Note that if the HDLC receiver is connected to an receive T1 channel, the bit that arrived first is stored in the least significant bit of the receive FIFO. Table 94 - Receive FIFO(Y1F) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-9 # not used. 8G A L Go Ahead received Latch. Indicates a go-ahead pattern (01111111) was detected by the HDLC receiver. This bit is cleared after a read of Y23 or Y33. 7E O P D L End of Packet Data Latch. This bit is set when an end of packet (EOP) byte was written into the RX FIFO by the HDLC receiver. This can be in the form of a flag, an abort sequence or as an invalid packet. This bit is cleared after a read of Y23 or Y33. 6 TEOPL Transmit End of Packet Latch. This bit is set when the transmitter has finished sending the closing flag of a packet or after a packet has been aborted. This bit is cleared after a read of Y23 or Y33. 5E O P R L End of Packet received latch. This bit is set when the byte about to be read from the RX FIFO is the last byte of the packet. It is also set if the Rx FIFO is read and there is no data in it. This bit is cleared after a read of Y23 or Y33. 4T X F L L Transmit Fifo Low Latch. This bit is set when the Tx FIFO is emptied below the 16 byte low threshold level. This bit is cleared after a read of Y23 or Y33. 3F A L Framer Abort Latch. This bit (FA) is set when a frame abort is received during packet reception. It must be received after a minimum number of bits have been received (26) otherwise it is ignored.This bit is cleared after a read of Y23 or Y33. 2 TxunderL Txunder Latch. This bit is set for a TX FIFO underrun indication. If high it indicates that a read by the transmitter was attempted on an empty Tx FIFO. This bit is cleared after a read of Y23 or Y33. 1R x f f L Receive Fifo Full Latch. This bit is set when the Rx FIFO is filled above the 16 byte full threshold level. This bit is reset after a read.This bit is cleared after a read of Y23 or Y33. 0R X O v f l Receive Overflow Latch. Indicates that the 32 byte RX FIFO overflowed (i.e. an attempt to write to a 32byte full RX FIFO). The HDLC will always disable the receiver once the receive overflow has been detected. The receiver will be re-enabled upon detection of the next flag, but will overflow again unless t he RX FIFO is read. This bit is reset after a read.This bit is cleared after a read of Y23 or Y33. Table 95 - HDLC Status Latch(Y23) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 FEOL Framing Bit Error Counter Overflow Latch. This bit is set when the framing bit counter(Y17) overflows. This bit is cleared after a read of Y24 or Y34. 14 CRCOL CRC-6 Error Counter Overflow Latch. T his bit is set if the CRC6 error counter(Y19) overflows. This bit is cleared after a read of Y24 or Y34. 13 OOFOL Out Of Frame Counter Overflow Latch. This bit is set when the OOF counter(Y1A) overflows. This bit is cleared after a read of Y24 or Y34. 12 COFAOL Change of Frame Alignment Counter Overflow Latch. This bit is set when the change of frame alignment counter (Y1A) overflows. This bit is cleared after a read of Y24 or Y34. 11 BPVOL Bipolar Violation Counter Overflow Latch. This bit is set when the bipolar violation counter(Y18) overflows.This bit is cleared after a read of Y24 or Y34. 10 PRBSOL Pseudo Random Bit Sequence Error Counter Overflow Latch. This bit is set when the PRBS error counter(Y15) overflows. This bit is cleared after a read of Y24 or Y34. 9 PRBSMFOL PRBS Multiframe Counter Overflow Latch. This bit is set when the PRBS multiframe counter(Y15) overflows. This bit is cleared after a read of Y24 or Y34. 8 MFOOFOL Multiframe Out of Frame Counter Overflow Latch. This bit is set if the Multiframe Out of Frame Counter(Y16) overflows. This bit is cleared after a read of Y24 or Y34. 7 TFSYNL Terminal Out Of Sync Latch. This bit is set when the terminal frame out of sync condition is acquired or lost. It is the latched version of the TFSYNC bit(Y10). This bit is cleared after a read of Y24 or Y34. 6 MFSYNL Multiframes Out Of Sync Latch. This bit is set when the multiframes out of sync condition is acquired or lost. It is the latched version of the MFSYNC bit (Y10).This bit is cleared after a read of Y24 or Y34. 5 FBEL Framing Bit Error Latch. This bit is set when a framing bit error is detected. It is cleared upon a read. It is the latched version of the Framing Bit Counter (Y17) event. This bit is cleared after a read of Y24 or Y34. 4C O F A L Change of Frame Alignment Latch. This bit is set when the change of frame alignment occurs. This is the latched version of the count event to change of frame counter (Y1A). This bit is cleared after a read of Y24 or Y34. 3 SEFL Severely Errored Frame Latch. This bit is set upon receipt of a line loopback disable code. This is a latched version of Y10. This bit is cleared after a read of Y24 or Y34. 2A I S L AIS Latch. This bit is set upon receipt of an AIS. This is a latched version of AIS(Y10).This bit is cleared after a read of Y24 or Y34. 1 CRCL CRC Error Latched. This bit is set when the receive CRC error occurs. This bit is cleared after a read of Y24 or Y34. 0L O S L Digital Loss of Signal. This bit goes high after the detection of 192 or 32 consecutive zeros. This is the latched version of LOS(Y10). This bit is cleared after a read of Y24 or Y34. Table 96 - Receive Sync and Alarm Latch(Y24) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 D4YALML D4 Yellow Alarm Latch. This bit is set if a D4 yellow alarm is detected within a 600 millisecond integration period. This bit is cleared after a read of Y25 or Y35. 14 D4Y48L D4 Yellow Alarm (48 milliseconds) Latch. This bit is set if a D4 yellow alarm is detected within a 48 millisecond integration period. This bit is cleared after a read of Y25 or Y35. 13 SECYELL Secondary D4 Yellow Alarm Latch. This bit is set if Secondary yellow alarm D4 (S bit in 12 th frame) is detected. It is cleared after a read.This bit is cleared after a read of Y25 or Y35. 12 ESFYELL ESF Yellow Alarm Latch. This bit is set upon receipt of a ESF yellow alarm. This bit is cleared after a read of Y25 or Y35. 11 T1DMYL T1DM Yellow Alarm Latched. If this bit is 1 a T1DM yellow alarm is received on bit 2 of 24th timeslot. This bit is cleared after a read of Y25 or Y35. 10 # not used. 9 BPVL Bipolar Violation Latch. This bit is set when a bipolar violation occurs. This bit is cleared after a read of Y25 or Y35. 8 PRBSL PRBS Latch. This bit is set when a PRBS error has occured.This bit is cleared after a read of Y25 or Y35. 7P D V L Pulse Density Violation Latch. This bit is set when the receive PDV is detected.This bit is cleared after a read of Y25 or Y35. 6 LLEDL Line Loopback Enable Detect Latch. This bit is set upon receipt of a line loopback enable code. It is cleared after a read. This is a latched version of LLED(Y10).This bit is cleared after a read of Y25 or Y35. 5 LLDDL Line Loopback Disable Detect Latch. This bit is set upon receipt of a line loopback disable code. It is cleared after a read. This is a latched version of LLDD(Y10).This bit is cleared after a read of Y25 or Y35. 4 BOML Bit Oriented Message Latch. This bit is set if a bit oriented message has been received. It is cleared upon a read.This bit is cleared after a read of Y25 or Y35. 3 BOMML Bit Oriented Message Match Latch. This bit is set if the bit oriented message received matches the value of the Bit Oriented Match register.This bit is cleared after a read of Y25 or Y35. 2C A S R L Channel Associated signaling Received Latch. This bit is set if the received CAS has changed on any of the 24 channels.This bit is cleared after a read of Y25 or Y35. 1 1SECL 1 Second Latch. This bit is set if the one second timer expires. This bit is cleared after a read of Y25 or Y35. 0 2SECL 2 Second Latch. This bit is set if the two second timer expires. This bit is cleared after a read of Y25 or Y35. Table 97 - Receive Line Status and Timer Latch(Y25) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-4 # not used. 3E X Z O L Excessive Zero Overflow Latch. This bit goes high whenever the excessive zero counter (Y1B) is overflows. This bit is cleared after a read of Y26 or Y36. 2 EXZL Excessive Zero Latch. This bit goes high whenever the excessive zero counter (Y1B) is incremeted by one. This bit is cleared after a read of Y26 or Y36. 1 TXSLIPL Transmit SLIP Latch. This bit goes high whenever a transmit slip occurs. This bit is cleared after a read of Y26 or Y36. 0 RXSLIPL Receive SLIP Latch. This bit goes high whenever a controlled frame slip occurs in the receive elastic buffer. This bit is cleared after a read of Y26 or Y36. Table 98 - Elastic Store and Excessive Zero Status Latch(Y26) (T1) Bit Name Functional Description 15-0 FCL<15:0> Framing Bit Error Count Latch. These bits make up a latch which samples the current value of the Framing Bit Error Counter (address Y17) on the rising edge of the internal one second timer. This latch is cleared with a RESET (RESET pin or RST bit). Table 99 - Framing Bit Error Count Latch(Y28) (T1) Bit Name Functional Description 15-0 BPVL<15:0> Bipolar Violation Count Latch. These bits make up a latch which samples the current value of the Bipolar Violation Error Counter (address Y18) on the rising edge of the internal one second timer. This latch is cleared with a RESET (RESET pin or RST bit). Table 100 - Bipolar Violation Count Latch(Y29) (T1) Bit Name Functional Description 15-0 CRCL<15:0> CRC-6 Error Count Latch. These bits make up a latch which samples the current value of the CRC Error Counter (address Y19) on the rising edge of the internal one second timer. This latch is cleared with a RESET (RESET pin or RST bit) Table 101 - CRC-6 Error Count Latch(Y2A) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-8 OOFL<7:0> Out of Frame Alignment Count Latch. These bits make up a latch which samples the current value of the Change of Frame Alignment Counter (address Y1A) on the rising edge of the internal one second timer. This latch is cleared with a RESET (RESET pin or RST bit). 7-0 COFAL<7:0> Change of Frame Alignment Count Latch. These bits make up a latch which samples the current value of the Change of Frame Alignment Counter (address Y1A) on the rising edge of the internal one second timer. This latch is cleared with a RESET (RESET pin or RST bit). Table 102 - Out of Frame Count and Change of Frame Count Latch(Y2B) (T1) Bit Name Functional Description 15-0 MFOOFL<15:0> Multiframe OOF Count Latch. These bits make up a latch which samples the current value of the MFOOF Error Counter (address Y16) on the rising edge of the internal one second timer. This latch is cleared with a RESET (RESET pin or RST bit). Table 103 - Multiframe Out of Frame Count Latch(Y2C) (T1)

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17.1.6 Interrupt Status Re gisters (Y30 - Y3 F) Bit Functions

Interrupt status register bit functions are shown in Tables 105 to 108.

17.1.7 Interrupt Mask Registers (Y40 - Y4F) Bit Functions

Tables 109 to 115 describe the bit functions of each of the Interrupt Mask Registers in the MT9072. Each register is repeated for each of the 4 framers (not the Interrupt Vector Mask). Framer 0 is addre ssed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2. and Framer 7 with Y=7 (where Y represents the 4 most significant address bits (MSB) A11 A10 A9 A8). In addition, a simultaneous write to all 8 Framers is possible by se tting the A11 address to Y=8 (1000). A (0) or (1) in the “Name” column of these tables indicates the state of the data bits after a hard reset (the RESET pin is toggled from zero to one), or a software reset (the RST bit in control register address YF1 is toggled from one to zero) or a T1E0 write to the Global Control Register bit 15. Bit Name Functional Description 15-9 # not used. 8G A I Go Ahead Interrupt. Indicates a go-ahead pattern (01111111) was detected by the HDLC receiver. This bit is reset after a read of Y33 or Y23. 7E O P D I End of Packet Data Interrupt.This bit is set when an end of packet (EOP) byte was written into the RX FIFO by the HDLC receiver. This can be in the form of a flag, an abort sequence or as an invalid packet. This bit is reset after a read of Y33 or Y23. 6 TEOPI Transmit End of Packet Interrupt.This bit is set when the transmitter has finished sending the closing flag of a packet or after a packet has been aborted. This bit is reset after a read of Y33 or Y23. 5E O P R I End of Packet Receive Fifo Interrupt.This bit is set when the byte about to be read from the RX FIFO is the last byte of the packet. It is also set if the Rx FIFO is read and there is no data in it.This bit is reset after a read of Y33 or Y23. 4T X F L I Transmit FIFO Low Interrupt.This bit is set when the Tx FIFO is emptied below the 16 byte low threshold level.This bit is reset after a read of Y33 or Y23. 3F A I Frame Abort: Transmit Interrupt. This bit (FA) is set when a frame abort is received during packet reception. It must be received after a minimum number of bits have been received (26) otherwise it is ignored. This bit is reset after a read of Y33 or Y23. 2 TXUNDERI Transmit Elastic Buffer Empty Interrupt. If high it Indicates that a read by the transmitter was attempted on an empty Tx FIFO. This bit is reset after a read of Y33 or Y23. 1 RXFFI Receive FIFO is filled above Threshold Interrupt. This bit is set when the Rx FIFO is filled above the 16 byte full threshold level. This bit is reset after a read of Y33 or Y23. 0R X O V F L I Receive Fifo Overflow Interrupt This bit Indicates that the 32 byte RX FIFO overflowed (i/.e. an attempt to write to a 32 byte full RX FIFO). The HDLC will always disable the receiver once the receive overflow has been detected. The receiver will be re-enabled upon detection of the next flag, but will overflow again unless the RX FIFO is read. This bit is reset after a read of Y33 or Y23. Table 104 - HDLC Interrupt Status Register(Y33) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-9 # not used. 8G A I M (0) Go Ahead Interrupt Mask. When unmasked an interrupt is generated when go-ahead pattern (01111111) was detected by the HDLC receiver. 7E O P D I M (0) End of Packet Data Interrupt Mask. When unmasked an interrupt is initiated when an end of packet (EOP) byte was written into the RX FIFO by the HDLC receiver.

6 TEOPIM

(0) Transmit End of Packet Interrupt Mask. When unmasked an interrupt is initiated when the transmitter has finished sending the closing flag of a packet or after a packet has been aborted. 5E O P R I M (0) End of Packet Received Interrupt Mask. When unmasked an interrupt is initiated when the byte about to be read from the RX FIFO is the last byte of the packet. An interrupt is also initiated if the Rx FIFO is read and there is no data in it. 4T X F L I M (0) Transmit Fifo Low Interrupt Mask. When unmasked an interrupt is initiated when the Tx FIFO is emptied below the selected low threshold level. 3F A I M (0) Frame Abort: Transmit Interrupt Mask. When unmasked an interrupt is initiated this bit (FA) is set when a frame abort is received during packet reception. It must be received after a minimum number of bits have been received (26) otherwise it is ignored.

2 TXUNDERIM

(0) Transmit Fifo Underrun Interrupt Mask. When unmasked an interrupt is initiated for TX FIFO underrun indication. 1R X F F I M (0) Receive Fifo full Threshold interrupt Mask. When unmasked an interrupt is initiated whenever the Rx FIFO is filled above the 16 byte threshold level. 0R X O V F L I M (0) Receive Fifo Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the 32 byte RX FIFO overflowed (i.e., an attempt to write to a 32 byte full RX FIFO). Table 105 - HDLC Interrupt Mask Register(Y43) (T1) Bit Name Functional Description

15 FEOIM

(0) Framing Bit Error Counter Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the framing bit error counter changes from FFH to 00H. 1 -masked, 0 - unmasked.

14 CRCOIM

(0) CRC-6 Error Counter Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the CRC-6 error counter changes from FFH to 00H. 1 - masked, 0 - unmasked.

13 OOFOIM

(0) Out Of Frame Counter Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the out of frame counter changes state from changes from FFH to 00H. 1 - masked, 0 - unmasked.

12 COFAOIM

(0) Change of Frame Alignment Counter Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the change of frame alignment counter changes from FFH to 00H. 1 - masked, 0 - unmasked. Table 106 - Receive and Sync Interrupt Mask Register(Y44) (T1)

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11 BPVOIM

(0) Bipolar Violation Counter Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the bipolar violation counter changes from FFH to 00H. 1- masked, 0 - unmasked.

10 PRBSOIM

(0) Pseudo Random Bit Sequence Error Counter Overflow Interrupt Mask. When unmasked an interrupt will be generated whenever the PRBS error counter changes from FFH to 00H. 1 - masked, 0 -unmasked.

9 PRBSMFOIM

(0) Pseudo Random Bit Sequence Multiframe Counter Overflow Interrupt Mask. When unmasked an interrupt will be generated whenever the multiframe counter attached to the PRBS error counter overflows. FFH to 00H. 1 - masked, 0 - unmasked.

8 MFOOFOIM

(0) Multiframes Out Of Sync Overflow Interrupt Mask. When unmasked an interrupt will be generated when the multiframes out of frame counter changes from FFH to 00H. 1 -masked, 0 - unmasked.

7 TFSYNIM

(0) Terminal Frame Synchronization Interrupt Mask. When unmasked an interrupt is initiated when a loss of terminal frame synchronization condition exists. If 1 - masked, 0 - unmasked.

6 MFSYNIM

(0) Multiframe Synchronization Interrupt Mask. When unmasked an interrupt is initiated when a loss of multiframe synchronization condition exist. If 1 - masked, 0 - unmasked.

5 FBEIM

(0) Framing Bit Error Interrupt Mask. When unmasked an interrupt is initiated whenever an erroneous framing bit is detected (if circuit is in terminal frame sync). 1-masked, 0- unmasked.

4 BOMIM

(0) Bit Oriented Message Interrupt. When unmasked an interrupt is initiated whenever a pattern 111111110xxxxxx0 has been received on the FDL that is different from the last message. The new message must persist for 8 out the last 10 message positions to be accepted as a valid new message. 1 -masked, 0 - unmasked.

3 BOMMI

(0) Bit Oriented Message Match Interrupt. When unmasked an interrupt is initiated whenever a pattern 111111110xxxxxx0 has been received on the FDL that is different from the last message and matches the contents of Bit Oriented Message Match Register. The new message must persist for 8 out the last 10 message positions to be accepted as a valid new message. 1 -masked, 0 - unmasked.

2 CASRI

(0) Receive Channel Associated Signaling(CAS) Change Interrupt. When unmasked an interrupt is initiated whenever a change of state (optionally debounced - see RSDB in signaling Control Word) is detected in the signaling bits (AB or ABCD) pattern. 1 1SECI (0) One Second Interrupt Status. When unmasked an interrupt is initiated whenever the 1 SEC status bit goes from low to high. This bit is reset after a read of Y35 or Y25. 0 2SECI (0) Two Second Interrupt Status. When unmasked an interrupt is initiated whenever the 2SEC status bit goes from low to high. This bit is reset after a read of Y35 or Y25. Bit Name Functional Description Table 106 - Receive and Sync Interrupt Mask Register(Y44) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description

15 D4YALMIM

(0) D4 Yellow Interrupt Mask. When unmasked this interrupt bit goes high whenever the D4 Yellow alarm code has been received. If 1 - masked, 0 - unmasked.

14 D4Y48IM

(0) D4 Y48 Interrupt Mask. When unmasked this interrupt bit goes high whenever the D4 Yellow alarm code has been received for 48 msec. If 1 - masked, 0 - unmasked.

13 SECYELIM

(0) Secondary Yellow Interrupt Mask. When unmasked this interrupt bit goes high whenever a Secondary Yellow alarm is received. If 1 - masked, 0 - unmasked.

12 ESFYELIM

(0) ESF Yellow Interrupt Mask. When unmasked this interrupt bit goes high whenever a ESF Yellow alarm is received. If 1 - masked, 0 - unmasked.

11 T1DMYIM

(0) T1DM Yellow Interrupt Mask. When unmasked this interrupt bit goes high whenever a TIDM Yellow alarm is received. If 1 - masked, 0 - unmasked. 10 # not used

9 BPVIM

(0) Bipolar Violation Interrupt Mask. When unmasked this interrupt bit goes high whenever a bipolar violation (excluding B8ZS encoding) is encountered. If 1 - masked, 0 - unmasked.

8 PRBSIM

(0) Pseudo Random Bit Sequence Error Interrupt Mask. When unmasked this interrupt bit goes high upon detection of an error with a channel selected for PRBS testing. If 1 - masked, 0 - unmasked. 7P D V I M (0) Pulse Density Violation Interrupt Mask. When unmasked this interrupt bit goes high whenever a sequence of 16 consecutive zeros is received on the line, or the incoming pulse density is less than N ones in a time frame of 8(N+1) where N = 1 to 23. If 1 - masked, 0 - unmasked. 6L L E D I M (0) Loop Code Enable Detected Interrupt Mask. When unmasked this interrupt bit goes high whenever the loop up code has been detected on the line for a period of 48 milliseconds. If 1 - masked, 0 - unmasked.

5 LLDDIM

(0) Loop Code Disable Detected Interrupt Mask. When unmasked this interrupt bit goes high whenever the loop down code has been detected on the line for a period of 48 milliseconds. If 1 - masked, 0 - unmasked. Table 107 - Receive Line and Timer Interrupt Mask Register(Y45) (T1)

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17.1.8 Per Channel Control and Data (Y50 - YAF) Bit Functions

Tables 112 to 114 provide the per timeslot control for si gnaling and Per Channel Control. The reset values of Per channel Transmit signaling and Receive signaling bits can be 1 or 0. Bit Name Functional Description 15-4 # not used.

3 EXZOI

(0) Excessive Zero Overflow Interrupt. This bit goes high whenever the excessive zero counter (Y1B) overflows.This bit is reset after a read of Y36 or Y26. 2E X Z I (0) EXcessive Zero Interrupt. This bit goes high whenever the excessive zero counter (Y1B) is incremeted by one. This bit is reset after a read of Y36 or Y26.

1 TXSLIPIM

(0) Transmit SLIP Interrupt Mask. When unmasked an interrupt is initiated whenever a controlled frame slip occurs in the transmit elastic buffer. If 1 - masked, 0 - unmasked.

0 RXSLIPIM

(0) Receive SLIP Interrupt Mask. When unmasked an interrupt is initiated whenever a controlled frame slip occurs in the receive elastic buffer. If 1 - masked, 0 - unmasked. Table 108 - Elastic Store and Excessive zero Interrupt Mask Register(Y46) (T1) Bit Name Functional Description 15-4 # not used. 3T A ( n ) Transmit Signaling Bits A for Channel n. Where signaling is enabled, these bits are transmitted in bit position 8 of the 6th DS1 frame (within the 12 frame superframe structure for D4 superframes and the 24 frame structure for ESF superframes). This data is obtained from the CSTi interface but can be overwritten via the Micro port for trunk conditioning applications. If the MPST bit in the corresponding per timeslot control is not set, this value will be constantly overwritten by the CSTi stream. 2T B ( n ) Transmit Signaling Bits B for Channel n. Where signaling is enabled, these bits are transmitted in bit position 8 of the 12th DS1 frame (within the 12 frame superframe structure for D4 superframes and the 24 frame structure for ESF superframes).This data is obtained from the CSTi interface but can be overwritten via the Micro port for trunk conditioning applications. If the MPST bit in the corresponding per timeslot control is not set, this value will be constantly overwritten by the CSTi stream. 1T C ( n ) Transmit Signaling Bits C for Channel n. Where signaling is enabled, these bits are transmitted in bit position 8 of the 18th DS1 frame within the 24 frame structure for ESF superframes. In D4 mode these bits are unused. This data is obtained from the CSTi interface but can be overwritten via the Micro port for trunk conditioning applications. If the MPST bit in the corresponding per timeslot control is not set, this value will be constantly overwritten by the CSTi stream. 0T D ( n ) Transmit Signaling Bits D for Channel n. Where signaling is enabled, these bits are transmitted in bit position 8 of the 24th DS1 frame within the 24 frame structure for ESF superframes. In D4 mode these bits are unused.This data is obtained from the CSTi interface but can be overwritten via the Micro port for trunk conditioning applications. If the MPST bit in the corresponding per timeslot control is not set, this value will be constantly overwritten by the CSTi stream. Table 109 - Per Channel Transmit Signaling Y50-Y67 (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 - 4 # not used. 3R A ( n ) Receive Signaling Bits A for Channel n. Where signaling is enabled, these bits are received in bit position 8 of the 6th DS1 frame (within the 12 frame superframe structure for D4 superframes and the 24 frame structure for ESF superframes).This data can be overwritten by the microport for trunk conditioning applications. 2R B ( n ) Receive Signaling Bits B for Channel n. Where signaling is enabled, these bits are received in bit position 8 of the 12th DS1 frame (within the 12 frame superframe structure for D4 superframes and the 24 frame structure for ESF superframes).This data can be overwritten by the microport for trunk conditioning applications. 1R C ( n ) Receive Signaling Bits C for Channel n. Where signaling is enabled, these bits are transmitted in bit position 8 of the 18th DS1 frame within the 24 frame structure for ESF superframes. In D4 mode these bits are unused.This data can be overwritten by the microport for trunk conditioning 0R D ( n ) Receive Signaling Bits D for Channel n. Where signaling is enabled, these bits are transmitted in bit position 8 of the 24th DS1 frame within the 24 frame structure for ESF superframes. In D4 mode these bits are unused.This data is obtained from the CSTi interface but can be overwritten via the Micro port for trunk conditioning applications.This data can be overwritten by the microport for trunck conditioning applications. Table 110 - Per Channel Receive Signaling Y70-Y87 (T1)

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17.1.9 Master Control Registers (YF1 to YF7) Bit Functions

Tables 116 to 122 describe the bit functions of each of the Master Control Registers in the MT9072 for T1 mode. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2,... Framer 7 with Y=7 (where Y represents the 4 most significant address bits (MSB) A 11 A10 A9 A8). In addition, a simultaneous write to all 8 Framers is possible by setting the address A11 to 1 and A10 to A8 to 0. A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a hard reset (the RESET pin is toggled from zero to one), or a software reset (the RS T bit in control register address YF1 is toggled from one to zero or toggling of RSTC in Global Control Register). The (#) indicates that a (0) or (1) is possible. Bit Name Functional Description 15-10 # not used. 9R P C I (0) Receive Per Channel Inversion. The data received from the incoming DS1 channel is inverted before it emerges from DSTo if this bit is set for the channel. 8M P D R (0) Micro Port Data Receive. Setting this bit allows for the receive data for a given channel to be replaced by data in the idle code(Y09). The idle code can be written by the micro port for trunk conditioning applications. 7 MPST Micro Port Signaling Transmit. Setting this bit allows for the transmit signaling for a given channel to be replaced by the bits in the Per Channel Transmit signaling Registration-TD of registers Y50-Y67. They can be written by the micro port for trunk conditioning applications. 6T P C I (0) Transmit Per Channel Inversion. When set high the data for this channel sourced from DSTi is inverted before being transmit onto the equivalent DS1 channel. 5R T S L (0) Remote Timeslot Loopback. If one, the corresponding DS1 receive timeslot is looped to the corresponding DS1 transmit timeslot. This received timeslot will also be present on DSTo. If zero, the receive loopback is disabled. 4L T S L (0) Local Timeslot Loopback. If one, the corresponding transmit timeslot is looped to the corresponding receive timeslot. This transmit timeslot will also be present on the transmit DS1 stream. If zero, this loopback is disabled. 3T T S T (0) Transmit Test. If one the Mu-law digital milliwatt (where control bit ADSEQ is one) or a PRBS generator (215-1) (ADSEQ is zero) will be transmitt ed in the corresponding DS1 timeslot. More than one timeslot may be activated at once. If zero, the test signal will not be connected to the corresponding timeslot. 2R R S T (0) Receive Test. If one, the Mu-law digital milliwatt (w here control bit ADSEQ is one) will be sent to the DSTo or a PRBS data (215-1) (if ADSEQ is zero) will be expected in the corresponding PCM 24 timeslot. If zero, the PRBS detector will not be connected to the corresponding timeslot. 1M P D T (0) Micro Port Data Transmit. Setting this bit allows for the transmit data for a given channel to be replaced by the idle code(Y0A). The idle code can be written by the micro port for trunk conditioning applications. Ensure that TTST and RTSL are off. 0C C (0) Clear Channel. When set high no robbed bit signaling is inserted in the equivalent transmit DS1 channel. When set low robbed bit signaling is included in every 6th frame. Table 111 - Per Channel Control Word(Y90-YA7) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-11 # not used.

10 Tx8KEN

(0) Transmit 8 KHz Enable. If one, the pin RxMF transmits a positive 8 KHz frame pulse synchronous with the serial data stream TPOS/TNEG. If zero, the pin RxMF transmits a negative frame pulse synchronous with the multiframe boundary of data coming out of DSTo. 9R x D O (0) Receive DSTo All Ones. If one, the DSTo pin operates normally. If zero, all timeslots (0-31) of DSTo are set to one.

8 TXMFSEL

(0) Transmit Multiframe Select. This bit is used to select if the framer is used for application of the TXMF pulse which sets the multiframe boundary for the T1 transmitters. A one will select the framer for application of TXMF.

7 SPND

(0) Suspend Interrupts. If zero, the IRQ output will be in a high-impedance state and all interrupts will be ignored. If one, the IRQ output will function normally. 6I N T A (0) Interrupt Acknowledge. All interrupt and latched status registers for a particular framer may be cleared (without reading the interrupt status registers) by setting the INTA control bit to zero. Interrupt status registers for a particular framer will be cleared (and not updated) as long as INTA is low. The framers interrupt vector bits will remain at zero, therefore that framer cannot toggle the IRQ pin. 5D S T o E N (0) DSTo Enable. If zero, pin DSTo is tristate. If set, pin DSTo is enabled. 4C S T o E N (0) CSTo Enable. If zero, pin CSTo is tristate. If set, pin CSTo is enabled. 3R x C O (0) Receive CSTo All Ones.If one, the CSTo pin operates normally. If zero all timeslots of CSTo are set to one

2 CNTCLR

(0) Counter Clear. When this bit is changed from zero to one, all non-latched status counters (address Y15 to Y1A) are cleared. If zero, all non-latched status counters operate normally.

1 SAMPLE

(0) One Second Sample. Setting this bit causes the latched error counters(Y28 to Y2C) (change of frame alignment, loss of frame alignment, bpv errors, crc errors, severely errored frame events and multiframes out of sync) to be updated on one second intervals coincident with the one second timer (Y11). 0R S T (0) Reset. When this bit is changed from zero to one, the selected framer (Y) will reset to its default mode. The default mode will depend on the T1E0 bit(Global control0 bit 15). Any write to his bit should be followed by 125 usec before initialization of per timeslot control etc. See the Reset Operation section for the default settings. Table 112 - Interrupt and I/O Control(YF1) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-11 # not used.

10 ADREC

(0) Address Recognition.When high, this bit will enable address recognition. This forces the receiver to recognize only those packets having the unique address as programmed in the Receive Address Recognition Registers or if the address is an All Call Address. 9R X E N (0) Receive Enable.When low this bit will disable the HDLC receiver. The receiver will disable after the rest of the packet presently being received is finished. The receiver’s internal clock is disabled. When high the receiver will be immediately enabled (depending on the state of RXCEN input) and will begin searching for flags, Go-aheads etc. 8T X E N (0) Transmit Enable.When low this bit will disable the HDLC transmitter. The transmitter will disable after the completion of the packet presently being transmitted. The transmitter’s internal clock is disabled. When high the transmitter will be immediately enabled (depending on the state of the TXCEN input) and will begin transmitting data, or go to a mark idle or interframe time fill state. 7E O P (0) End of Packet When set this bit will indicate an end of packet byte to the transmitter, which will transmit an FCS following this byte. This facilitates loading of multiple packets into TX FIFO. Reset automatically after a write to the TX FIFO occurs. 6F A (0) Framer Abort.Forms a tag on the next byte written to the TX FIFO, and when set will indicate to the transmitter that it should abort the packet in which that byte is being transmitted. Reset automatically after a write to the TX FIFO. 5M I (0) Mark-Idle.When low, the transmitter will be in an idle state. When high it is in an interframe time fill state. These two states will only occur when the TX FIFO is empty. 4C Y C L E (0) Cycle.When high, this bit will cause the transmit byte count to cycle through the value loaded into the Transmit Byte Count Register.

3 TCRCI

(0) Transmit CRC Inhibit. When high, this bit will inhibit transmission of the CRC. That is, the transmitter will not insert the computed CRC onto the bit stream after seeing the EOP tag byte. This is used in V.120 terminal adaptation for synchronous protocol sensitive UI frames.

2 SEVEN

(0) Seven.When high, this bit will enable seven bits of address recognition in the first address byte. The received address byte must have bit 0 equal to 1 which indicates a single address byte is being received. 1R X F R S T (0) Rx Fifo Reset.When high, the RX FIFO will be reset. This causes the receiver to be disabled until the next reception of a flag. The status register will identify the FIFO as being empty. However, the actual bit values in the RX FIFO will not be reset. 0T X F R S T (0) Transmit FIFO Reset When high, the TX FIFO will be reset. The Status Register will identify the FIFO as being empty. This bit will be reset when data is written to the TX FIFO. However, the actual bit values of data in the TX FIFO will not be reset. Table 113 - HDLC Control 1(YF2) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-6 # not used.

5 HRST

(0) HDLC Reset. When this bit is high, the HDLC and HDLC registers will be reset (HDLC Control, HDLC Test Control, Address Recognition Byte). This is similar to RESET being applied, the only difference being that this bit will not be reset. This bit can only be reset by writing a zero to this location or applying RESET.

4 RTLOOP

(0) Receive Transmit Loopback. When this bit is high, receive to transmit HDLC loopback will be activated. Receive data, including end of packet indication, but not including flags or CRC, will be written to the TX FIFO as well as the RX FIFO. When the transmitter is enabled, this data will be transmitted as though written by the microprocessor. Both good and bad packets will be looped back. Receive to transmit loopback may also be accomplished by reading the RX FIFO using the microprocessor and writing these bytes, with appropriate tags, into the TX FIFO.

3 CRCTST

(0) CRC Test. This bit allows direct access to the CRC Comparison Register in the receiver through the serial interface. After testing is enabled, serial data is clocked in until the data aligns with the internal comparison (16 RXC clock cycles) and then the clock is stopped. The expected pattern is F0B8 hex. Each bit of the CRC can be corrupted to allow more efficient testing. 2F T S T (0) Fifo Test. This bit allows the writing to the RX FIFO and reading of the TX FIFO through the microprocessor to allow more efficient testing of the FIFO status/interrupt functionality. This is done by making a TX FIFO write become a RX FIFO write and a RX FIFO read become a TX FIFO read. In addition, EOP/FA and RQ8/RQ9 are re-defined to be accessible (i.e. RX write causes EOP/FA to go to RX fifo input; TX read looks at output of TX fifo through RQ8/RQ9 bits). 1A D T S T (0) Address Recognition Test. This bit allows direct access to the Address Recognition Registers in the receiver through the serial interface to allow more efficient testing. After address testing is enabled, serial data is clocked in until the data aligns with the internal address comparison (16 RXc clock cycles) and then clock is stopped. Then the VADDR bit in Y1C can be checked.

0 HLOOP

(0) HDLC Loopback. When high, transmit to receive HDLC loopback will be activated. The packetized transmit data will be looped back to the receive input. RXEN and TXEN bits must also be enabled. Table 114 - HDLC Test Control(YF3) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-9 ADM26 ADM20 (0000000) Address Mask 26 to Address Mask 20. A seven bit mask used to interrogate the second byte of the received address. Adr26 is the MSB. This mask is ignored (as well as first byte mask) if all call address (1111111) is received. 8A 2 E N (0) Address 2 Enable. When this bit is high, this seven bit mask is used in address comparison of the second address byte. If address recognition is enabled, any packet failing the address comparison will not be stored in the RX FIFO. A2en must be high for All-call address recognition. When this bit is low, this bit mask is ignored in address comparison 7 - 2 ADRM16 ADRM11 (000000) Address Mask 16 to Address Mask 11.A six bit mask used to interrogate the first byte of the received address. AdrM16 is MSB.

1 ADRM10

(0) Address 10 Mask.This bit is used in address comparison if a seven bit address is being checked for (YF2 bit ’Seven’ is set). 0A 1 E N (0) Address 1 Enable.When this bit is high, this six (or seven) bit mask is used in address comparison of the first address byte. If address recognition is enabled, any packet failing the address comparison will not be stored in the RX FIFO. A1en must be high for All-call (1111111) address recognition for single byte address. When this bit is low, this bit mask is ignored in address comparison. Table 115 - Address Recognition Register(YF4) (T1) Bit Name Functional Description 15-8 # not used. 7 - 0 BIT7-0 (00000000) This eight bit word is tagged with the two status bits from control register 1 (EOP and FA), and the resulting 10 bit word is written to the TX FIFO. The FIFO status is not changed immediately after a write or read occurs. It is updated after the data has settled and the transfer to the last available position has finished. Note that when the HDLC is connected to a T1 channel, the least significant bit in the FIFO is sent first. Table 116 - TX Fifo Write Register(YF5) (T1) Bit Name Functional Description 15-8 # not used. 7-0 CNT7-0 (00000000) The Transmit Byte Count Register indicating the length of the data portion of the packet about to be transmitted. This is the size of the data and not the address, flags or FCS. The Transmit Byte Counter position Y1C determines the number of bytes that have been sent from the Transmit FIFO. Table 117 - TX Byte Count Register(YF6) (T1)

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17.1.10 Global Control and Status Registers (900 - 91F) Bit Functions

The Global Control and Status Registers are common to th e T1 and E1 operation. The global registers are accessed by address hex 9xx ( A11 and A8 being high and A10 and A9 being low) Bit Name Functional Description 15-8 # not used. 7-0 TxSD7-0 (00000000) Transmit Set Delay Bits 7 - 0. Writing to this register forces a one time setting of the delay through the transmit slip buffer. The binary value written to the Transmit Set Delay Bits defines the delay between the write of the Transmit ST-BUS Channel containing DS1 timeslot 1 (first timeslot) and its read from the slip buffer. If the value written to the Transmit Set Delay Bits is 00H to BFH then the delay can be calculated as: (Value) / (1.544 x 106) seconds. If the value written to the Transmit Set Delay Bits is C0H to FFH then the delay can be calculated as: (255 - value) / (2.048 x 106) seconds. After a reset there will be an immediate transmit slip and the subsequent delay through the transmit slip buffer will be one frame. Table 118 - TX Set Delay Bits (YF7) (T1) Bit Name Functional Description

15 T1E0

(1) T1E0. This bit determines if the chip will operate in T1 or E1 mode for all 8 framers. If the value of this bit is changed the chip is reset in E1 or T1 default register mode. If the bit is set to 1, all the framer register values are set to T1 defaults. For a setting of 0 the register values are set to E1 defaults. This action takes approximately 34 1.5444 clock cycles. Hence any writes to registers should be done on the next 125 usec frame after setting or clearing this bit.

14 STBUS

(0) ST-BUS Enable. If zero, ST-BUS timing is enabled. If one, GCI timing is enabled (only available for 2.048 Mb/s mode). See Figures 24-31. 13-5 # not used. 4C K 1 (0) Clock Rate. This clock select bit determines the system clock at the CKi pin and the receive frame pulse at the FPi pin as follows (See Figures 24 to 31): CK1 Clock Frame Pulse System Bus 0 4.096 MHz 2.048 Mb/s 2.048 Mb/s 1 16.384 MHz 8.192 Mb/s 8.192 Mb/s 3-1 # not used. 0R S T C (0) Common Reset. When this bit is changed from zero to one, all eight framers will reset to their default T1 mode. This software reset has the same effect as the RESET pin. See the Reset Operation section for the default settings. Table 119 - Global Control0 Register (R/W Address 900) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-11 CHANNUM (00000) Channel Number.These 5 bits determine the channel that is used for updating of the ST-Bus Analyzer buffer. 10-8 # not used. 7-6 STRNUM (00000) Stream Number. These 5 bits determine the streams that will be used as the source data for the ST-Bus Analyzer buffer. 00: DSTi 01: DSTo 10: CSTi 11: CSTo 5S T B U F E N (0) ST-BUS Analyser Buffer Enable. Setting this bit enables the ST-BUS Analyser Buffer update. When the user reads the buffer (920-93F), this bit must be 0. Any reads of the buffer while this bit is set does not ensure correct data being read. 4-2 FNUM (2:0) (000) Framer Number 0 to 7

1 CHUP

(0) Channel Update. If 0 the update of the memory is at frame rate for a given channel. The channel selected for update is provided by the ChanNum bits of this register. If set the complete frame (channels 0 to 32) are updated to the buffer. 0C O N T S I N (0) Continuous Single. If set to 1 the ST-BUS Analyzer buffer is updated continuously. If set to zero the buffer is updated once and stopped. An optional interrupt can be generated once the buffer is full 1. The ST-BUS Analyser can be used in continuous acquisition mode without any problem (Register 901, bit 0 is set). If the ST-BUS analyser is used in the single mode (Register 901, bit 0 is cleared) an interrupt generated cannot be cleared and the MT9072 has to be reset. Table 120 - Global Control1 Register (R/W Address 901) (T1) Bit Name Functional Description

15 F3HM

(0) Framer 3 HDLC Mask. This is the mask bit for the F3HVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

14 F3EM

(0) Framer 3 Elastic Mask. This is the mask bit for the F3EVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

13 F3RM

(0) Framer 3 Rx Line Mask. This is the mask bit for the F3RVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Table 121 - Interrupt Vector 1 Mask Register (Address 902) (T1)

Zarlink Semiconductor Inc.

12 F3SM

(0) Framer 3 Sync and Overflow Mask. This is the mask bit for the F3SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

11 F2HM

(0) Framer 2 HDLC Mask. This is the mask bit for the F2HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

10 F2EM

(0) Framer 2 Elastic Mask. This is the mask bit for the F2EVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 9F 2 R M (0) Framer 2 Rx Line Mask. This is the mask bit for the F2RVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 8F 2 S M (0) Framer 2 Sync and Overflow Mask. This is the mask bit for the F2SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 7F 1 H M (0) Framer 1 HDLC Mask. This is the mask bit for the F1HVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 6F 1 E M (0) Framer 1 Elastic Mask. This is the mask bit for the F1EVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 5F 1 R M (0) Framer 1 Rx Line Mask. This is the mask bit for the F1RVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 4F 1 S M (0) Framer 1 Sync and Overflow Mask. This is the mask bit for the F1SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 3F 0 H M (0) Framer 0 HDLC Mask. This is the mask bit for the F0HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Bit Name Functional Description Table 121 - Interrupt Vector 1 Mask Register (Address 902) (T1)

15 F7HM

(0) Framer 7 HDLC Mask. This is the mask bit for the F7HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

14 F7EM

(0) Framer 7 Elastic Mask. This is the mask bit for the F7EVS status bit in the Interrupt Vector Register(address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

13 F7RM

(0) Framer 7 Rx Line Mask. This is the mask bit for the F7RVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

12 F7SM

(0) Framer 7 Sync and Overflow Mask. This is the mask bit for the F7SVS status bit in the Interrupt Vector Register(address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

11 F6HM

(0) Framer 6 HDLC Mask. This is the mask bit for the F6HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally.

10 F6EM

(0) Framer 6 Elastic Mask. This is the mask bit for the F6EVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 9F 6 R M (0) Framer 6 Rx LineMask. This is the mask bit for the F6RVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Table 122 - Interrupt Vector 2 Mask Register (Address 903) (T1) Bit Name Functional Description Table 121 - Interrupt Vector 1 Mask Register (Address 902) (T1)

Zarlink Semiconductor Inc. 8F 6 S M (0) Framer 6 Sync and Overflow Mask. This is the mask bit for the F6SVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 7F 5 H M (0) Framer 5 HDLC Mask. This is the mask bit for the F5HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 6F 5 E M (0) Framer 5 Elastic Mask. This is the mask bit for the F5EVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 5F 5 R M (0) Framer 5 Rx Line Mask. This is the mask bit for the F5RVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 4F 5 S M (0) Framer 5 Sync and Overflow Mask. This is the mask bit for the F5SVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 3F 4 H M (0) Framer 4 HDLC Mask. This is the mask bit for the F5HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 2F 4 E M (0) Framer 4 Elastic Mask. This is the mask bit for the F4EVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 1F 4 R M (0) Framer 4 Rx Line Mask. This is the mask bit for the F4RVS status bit in the Interrupt Vector register(address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 0F 4 S M (0) Framer 4 Sync and Overflow Mask. This is the mask bit for the F4SVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Bit Name Functional Description Table 122 - Interrupt Vector 2 Mask Register (Address 903) (T1)

Zarlink Semiconductor Inc. Bit Name Functional Description

15 SLBK8

(0) ST-BUS Loopback 8M All. If one, DSTo[0] is connected to DSTi[4], and DSTo[4] is connected to

14 SLBK67

(0) ST-BUS Loopback Framer 6 & 7. If one, DSTo[6] is connected to DSTi[7], and DSTo[7] is connected to DSTi[6]. Used only in 2.048 Mb/s mode. See Loopback section for details.

13 SLBK45

(0) ST-BUS Loopback Framer 4 & 5. If one, DSTo[4] is connected to DSTi[5], and DSTo[5] is connected to DSTi[4]. Used only in 2.048 Mb/s mode. See Loopbacks section.

12 SLBK23

(0) ST-BUS Loopback Framer 2 & 3. If one, DSTo[2] is connected to DSTi[3], and DSTo[3] is connected to DSTi[2]. Used only in 2.048 Mb/s mode. See Loopbacks section.

11 SLBK01

(0) ST-BUS Loopback Framer 0 & 1. If one, DSTo[0] is connected to DSTi[1], and DSTo[1] is connected to DSTi[0]. Used only in 2.048 Mb/s mode. See Loopbacks section.

10 RLBK8

(0) Remote Loopback 8 Framers. If one, TPOS[0]/TNEG[0] are connected to RPOS[4]/RNEG[4], and TPOS[4]/TNEG[4] are connected to RPOS[0]/RNEG[0]. This is used especially for 8.192 Mbit/s mode but may also be used in 2.048 Mbit/s mode. See Loopbacks section.

9 RLBK67

(0) Remote Loopback Framer 6 & 7. If one, TPOS[6]/TNEG[6] are connected to RPOS[7]/RNEG[7], and TPOS[7]/TNEG[7] are connected to RPOS[6]/RNEG[6]. Used only in 2.048 Mb/s mode. See Loopbacks section.

8 RLBK45

(0) Remote Loopback Framer 4 & 5. If one, TPOS[4]/TNEG[4] are connected to RPOS[5]/RNEG[5], and TPOS[5]/TNEG[5] are connected to RPOS[4]/RNEG[4]. Used only in 2.048 Mb/s mode. See Loopbacks section.

7 RLBK23

(0) Remote Loopback Framer 2 & 3. If one, TPOS[2]/TNEG[2] are connected to RPOS[3]/RNEG[3], and TPOS[3]/TNEG[3] are connected to RPOS[2]/RNEG[2]. Used only in 2.048 Mb/s mode. See Loopbacks section.

6 RLBK01

(0) Remote Loopback Framer 0 & 1. If one, TPOS[0]/TNEG[0] are connected to RPOS[1]/RNEG[1], and TPOS[1]/TNEG[1] are connected to RPOS[0]/RNEG[0]. Used only in 2.048 Mb/s mode. See Loopbacks section. 5-0 # not used Table 123 - Framer Loopback Global Register(904) (T1) Bit Name Functional Description

15 F3HVS

(0) Framer 3 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(333) for framer are set. This bit can be masked and will remain low by the F3HM bit in address 902.

14 F3EVS

(0) Framer 3 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(336) or Elastic store status for Framer 3 are set. This bit can be masked and will remain low by the F3EM bit in address 902.

13 F3RVS

(0) Framer 3 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(335) for Framer 0 are set. This bit can be masked and will remain low by the F3RM bit in address 902. Table 124 - Interrupt Vector 1 Status Register (Address 910) (T1)

Zarlink Semiconductor Inc.

12 F3SVS

(0) Framer 3 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(334) for Framer 3 are set. This bit can be masked and will remain low by the F3SM bit in address 902.

11 F2HVS

(0) Framer 2 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(233) or Elastic store status far Framer 2 are set. This bit can be masked and will remain low by the F2HM bit in address 902.

10 F2EVS

(0) Framer 2 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elastic status register(236) or Elastic store status for Framer 2 are set. This bit can be masked and will remain low by the F2EM bit in address 902. 9F 2 R V S (0) Framer 2 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(235) for Framer 2 are set. This bit can be masked and will remain low by the F2RM bit in address 902.

8 F2SVS

(0) Framer 2 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Counter status register(234) for Framer 2 are set. This bit can be masked and will remain low by the F2SM bit in address 902. 7F 1 H V S (0) Framer 1 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(133) or Elastic store status for Framer 1 are set. This bit can be masked and will remain low by the F2HM bit in address 902.

6 F1EVS

(0) Framer 1 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(136) or Elastic store status for Framer 1 are set. This bit can be masked and will remain low by the F1EM bit in address 902. 5F 1 R V S (0) Framer 1 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(135) for Framer 1 are set. This bit can be masked and will remain low by theF1RM bit in address 902.

4 F1SVS

(0) Framer 1 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(134) for Framer 3 are set. This bit can be masked and will remain low by the F1SM bit in address 902. 3F 0 H V S (0) Framer 0 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(033) or Elastic store status for Framer 0 are set. This bit can be masked and will remain low by the F0HM bit in address 902.

2 F0EVS

(0) Framer 0 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(036) or Elastic store status for Framer 0 are set. This bit can be masked and will remain low by the F0EM bit in address 902. 1F 0 R V S (0) Framer 0 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(035) for Framer 0 are set. This bit can be masked and will remain low by the F0RM bit in address 902.

0 F0SVS

(0) Framer 0 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(034) for Framer 0 are set. This bit can be masked and will remain low by the F0SM bit in address 902. Bit Name Functional Description Table 124 - Interrupt Vector 1 Status Register (Address 910) (T1) (continued)

Zarlink Semiconductor Inc. Bit Name Functional Description

15 F7HVS

(0) Framer 3 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(733) for Framer 7 are set. This bit can be masked and will remain low by the F7HM bit in address 903.

14 F7EVS

(0) Framer 7 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(736) or Elastic store status for Framer 7 are set. This bit can be masked and will remain low by the F7EM bit in address 903.

13 F7RVS

(0) Framer 7 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(735) for Framer 7 are set. This bit can be masked and will remain low by the F7RM bit in address 903 .

12 F7SVS

(0) Framer 7 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(734) for Framer 3 are set. This bit can be masked and will remain low by the F7SM bit in address 903.

11 F6HVS

(0) Framer 6 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(663) or Elastic store status for Framer 6 are set. This bit can be masked and will remain low by the F7HM bit in address 903.

10 F6EVS

(0) Framer 6 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(636) or Elastic store status for Framer 5 are set. This bit can be masked and will remain low by the F5EM bit in address 903. 9F 6 R V S (0) Framer 6 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(635) for Framer 6 are set. This bit can be masked and will remain low by the F6RM bit in address 903. 8F 6 S V S (0) Framer 6 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Counter status register(634) for Framer 6 are set. This bit can be masked and will remain low by the F6SM bit in address 903. 7F 5 H V S (0) Framer 3 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(533) or Elastic store status for Framer 5 are set. This bit can be masked and will remain low by the F7HM bit in address 903. 6F 5 E V S (0) Framer 5 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(536) or Elastic store status for Framer 5 are set. This bit can be masked and will remain low by the F5EM bit in address 903. 5F 5 R V S (0) Framer 5 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(535) are Framer 5 are set. This bit can be masked and will remain low by theF1RM bit in address 903. 4F 5 S V S (0) Framer 5 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(534) for Framer 5 are set. This bit can be masked and will remain low by the F1SM bit in address 903. 3F 4 H V S (0) Framer 4 HDLC Vector Status. This bit if unmasked is set if any of the bits in the HDLC status register(433)status for Framer 4 are set. This bit can be masked and will remain low by the F7HM bit in address 903. Table 125 - Interrupt Vector 2 Status Register (Address 911) (T1)

Zarlink Semiconductor Inc. 2F 4 E V S (0) Framer 4 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(436) or Elastic store status for Framer 4 are set. This bit can be masked and will remain low by the F4EM bit in address 903. 1F 4 R V S (0) Framer 4 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(435) for Framer 4 are set. This bit can be masked and will remain low by the F4RM bit in address 903. 0F 4 S V S (0) Framer 4 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(434) Framer 4 are set. This bit can be masked and will remain low by the F4SM bit in address 903. Bit Name Functional Description 15-3 ID15-3 ID Number. Contains 0100000001011. 2-0 ID2-0 (000) These 3 bits make up a binary code which identify the revision of this device. Table 126 - Identification Revision Code Data Register (Address 912) (T1) Bit Name Functional Description 15-1 # not used. 0S T I S (0) ST-BUS Analyser Interrupt Status. This bit is set if the ST-BUS Analyser is filled up. Table 127 - ST-BUS Analyzer Vector Status Register (Address 913) (T1) Bit Name Functional Description 15-8 # not used. 7-0 STAD (7-0) (0) ST-BUS Analyser Data. This is the data for the ST-BUS analyser buffer. 920 is the first byte of the data that is being "analyzed". The source of the data can be any ST-Bus stream from any Framer. Table 128 - ST-BUS Analyser Data(Address 920-93F) (T1) Bit Name Functional Description Table 125 - Interrupt Vector 2 Status Register (Address 911) (T1)

Zarlink Semiconductor Inc.

17.2 E1 Register Set

17.2.1 Register Address (000 - FFF) Summaries

17.2.1.1 Framer Address (000-FFF) Summary

(A11-A0) Hex Address Framer Accessed 0000 xxxx xxxx 0XX 0 0001 xxxx xxxx 1XX 1 0010 xxxx xxxx 2XX 2 0011 xxxx xxxx 3XX 3 0100 xxxx xxxx 4XX 4 0101 xxxx xxxx 5XX 5 0110 xxxx xxxx 6XX 6 0111 xxxx xxxx 7XX 7 1000 xxxx xxxx 1001 xxxx xxxx 8XX 900 901 902 903 904 905 910 911 912 913 920-93F 0 - 7, this performs an all framer write to register XX, except for the following addresses which are common to all 8 framers: Global Control 0(R/W) Global Control 1(R/W) Interrupt Vector 1 Mask Register (R/W) Interrupt Vector 2 Mask Register (R/W) Framer Loopback Register (R/W) ST-BUS Analyser Interrupt Mask Register Interrupt Vector1 Status Register(R) Interrupt Vector2 Status Register(R) ID Register (R) ST-BUS Analyser Interrupt Status Register ST-BUS Analyser Data 1010 0100 0000 - 1111 1111 1111 940 - FFF not used xxxx indicates all (0000 to 1111) binary possibilities X indicates all (0 to F) hex possibilities Table 129 - Framer Addressing (000 - FFF) (E1)

Zarlink Semiconductor Inc.

17.2.1.2 Register Group Address (Y00 - YFF) Summary

(A10-A0) Hex Address Register Group Accessed Processor Access ST-BUS Access yyyy 0000 xxxx Y0X,YFX Master Control R/W --- yyyy 0001 xxxx Y1X Master Status R --- yyyy 0010 xxxx Y2X Latched Status R --- yyyy 0011 xxxx Y3X Interrupt Status R --- yyyy 0100 xxxx Y4X Interrupt Mask Control R/W --- yyyy 0101 xxxx Y5X-Y6X Transmit CAS Data R/W CSTi yyyy 0110 xxxx Y7X-Y8X Receive CAS Data R CSTo yyyy 0111 xxxx- yyyy 1000 xxxx Y9X-YAX Timeslot 0-31 Control R/W --- yyyy 1001xxxx YB0-YBF Transmit National Bit Buffers R/W yyyy 1010 xxxx YC0-YCF Receive National Bit Buffers R yyyy indicates 9 binary (0000 to 1000) possibilities, 0000 to 0111 representing a read or write to1 of 8 framers, 1000 representing a write only to all framers, or a read/write to one of the common registers (904,912,910, 911,902,903) Y is the hex equivalent of yyyy xxxx indicates all (0000 to 1111) binary possibilities X is the hex equivalent of xxxx Table 130 - Register Group Address (Y00 - YFF) Summary (E1)

Zarlink Semiconductor Inc.

17.2.1.3 Global Control and Status Register (900-91F) Summary

(A11-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) 1001 0000 0000 900 R/W Global Control0 T1Eo, STBUS ,#,#,#,#,#,#,#,#,#,CK1,#,#,#,RSTC 1001 0000 0001 901 R/W Global Control1 CHANNUM(4:0),STBUFEN,FRNUM(2:0),CHUP,CONTSI N 1001 0000 0000 902 R/W Interrupt Vector Mask Register F3HM, F3NM, F3CM, F3SM, F2HM, F2NM, F2CM, F2SM, F1HM, F1NM, F1CM, F1SM, F0HM, F0NM, F0CM, F0SM 1001 0000 0011 903 R/W Interrupt Vector MaskRegister F7HM,F7NM,F7CM,F7SM,F6HM,F6NM,F6CM,F6SM, F5HM,F5NM,F5CM,F5SM,F4HM,F4NM,F4CM,F4SM 1001 0000 1000 904 R/W Framer Loopback Global Register SLBK8, SLBK67, SLBK45, SLBK23, SLBK01, RLBK8, RLBK67, RLBK45, RLBK23, RLBK01,#, #, #,#,# 1001 0000 0101- 1001 0000 1111 906-90F R/W not used not used 1001 0001 0000 910 R Interrupt Vector Status 0 F3HS,F3EVS, F3RVS, F3SVS,F2HS, F2EVS, F2RVS, F2SVS, F1HS,F1EVS, F1RVS, F1SVS,F0HS, F0EVS, F0RVS F0SVS 1001 0001 0001 911 R Interrupt Vector Status1 F7HS,F7EVS, F7RVS, F7SVS,F6HS, F6EVS, F6RVS, F6SVS, F5HS,F5EVS, F5RVS, F5SVS,F4HS, F4EVS, F4RVS F4SVS 1001 0001 0010 912 R Identification Code Status

913 R ST-Bus Analyser

STAD(7:0) # indicates unused bits in register that may be any value if read Table 131 - Register Group Address (Y00 - YFF) Summary (E1)

Zarlink Semiconductor Inc.

17.2.2 Register Address (Y00 - YFF) Summary

Tables 137 to 146 provide a summary of each of the framer registers for the MT9072.

17.2.2.1 Master Control Registers Address (Y00-Y0F, YF0-YFF) Summary

(A10-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) yyyy 0000 0000 Y00 R/W Alarms and Framing Control IMA, ASEL, ARAI, TALM, TAIS, TAIS0, TAI16, TE, TIU0, TIU1, CSYN, REFRM, AUTC, CRCM, AUTY, MFRF yyyy 0000 0001 Y01 R/W Test, Loopback and Error Control #, #, L32Z, ADSEQ, DLBK, RLBK, SLBK, PLBK, E1, E2, BVE, CRCE, FASE, NFSE, LOSE, PERR yyyy 0000 0010 Y02 R/W Interrupts and I/O Control COD1, COD0, THDB3, T2OP, MFBE,Tx8KEN, SPND, INTA,CLKE, RHDB3, RxBFE, RxDO, RxCO, CSToE, DSToE, MFSEL yyyy 0000 0011 Y03 R/W DL, CCS, CAS & Other Control #, ELAS, ACCLR, RxTRS, TxTRS, CSIG, CNCLR, RST yyyy 0000 0100 Y04 R/W Signaling InterruptPeriod yyyy 0000 0101 Y05 R/W CAS Control and Data TMA1, TMA2, TMA3, TMA4, X1, Y, X2, X3 yyyy 0000 0110 Y06 R/W HDLC &CCS ST-BUS Control # ,#,#,#,HCH4:0,HPAYSEL,#,#,#,#,TS31E, TS16E, TS15E yyyy 0000 0111 Y07 R/W CCS to ST-BUS Map Control #, 31C4, 31C3, 31C2, 31C1, 31C0, 16C4, 16C3 16C2, 16C1, 16C0, 15C4, 15C3, 15C2, 15C1, 15C0 yyyy 00001000 Y08 R/W DataLink Control Word Sa4SS1-0,Sa5SS1-0,Sa6SS1-0,Sa7SS1-0, Sa8SS1-0,#,#,#E4CK,DLCK yyyy 00001001 Y09 R/W Receive Idle Code Word yyyy 00001010 Y0A R/W Transmit Idle CodeWord yyyy 0000 1001- yyyy 0000 1111 Y0B-Y0F - not used - yyyy 1111 0000- yyyy 1111 0001 YF0-YF1 - not used yyyy 1111 0010 YF2 R/W HDLC Control 0 #,#,# ,#,ADREC,RXEN,TXEN,EOP,FA,MI,CYCLE,TCRCI, SEVEN,RXFRST,TXFRST yyyy 1111 0011 YF3 R/W HDLC Test Control RTLoop,CRCTST,FTST,ADTST,HLOOP yyyy 1111 0100 YF4 R/W Address Recognition #,ADRM26-20,A2EN,ADRM16-10,AEN Table 132 - Master Control Register (R/W) Address (Y0X) Summary (E1)

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17.2.2.2 Master Status Registers Address (Y10-Y1F) Summary

yyyy 1111 0101 YF5 R/W TXFIFO 7-0 #,#,#,#,#,#,#,#,TXFIFO7-0 yyyy 1111 0110 YF6 R/W TX Byte Count #,#,#,#,#,#,#,#,CNT7-0 # indicates the unused bits in the register that may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Binary Address (A10-A0) Hex Address R/W Register Status Bits (B15 - B8 / B7 - B0) yyyy 0001 0000 Y10 R Synchronization & CRC-4 Remote Status #, RSLP, RSLPD, BSYNC, MSYNC, CSYNC, RED, CEFS, #, RCRC0, RCRC1, RFAIL, REB1-2, RCRCR, CRCIW yyyy 0001 0001 Y11 R CRC-4 Timers & CRC-4 Local Status #, #,#, TWOSEC, T1, T2, T400, T8, #, #, #, CALN, CRCRF, CRCS1, CRCS2, # yyyy 0001 0010 Y12 R Alarms & MAS Status #, AI SP, KLVE, LOSS, AIS16, AIS, RAI, AUXP, RMA1-4, X1, Y, X2, X3 yyyy 0001 0011 Y13 R NFAS & FAS Status RIU1, RNFA, RAI, RNU4-8, RIU0, RFA2-8 yyyy 0001 0100 Y14 R Phase Indicator Status PI7-0 yyyy 0001 0101 Y15 R/W PRBS Error Counter & PRBS CRC-4 MF Counter PEC7-0,PCC7-0 yyyy 0001 0110 Y16 R/W Loss of Sync Counter with Auto Clear SLC15-8,SLC7-0 yyyy 0001 0111 Y17 R/W E-bit Error Counter EEC15-8,EEC7-0 yyyy 0001 1000 Y18 R/W BPV Error Counter VEC15-8, VEC7-0 yyyy 0001 1001 Y19 R/W CRC-4 Error Counter CEC15-8, CEC7-0 yyyy 0001 1010 Y1A R/W FAS Bit Error Counter FAS Error Counter BEC7-0 FEC7-0 yyyy 0001 1011 Y1B R/W not used yyyy 0001 1100 Y1C R/W TX Byte Counter Position and HDLC Test Status #,#,#,#,RXclk,TXclk,Vcrc,Vaddr,TBP7:0 yyyy 0001 1101 Y1D R/W HDLC Status IDC,RQ9-8,TXSTAT1-0,RXSTA1-0 Table 133 - Master Status Register (R) Address (Y1X) Summary (E1) Binary Address 10-A0) Hex Address R/W Register Control Bits (B15 - B8 / B7 - B0) Table 132 - Master Control Register (R/W) Address (Y0X) Summary (E1)

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17.2.2.3 Latched Status Registers Address (Y20-Y2F) Summary

yyyy 0001 1110 Y1E R/W RX CRC CRC15-0 yyyy 0001 1111 Y1F R/W RX FIFO #,#,#,#,#,#,#,#,RXFIFO7-0 # indicates the unused bits in the register that may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Binary Address (A10-A0) Hex Address R/W Latched Status Register Status Bits (B15 - B8 / B7 - B0) yyyy 0010 0000- yyyy 0010 0011 Y20-Y23 - not used not used yyyy 0010 0100 Y24 R Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) CASRL, RCRCRL, RSLPL, YL, AUXPL, RAIL, AISL, AIS16L, LOSSL, RCRC0L, RCRC1L, CEFSL, RFAILL, CSYNCL, MSYNCL, BSYNCL yyyy 0001 0101 Y25 R Counter (Counter Indication and Counter Overflow) SLOL, 0, FEOL, FEIL, BEOL, BEIL, CEOL, CEIL, VEOL, VEIL, EEOL, EEIL, PCO, 0, PEOL, PEIL yyyy 0001 0110 Y26 R National (CAS, National, CRC-4 Local and Timers) 0, Sa5VL, Sa6V3L, Sa6V2L, Sa6V1L, Sa6V0L, Sa6N8L, Sa6NL, SaNL, Sa5TL, SaTL, CASRL, CALNL, T2L, T1L, ONESECL yyyy 0001 0111 Y27 R Performance Persistent Latch #, #, #, #, RAISP , AISP, LOSSP, BSYNCP yyyy 0001 1000 Y28 R E-bit Error Count Latch EEL15-8, EEL7-0 yyyy 0001 1001 Y29 R BPV Error C ount Latch VEL15-8, VEL7-0 yyyy 0001 1010 Y2A R CRC-4 Error Count Latch CEL15-8, CEL7-0 yyyy 0001 1011 Y2B R FAS Bit Error Count Latch FAS Error Count Latch BEL7-0 FEL7-0 yyyy 0010 1100- yyyy 0010 1111 Y2C-Y2F - not used not used # indicates the unused bits in the register that may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Table 134 - Latched Status Register (R) Address (Y2X) Summary (E1) Binary Address 10-A0) Hex Address R/W Register Status Bits (B15 - B8 / B7 - B0) Table 133 - Master Status Register (R) Address (Y1X) Summary (E1)

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17.2.2.4 Interrupt Status Registers Address Summary(Y3X)

(A10-A0) Hex Address R/W Interrupt Status Register Status Bits (B15 - B8 / B7 - B0) 1000 0011 0000

910 R Vector 1 F3HI, F3NI, F3CI, F3SI, F2HI, F2NI, F2CI, F2SI,

F1HI, F1NI, F1CI, F1SI, F0HI, F0NI, F0CI, F0SI 1000 0011 0001

911 R Vector 2 F7HI, F7NI, F7CI, F7SI, F6HI, F6NI, F6CI, F6SI,

F5HI, F5NI, F5CI, F5SI, F4HI, F4NI, F4CI, F4SI Y33 R HDLC Interrupt Status GAI,EOPDI ,TEOPI,EOPRI,TXFLI,FAI,TXUNDERI, RXFFI,RXOVFLI yyyy 0011 0100 Y34 R Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) # RCRCRI, RSLPI, YI, AUXPI, RAII, AISI, AIS16I, LOSSI, RCRC0I, RCRC1I, CEFSI, RFAILI, CSYNCI, MSYNCI, BSYNCI yyyy 0011 0101 Y35 R Counter (Counter Indication and Counter Overflow) SLOI, 0, FEOI, FEII, BEOI, BEII, CEOI, CEII, VEOI, VEII, EEOI, EEII, PCOI, 0, PEOI, PEII yyyy 0011 0110 Y36 R National (CAS, National, CRC-4 Local and Timers) Sa5VI, Sa6V3I, Sa6V2I, Sa6V1I, Sa6V0I, Sa6N8I, Sa6NI, SaNI, Sa5TI, SaTI, #, CALNI, T2I, T1I, ONESECI yyyy 0011 0111- yyyy 0011 1111 Y37-Y3F - not used not used # indicates the unused bits in the register that may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Table 135 - Interrupt Status Register (R) Address Summary (E1)

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17.2.2.5 Interrupt Mask Registers Address Summary(Y4X)

(A10-A0) Hex Address R/W Interrupt Mask Register Control Bits (B15 - B8 / B7 - B0) yyyy 0100 0011 Y43 R HDLC Interrupt Mask GAIM,EOPDIM,TEOPIM,EOPRIM,TXFLIM,FAIM,TX UNDERIM,RXFFIM,RXOVFLIM yyyy 0100 0100 Y44 R/W Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) CASRM, RCRCRM, RSLPM, YM, AUXPM, RAIM, AISM, AIS16M, LOSSM, RCRC0M, RCRC1M, CEFSM, RFAILM, CSYNCM, MSYNCM, BSYNCM yyyy 0100 0101 Y45 R/W Counter (Counter Indication and Counter Overflow) SLOM, #M, FEOM, FEIM, BEOM, BEIM, CEOM, CEIM, VEOM, VEIM, EEOM, EEIM, PCOM, #, PEOM, PEIM yyyy 0100 0110 Y46 R/W National (CAS, National, CRC-4 Local and Timers) Sa5VM, Sa6V3M, Sa6V2M, Sa6V1M, Sa6V0M, Sa6N8M, Sa6NM,SaNM, Sa5TM, SaTM, #, CALNM, T2M, T1M, ONESECM yyyy 0100 0111- yyyy 0100 1111 Y47-Y4F - not used not used # indicates the unused bits in the register that may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Table 136 - Interrupt Mask Register (R/W) Address Summary (E1)

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17.2.2.6 Transmit CAS Data Registers Address (Y50-Y6F) Summary

(A10-A0) Hex Address Register Data Bits (Upper bits B15 - B4 unused, B3 - B0 are shown) yyyy 0101 0000 Y50 not used not used yyyy 0101 0001 Y51 Channel 1 Transmit CAS Data A1, B1, C1, D1 yyyy 0101 0010 Y52 Channel 2 Transmit CAS Data A2, B2, C2, D2 yyyy 0101 0011 Y53 Channel 3 Transmit CAS Data A3, B3, C3, D3 yyyy 0101 0100 Y54 Channel 4 Transmit CAS Data A4, B4, C4, D4 yyyy 0101 0101 Y55 Channel 5 Transmit CAS Data A5, B5, C5, D5 yyyy 0101 0110 Y56 Channel 6 Transmit CAS Data A6, B6, C6, D6 yyyy 0101 0111 Y57 Channel 7 Transmit CAS Data A7, B7, C7, D7 yyyy 0101 1000 Y58 Channel 8 Transmit CAS Data A8, B8, C8, D8 yyyy 0101 1001 Y59 Channel 9 Transmit CAS Data A9, B9, C9, D9 yyyy 0101 1010 Y5A Channel 10 Transmit CAS Data A10, B10, C10, D10 yyyy 0101 1011 Y5B Channel 11 Transmit CAS Data A11, B11, C11, D11 yyyy 0101 1100 Y5C Channel 12 Transmit CAS Data A12, B12, C12, D12 yyyy 0101 1101 Y5D Channel 13 Transmit CAS Data A13, B13, C13, D13 yyyy 0101 1110 Y5E Channel 14 Transmit CAS Data A14, B14, C14, D14 yyyy 0101 1111 Y5F Channel 15 Transmit CAS Data A15, B15, C15, D15 yyyy 0110 0000 Y60 not used not used yyyy 0110 0001 Y61 Channel 16 Transmit CAS Data A16, B16, C16, D16 yyyy 0110 0010 Y62 Channel 17 Transmit CAS Data A17, B17, C17, D17 yyyy 0110 0011 Y63 Channel 18 Transmit CAS Data A18, B18, C18, D18 yyyy 0110 0100 Y64 Channel 19 Transmit CAS Data A19, B19, C19, D19 yyyy 0110 0101 Y65 Channel 20 Transmit CAS Data A20, B20, C20, D20 yyyy 0110 0110 Y66 Channel 21 Transmit CAS Data A21, B21, C21, D21 yyyy 0110 0111 Y67 Channel 22 Transmit CAS Data A22, B22, C22, D22 yyyy 0110 1000 Y68 Channel 23 Transmit CAS Data A23, B23, C23, D23 yyyy 0110 1001 Y69 Channel 24 Transmit CAS Data A24, B24, C24, D24 Table 137 - Transmit CAS Data Register (R/W) Address (Y5X,Y6X) Summary (E1)

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17.2.2.7 Receive CAS Data Registers Address (Y70-Y8F) Summary

yyyy 0110 1010 Y6A Channel 25 Transmit CAS Data A25, B25, C25, D25 yyyy 0110 1011 Y6B Channel 26 Transmit CAS Data A26, B26, C26, D26 yyyy 0110 1100 Y6C Channel 27 Transmit CAS Data A27, B27, C27, D27 yyyy 0110 1101 Y6D Channel 28 Transmit CAS Data A28, B28, C28, D28 yyyy 0110 1110 Y6E Channel 29 Transmit CAS Data A29, B29, C29, D29 yyyy 0110 1111 Y6F Channel 30 Transmit CAS Data A30, B30, C30, D30 upper data bits (B15-4) are not used and may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Note that this registers are useable if the corresponding MPST bits in the per timeslot control are set. Binary Address (A10-A0) Hex Address Register Data Bits (Upper bits B15 - B4 unused, B3 - B0 are shown) yyyy 0111 0000 Y70 not used not used yyyy 0111 0001 Y71 Channel 1 Receive CAS Data A1, B1, C1, D1 yyyy 0111 0010 Y72 Channel 2 Receive CAS Data A2, B2, C2, D2 yyyy 0111 0011 Y73 Channel 3 Receive CAS Data A3, B3, C3, D3 yyyy 0111 0100 Y74 Channel 4 Receive CAS Data A4, B4, C4, D4 yyyy 0111 0101 Y75 Channel 5 Receive CAS Data A5, B5, C5, D5 yyyy 0111 0110 Y76 Channel 6 Receive CAS Data A6, B6, C6, D6 yyyy 0111 0111 Y77 Channel 7 Receive CAS Data A7, B7, C7, D7 yyyy 0111 1000 Y78 Channel 8 Receive CAS Data A8, B8, C8, D8 yyyy 0111 1001 Y79 Channel 9 Receive CAS Data A9, B9, C9, D9 yyyy 0111 1010 Y7A Channel 10 Receive CAS Data A10, B10, C10, D10 yyyy 0111 1011 Y7B Channel 11 Receive CAS Data A11, B11, C11, D11 yyyy 0111 1100 Y7C Channel 12 Receive CAS Data A12, B12, C12, D12 yyyy 0111 1101 Y7D Channel 13 Receive CAS Data A13, B13, C13, D13 yyyy 0111 1110 Y7E Channel 14 Receive CAS Data A14, B14, C14, D14 yyyy 0111 1111 Y7F Channel 15 Receive CAS Data A15, B15, C15, D15 yyyy 1000 0000 Y80 not used not used Table 138 - Receive CAS Data Register (R) Address (Y7X,Y8X) Summary (E1) Binary Addres (A10-A0) Hex Address Register Data Bits (Upper bits B15 - B4 unused, B3 - B0 are shown) Table 137 - Transmit CAS Data Register (R/W) Address (Y5X,Y6X) Summary (E1) (continued)

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17.2.2.8 Timeslot 0-31 Control Registers Address (Y90-YAF) Summary

yyyy 1000 0001 Y81 Channel 16 Receive CAS Data A16, B16, C16, D16 yyyy 1000 0010 Y82 Channel 17 Receive CAS Data A17, B17, C17, D17 yyyy 1000 0011 Y83 Channel 18 Receive CAS Data A18, B18, C18, D18 yyyy 1000 0100 Y84 Channel 19 Receive CAS Data A19, B19, C19, D19 yyyy 1000 0101 Y85 Channel 20 Receive CAS Data A20, B20, C20, D20 yyyy 1000 0110 Y86 Channel 21 Receive CAS Data A21, B21, C21, D21 yyyy 1000 0111 Y87 Channel 22 Receive CAS Data A22, B22, C22, D22 yyyy 1000 1000 Y88 Channel 23 Receive CAS Data A23, B23, C23, D23 yyyy 1000 1001 Y89 Channel 24 Receive CAS Data A24, B24, C24, D24 yyyy 1000 1010 Y8A Channel 25 Receive CAS Data A25, B25, C25, D25 yyyy 1000 1011 Y8B Channel 26 Receive CAS Data A26, B26, C26, D26 yyyy 1000 1100 Y8C Channel 27 Receive CAS Data A27, B27, C27, D27 yyyy 1000 1101 Y8D Channel 28 Receive CAS Data A28, B28, C28, D28 yyyy 1000 1110 Y8E Channel 29 Receive CAS Data A29, B29, C29, D29 yyyy 1000 1111 Y8F Channel 30 Receive CAS Data A30, B30, C30, D30 upper data bits (B15-4) are not used and may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Binary Address 10-A0) Hex Address Register Control Bits (Upper byte B15 - B8 unused, B8 - B0 are shown) yyyy 1001 0000 Y90 Timeslot 0 Control Set to 0 yyyy 1001 0001 Y91 Timeslot 1 Control RADI1,M PDR1,MPDR1,CASS1, TADI1, RTSL1, LTSL1, TTST1, RRST1, MPDT1, # yyyy 1001 0010 Y92 Timeslot 2 Control RADI2,M PDR2,MPDR2,CASS2, TADI2, RTSL2, LTSL2, TTST2, RRST2, MPDT2, # yyyy 1001 0011 Y93 Timeslot 3 Control RADI3,M PDR3,MPDR3,CASS3,T ADI3, RTSL3, LTSL3, TTST3, RRST3, MPDT3, # yyyy 1001 0100 Y94 Timeslot 4 Control RADI4,M PDR4,MPDR4,CASS4, TADI4, RTSL4, LTSL4, TTST4, RRST4, MPDT4, # yyyy 1001 0101 Y95 Timeslot 5 Control RADI5,M PDR5,MPDR5,CASS5, TADI5, RTSL5, LTSL5, TTST5, RRST5, MPDT5, # Table 139 - Timeslot 0-31 Control Register (R/W) Address (Y9X, YAX) Summary (E1) Binary Address (A10-A0) Hex Address Register Data Bits (Upper bits B15 - B4 unused, B3 - B0 are shown) Table 138 - Receive CAS Data Register (R) Address (Y7X,Y8X) Summary (E1)

Zarlink Semiconductor Inc. yyyy 1001 0110 Y96 Timeslot 6 Control RADI6,M PDR6,MPDR6,CASS6, TADI6, RTSL6, LTSL6, TTST6, RRST6, MPDT6, # yyyy 1001 0111 Y97 Timeslot 7 Control RADI7,M PDR7,MPDR7,CASS7, TADI7, RTSL7, LTSL7, TTST7, RRST7, MPDT7, # yyyy 1001 1000 Y98 Timeslot 8 Control RADI8,M PDR8,MPDR8,CASS8, TADI8, RTSL8, LTSL8, TTST8, RRST8, MPDT8, # yyyy 1001 1001 Y99 Timeslot 9 Control RADI9,M PDR9,MPDR9,CASS9, TADI9, RTSL9, LTSL9, TTST9, RRST9, MPDT9, # yyyy 1001 1010 Y9A Timeslot 10 Control RADI 10,MPDR10,MPDR10,CASS10,T ADI10, RTSL10, LTSL10, TTST10, RRST10, MPDT10, # yyyy 1001 1011 Y9B Timeslot 11 Control RADI11,MPDR11,MPDR11,CASS11,T ADI11, RTSL11, LTSL11, TTST11, RRST11, MPDT11, # yyyy 1001 1100 Y9C Timeslot 12 Control RADI 12,MPDR12,MPDR12,CASS12, TADI12, RTSL12, LTSL12, TTST12, RRST12, MPDT12, # yyyy 1001 1101 Y9D Timeslot 13 Control RADI 13,MPDR13,MPDR13,CASS13, TADI13, RTSL13, LTSL13, TTST13, RRST13, MPDT13, # yyyy 1001 1110 Y9E Timeslot 14 Control RADI 14,MPDR14,MPDR14,CASS14, TADI14, RTSL14, LTSL14, TTST14, RRST14, MPDT14, # yyyy 1001 1111 Y9F Timeslot 15 Control RADI 15,MPDR15,MPDR15,CASS15, TADI15, RTSL15, LTSL15, TTST15, RRST15, MPDT15, # yyyy 1010 0000 YA0 Timeslot 16 Control RADI 16,MPDR16,MPDR16,CASS16, TADI16, RTSL16, LTSL16, TTST16, RRST16, MPDT16, # yyyy 1010 0001 YA1 Timeslot 17 Control RADI 17,MPDR17,MPDR17,CASS17, TADI17, RTSL17, LTSL17, TTST17, RRST17, MPDT17, # yyyy 1010 0010 YA2 Timeslot 18 Control RADI 18,MPDR18,MPDR18,CASS18, TADI18, RTSL18, LTSL18, TTST18, RRST18, MPDT18, # yyyy 1010 0011 YA3 Timeslot 19 Control RADI 19,MPDR19,MPDR19,CASS19, TADI19, RTSL19, LTSL19, TTST19, RRST19, MPDT19, # yyyy 1010 0100 YA4 Timeslot 20 Control RADI 20,MPDR20,MPDR20,CASS20, TADI20, RTSL20, LTSL20, TTST20, RRST20, MPDT20, # yyyy 1010 0101 YA5 Timeslot 21 Control RADI 21,MPDR21,MPDR21,CASS21, TADI21, RTSL21, LTSL21, TTST21, RRST21, MPDT21, # yyyy 1010 0110 YA6 Timeslot 22 Control RADI 22,MPDR22,MPST22,CASS22, TADI22, RTSL22, LTSL22, TTST22, RRST22, MPDT22, # yyyy 1010 0111 YA7 Timeslot 23 Control RADI 23,MPDT23,MPDR23,CASS23, TADI23, RTSL23, LTSL23, TTST23, RRST23, MPDT23, # yyyy 1010 1000 YA8 Timeslot 24 Control RADI 24,MPDT24,MPDR24,CASS24, TADI24, RTSL24, LTSL24, TTST24, RRST24, MPDT24, # Binary Address (A10-A0) Hex Address Register Control Bits (Upper byte B15 - B8 unused, B8 - B0 are shown) Table 139 - Timeslot 0-31 Control Register (R/W) Address (Y9X, YAX) Summary (E1)

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17.2.2.9 Transmit National Bit Data Register(R/W) Address(YB0 to YB4) Summary

yyyy 1010 1001 YA9 Timeslot 25 Control RADI 25,MPDT25,MPDR25,CASS25, TADI25, RTSL25, LTSL25, TTST25, RRST25, MPDT25, # yyyy 1010 1010 YAA Timeslot 26 Control RADI 26,MPDT26,MPDR26,CASS26, TADI26, RTSL26, LTSL26, TTST26, RRST26, MPDT26, # yyyy 1010 1011 YAB Timeslot 27 Control RADI 27,MPDT27,MPDR27,CASS27, TADI27, RTSL27, LTSL27, TTST27, RRST27, MPDT27, # yyyy 1010 1100 YAC Timeslot 28 Control RADI 28,MPDT28,MPDR28,CASS28, TADI28, RTSL28, LTSL28, TTST28, RRST28, MPDT28, # yyyy 1010 1101 YAD Timeslot 29 Control RADI 29,MPDT29,MPDR29,CASS29, TADI29, RTSL29, LTSL29, TTST29, RRST29, MPDT29, # yyyy 1010 1110 YAE Timeslot 30 Control RADI 30,MPDT30,MPDR30,CASS30, TADI30, RTSL30, LTSL30, TTST30, RRST30, MPDT30, # yyyy 1010 1111 YAF Timeslot 31 Control RADI 31,MPDT31,MPDR31,CASS31,TADI31, RTSL31, LTSL31, TTST31, RRST31, MPDT31, # upper data byte (B15-8) is not used and may be any value if read # indicates the unused bits in the register that may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Binary Address (A10-A0) Hex Address Register Data Bits (Upper byte B15 - B8 unused, B7 - B0 are shown) yyyy 1111 1000 YB0 Transmit National Bits TN0 (Sa4) TN0F1, TN0F3, TN0F5, TN0F7, TN0F9, TN0F11, TN0F13, TN0F15 yyyy 1111 1001 YB1 Transmit National Bits TN1 (Sa5) TN1F1, TN1F3, TN1F5, TN1F7, TN1F9, TN1F11, TN1F13, TN1F15 yyyy 1111 1010 YB2 Transmit National Bits TN2 (Sa6) TN2F1, TN2F3, TN2F5, TN2F7, TN2F9, TN2F11, TN2F13, TN2F15 yyyy 1111 1011 YB3 Transmit National Bits TN3 (Sa7) TN3F1, TN3F3, TN3F5, TN3F7, TN3F9, TN3F11, TN3F13, TN3F15 yyyy 1111 0100 YB4 Transmit National Bits TN4 (Sa8) TN4F1, TN4F3, TN4F5, TN4F7, TN4F9, TN4F11, TN4F13, TN4F15 yyyy 1011 0101- yyyy 1011 1111 YB5-YB F not used not used upper data byte (B15-8) is not used and may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Table 140 - Transmit National Bits Data Registers (R/W) Address (YFX) Summary (E1) Binary Address (A10-A0) Hex Address Register Control Bits (Upper byte B15 - B8 unused, B8 - B0 are shown) Table 139 - Timeslot 0-31 Control Register (R/W) Address (Y9X, YAX) Summary (E1)

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17.2.2.10 Receive National Bit Data Register(R/W) Address(YC0 to YC4) Summary

17.2.3 Master Control Regi sters (Y00 - Y09) Bit Functions

Tables 147 to 157 describe the bit functions of each of the Master Control Registers in the MT9072 in E1 Mode. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most si gnificant address bits (MSB) A11-A8). In addition, a simultaneous write to all 8 framers is possible by setting the MSB address to Y=8 (1000). A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible. Binary Address (A10-A0) Hex Address Register Data Bits (Upper byte B15 - B8 unused, B7 - B0 are shown) yyyy 1111 1000 YC0 Receive National Bits RN0 (Sa4) RN0F1, RN0F3, RN0F5, RN0F7, RN0F9, RN0F11, RN0F13, RN0F15 yyyy 1111 1001 YC1 Receive National Bits RN1 (Sa5) RN1F1, RN1F3, RN1F5, RN1F7, RN1F9, RN1F11, RN1F13, RN1F15 yyyy 1111 1010 YC2 Receive National Bits RN2 (Sa6) RN2F1, RN2F3, RN2F5, RN2F7, RN2F9, RN2F11, RN2F13, RN2F15 yyyy 1111 1011 YC3 Receive National Bits RN3 (Sa7) RN3F1, RN3F3, RN3F5, RN3F7, RN3F9, RN3F11, RN3F13, RN3F15 yyyy 1111 0100 YC4 Receive National Bits RN4 (Sa8) RN4F1, RN4F3, RN4F5, RN4F7, RN4F9, RN4F11, RN4F13, RN4F15 yyyy 1011 0101- yyyy 1011 1111 YC5-YC F not used not used upper data byte (B15-8) is not used and may be any value if read see the Register Group Address Summary for an explanation of yyyy and Y Table 141 - Transmit National Bits Data Registers (R/W) Address (YFX) Summary (E1) Bit Name Functional Description 15 IMA Inverse Mux for ATM Mode. Setting this bit high the I/O ports to allow for easy connection to one of the Zarlink IMA devices such as the MT90220. DSTi becomes a serial 2.048 data stream. C4b becomes a 4.096 MHz clock that clocks DSTi as the St-Bus. RXFPB becomes a framing pulse that flags the E1 stream coming from the pin DSTo. The data from DSTo is clocked out on RXDLC. Set this pin low for all other applications. Note that signalling operations CSTi/CSTo do not function with the IMA Mode. The global control register 900 bit CK1 is ignored for this framer. 8.192 Mbit/s backplane mode is not supported if IMA mode is selected on any one framer.

14 ASEL

(0) AIS Select. This bit selects the criteria on which the detection of a valid alarm indication signal (AIS=1 of register address Y11) is based. If zero, the criteria is fewer than three zeros in a two frame period (512 bits). If one, the criteria is fewer than three zeros in each of two consecutive double-frame periods (512 bits per double-frame). Table 142 - Alarm and Framing Control Register Y00 (R/W Address Y00) (E1)

Zarlink Semiconductor Inc.

13 ARAI

(0) Automatic Remote Alarm Indication (RAI) Operation. This bit determines the source for the Remote Alarm Indication bit (the A bit) of the transmit PCM30 signal (time-slot 0 bit 3 of NFAS frames). If zero, the source for the A bit is the RAI bit of the Timer and Alarm Status Register (address Y11), and consequently, will change automatically. That is, A=0 when basic synchronization has been acquired (RAI=0), and A=1 when basic synchronization has not been acquired (RAI=1). If the ARAI bit is set to one, the A bit is controlled through the TALM control bit (register address Y00).

12 TALM

(0) Transmit Remote Alarm. This bit is the source for the Remote Alarm Indication bit (the A bit) of the transmit PCM30 signal (timeslot 0 bit 3 of NFAS frames) when the ARAI control bit (register address Y00) is set to one. The TALM bit is used to signal an alarm to the remote end of the PCM30 link (one - alarm, zero - normal).

11 TAIS

(0) Transmit Alarm Indication Signal. If one, an all ones signal is transmitted in all timeslots except zero and 16. If zero, timeslots function normally.

10 TAIS0

(0) Transmit AIS Timeslot Zero. If one, an all ones signal is transmitted in timeslot zero. If zero, timeslot zero functions normally. 9T A I 1 6 (0) Transmit AIS Timeslot 16. If one, an all ones signal is transmitted in timeslot 16. If zero, timeslot functions normally. 8T E (0) Transmit E bits. If zero, and CRC-4 synchronization is achieved, the PCM30 link E-bits transmit the received CRC-4 comparison results to the distant end of the link, as per G.703. If zero, and CRC-4 synchronization is lost, the E-bits transmit zero. If one, and CRC-4 synchronization is lost the transmit E-bits will be one. 7T I U 0 (0) Transmit International Use Zero. This bit is transmitted on the PCM30 2048 kb/s link in bit position one of time-slot 0 of all the frame-alignment signal (FAS) frames when CRC-4 operation is disabled (CSYN =1 of register address Y00). The TIU0 bit is reserved for international use and should normally be kept at one. If CRC-4 operation is enabled (CSYN=0), this bit is ignored. 6T I U 1 (1) Transmit International Use One. This bit is transmitted on the PCM 30 2048 kb/s link in bit position one of timeslot 0 of all the Non-Frame Alignment Signal (NFAS) frames when CRC-4 operation is disabled (CSYN=1 of register address Y00). The TIU1 bit is reserved for international use and should normally be kept at one. If CRC-4 operation is enabled (CSYN=0), this bit is ignored. 5C S Y N (0) CRC-4 Synchronization. The CSYN bit in combination with AUTC determines the enabling or disabling of the CRC functions for timeslot 0. If one and AUTC (register address Y00) is one the first bits of time-slot 0 for the transmitter are used as international use bits and are programmed by the TIU0 and TIU1bits (register address Y00). If AUTC is a zero, the CRC-4 calculated bits are inserted in the FAS frames as shown in Table 12. Also if AUTC is a one, the CSYN has to be low for the CRC-4 bits to be inserted in the FAS frames. The transmit transparent bit overides the function of this bit for the transmitter. On the receiver side, if AUTC is 1 and CSYN is 0 then more than 914 CRC errors in 1 second will cause a resynchronization and search for a basic frame synchronization. If AUTC is a 1 and CSYN is 1 than CRC errors are ignored. If AUTC is a zero than more than 914 CRC errors in 1 second will result in basic frame reframe. 4R E F R M (0) Reframe. A one-to-zero transition of this bit results in the execution of the reframing function (the search for a new basic frame position). The basic frame alignment pattern is x0011011 in timeslot 0 of alternate frames. Bit Name Functional Description Table 142 - Alarm and Framing Control Register Y00 (R/W Address Y00) (E1)

Zarlink Semiconductor Inc. 3A U T C (0) Automatic CRC-interworking. If zero, automatic CRC-interworking is activated. If one, it is deactivated. See Framing Algorithm section, Table 13 for details. 2C R C M (0) CRC-4 Modification. If one, the transmit CRC-4 remainder is modified when the device is in transmit transparent mode (TxTRS=1 of register address Y03) in accordance with the local datalink. The received CRC-4 remainder from the originating node is modified to reflect only the changes in the local transmit DataLink. If zero, time-slot 0 data from DSTi will not be modified in transmit transparent mode. This feature can used for intermediate nodes where 2 end nodes are commmunicating for framing/signalling and 2 intermediate nodes are sending datalink information in accordance with appendix C of G.706. 1A U T Y (0) Automatic Y-Bit Operation. This bit determines the source for the Remote Multiframe Alarm Indication bit (the Y bit) of the transmit PCM30 signal (time-slot 16 bit 6 of every frame 0 of the CAS multiframe). If zero, the source for the Y bit is the Y bit of the Receive Alignment Signals Status Register (address Y12), and consequently, will change automatically. That is, Y=0 when multiframe alignment has been acquired (Y=0 of status register), and Y=1 when multiframe alignment has not been acquired (Y=1 of status register). If the AUTY bit is set to one, the Y bit is controlled through the Y bit of the CAS Control and Data Register (address Y05). 0M F R F (0) Multiframe Reframe. If one, for at least one frame, and then cleared, the selected framer (Y) will initiate a search for a new signalling multiframe position. Reframing function is activated on the one-to-zero transition of the MFRF bit. The signalling multiframe algorithm will align to the first multiframe alignment signal pattern (MFAS = 0000) it receives in the most significant nibble of channel 16 (status register address Y10 bit MSYNC is zero). Signalling multiframing will be lost when two consecutive multiframes are received in error. Bit Name Functional Description 15-14 # not used.

13 L32Z

(0) Digital Loss of Signal Selection. If one, the threshold for digital loss of signal is 32 successive zeros. If zero, the threshold is set to 192 successive zeros.

12 ADSEQ

(0) Digital Milliwatt or Digital Test Sequence. If one, the A-law digital milliwatt analog test sequence will be selected by the Per Timeslot Control bits TTSTn and RTSTn (register address Y90 to YAF). If zero, the PRBS 215-1 bit error rate test sequence will be selected by the Per Timeslot Control bits TTSTn and RTSTn. The PRBS generator is reset whenever this bit is set to 1.

11 DLBK

(0) Digital Loopback. If one, all timeslots of DSTi are connected to DSTo on the PCM30 side of the selected framer (Y). If zero, this feature is disabled. See Loopbacks section.

10 RLBK

(0) Remote Loopback. If one, all timeslots received on RPOS/RNEG are connected to TPOS/TNEG on the PCM30 side of the selected framer (Y). If zero, this feature is disabled. See Loopbacks section. 9S L B K (0) ST-BUS Loopback. If one, all timeslots of DSTi are connected to DSTo on the ST-BUS side of the selected framer (Y). If zero, this feature is disabled. See Loopbacks section. Table 143 - Test, Error and Loopback Control Register (R/W Address Y01) (E1) Bit Name Functional Description Table 142 - Alarm and Framing Control Register Y00 (R/W Address Y00) (E1)

Zarlink Semiconductor Inc. 8P L B K (0) Payload Loopback. If one, all timeslots received on RPOS/RNEG are connected to TPOS/TNEG on the ST-BUS side(DSTo to DSTi) of the selected framer (Y) (this excludes time-slot 0). Hence the data passes through the receiver and output to DSTo. This DSTo data is looped back to DSTi which is transmitted to TPOS/TNEG by the transmitter. If zero, this feature is disabled. See Loopbacks section. 7E 1 (0) E1 Error Insertion. A zero-to-one transition of this bit inserts a single E1 error into the transmit PCM30 data (bit position 1 of frame 13 of the CRC-4 Multiframe). A one, zero or one-to-zero transition has no function. 6E 2 (0) E2 Error Insertion. A zero-to-one transition of this bit inserts a single E2 error into the transmit PCM30 data (bit position 1 of frame 15 of the CRC-4 Multiframe). A one, zero or one-to-zero transition has no function.

5 BVE

(0) Bipolar Violation Error Insertion. A zero-to-one transition of this bit inserts a single bipolar violation error into the transmit PCM30 data. A one, zero or one-to-zero transition has no function. (0) CRC-4 Error Insertion. A zero-to-one transition of this bit inserts a single CRC-4 error into the transmit PCM30 data. A one, zero or one-to-zero transition has no function.

3 FASE

(0) Frame Alignment Signal Error Insertion. A zero-to-one transition of this bit inserts a single error into the timeslot zero frame alignment signal of the transmit PCM30 data. A one, zero or one-to-zero transition has no function. 2N F S E (0) Non-frame Alignment Signal Error Insertion. A zero-to-one transition of this bit inserts a single error into bit two of the timeslot zero non-frame alignment signal of the transmit PCM30 data. A one, zero or one-to-zero transition has no function. 1L O S E (0) Loss of Signal Error Insertion. If one, the selected framer (Y) transmits an all zeros signal (no pulses) in every PCM30 timeslot, and, the HDB3 control bit (reg address Y02) has no effect. If zero, data is transmitted normally. (0) Payload Error Insertion. A zero-to-one transition of this bit inserts a single error in the transmit payload. A one, zero or one-to-zero transition has no function. Bit Name Functional Description COD1 COD0 (1 0) Line Coding. These two coding select bits determine the transmit and receive coding options as follows. See Figures 64 to 67. COD1 COD0 Function 0 0 RZ (Return to Zero, Dual Rail) 0 1 NRZ (Non-return to Zero, Single Rail) 1 0 NRZB (Non-return to Zero, Dual Rail) 1 1 No function

13 RHDB3

(0) RHDB3 (High Density Bipolar 3) encoding. If zero, HDB3 decoding is enabled in the receive direction. If one, AMI (Alternate Mark Inversion) signal without HDB3 decoding is enabled in the transmit direction. Table 144 - Interrupts and I/O Control Register (R/W Address Y02) (E1) Bit Name Functional Description Table 143 - Test, Error and Loopback Control Register (R/W Address Y01) (E1)

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12 T2OP

(0) T2o Polarity. If one, the TxCL pin will output a 2.048 MHz clock whose rising edge is in the center of the transmitted PCM30 bit cell at the TPOS and TNEG transmit pins. This clock is equivalent to the internal ST-BUS C2 clock. If zero, the TxCL pin will output a 2.048 MHz clock whose falling edge is in the center of the transmitted PCM30 bit cell at the TPOS and TNEG transmit pins. This clock is equivalent to the internal ST-BUS C2 clock.

11 MFBE

(0) Transmit Multiframe Boundary Enable. If one, the TxMF pin will be enabled. If zero, the TxMF pin will be disabled. See the TxMF pin description. 10 Tx8KEN Transmit 8 KHz Enable. If one, the pin RxMF transmits a positive 8 KHz frame pulse synchronous with the serial data stream transmit on TPOS/TNEG. If zero, the pin RxMF transmits a negative frame pulse synchronous with the multiframe boundary of data coming out of DSTo.

9 SPND

(0) Suspend Interrupts. If zero, the selected framers contribution to the IRQ pin output will be a high impedance state, but all interrupt status registers will continue to be updated. If one, the selected framers contribution to the IRQ output will be normal operation. 8I N T A (0) Interrupt Acknowledge. If zero, all interrupt and latched status registers are cleared and the selected framers contribution to the IRQ pin output will be a high impedance state. If one, all interrupt status registers and the selected framers contribution to the IRQ output will be normal operation. 7C L K E (0) Clock Edge. If one then the NRZ data (RPOS/RNEG) is sampled on the rising edge of EXCLi and transmitted on the falling edge of EXCLi. This selection is only applicable in NRZ mode.

6 THDB3

(0) THDB3 (High Density Bipolar 3) Encoding. If zero, HDB3 encoding is enabled in the transmit direction. If one, AMI (Alternate Mark Inversion) signal without HDB3 encoding is enabled in the transmit direction. 5R x B F E (0) Receive Basic Frame Enable. If one, the RxBF pin operates normally. If zero, the RxBF pin is low. 4R x D O (0) Receive DSTo All Ones. If one, the DSTo pin operates normally. If zero, all timeslots (0-31) of DSTo are set to one. 3R x C O (0) Receive CSTo All Ones. If one, the CSTo pin operates normally. If zero, all timeslots (0-31) of CSTo are set to one. 2C S T o E (0) Output CSTo Enable. If one, the CSTo pin operates normally. If zero, CSTo will be at high impedance. In 8.192 Mbit/s mode all CSToE for all framers have to be 0 to obtain high impedance. 1D S T o E (0) Output DSTo Enable. If one, the DSTo pin operates normally. If zero, DSTo will be at high impedance.

0 MFSEL

(0) Multiframe Select. This bit determines which receive multiframe signal (CRC-4 or signaling) the frame pulse at the RxMF pin is aligned with. If zero, the frame pulse at the RxMF pin is aligned with the receive channel associated signaling (CAS) multiframe; if one, the receive CRC-4 multiframe. See Figures 55 & 58. Bit Name Functional Description Table 144 - Interrupts and I/O Control Register (R/W Address Y02) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-7 # not used. 6E L A S (0) Elastic Buffer Enable. When this bit is set to one, the data at DSTo is a 2.048 Mb/s serial output stream which contains all 32 timeslots of the received PCM30 link data after HDB3 decoding. This data does not pass through the elastic buffer and is clocked out with the falling edge of EXCLi. The data at the DSTo pin is identical to the data at the RXDL pin. When this bit is set to zero, the elastic buffer is enabled, and DSTo operates synchronously with the clock at the CKi pin. Note that only RXDLC or the EXCL can be used to clock DSTo data and DSTo data has no relationship to CKi when ELAS is1. 5A C C L R (0) Automatic Counter Clear. When this bit is set to one, all non-latched status counters (address Y15 to Y1A) are cleared automatically by the one second timer bit ONESEC (address Y11) immediately following the counter latch operation (address Y25 to Y2B). If zero, all non-latched status counters operate normally. 4R x T R S (0) Receive Transparent Mode. If one, the framing function is disabled on the receive side. Data coming from the receive line passes through the slip buffer and drives DSTo with an arbitrary alignment. When zero, the receive framing function operates normally. 3T x T R S (0) Transmit Transparent Mode. If one, the MT9072 is in transmit transparent mode where no framing or signaling is imposed on data transmitted from DSTi onto the PCM30 line. In other words, timeslot 0 and timeslot 16 data on the transmit PCM30 link is sourced from the DSTi input. If zero, the MT9072 is in termination mode. 2C S I G (0) CCS and CAS signaling. If one, the MT9072 is in Common Channel signaling (CCS) mode. If zero, the MT9072 is in Channel Associated signaling (CAS) mode.

1 CNCLR

(0) Counter Clear. When this bit is changed from zero to one, all non-latched status counters (address Y15 to Y1A) are cleared. If zero, all non-latched status counters operate normally. 0R S T (0) Reset. When this bit is changed from zero to one, the selected framer (Y) will reset to its default mode. See the Reset Operation section for the default settings. Table 145 - DL, CCS, CAS and Other Control Register (R/W Address Y03) (E1) Bit Name Functional Description 15-2 # not used. 1-0 SIP1-0 Signaling Interrupt Period. These 2 bits determine the signaling Interrupt period due to the Receive signaling changes. This 2 bits determine the duration of the signaling interrupt bit CASRI(Y36). 00 2 msec Period 01 8 msec Period 10 16 msec Period Table 146 - Signaling Period Interrupt Word (R/W Address Y04) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-12 # not used.

11 RFL

(0) Receive Signaling Freeze due to Loss. If one, the receive signaling is frozen if a receive loss of signal is detected. The freeze is cleared upon clearance of Loss.

10 DBNCE

(0) Debounce Select. This bit selects the receive CAS debounce period. If one, 14 ms of debounce is used. There may be as much as 2 ms added to this duration because the state change of the signaling equipment is not synchronous with the PCM30 signaling multiframe. If zero, no debounce is used. 9,8 (00) not used. TMA1 TMA2 TMA3 TMA4 (0000) Transmit Multiframe Alignment Bits One to Four. These bits are transmitted on the PCM30 link, in the Multiframe Alignment Signal (MFAS) positions (one to four of timeslot 16) of frame zero of every Channel Associated signaling (CAS) multiframe. These bits are used by the far end to identify specific frames of a CAS multiframe. TMA1-4 = 0000 for normal operation. 3X 1 (1) Transmit Non-Multiframe Alignment Signal (NMAS) Spare Bit. This bit is transmitted on the PCM30 link in bit position five of timeslot 16 of frame zero of every signaling multiframe. X1 is normally set to one. (1) Transmit Remote Multiframe Alarm Signal. This bit is transmitted on the PCM30 link in bit position six of timeslot 16 of frame zero of every signaling multiframe when control bit AUTY (register address Y00) is set to one. The Y bit is used to indicate the loss of multiframe alignment to the remote end of the link. If one, loss of multiframe alignment; if zero, multiframe alignment acquired. (11) Transmit Non-Multiframe Alignment Signal (NMAS) Spare Bits. These bits are transmitted on the PCM30 link in bit positions seven and eight respectively, of timeslot 16 of frame zero of every signaling multiframe. X2 and X3 are normally set to one. Table 147 - CAS Control and Data Register (R/W Address Y05) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-12 # not used. 11-7 HCH4-0 (0) HDLC Channel 4-0. This 5 bit number specifies the channel time HDLC will be attached to if enabled. Channel 1 is the first channel in the frame. Channel 31 is the last channel available in a E1 frame. If enabled in a channel, HDLC data will be substituted for data from DSTi on the transmit side. Receive data is extracted from the incoming line data before the elastic buffer and decoded by the HDLC receiver. This bits are relevant if HPAYSEL is set. (0) HDLC Payload Select. Set this bit to 1 to attach HDLC0 to a payload timeslot, if zero it is attached to the Facility data link in Timeslot 0 in accordance with selections in Y08. 5-3 # not used

2 TS31E

(0) Time Slot 31 CST Enable. If one, the transmit PCM30 link timeslot 31 data will be sourced from a CSTi timeslot as selected by control bits 31C4 to 31C0 of register address Y07. And, the receive PCM30 link timeslot 31 data will be sourced to both DSTo timeslot 31 and to the above selected CSTo timeslot. This feature is used to link PCM30 CCS data to an external HDLC device through the CSTo and CSTi pins. If zero, the transmit PCM30 link timeslot 31 data will be sourced from DSTi timeslot 31. And, the receive PCM30 link timeslot 31 data will be sourced to DSTo timeslot 31 only. CCS (CSIG =1 of register address Y03) must be selected for these operations to be valid.

1 TS16E

(0) Time Slot 16 CST Enable. If one, the transmit PCM30 link timeslot 16 data will be sourced from a CSTi timeslot as selected by control bits 16C4 to 16C0 of register address Y07. And, the receive PCM30 link timeslot 16 data will be sourced to both DSTo timeslot 16 and to the above selected CSTo timeslot. This feature is used to link PCM30 CCS data to an external HDLC device through the CSTo and CSTi pins. If zero, the transmit PCM30 link timeslot 16 data will be sourced from DSTi timeslot 16. And, the receive PCM30 link timeslot 16 data will be sourced to DSTo timeslot 16 only. CCS (CSIG=1 of register address Y03) must be selected for these operations to be valid.

0 TS15E

(0) Time Slot 15 CST Enable. If one, the transmit PCM30 link timeslot 15 data will be sourced from a CSTi timeslot as selected by control bits 15C4 to 15C0 of register address Y07. And, the receive PCM30 link timeslot 15 data will be sourced to both DSTo timeslot 15 and to the above selected CSTo timeslot. This feature is used to link PCM30 CCS data to an external HDLC device through the CSTo and CSTi pins. If zero, the transmit PCM30 link timeslot 15 data will be sourced from DSTi timeslot 15. And, the receive PCM30 link timeslot 15 data will be sourced to DSTo timeslot 15 only. CCS (CSIG=1 of register address Y03) must be selected for these operations to be valid. Table 148 - HDLC & CCS ST-BUS Control Register (R/W Address Y06) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. 31C4 31C3 31C2 31C1 31C0 (11111) Timeslot 31 CST Map Bits. The selection of these bits results in a mapping of the transmit PCM30 timeslot 31, from a specific CSTi timeslot; and similarly, maps receive PCM30 timeslot 31, to a specific CSTo timeslot. PCM30 timeslot 31 data is mapped to/from CST channel n (n=0 to 31), where n is the BCD (Binary Coded Decimal) equivalent of 31C4 to 31C0 with 31C4 being the most significant bit. Bit Settings Selected 31C4 31C3 31C2 31C1 31C0 CST Timeslot 00000 0 00001 1 0 0010 2 etc. 11111 3 1 CCS (CSIG=1 of register address Y03) and CST (TS31E=1 of register address Y06) must be selected for these operations to be valid. 16C4 16C3 16C2 16C1 16C0 (10000) Timeslot 16 CST Map Bits. The selection of these bits results in a mapping of the transmit PCM30 timeslot 16, from a specific CSTi timeslot; and similarly, maps receive PCM30 timeslot 16, to a specific CSTo timeslot. PCM30 timeslot 16 data is mapped to/from CST channel n (n=0 to 31), where n is the BCD equivalent of 16C4 to 16C0 with 16C4 being the most significant bit. Bit Settings Selected 16C4 16C3 16C2 16C1 16C0 CST Timeslot 00000 0 00001 1 0 0010 2 etc. 11111 3 1 CCS (CSIG=1 of register address Y03) and CST (TS16E=1 of register address Y06) must be selected for these operations to be valid. 15C4 15C3 15C2 15C1 15C0 (01111) Timeslot 15 CST Map Bits. The selection of these bits results in a mapping of the transmit PCM30 timeslot 15, from a specific CSTi timeslot; and similarly, maps receive PCM30 timeslot 15, to a specific CSTo timeslot. PCM30 timeslot 15 data is mapped to/from CST channel n (n=0 to 31), where n is the BCD equivalent of 15C4 to 15C0 with 15C4 being the most significant bit. Bit Settings Selected 15C4 15C3 15C2 15C1 15C0 CST Timeslot 00000 0 00001 1 0 0010 2 etc. 11111 3 1 CCS (CSIG=1 of register address Y03) and CST (TS15E=1 of register address Y06) must be selected for these operations to be valid. Table 149 - CCS to ST-BUS CSTi and CSTo Map Control Register (R/W Address Y07) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. Sa4SS (00) Sa4 Source Select. These 2 bits determine the source of the transmit Sa4 bits in timeslot 0 of NFAS frames. Select Bits: Sa4 Source

00 Transmit National Data Register (YB0)

01 TxDL pin (received Sa4 bits are sent to the RxDL pin)

10 DSTi pin (ST-BUS Channel 0, Bit 4 in NFAS frames)

11 HDLC (Transmit and Receive Sa4 bits)

Note the received Sa4 bits are always available in the RX National Data Bit Buffer (YC0) and timeslot 0 on the DSTo pin. Sa5SS (00) Sa5 Source Select. These 2 bits determine the source of the transmit Sa5 bits in timeslot 0 of NFAS frames. Select Bits: Sa5 Source

00 Transmit National Data Register (YB1)

01 TxDL pin (received Sa5 bits are sent to the RxDL pin)

10 DSTi pin (ST-BUS Channel 0, Bit 3 in NFAS frames)

11 HDLC (Transmit and Receive Sa5 bits)

Note the received Sa5 bits are always available in the RX National Data Bit Buffer (YC1) and timeslot 0 on the DSTo pin. Sa6SS (00) Sa6 Source Select. These 2 bits determine the source of the transmit Sa6 bits in timeslot 0 of NFAS frames. Select Bits: Sa6 Source

00 Transmit National Data Register (YB2)

01 TxDL pin (received Sa6 bits are sent to the RxDL pin)

10 DSTi pin (ST-BUS Channel 0, bit 2 in NFAS frames)

11 HDLC (Transmit and Receive Sa6 bits)

Note the received Sa6 bits are always available in the RX National Data Bit Buffer (YC2) and timeslot 0 on the DSTo pin. Sa7SS (00) Sa7 Source Select. These 2 bits determine the source of the transmit Sa7 bits in timeslot 0 of NFAS frames. Select Bits: Sa7 Source

00 Transmit National Data Register (YB3)

01 TxDL pin (received Sa7 bits are sent to the RxDL pin)

10 DSTi pin (ST-BUS Channel 0, Bit 1 in NFAS frames)

11 HDLC (Transmit and Receive Sa7 bits)

Note the received Sa7 bits are always available in the RX National Data Bit Buffer (YC3) and timeslot 0 on the DSTo pin. Sa8SS (00) Sa8 Source Select. These 2 bits determine the source of the transmit Sa8 bits in timeslot 0 of NFAS frames. Select Bits: Sa8 Source

00 Transmit National Data Register (YB4)

01 TxDL pin (received Sa8 bits are sent to the RxDL pin)

11 HDLC (Transmit and Receive Sa8 bits)

Note the received Sa8 bits are always available to the RX National Data Bit Buffer (YC4) and timeslot 0 on the DSto pin. 4-2 # not used. Table 150 - DataLink Control Register (R/W Address Y08) (E1)

Zarlink Semiconductor Inc.

17.2.4 Master Status Registers (Y10 - Y1A) Bit Functions

Tables 158 to 172 describe the bit functions of each of the Master Status Regist ers in the MT9072 in E1 mode. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most si gnificant address bits (MSB) A11-A8). 1E 4 C K (0) Extracted 4 Data Link Clock. If one, the RxDLC pin outputs an ST-BUS type 4.096 MHz clock signal derived from a doubled 2.048 MHz clock signal at the EXCLi pin. This clock is synchronous with the receive data before it passes through the elastic buffer at the RxDL pin, or at the DSTo pin if control bit ELAS (register address Y03) is disabled. If zero, the RxDLC pin operates as a receive data link clock or enable signal as programmed by control bit DLCK (register address Y08). 0D L C K (0) Data Link Clock. If one, the TxDLC and RxDLC pins output a gapped clock. If zero, the TxDLC and RxDLC pins output an active low enable signal. The above only applies for the national bits enabled for DL pin operation (by the Sa4-8 bits of register address Y03). See Figures 30 to 34. Bit Name Functional Description 15-8 # not used. 7-0 RXIDC 7-0 (0) Receive Idle Code. This is the idle code that is sent on the DSTochannels if the per timeslot control bit MPDR is set(Y90-YAF). Note that bit 7 is sent out first. Table 151 - Receive Idle Code Register(Y09) (E1) Bit Name Functional Description 15-8 # not used. 7-0 TXIDC 7-0 (0) Transmit Idle Code. This is the idle code that is sent on the PCM30 channels if the per timeslot control bit MPDT is set(Y90-YAF) Table 152 - Transmit Idle Code Register(Y0A) (E1) Bit Name Functional Description Table 150 - DataLink Control Register (R/W Address Y08) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. 14 RSLP Receive Slip. This bit changes state when a receive controlled frame slip has occurred. 13 RSLPD Receive Slip Direction. If one, indicates that the last received frame slip (RSLP toggled of register Y10) resulted in a repeated frame. This would occur if the system clock (CKi/2) was faster than the network clock (EXCLi). If zero, indicates that the last received frame slip (RSLP) resulted in a lost frame. This would occur if the system clock (CKi/2) was slower than the network clock (EXCLi). Updated on an RSLP occurrence basis. 12 BSYNC Receive Basic Frame Alignment. If zero, indicates the received PCM30 link basic frame alignment pattern (x0011011 in timeslot 0 of alternate frames) is acquired; if one, the basic frame alignment pattern is lost or not acquired. 11 MSYNC Receive Multiframe Alignment. If zero, indicates the received PCM30 link signaling multiframe alignment signal (0000xxxx in timeslot 16 of every16th frame) is acquired; if one, the signaling multiframe alignment signal is lost or not acquired. 10 CSYNC Receive CRC-4 Synchronization. If zero, indicates the received PCM30 link CRC-4 multiframe alignment pattern (001011xx in timeslot 0, in bit position 1 of 16 alternate frames) is acquired; if one, the CRC-4 multiframe alignment pattern is lost or not acquired. 9R E D RED Alarm. If one, indicates that basic frame alignment (BSYNC of register address Y10) has been lost for at least 100 msec. This bit is cleared (zero) when basic frame alignment is acquired. 8C E F S Consecutively Errored Frame Alignment Signal. If one, the last two frame alignment signals (FAS=0011011) were received in error. If zero, at least one of the last two frame alignment signals were received without error. A non-errored FAS would result in the RFA status bits (register address Y13) set as follows, RFA2=0, RFA3=0, RFA4=1, RFA5=1, RFA6=0, RFA7=1, RFA8=1 7 # not used. 6 RCRC0 Remote CRC-4 and RAI T10. If one, the received A bits were one and the received E bits were zero (RCRCR register address Y10) continuously for more than 10 ms. See I.431 section 3.4.1.2 on RAI and continuous CRC error information. 5 RCRC1 Remote CRC-4 and RAI T450. If one, the received A bits were one and the received E bits were zero (RCRCR register address Y10) continuously for more than 10 ms but less than 4R F A I L Remote CRC-4 Multiframe Generator/Detector Failure. If one, each of the previous five seconds have an E-bit (E1 + E2) of error count of greater than 989 (E-bit counter 3DD hex or 11 1101 1101 address Y17), and for this same period the receive RAI bit (register addressY12 and Y13) was zero (no remote alarm), and for the same period the BSYNC bit (register address Y10) was equal to zero (basic frame alignment has been maintained). If zero, indicates normal operation. 3R E B 1 Receive E1 Bit Status. Indicates the status of the bit (E1) received on the PCM30 link in bit position 1 of timeslot 0 in non-frame alignment signal (NFAS) frame 13. If zero, the remote end calculated a CRC-4 error in its received sub-multiframe one. If one, no error was calculated. Table 153 - Synchronization & CRC-4 Remote Status (R Address Y10) (E1)

Zarlink Semiconductor Inc. 2R E B 2 Receive E2 Bit Status. Indicates the status of the bit (E2) received on the PCM30 link in bit position 1 of timeslot 0 in non-frame alignment signal (NFAS) frame 15. If zero, the remote end calculated a CRC-4 error in its received sub-multiframe two. If one, no error was calculated. 1 RCRCR Remote CRC-4 and RAI. If one, the RAI (A) status bit (register address Y12 and Y13) is one, and the REB1 (E1) and REB2 (E2) status bits (register address Y10) are zero. If zero, the above requirement is not met. 0 CRCIW CRC-4 Interworking. If one, indicates the CRC-4 interworking status is CRC-4 to CRC-4 (local to remote). The transmit PCM30 link is framed to CRC-4 with E1 and E2 bits sent, and the receive PCM30 link is treated as CRC-4 with E1 and E2 bits received. If zero, indicates the CRC-4 interworking status is CRC-4 to non-CRC (local to remote). In this case, the transmit PCM30 link is framed to CRC-4 but the E1 and E2 bits are not sent, and the receive PCM30 link is not treated as a CRC-4 multiframe but only as a basic frame and signaling multiframe frame only. Bit Name Functional Description Table 153 - Synchronization & CRC-4 Remote Status (R Address Y10) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-13 ## not used. 13 ONESEC One Second Timer Status. This bit toggles from low to high once every one second, and is synchronous with the applied125 us frame pulse at pin FPi. 12 TWOSEC Two Second Timer Status. This bit toggles from low to high once every two seconds, and is synchronous with the applied125 us frame pulse at pin FPi. 11 T1 Timer 1. If one, indicates that a receive PCM30 link with non-normal operational CRC-4 frames (CSYNC=1 of register address Y10) has persisted for at least 100 ms. This bit is zero 10 T2 Timer 2. If one, indicates that a receive PCM30 link with normal operational CRC-4 frames (CSYNC=0 of register address Y11) has persisted for at least 10 ms. This bit is cleared (zero) 9 T400 400 ms Timer Status. This is the 400 ms CRC-4 multiframe alignment timer. This bit initially changes state from zero to one synchronously with the T8 (register address Y11) bit after the T8 bit has consecutively toggled 50 times (400 ms). While this condition persists (T8=0101 etc.), the T400 bit continues to change state every 400 ms. The T400 bit is cleared (zero) with the T8 bit when CRC-4 multiframe synchronization is acquired (CSYNC =0). 8T 8 8 ms Timer Status. This is the 8 ms CRC-4 multiframe alignment timer. This bit initially changes state from zero to one synchronously with the CRCRF (register address Y11) bit when the received PCM30 link CRC-4 multiframe synchronization (CSYNC of register address Y10) could not be found within the time out period of 8 ms after detecting basic frame synchronization (BSYNC=0 of register address Y10). While this condition persists (CRCRF=1), the T8 bit continues to change state every 8 ms. The T8 bit is cleared (zero) with the CRCRF bit when CRC-4 multiframe synchronization is acquired (CSYNC =0). 7-5 ### not used. 4C A L N CRC-4 Alignment 2ms Timer. When CRC-4 multiframe alignment has not been achieved (CSYNC=1 of register address Y10), this bit asynchronously changes state every 2 ms. When CRC-4 multiframe alignment has been achieved (CSYNC =0), this bit still changes state every 2 ms, but is synchronous with the receive CRC-4 multiframe signal. 3 CRCRF CRC-4 Reframe. If one, indicates the received PCM30 link CRC-4 multiframe synchronization (CSYNC of register address Y10) could not be found within the time out period of 8 ms after detecting basic frame synchronization (BSYNC of register address Y10). This bit is cleared (zero) when CRC-4 multiframe synchronization is acquired (CSYNC =0). 2 CRCS1 Receive CRC-4 Error Status One. If one, the CRC-4 evaluation of the last received PCM30 link submultiframe 1 resulted in an error (the calculated C1,C2,C3,C4 CRC-4 remainder bits did not match the received CRC-4 remainder C1,C2,C3,C4 bits). If zero, the last submultiframe 1 was error free. Updated on a submultiframe 1 basis. 1 CRCS2 Receive CRC-4 Error Status Two. If one, the CRC-4 evaluation of the last received PCM30 link submultiframe 2 resulted in an error (the calculated C1,C2,C3,C4 CRC-4 remainder bits did not match the received CRC-4 remainder C1,C2,C3,C4 bits). If zero, the last submultiframe 2 was error free. Updated on a submultiframe 2 basis. 0 (#) not used. Table 154 - CRC-4 Timers & CRC-4 Local Status (R Address Y11) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-14 ## not used. 13 KLVE Keep Alive. If one, indicates that the AIS status bit (register address Y12) has been one for at least 100 ms. This bit is zero when AIS is zero. Refer to I.431. 12 LOSS Loss of Signal Status Indication. If one, indicates the presence of a loss of signal condition on the received PCM30 link. A loss of signal condition occurs when 192 or 32 (selectable by L32Z in Y01) consecutive bit periods are zero. A loss of signal condition terminates when an average ones density of at least 12.5% has been received over a period of 255 contiguous pulse positions starting with a pulse. If zero, indicates normal operation. 11 AIS16 Alarm Indication Signal 16 Status. If one, indicates an all ones signal (1111 1111) is being received in timeslot16 of the received PCM30 link for the current frame. Updated on a basic frame basis. If zero, normal operation. 10 AIS Alarm Indication Status Signal. If one, indicates that an Alarm Indication Signal (AIS) is detected on the received PCM30 link. The criteria (i.e., less than three zeros in a two frame period) for AIS detection is determined by the control bit ASEL (register address Y00). If the AIS bit is zero, indicates that an AIS signal not being received. 9R A I Remote Alarm Indication Status. Indicates the status of the bit (A-bit) received on the PCM30 link in bit position 3 of timeslot 0 of the non-frame alignment signal (NFAS) frames. If one, there is currently a remote alarm condition. Updated on a NFAS frame basis. This bit is identical to the RAI bit of register address Y13 and is duplicated here for convenience. 8A U X P Auxiliary Pattern. If one, an auxiliary pattern (101010) of at least 512 bits is being received on the PCM30 link. If zero, an auxiliary pattern is not being received. This pattern will be decoded in the presents of a bit error rate of as much as 10 -3. RMA1 RMA2 RMA3 RMA4 Receive Multiframe Alignment Bits One to Four. Indicates the status of the bits received on the PCM30 link in bit positions one to four of timeslot 16 of frame 0 of the multiframe alignment signal (MAS). These bits should be 0000 for proper signaling multiframe alignment. Updated on a MAS frame basis. 3X 1 Receive Spare Bit X1. Indicates the status of the bit received on the PCM30 link in bit position five of timeslot 16 of frame 0 of the multiframe alignment signal (MAS). Updated on a MAS frame basis. 2Y Receive Y-bit. Indicates the status of the bit (Y-bit) received on the PCM30 link in bit position six of timeslot 16 of frame 0 of the multiframe alignment signal (MAS). Updated on a MAS frame basis. If one, typically indicates a loss of multiframe alignment at the remote end. If zero, typically indicates acquired multiframe alignment at the remote end. Receive Spare Bits X2 and X3. Indicates the status of the bits received on the PCM30 link in bit positions seven and eight of timeslot 16 of frame 0 of the multiframe alignment signal (MAS). Updated on a MAS frame basis. Table 155 - Alarms & Multiframe Signaling (MAS) Status (R Address Y12) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 RIU1 Receive International Use 1. Indicates the status of the bit received on the PCM30 link in bit position one of timeslot 0 of the non-frame alignment signal (NFAS) frames. This bit is the CRC-4 multiframe alignment bit (001011) of the NFAS frames (1,3,5,7,9,11) when CRC-4 multiframing is used. Or, this bit is used for international use. 14 RNFA Receive Non-Frame Alignment Bit. Indicates the status of the bit received on the PCM30 link in bit position two of timeslot 0 of the non-frame alignment signal (NFAS) frames. This bit should be one and identifies the frame as an NFAS frame (the FAS frame should have a zero in bit position two of timeslot 0). 13 RAI Remote Alarm Indication Status. Indicates the status of the bit (A-bit) received on the PCM30 link in bit position 3 of timeslot 0 of the non-frame alignment signal (NFAS) frames. If one, there is currently a remote alarm condition. Updated on a NFAS frame basis. This bit is identical to the RAI bit of register address Y12 and is duplicated here for convenience. RNU4 RNU5 RNU6 RNU7 RNU8 Receive National Use Four to Eight. Indicates the value of the Sa bits received on the PCM30 link in bit positions four to eight of timeslot 0 of the non-frame alignment signal (NFAS) frames. Sa4 corresponds to RNU4, Sa5 to RNU5 and so on up to Sa8 to RNU8. Updated on a NFAS frame basis. 7R I U 0 Receive International Use Zero. Indicates the status of the bit received on the PCM30 link in bit position one of timeslot 0 of the frame alignment signal (FAS) frames. This bit is the CRC-4 remainder bit (C1,C2,C3 or C4) of the FAS frames when CRC-4 multiframing is used. Or, this bit is used for international use. RFA2 RFA3 RFA4 RFA5 RFA6 RFA7 RFA8 Receive Frame Alignment Signal (FAS) Bits 2 to 8. Indicates the value of the bits received on the PCM30 link in bit positions two to eight of timeslot 0 of the frame alignment signal (FAS) frames. These bits form the FAS and should have the value of 0011011. Table 156 - Non-Frame Alignment (NFAS) Si gnal and Frame Alignment Signal (FAS) Status (R Address Y13) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-12 #### not used. Phase Indicator. These 12 bits are an indication of the delay through the receive slip buffer and the imminence of a receive frame slip. The read address is this register’s value plus 16 bits and is updated when the write address is zero. The slip buffer contains 512 bits on 64 channels (0 thru 63). The accuracy of this indicator is approximately 1/16 of a bit. PI11 PI10 PI9 PI8 PI7 PI6 PI5 PI4 PI3 PI2 PI1 PI0 This bit indicates a 1 frame (32 timeslot or 256 bit) phase offset. This bit indicates a 16 timeslot (128 bit) phase offset. This bit indicates a 4 timeslot (64 bit) phase offset. This bit indicates a 3 timeslot (32 bit) phase offset. This bit indicates a 2 timeslot (16 bit) phase offset. This bit indicates a 1 timeslot (8 bit) phase offset. This bit indicates a 4 bit phase offset. This bit indicates a 2 bit phase offset. This bit indicates a 1 bit phase offset. This bit indicates a 1/2 bit phase offset. This bit indicates a 1/4 bit phase offset. This bit indicates a 1/8 bit phase offset. Table 157 - Phase Indicator Status (R Address Y14) (E1) Bit Name Functional Description PEC7 PEC6 PEC5 PEC4 PEC3 PEC2 PEC1 PEC0 Pseudo Random Bit Sequence (PRBS) Error Counter. These bits make up a counter which is incremented for each pseudo random bit sequence (PRBS) (2 15-1) error detected on any of the DSTo receive channels connected (ADSEQ=0 register address Y01, RRSTn=1 register address Y90 to YAF) to the PRBS error detector. This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or may be set by writing the desired value to it. PEC0 is the least significant bit (LSB). The lower byte and upper byte of register cannot be written to independently. PCC7 PCC6 PCC5 PCC4 PCC3 PCC2 PCC1 PCC0 Pseudo Random Bit Sequence (PRBS) CRC-4 Counter. These bits make up a counter which is incremented for each received CRC-4 multiframe. This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or may be set by writing the desired value to it. PCC0 is the least significant bit (LSB). The lower byte and upper byte of register cannot be written to independently. Table 158 - PRBS Error Counter & PRBS CRC-4 Counter (R/W Address Y15) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description SLC15 SLC14 SLC13 SLC12 SLC11 SLC10 SLC9 SLC8 SLC7 SLC6 SLC5 SLC4 SLC3 SLC2 SLC1 SLC0 Loss of Basic Frame Synchronization Counter. These bits make up a counter which is incremented for each 125 us period in which basic frame synchronization (BSYNC status register address Y10) is lost. This counter is cleared by a basic frame synchronization to a loss of basic frame synchronization state transition (BSYNC=0 to 1), or with an overflow, a RESET (RESET pin or RST bit), or it may be set by writing the desired value to it. SLC0 is the least significant bit (LSB). Table 159 - Loss of Basic Frame Synchronization C ounter with Auto Clear (R/W Address Y16) (E1) Bit Name Functional Description EEC15 EEC14 EEC13 EEC12 EEC11 EEC10 EEC9 EEC8 EEC7 EEC6 EEC5 EEC4 EEC3 EEC2 EEC1 EEC0 E-bit Error Counter. These bits make up a counter which is incremented for each received PCM30 CRC-4 submultiframe E-bit error. This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or may be set by writing the desired value to it. EEC0 is the least significant bit (LSB). Table 160 - E-bit Error Counter (R/W Address Y17) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description VEC15 VEC14 VEC13 VEC12 VEC11 VEC10 VEC9 VEC8 VEC7 VEC6 VEC5 VEC4 VEC3 VEC2 VEC1 VEC0 Bipolar Violation Error Counter. These bits make up a counter which is incremented for each received bipolar violation error. This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or may be set by writing the desired value to it. VEC0 is the least significant bit (LSB). Table 161 - Bipolar Violation (BPV) Error Counter (R/W Address Y18) (E1) Bit Name Functional Description CEC15 CEC14 CEC13 CEC12 CEC11 CEC10 CEC9 CEC8 CEC7 CEC6 CEC5 CEC4 CEC3 CEC CEC1 CEC0 CRC-4 Error Counter. These bits make up a counter which is incremented for each calculated CRC-4 submultiframe error (see CRCS1 and CRCS2 bits of register address Y11). This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or may be set by writing the desired value to it. CEC0 is the least significant bit (LSB). Table 162 - CRC-4 Error Counter (R/W Address Y19) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description BEC7 BEC6 BEC5 BEC4 BEC3 BEC2 BEC1 BEC0 Frame Alignment Signal (FAS) Bit Error Counter. These bits make up a counter which is incremented for each individual error in the received PCM30 link basic frame alignment signal (FAS) pattern (x0011011 in timeslot 0 of alternate frames). This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or it may be set by writing the desired value to it. BEC0 is the least significant bit (LSB). The lower byte and upper byte of register cannot be written to independently. FEC7 FEC6 FEC5 FEC4 FEC3 FEC2 FEC1 FEC0 Frame Alignment Signal (FAS) Error Counter. These bits make up a counter which is incremented for each combined (one or more) error in the received PCM30 link basic frame alignment signal (FAS) pattern (x0011011 in timeslot 0 of alternate frames). This counter is cleared with an overflow, a RESET (RESET pin or RST bit), or it may be set by writing the desired value to it. FEC0 is the least significant bit (LSB). The lower byte and upper byte of register cannot be written to independently. Table 163 - Frame Alignment Signal (FAS) Bit Error Counter & FAS Error Counter (R/W Address Y1A) (E1) Bit Name Functional Description 15-12 #### not used.

11 RXclk This bit represents the receiver clock generated after the RXEN control bit, but before

zero deletion is considered.

10 TXclk This bit represents the transmit clock generated after the TXEN control bit, but before

zero insertion is considered. 9 Vcrc This is the CRC recognition status bit for the receiver. Data is clocked into the register and then this bit is monitored to see if comparison was successful (bit will be high). 8 Vaddr This is the address recognition status bit for the receiver. Data is clocked into the Address Recognition Register and then this bit is monitored to see if comparison was successful (bit will be high). 7 - 0 TBP7-0 Transmit Byte Counter Position. These 7 bits provide the position of the Transmit HDLC Byte Counter register (YF6). The counter is decremented as a byte of data is sent through the Transmit FIFO. When this register reaches the count of one, the next write to the Tx FIFO will be tagged as an end of packet byte. The counter decrements at the end of the write to the Tx FIFO. If the Cycle bit of YF2 is set high, the counter will cycle through the programmed value continuously. Table 164 - Transmit Byte Counter Position and HDLC Test Status(Y1C) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 6I D C Idle Channel State. Is set to a 1 when an idle Channel state (15 or more ones) has been detected at the receiver. This is an asynchronous event. On power reset, this may be 1 if the clock (RXC) was not operating. Status becomes valid after the first 15 bits or the first zero is received. 5-4 RQ9-8 RQ9-8 Byte Status bits from RX FIFO. These bits determine the status of the byte to be read from RX FIFO as follows: 3-2 TXSTAT1-0 Transmit FIFO Status: 00 Transmit FIFO is full.

01 The number of bytes in the transmit FIFO has reached or exceeded 16 bytes

11 The number of bytes in the TX FIFO is less than the 16 byte threshold. 1-0 RXSTAT1-0 Receive FIFO Status: 00 Receive FIFO is full.

01 The number of bytes in the Receive FIFO has reached or exceeded 16 bytes

10 Receive FIFO is empty

11 The number of bytes in the Receive FIFO is less than the 16 byte threshold. Table 165 - HDLC Status Register(Y1D) (E1) Bit Name Functional Description 15-0 RCRC15-0 Received CRC. The CRC received from the transmitter. The LSB of the FCS sequence is MSB in this register. This register is updated at the end of each received packet and therefore should be read when end of packet is detected. Table 166 - HDLC Receive CRC(Y1E) (E1) Bit Name Functional Description 7 - 0 RXFIFO7-0 Receive FIFO.This is the received data byte read from the RX FIFO. The status bits of this byte can be read from the status register. The FIFO status is not changed immediately when a write or read occurs. It is updated after the data has settled and the transfer to the last available position has finished. Table 167 - HDLC Receive FIFO(Y1F) (E1)

Zarlink Semiconductor Inc.

17.2.5 Latched Status Registers (Y2X) Bit Functions

Tables 173 to 181 describe the bit functions of each of the Latched Status Registers in the MT9072 in E1 mode. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most si gnificant address bits (MSB) A11-A8). All latched status registers will be reset in the inactive state upon reset. Bit Name Functional Description 8G A L Go Ahead received Latch.Indicates a go-ahead pattern (01111111) was detected by the HDLC receiver. This bit is reset after a read. 7E O P D L End of Packet Data Latch.This bit is set when an end of packet (EOP) byte was written into the RX FIFO by the HDLC receiver. This can be in the form of a flag, an abort sequence or as an invalid packet. This bit is reset after a read. 6 TEOPL Transmit End of Packet Latch.This bit is set when the transmitter has finished sending the closing flag of a packet or after a packet has been aborted. This bit is reset after read. 5E O P R L End of Packet received latch.This bit is set when the byte about to be read from the RX FIFO is the last byte of the packet. It is also set if the Rx FIFO is read and there is no data in it. This bit is reset after a read. 4T X F L Transmit Fifo Low Latch.This bit is set when the Tx FIFO is emptied below the selected low threshold level. This bit is reset after a read. 3F A L Framer Abort Latch. This bit (FA) is set when a frame abort is received during packet reception. It must be received after a minimum number of bits have been received (26) otherwise it is ignored. 2 TXunder Txunder Latch.This bit is set for a TX FIFO underrun indication. If high it Indicates that a read by the transmitter was attempted on an empty Tx FIFO. This bit is reset after a read. 1R x f f L Receive Fifo Full Latch.This bit is set when the Rx FIFO is filled above the selected full threshold level. This bit is reset after a read. 0R x O v f L Receive Overflow Latch.Indicates that the 32 byte RX FIFO overflowed (i.e., an attempt to write to a 32 byte full RX FIFO). The HDLC will always disable the receiver once the receive overflow has been detected. The receiver will be re-enabled upon detection of the next flag, but will overflow again unless the RX FIFO is read. This bit is reset after a read. Table 168 - HDLC Status Latch(Y23) (E1) Bit Name Functional Description 15 # not used. 14 RCRCRL Remote CRC-4 and RAI Latch. When the RCRCR status bit (register address Y10) toggles from zero to one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 13 RSLPL Receive Slip Latch. When the RSLP status bit (register address Y13) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. Table 169 - Sync, CRC-4 Remote, Alarms, MAS and Phase Latched Status Register (Address Y24) (E1)

Zarlink Semiconductor Inc. 12 YL Receive Y-bit Latch. When the Y status bit (register address Y12) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 11 AUXPL Auxiliary Pattern Latch. When the AUXP status bit (register address Y12) toggles from zero to one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 10 RAIL Remote Alarm Indication Status Latch. When the RAI (A) status bit (register address Y12 and Y13) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 9A I S L Alarm Indication Status Signal Latch. When the AIS status bit (register address Y12) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 8A I S 1 6 L Alarm Indication Signal 16 Status Latch. When the AIS16 status bit (register address Y12) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 7 LOSSL Loss of Signal Status Indication Latch. When the LOSS status bit (register address Y12) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 6 RCRC0L Remote CRC-4 and RAI T10 Latch. When the RCRC0 status bit (register address Y10) toggles from zero to one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 5 RCRC1L Remote CRC-4 and RAI T450 Latch. When the RCRC1 status bit (register address Y10) toggles from zero to one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 4C E F S L Consecutively Errored Frame Alignment Signal Latch. When the CEFS status bit (register address Y10) toggles from zero to one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 3R F A I L L Remote CRC-4 Multiframe Generator/Detector Failure Latch. When the status bit (register address Y10) toggles from zero to one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 2 CSYNCL Receive CRC-4 Synchronization Latch. When the CSYNC status bit (register address Y10) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 1 MSYNCL Receive Multiframe Alignment Latch. When the MSYNC status bit (register address Y10) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. 0 BSYNCL Receive Basic Frame Alignment Latch. When the BSYNC status bit (register address Y10) toggles from zero to one, or from one to zero, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y34) is read. Bit Name Functional Description Table 169 - Sync, CRC-4 Remote, Alarms, MAS and Phase Latched Status Register (Address Y24) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. 14 SLOL Loss of Sync Counter Overflow Latch. When the Loss of Sync Counter (SLC15-0 register address Y16) overflows (3FF to 00), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 13 FEOL Frame Alignment Signal (FAS) Error Counter Overflow Latch. When the FAS Error Counter (FEC7-0 register address Y1A lower byte) overflows (FF to 00), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 12 FEIL Frame Alignment Signal (FAS) Error Counter Indication Latch. When the FAS Error Counter (FEC7-0 register address Y1A lower byte) is incremented by one, this status bit is latched to one. This bit is cleared when either this register or the interrupt status register (register address Y35) is read. 11 BEOL Frame Alignment Signal (FAS) Bit Error Counter Overflow Latch. When the FAS Bit Error Counter (BEC7-0 register address Y1A upper byte) overflows (FF to 00), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 10 BEIL Frame Alignment Signal (FAS) Bit Error Counter Indication Latch. When the FAS Bit Error Counter (BEC7-0 register address Y1A upper byte) is incremented by one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 9C E O L CRC-4 Error Counter Overflow Latch. When the CRC-4 Error Counter (CEC15-0 register address Y19) overflows (3FF to 000), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 8C E I L CRC-4 Error Counter Indication Latch. When the CRC-4 Error Counter (CEC15-0 register address Y19) is incremented by one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 7V E O L Bipolar Violation (BPV) Error Counter Overflow Latch. When the BPV Error Counter (VEC15-0 register address Y18) overflows (FFFF to 000), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 6 VEIL Bipolar Violation (BPV) Error Counter Indication Latch. When the BPV Error Counter (VEC15-0 register address Y18) is incremented by one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 5E E O L E-Bit Error Counter Overflow Latch. When the E-Bit Error Counter (EEC15-0 register address Y17) overflows (3FF to 000), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 4 EEIL E-Bit Error Counter Indication Latch. When the E-Bit Error Counter (EEC15-0 register address Y17) is incremented by one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 3P C O L PRBS CRC-4 Counter Overflow Latch. When the PRBS CRC-4 Counter (PCC7-0 register address Y15 lower byte) overflows (FF to 00), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 2 # not used. Table 170 - Counter Indication and Counter Overflow Latched Status Register (Address Y25) (E1)

Zarlink Semiconductor Inc. 1P E O L PRBS Error Counter Overflow Latch. When the PRBS Error Counter (PEC7-PEC0 register address Y15 upper byte) overflows (FF to 00), this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. 0 PEIL PRBS Error Counter Indication Latch. When the PRBS Error Counter (PEC7-PEC0 register address Y15 upper byte) is incremented by one, this status bit is latched to one. This bit is cleared when either this register, or the interrupt status register (register address Y35) is read. Bit Name Functional Description 15 # not used. 14 Sa5VL Sa5 Bit Value Latch. This is the latched value of the Sa5 National bit when the Sa6N8L bit toggles to one. The Sa5VL bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. Sa6V3L Sa6V2L Sa6V1L Sa6V0L Sa6 Nibble (bit 3 to 0) Value Latch. This is the latched value of the Sa6 National bits nibble (bits 3 to 0) when the Sa6N8L bit toggles to one. These bits are cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 9S a 6 N 8 L Sa6 Nibble Eight Consecutive Times Status Latch. When eight consecutive identical receive Sa6 National bit nibble patterns are received (per sub-multiframe), this status bit is latched to one. This bit is set on a CRC-4 sub-multiframe basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 8 Sa6NL Sa6 Nibble Change Status Latch. When a received Sa6 National bit nibble (per sub-multiframe) changes value, this status bit is latched to one. This bit is set on a CRC-4 sub-multiframe basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 7S a N L Sa Nibble Change Status Latch. When any receive National (i.e. Sa5,Sa6,Sa7 or Sa8) bits nibbles changes value, this status bit is latched to one. This bit is set on a CRC-4 sub-multiframe basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 6 Sa5TL Sa5 Bit Change Status Latch. When a received Sa5 National bit changes value, this status bit is latched to one. This bit is set on a CRC-4 NFAS frame basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 5S a T L Sa Bit Change Status Latch. When any receive National (i.e., Sa5,Sa6,Sa7 or Sa8) bit changes value, this status bit is latched to one. This bit is set on a CRC-4 NFAS frame basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. Table 171 - CAS, National, CRC-4 Local and Timer Latched Status Register (Address Y26) (E1) Bit Name Functional Description Table 170 - Counter Indication and Counter Overflow Latched Status Register (Address Y25) (E1)

Zarlink Semiconductor Inc. 4 CASRL Receive Channel Associated Signaling (CAS) Change Latch. When any of the receive CAS (i.e., ABCD) bits in the Receive CAS Data Registers (address Y70-Y8F) change state, this status bit is latched to one. This bit is set on a basic frame (FPi) basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y34) is read. 3C A L N L CRC-4 Alignment 2 ms Timer Latch. When the CALN status bit (register address Y11) toggles from zero to one, this status bit is latched to one. This bit is set on a 2 ms or CRC-4 multiframe frame basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 2T 2 L Timer 2 Latch. When the CRC-4 T2 (10ms) status bit (register address Y11) toggles from zero to one, this status bit is latched to one. This bit is set on a basic frame (FPi) basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 1T 1 L Timer 1 Latch. When the CRC-4 T1 (100ms) status bit (register address Y11) toggles from zero to one, this status bit is latched to one. This bit is set on a basic frame (FPi) basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. 0 ONESECL One Second Timer Status Latch. When the ONESEC status bit (register address Y11) toggles from zero to one, this status bit is latched to one. This bit is set on a basic frame (FPi) basis. This bit is cleared when either this register, or the corresponding interrupt status register (register address Y36) is read. Bit Name Functional Description 15-4 # not used. 3R A I P Remote Alarm Indication Status Persistent Latch. When the RAI (A) status bit (register address Y12 and Y13) toggles from zero to one, this status bit is latched to one. This bit is cleared when this register is read while the RAI status bit is zero. 2A I S P Alarm Indication Status Signal Persistent. When the AIS status bit (register address Y12) toggles from zero to one, this status bit is latched to one. This bit is cleared when this register is read while the AIS status bit is zero. 1 LOSSP Loss of Signal Status Indication Persistent Latch. When the LOSS status bit (register address Y12) toggles from zero to one, this status bit is latched to one. This bit is cleared when this register is read while the LOSS status bit is zero. 0 BSYNCP Receive Basic Frame Alignment Persistent Latch. When the BSYNC status bit (register address Y10) toggles from zero to one, this status bit is latched to one. This bit is cleared when this register is read while the BSYNC status bit is zero. Table 172 - Performance Persistent Latched Status Register (Address Y27) (E1) Bit Name Functional Description Table 171 - CAS, National, CRC-4 Local and Timer Latched Status Register (Address Y26) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description EEL15 EEL14 EEL13 EEL12 EEL11 EEL10 EEL9 EEL8 EEL7 EEL6 EEL5 EEL4 EEL3 EEL2 EEL1 EEL0 E-bit Error Count Latch. These bits make up a latch which samples the current value of the E-Bit Error Counter (address Y17) on the rising edge of the internal one second timer (ONESEC register address Y11). This latch is cleared with a RESET (RESET pin or RST bit). EEL0 is the least significant bit (LSB). Table 173 - E-Bit Error Count Latch (R Address Y28) (E1) Bit Name Functional Description VEL15 VEL14 VEL13 VEL12 VEL11 VEL10 VEL9 VEL8 VEL7 VEL6 VEL5 VEL4 VEL3 VEL2 VEL1 VEL0 Bipolar Violation (BPV) Error Count Latch. These bits make up a latch which samples the current value of the Bipolar Violation (BPV) Error Counter (address Y18) on the rising edge of the internal one second timer (ONESEC register address Y11). This latch is cleared with a RESET (RESET pin or RST bit). VEL0 is the least significant bit (LSB). Table 174 - Bipolar Violation (BPV) Error Count Latch (R/W Address Y29) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description CEL15 CEL14 CEL13 CEL12 CEL11 CEL10 CEL9 CEL8 CEL7 CEL6 CEL5 CEL4 CEL3 CEL2 CEL1 CEL0 CRC-4 Error Count Latch. These bits make up a latch which samples the current value of the CRC-4 Error Counter (address Y19) on the rising edge of the internal one second timer (ONESEC register address Y11). This latch is cleared with a RESET (RESET pin or RST bit). CEL0 is the least significant bit (LSB). Table 175 - CRC-4 Error Count Latch (R/W Address Y2A) (E1) Bit Name Functional Description BEL7 BEL6 BEL5 BEL4 BEL3 BEL2 BEL1 BEL0 Frame Alignment Signal (FAS) Bit Error Count Latch. These bits make up a latch which samples the current value of the Frame Alignment Signal (FAS) Bit Error Counter (upper byte of address Y1A) on the rising edge of the internal one second timer (ONESEC register address Y11). This latch is cleared with a RESET (RESET pin or RST bit). BEL0 is the least significant bit (LSB). FEL7 FEL6 FEL5 FEL4 FEL3 FEL2 FEL1 FEL0 Frame Alignment Signal (FAS) Error Count Latch. These bits make up a latch which samples the current value of the Frame Alignment Signal (FAS) Error Counter (lower byte of address Y1A) on the rising edge of the internal one second timer (ONESEC register address Y11). This latch is cleared with a RESET (RESET pin or RST bit). FEL0 is the least significant bit (LSB). Table 176 - Frame Alignment Signal (FAS) Error Count Latch (R/W Address Y2B) (E1)

Zarlink Semiconductor Inc.

17.2.6 Interrupt Vector and Interr upt Status Registers (Y3X) Bit Functions

Tables 129 and 130 describes the bit fu nctions of the Interrupt Vectors, while Tables 182 to 185 describe the bit functions of each of the Interrupt Status Registers in the MT9072. Each interrupt status register is repeated for each of the 8 framers (not the Interrupt Vectors). Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represent s the 4 most significant address bits (MSB) A11-A8). However, since the Interrupt Vectors are common for all eight framers, only addresses 910 and 911 may be used to read from these registers. The (#) indicates that the unused bit position may be read as either a (0) or (1). Bit Name Functional Description 15-9 # not used. 8G A I Go Ahead Interrupt. Indicates a go-ahead pattern (01111111) was detected by the HDLC receiver. This bit is reset after a read. 7E O P D I End of Packet Data Interrupt.This bit is set when an end of packet (EOP) byte was written into the RX FIFO by the HDLC receiver. This can be in the form of a flag, an abort sequence or as an invalid packet. This bit is reset after a read. 6 TEOPI Transmit End of Packet Interrupt.This bit is set when the transmitter has finished sending the closing flag of a packet or after a packet has been aborted. This bit is reset after read. 5E O P R I End of Packet Receive Fifo Interrupt.This bit is set when the byte about to be read from the RX FIFO is the last byte of the packet. It is also set if the Rx FIFO is read and there is no data in it. This bit is reset after a read. 4T X F L I Transmit FIFO Low Interrupt.This bit is set when the Tx FIFO is emptied below the selected low threshold level. This bit is reset after a read. 3F A I Frame Abort: Transmit Interrupt. this bit (FA) is set when a frame abort is received during packet reception. It must be received after a minimum number of bits have been received (26) otherwise it is ignored. 2 TXUNDERI Transmit Elastic Buffer Empty Interrupt. If high it Indicates that a read by the transmitter was attempted on an empty Tx FIFO. This bit is reset after a read. 1 RXFFI Receive FIFO is filled above Threshold Interrupt.This bit is set when the Rx FIFO is filled above the selected full threshold level. This bit is reset after a read. 0 RXOVFLI Receive FiFO Overflow Interrupt. This bit Indicates that the 32 byte RX FIFO overflowed (i.e. an attempt to write to a 32 byte full RX FIFO). The HDLC will always disable the receiver once the receive overflow has been detected. The receiver will be re-enabled upon detection of the next flag, but will overflow again unless the RX FIFO is read. This bit is reset after a read. Table 177 - HDLC Interrupt Status Register(Y33) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. 14 RCRCRI Remote CRC-4 and RAI Interrupt. This bit is one when the corresponding latched status bit (RCRCRL, register address Y24) is set, and the corresponding mask bit is unmasked (RCRCRM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 13 RSLPI Receive Slip Interrupt. This bit is one when the corresponding latched status bit (RSLPL, register address Y24) is set, and the corresponding mask bit is unmasked (RSLPM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 12 YI Receive Y-bit Interrupt. This bit is one when the corresponding latched status bit (YL, register address Y24) is set, and the corresponding mask bit is unmasked (YM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 11 AUXPI Auxiliary Pattern Interrupt. This bit is one when the corresponding latched status bit (AUXPL, register address Y24) is set, and the corresponding mask bit is unmasked (AUXPM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 10 RAII Remote Alarm Indication Status Interrupt. This bit is one when the corresponding latched status bit (RAIL, register address Y24) is set, and the corresponding mask bit is unmasked (RAIM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 9A I S I Alarm Indication Status Signal Interrupt. This bit is one when the corresponding latched status bit (AISL, register address Y24) is set, and the corresponding mask bit is unmasked (AISM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 8A I S 1 6 I Alarm Indication Signal 16 Status Interrupt. This bit is one when the corresponding latched status bit (AIS16L, register address Y24) is set, and the corresponding mask bit is unmasked (AIS16M, register address Y44). This bit is cleared when either this register, or the latched status register is read. 7 LOSSI Loss of Signal Status Indication Interrupt. This bit is one when the corresponding latched status bit (LOSSL, register address Y24) is set, and the corresponding mask bit is unmasked (LOSSM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 6 RCRC0I Remote CRC-4 and RAI T10 Interrupt.This bit is one when the corresponding latched status bit (RCRC0L, register address Y24) is set, and the corresponding mask bit is unmasked (RCRC0M, register address Y44). This bit is cleared when either this register, or the latched status register is read. 5 RCRC1I Remote CRC-4 and RAI T450 Interrupt. This bit is one when the corresponding latched status bit (RCRC1L, register address Y24) is set, and the corresponding mask bit is unmasked (RCRC1M, register address Y44). This bit is cleared when either this register, or the latched status register is read. Table 178 - Sync, CRC-4 Remote, Alarms, MAS and Phase Interrupt Status Register (Address Y34) (E1)

Zarlink Semiconductor Inc. 4 CEFSI Consecutively Errored Frame Alignment Signal Interrupt. This bit is one when the corresponding latched status bit (CEFSL, register address Y24) is set, and the corresponding mask bit is unmasked (CEFSM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 3R F A I L I Remote CRC-4 Multiframe Generator/Detector Failure Interrupt. This bit is one when the corresponding latched status bit (RFAILL, register address Y24) is set, and the corresponding mask bit is unmasked (RFAILM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 2 CSYNCI Receive CRC-4 Synchronization Interrupt. This bit is one when the corresponding latched status bit (CSYNCL, register address Y24) is set, and the corresponding mask bit is unmasked (CSYNCM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 1 MSYNCI Receive Multiframe Alignment Interrupt. This bit is one when the corresponding latched status bit (MSYNCL, register address Y24) is set, and the corresponding mask bit is unmasked (MSYNCM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 0 BSYNCI Receive Basic Frame Alignment Interrupt. This bit is one when the corresponding latched status bit (BSYNCL, register address Y24) is set, and the corresponding mask bit is unmasked (BSYNCM, register address Y44). This bit is cleared when either this register, or the latched status register is read. Bit Name Functional Description 15 # not used. 14 SLOI Loss of Sync Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (SLOL, register address Y25) is set, and the corresponding mask bit is unmasked (SLOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 13 FEOI Frame Alignment Signal (FAS) Error Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (FEOL, register address Y25) is set, and the corresponding mask bit is unmasked (FEOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 12 FEII Frame Alignment Signal (FAS) Error Counter Indication Interrupt. This bit is one when the corresponding latched status bit (FEIL, register address Y25) is set, and the corresponding mask bit is unmasked (FEIM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 11 BEOI Frame Alignment Signal (FAS) Bit Error Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (BEOL, register address Y25) is set, and the corresponding mask bit is unmasked (BEOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. Table 179 - Counter Indication and Counter Overfl ow Interrupt Status Register (Address Y35) (E1) Bit Name Functional Description Table 178 - Sync, CRC-4 Remote, Alarms, MAS and Phase Interrupt Status Register (Address Y34) (E1)

Zarlink Semiconductor Inc. 10 BEII Frame Alignment Signal (FAS) Bit Error Counter Indication Interrupt. This bit is one when the corresponding latched status bit (BEIL, register address Y25) is set, and the corresponding mask bit is unmasked (BEIM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 9C E O I CRC-4 Error Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (CEOL, register address Y25) is set, and the corresponding mask bit is unmasked (CEOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 8C E I I CRC-4 Error Counter Indication Interrupt. This bit is one when the corresponding latched status bit (CEIL, register address Y25) is set, and the corresponding mask bit is unmasked (CEIM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 7V E O I Bipolar Violation (BPV) Error Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (VEOL, register address Y25) is set, and the corresponding mask bit is unmasked (VEOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 6 VEII Bipolar Violation (BPV) Error Counter Indication Interrupt. This bit is one when the corresponding latched status bit (VEIL, register address Y25) is set, and the corresponding mask bit is unmasked (VEIM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 5E E O I E-Bit Error Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (EEOL, register address Y25) is set, and the corresponding mask bit is unmasked (EEOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 4 EEII E-Bit Error Counter Indication Interrupt. This bit is one when the corresponding latched status bit (EEIL, register address Y25) is set, and the corresponding mask bit is unmasked (EEIM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 3P C O I PRBS CRC-4 Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (PCOL, register address Y25) is set, and the corresponding mask bit is unmasked (PCOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 2 # not used. 1P E O I PRBS Error Counter Overflow Interrupt. This bit is one when the corresponding latched status bit (PEOL, register address Y25) is set, and the corresponding mask bit is unmasked (PEOM, register address Y45). This bit is cleared when either this register, or the latched status register is read. 0 PEII PRBS Error Counter Indication Interrupt. This bit is one when the corresponding latched status bit (PEIL, register address Y25) is set, and the corresponding mask bit is unmasked (PEIM, register address Y45). This bit is cleared when either this register, or the latched status register is read. Bit Name Functional Description Table 179 - Counter Indication and Counter Overfl ow Interrupt Status Register (Address Y35) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. 14 Sa5VI Sa5 Value Bit Interrupt. This bit is one when the corresponding latched status bit (Sa5VL, register address Y26) is set, and the corresponding mask bit is unmasked (Sa5VM, register address Y46). This bit is cleared when either this register, or the latched status register is read. Sa6V3I Sa6V2I Sa6V1I Sa6V0I Sa6 Value Bits 3-0 Interrupt. This bit is one when the corresponding latched status bit (Sa6V*L, register address Y26) is set, and the corresponding mask bit is unmasked (Sa6V*M, register address Y46). This bit is cleared when either this register, or the latched status register is read. 9S a 6 N 8 I Eight Consecutive Sa6 Nibbles Interrupt. This bit is one when the corresponding latched status bit (Sa6N8L, register address Y26) is set, and the corresponding mask bit is unmasked (Sa6N8M, register address Y46). This bit is cleared when either this register, or the latched status register is read. 8 Sa6NI Sa6 Nibble Change Interrupt. This bit is one when the corresponding latched status bit (Sa6NL, register address Y26) is set, and the corresponding mask bit is unmasked (Sa6NM, register address Y46). This bit is cleared when either this register, or the latched status register is read. 7S a N I Sa Nibble Change Interrupt. This bit is one when the corresponding latched status bit (SaNL, register address Y26) is set, and the corresponding mask bit is unmasked (SaNM, register address Y46). This bit is cleared when either this register, or the latched status register is read. 6 Sa5TI Sa5 Bit Change Interrupt. This bit is one when the corresponding latched status bit (Sa5TL, register address Y26) is set, and the corresponding mask bit is unmasked (Sa5TM, register address Y46). This bit is cleared when either this register, or the latched status register is read. 5S a T I Sa Bit Change Interrupt. This bit is one when the corresponding latched status bit (SaTL, register address Y26) is set, and the corresponding mask bit is unmasked (SaTM, register address Y46). This bit is cleared when either this register, or the latched status register is read. 4C A S R I Receive Channel Associated Signaling (CAS) Interrupt. is bit is one when the corresponding latched status bit (CASRL, register address Y24) is set, and the corresponding mask bit is unmasked (CASRM, register address Y44). This bit is cleared when either this register, or the latched status register is read. 3C A L N I CRC-4 Alignment 2 ms Timer Interrupt. This bit is one when the corresponding latched status bit (CALNL, register address Y26) is set, and the corresponding mask bit is unmasked (CALNM, register address Y46). This bit is cleared when either this register, or the latched status register is read. Table 180 - CAS, National, CRC-4 Local and Timer Interrupt Status Register (Address Y36) (E1)

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17.2.7 Interrupt Vector Mask and In terrupt Mask Registers (Y4X) Bit Functions

Tables 125 and 126 describe the bit functions of the Interrupt Vector Masks, while tables 186 to 189 describe the bit functions of each of the Interrupt Mask Registers in the MT9072. Each interrupt mask register is repeated for each of the 8 framers (not the In terrupt Vector Masks). Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most si gnificant address bits (MSB) A11-A8). In addition, a simultaneous writ e to all 8 framers is possible by se tting the MSB address to Y=8 (1000). However, since the Interrupt Vector Masks are common to all eight framers, only addresses 902 and 903 may be used to read from or write to these registers. A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible. 2T 2 I Timer 2 Interrupt. This bit is one when the corresponding latched status bit (T2L, register address Y26) is set, and the corresponding mask bit is unmasked (T2M, register address Y46). This bit is cleared when either this register, or the latched status register is read. 1T 1 I Timer 1 Interrupt. This bit is one when the corresponding latched status bit (T1L, register address Y26) is set, and the corresponding mask bit is unmasked (T1M, register address Y46). This bit is cleared when either this register, or the latched status register is read. 0 ONESECI One Second Timer Status Interrupt. This bit is one when the corresponding latched status bit (ONESECL, register address Y26) is set, and the corresponding mask bit is unmasked (ONESECM, register address Y46). This bit is cleared when either this register, or the latched status register is read. Bit Name Functional Description Table 180 - CAS, National, CRC-4 Local and Timer Interrupt Status Register (Address Y36) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-9 # not used. 8G A I M (0) GAIM When unmasked an interrupt is generated when go-ahead pattern (01111111) was detected by the HDLC receiver. 7E O P D I M (0) End of Packet Data Interrupt Mask.When unmasked an interrupt is initiated when an end of packet (EOP) byte was written into the RX FIFO by the HDLC receiver. (0) Transmit End of Packet Interrupt Mask.When unmasked an interrupt is initiated when the byte about to be read from the RX FIFO is the last byte of the packet. An interrupt is also initiated if the Rx FIFO is read and there is no data in it. 5E O P R I M (0) End of Packet Received Interrupt Mask.When unmasked an interrupt is initiated when the byte about to be read from the RX FIFO is the last byte of the packet. An interrupt is also initiated if the Rx FIFO is read and there is no data in it. 4T X F L I M (0) Transmit Fifo Low Interrupt Mask.When unmasked an interrupt is initiated when the Tx FIFO is emptied below the selected low threshold level. 3F A I M (0) Transmit Elastic Buffer full interrupt Mask. When unmasked an interrupt is initiated whenever the transmit elastic buffer is full.If 1 - masked, 0 - unmasked. (0) Transmit Fifo Underrun Interrupt Mask. interrupt is initiated for TX FIFO underrun indication.

1 RXFFIM

(0) Receive Fifo full Threshold interrupt Mask. When unmasked an interrupt is initiated whenever the Rx FIFO is filled above the selected full threshold level.

0 RXOVFLIM

(0) Receive Fifo Overflow Interrupt Mask. When unmasked an interrupt is initiated whenever the 16 byte RX FIFO overflowed (i.e. an attempt to write to a 16 byte full RX FIFO). Table 181 - HDLC Interrupt Mask Register (Address Y43) (E1) Bit Name Functional Description 15 # not used.

14 RCRCRM

(0) Remote CRC-4 and RAI Mask. This is the mask bit for the RCRCRI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

13 RSLPM

(0) Receive Slip Mask. This is the mask bit for the RSLPI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 12 YM (0) Receive Y-bit Mask. This is the mask bit for the YI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Table 182 - Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Mask Register (Address Y44) (E1)

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11 AUXPM

(0) Auxiliary Pattern Mask. This is the mask bit for the AUXPI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

10 RAIM

(0) Remote Alarm Indication Status Mask. This is the mask bit for the RAII interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 9A I S M (0) Alarm Indication Status Signal Mask. This is the mask bit for the AISI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 8A I S 1 6 M (0) Alarm Indication Signal 16 Status Mask. This is the mask bit for the AIS16I interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

7 LOSSM

(0) Loss of Signal Status Indication Mask. This is the mask bit for the LOSSI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

6 RCRC0M

(0) Remote CRC-4 and RAI T10 Mask. This is the mask bit for the RCRC0I interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

5 RCRC1M

(0) Remote CRC-4 and RAI T450 Mask. This is the mask bit for the RCRC1I interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 4C E F S M (0) Consecutively Errored Frame Alignment Signal Mask. This is the mask bit for the CEFSI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 3R F A I L M (0) Remote CRC-4 Multiframe Generator/Detector Failure Mask. This is the mask bit for the RFAILI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Bit Name Functional Description Table 182 - Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Mask Register (Address Y44) (E1)

Zarlink Semiconductor Inc.

2 CSYNCM

(0) Receive CRC-4 Synchronization Mask. This is the mask bit for the CSYNCI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

1 MSYNCM

(0) Receive Multiframe Alignment Mask. This is the mask bit for the MSYNCI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

0 BSYNCM

(0) Receive Basic Frame Alignment Mask. This is the mask bit for the BSYNCI interrupt status bit in the Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Status Register (address Y34). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Bit Name Functional Description 15 # not used.

14 SLOM

(0) Loss of Sync Counter Overflow Mask. This is the mask bit for the SLOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

13 FEOM

(0) Frame Alignment Signal (FAS) Error Counter Overflow Mask. This is the mask bit for the FEOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

12 FEIM

(0) Frame Alignment Signal (FAS) Error Counter Indication Mask. This is the mask bit for the FEII interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

11 BEOM

(0) Frame Alignment Signal (FAS) Bit Error Counter Overflow Mask. This is the mask bit for the BEOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

10 BEIM

(0) Frame Alignment Signal (FAS) Bit Error Counter Indication Mask. This is the mask bit for the BEII interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 9C E O M (0) CRC-4 Error Counter Overflow Mask. This is the mask bit for the CEOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Table 183 - Counter (Counter Indication and Counter Overflow) Interrupt Mask Register (Address Y45) (E1) Bit Name Functional Description Table 182 - Sync (Sync, CRC-4 Remote, Alarms, MAS and Phase) Interrupt Mask Register (Address Y44) (E1)

Zarlink Semiconductor Inc. 8C E I M (0) CRC-4 Error Counter Indication Mask. This is the mask bit for the CEII interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

7 VEOM

(0) Bipolar Violation (BPV) Error Counter Overflow Mask. This is the mask bit for the VEOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

6 VEIM

(0) Bipolar Violation (BPV) Error Counter Indication Mask. This is the mask bit for the VEII interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

5 EEOM

(0) E-Bit Error Counter Overflow Mask. This is the mask bit for the EEOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

4 EEIM

(0) E-Bit Error Counter Indication Mask. This is the mask bit for the EEII interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 3P C O M (0) PRBS CRC-4 Counter Overflow Mask. This is the mask bit for the PCOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 2 (0) not used.

1 PEOM

(0) PRBS Error Counter Overflow Mask. This is the mask bit for the PEOI interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

0 PEIM

(0) PRBS Error Counter Indication Mask. This is the mask bit for the PEII interrupt status bit in the Counter (Counter Indication and Counter Overflow) Interrupt Status Register (address Y35). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Bit Name Functional Description Table 183 - Counter (Counter Indication and Counter Overflow) Interrupt Mask Register (Address Y45) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15 # not used. 14 Sa5VM Sa5 Value Bit Mask. This is the mask bit for the Sa5VI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Sa6V3M Sa6V2M Sa6V1M Sa6V0M (0000) Sa6 Value Bits 3-0 Mask. This is the mask bit for the Sa6V*I interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 10 # not used.

9 Sa6N8M

(0) Eight Consecutive Sa6 Nibbles Mask. This is the mask bit for the Sa6N8I interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 8S a 6 N M (0) Sa6 Nibble Change Mask. This is the mask bit for the Sa6NI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 7S a N M (0) Sa Nibble Change Mask. This is the mask bit for the SaNI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 6S a 5 T M (0) Sa5 Bit Change Mask. This is the mask bit for the Sa5TI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 5S a T M (0) Sa Bit Change Mask. This is the mask bit for the SaTI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

4 CASRM

(0) Receive Channel Associated Signaling (CAS) Mask. This is the mask bit for the CASRI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 3C A L N M (0) CRC-4 Alignment 2ms Timer Mask. This is the mask bit for the CALNI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Table 184 - National (CAS, National, CRC-4 Local and Timers) Interrupt Mask Register (Address Y46) (E1)

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17.2.8 Transmit CAS (ABCD) Data Registers (Y51 - Y6F) Bit Functions

Table 190 describes the bit functions of each (30 registers in total, one regi ster for each PCM 30 channel) of the Transmit CAS Data Registers in the MT9072. Each regist er is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most significant address bits (M SB) A11-A8). In addition, a simultaneous write to all 8 framers is possible by setting the MSB address to Y=8 (1000). No te that if corresponding MPST bit in the per timeslot control is not set this memory will be constantly updated with CSTi values. Henc e to use this regist ers for any channels the corresponding MPST bit has to be set. A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible. 2T 2 M (0) Timer 2 Mask. This is the mask bit for the T2I interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. 1T 1 M (0) Timer 1 Mask. This is the mask bit for the T1I interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally.

0 ONESECM

(0) One Second Timer Status Mask. This is the mask bit for the ONESECI interrupt status bit in the National (CAS, National, CRC-4 Local and Timers) Interrupt Status Register (address Y36). If this mask bit is one, the corresponding interrupt bit will remain inactive. If this mask bit is zero, the corresponding interrupt bit will function normally. Bit Name Functional Description 3A ( n ) (#) Transmit Channel Associated Signaling (CAS) Signaling Bits for Channel 1 to 30. Bits for n=1 to 15 correspond to channel 1 to 15 and are transmitted on the PCM30 link in timeslot 16 in bit positions one to four in frame n. Bits for n=17 to 31 correspond to channel 16 to 30 and are transmitted on the PCM30 link in timeslot 16 in bit positions five to eight in frame n -16. The corresponding CASS(n) bit must be one for this to function. 2B ( n ) (#) 1C ( n ) (#) 0D ( n ) (#) For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03), and the timeslot control must be selected (CASS(n)=1 register address Y90 to YAF). Table 185 - Channel n, Transmit CAS Data Register (Address Y51-Y6F) (E1) Bit Name Functional Description Table 184 - National (CAS, National, CRC-4 Local and Timers) Interrupt Mask Register (Address Y46) (E1)

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17.2.9 Receive CAS (ABCD) Data Registers (Y71 - Y8F) Bit Functions

Table 191 describes the bit functions of each (30 registers in total, one regi ster for each PCM 30 channel) of the Receive CAS Data Registers in the MT 9072. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most significant address bits (MSB) A11-A8). A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible.

17.2.10 Timeslot 0-31 Control Registers (Y90 - YAF) Bit Functions

Table 191 describes the bit functions of each (32 registers in total, one register for ea ch timeslot) of the Timeslot Control Registers in the MT9072. Each register is repeated for ea ch of the 8 framers. Fr amer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 wi th Y=2 and so on up to Framer 7 wi th Y=7 (where Y represents the 4 most significant address bits (MSB) A11-A8). In addition, a simultaneous write to al l 8 framers is possible by setting the MSB address to Y=8 (1000). Note that timeslots 0 to 15 are accommodated by addresses Y90 to Y9F respectively, and timeslots 16 to 31 are accommodated by addresses YA0 to YAF respectively. A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible. Bit Name Functional Description 3A (n) (#) Receive Channel Associated Signaling (CAS) Signaling Bits for Channel 1 to 30. Bits for n=1 to 15 correspond to channel 1 to 15 and are received on the PCM30 link in timeslot 16 in bit positions one to four in frame n. Bits for n=17 to 31 correspond to channel 16 to 30 and are received on the PCM30 link in timeslot 16 in bit positions five to eight in frame n -16. 2B (n) (#) 1C (n) (#) 0D (n) (#) For these functions to be valid, CAS mode must be selected (CSIG=0 register address Y03). Table 186 - Channel n, Receive CAS Data Register (Address Y71-Y8F) Bit Name Functional Description 9R A D I ( n ) (0) Receive Alternate Digit Inversion. the data received on DSTo timeslot n from the received PCM30 link timeslot n has every second bit inverted. If zero, this bit has no effect on channel data. 8M P D R (0) Micro Port Data Receive. Setting this bit freezes the receive data for a given channel After putting the freeze the data (Y09). Table 187 - Timeslot (TS) n (n = 0 to 31) Control Register (Address Y90 (TS0) to YAF(TS31)) (E1)

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17.2.11 Transmit National Bit RN Data Registers (YB0 - YB4) Bit Functions

Table 192 describes the bit functions of each (5 registers in total, one register for each bit position) of the Transmit National Bits Data Registers in the MT9072. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most significant address bits (M SB) A11-A8). In addition, a simultaneous write to all 8 framers is possible by setting the MSB address to Y= 8 (1000). Each register cont ains one byte (8-bits) of data corresponding to eight frames of a particular bit position in timeslot 0. There are 5 r egisters in total containing 5 bytes of data, occupying addresses YB0 to YB4. Address YB0 corresponds to bi t position 4 (TN0=Sa4) and address YC4 corresponding to bit position 8 (TN4=Sa8).

7 CASS(n)

(0) Channel Associated Signaling (CAS) Source. Selects the source for the CAS data (A,B,C,D) on the transmit PCM30 link in bit positions one to four, and five to eight of timeslot 16 in frames 1 to 15. If zero, ST-BUS (CSTi) is selected as the source. If one, data register (register address Y5,6n) is selected as the source. For n=1 to 15, the CASS(n) bit corresponds to timeslot n which corresponds to channel n. For n=17 to 31, the CASS(n) bit corresponds to timeslot n which corresponds to channel n-1. 6T A D I ( n ) (0) Transmit Alternate Digit Inversion. If one, the data sourced from DSTi timeslot n (n = 0 to 31) to the transmit PCM30 link timeslot n has every second bit inverted, If zero, this bit has no effect on channel data.

5 RTSL(n)

(0) Remote Timeslot Loopback. If one, the data from the received PCM30 link timeslot n (n = 0 to 31) is output on DSTo timeslot n and is also looped back to the transmit PCM30 link timeslot n. If zero, the loopback is disabled. 4L T S L ( n ) (0) Local Timeslot Loopback. If one, the data sourced from DSTi timeslot n (n = 0 to 31) to the transmit PCM30 link timeslot n is also looped back to DSTo timeslot n. If zero, this loopback is disabled.

3 TTST(n)

(0) Transmit Test. If one and control bit ADSEQ (register address Y01) is one, the A-law digital milliwatt will be transmitted in PCM30 timeslot n. When one and ADSEQ is zero, a Pseudo-Random Bit Sequence (PRBS 2 15-1) will be transmitted in PCM30 timeslot n. More than one timeslot may be activated at once. If zero, neither of these test signals will be connected to timeslot n.

2 RRST(n)

(0) Receive Test. If one and control bit ADSEQ (register address Y01) is one, the A-law digital milliwatt will be transmitted in DSTo timeslot n. When one and ADSEQ is zero, a Pseudo Random Bit Sequence (PRBS 215-1) receiver will be connected to DSTo timeslot n. This receiver circuit will synchronize to the transmit PRBS signal and perform a bit comparison of the two sequences. If zero, neither of these test signals will be connected to the corresponding timeslot. 1M P D T ( 0 ) Micro Port Data Transmit. Setting this bit allows for the transmit data for a given channel to be replaced by the idle code(Y0A). The idle code can be written by the micro port for trunck conditioning applications. The data in Y0A will replace the appropriate PCM30 channel. 0 (#) not used. Note: For address Y90 (n=0), set all control bits to 0. Bit Name Functional Description Table 187 - Timeslot (TS) n (n = 0 to 31) Control Register (Address Y90 (TS0) to YAF(TS31)) (E1)

Zarlink Semiconductor Inc. A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible.

17.2.12 Receive National Bit RN Da ta Registers (YC0- YC4) Bit Functions

Table 193 describes the bit functions of each (5 registers in total, one register for each bit position) of the Receive National Bits Data Registers in the MT9072. Each register is repeated for each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 most significant address bits (MSB) A11-A8). Each register contains one byte (8-bits) of data corresponding to eight frames of a particular bit posit ion in timeslot 0. There are 5 regist ers in total containing 5 bytes of data, occupying addresses YC0 to YC4 Address YC0 corres ponds to bit position 4 (RN0=Sa4) and address YC4 corresponding to bit position 8 (RN4=Sa8). A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible. Bit Name Functional Description 15-8 (#### ####) not used. TNnF1 TNnF3 TNnF5 TNnF7 TNnF9 TNnF11 TNnF13 TNnF15 (0000 0000) Transmit National Bit TNnFm (n = 0 to 4, m = 1, 3, 5 etc. to 15). This bit is transmitted on the PCM30 link, in bit position n+4 of Timeslot 0 during Frame m (non-frame alignment signal (NFAS) frames) when CRC-4 multiframe alignment is used, or of consecutive odd frames when CRC-4 multiframe alignment is not used. Bit TNnFm is sourced from register address YFn as follows. TN0Fm = Address YF8 corresponds to transmit national bits Sa4Fm TN1Fm = Address YF9 corresponds to transmit national bits Sa5Fm TN2Fm = Address YFA corresponds to transmit national bits Sa6Fm TN3Fm = Address YFB corresponds to transmit national bits Sa7Fm TN4Fm = Address YFC corresponds to transmit national bits Sa8Fm Table 188 - Transmit National Bits (Sa4 - Sa8) TNn (n = 0 to 4) Data Register (R/W Address YB0 to YB4) (E1) Bit Name Functional Description 15-8 (#### ####) not used. RNnF1 RNnF3 RNnF5 RNnF7 RNnF9 RNnF11 RNnF13 RNnF15 (0000 0000) Receive National Bit RNnFm (n = 0 to 4, m = 1, 3, 5 etc. to 15). This bit is received from the PCM30 link, in bit position n+4 of Timeslot 0 during Frame m (non-frame alignment signal (NFAS) frames) when CRC-4 multiframe alignment is used, or of consecutive odd frames when CRC-4 multiframe alignment is not used. Bit RNnFm is sourced to register address YCn as follows. RN0Fm = Address YC0 corresponds to receive national bit Sa4Fm RN1Fm = Address YC1 corresponds to receive national bit Sa5Fm RN2Fm = Address YC2 corresponds to receive national bit Sa6Fm RN3Fm = Address YC3 corresponds to receive national bit Sa7Fm RN4Fm = Address YC4 corresponds to receive national bit Sa8Fm Table 189 - Receive National Bits (Sa4 - Sa8) RNn (n = 0 to 4) Data Register (R/W Address YC0 to YC4) (E1)

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17.2.13 Master Control Registers (YF0 - YF6) Bit Functions

Tables 194 to 197 describe the bit functions of each of the Master Control Registers in the MT9072 in E1 Mode(YF0 to YF6). Each register is repeated fo r each of the 8 framers. Framer 0 is addressed with Y=0, Framer 1 with Y=1, Framer 2 with Y=2 and so on up to Framer 7 with Y=7 (where Y represents the 4 mo st significant address bits (MSB) A11-A8). In addition, a simultaneous write to all 8 framers is possible by se tting the MSB address to Y=8 (1000). A (0), (1) or (#) in the “Name” column of these tables indicates the state of the data bits after a reset (RESET, RSTC or RST). The (#) indicates that a (0) or (1) is possible. Bit Name Functional Description 15-11 # not used. (0) Address Recognition. When high, this bit will enable address recognition. This forces the receiver to recognize only those packets having the unique address as programmed in the Receive Address Recognition Registers or if the address is an All Call Address.

9 RXEN

(0) Receive Enable. When low this bit will disable the HDLC receiver. The receiver will disable after the rest of the packet presently being received is finished. The receiver’s internal clock is disabled. When high the receiver will be immediately enabled (depending on the state of RXCEN input) and will begin searching for flags, Go-aheads etc.

8 TXEN

(0) Transmit Enable. When low this bit will disable the HDLC transmitter. The transmitter will disable after the completion of the packet presently being transmitted. The transmitter’s internal clock is disabled. When high the transmitter will be immediately enabled (depending on the state of the TXCEN input) and will begin transmitting data, or go to a mark idle or interframe time fill state. 7E O P (0) End of Packet When set this bit will indicate an end of packet byte to the transmitter, which will transmit an FCS following this byte. This facilitates loading of multiple packets into TX FIFO. Reset automatically after a write to the TX FIFO occurs. 6F A (0) Framer Abort.Forms a tag on the next byte written to the TX FIFO, and when set will indicate to the transmitter that it should abort the packet in which that byte is being transmitted. Reset automatically after a write to the TX FIFO. 5M I (0) Mark-Idle.When low, the transmitter will be in an idle state. When high it is in an interframe time fill state. These two states will only occur when the TX FIFO is empty. 4C Y C L E (0) Cycle.When high, this bit will cause the transmit byte count to cycle through the value loaded into the Transmit Byte Count Register. (0) Transmit CRC Inhibit. When high, this bit will inhibit transmission of the CRC. That is, the transmitter will not insert the computed CRC onto the bit stream after seeing the EOP tag byte. This is used in V.120 terminal adaptation for synchronous protocol sensitive UI frames. (0) Seven. When high, this bit will enable seven bits of address recognition in the first address byte. The received address byte must have bit 0 equal to 1 which indicates a single address byte is being received. Table 190 - HDLC Control1(YF2) (E1)

Zarlink Semiconductor Inc. 1R X F R S T (0) Rx Fifo Reset. When high, the RX FIFO will be reset. This causes the receiver to be disabled until the next reception of a flag. The status register will identify the FIFO as being empty. However, the actual bit values in the RX FIFO will not be reset. 0T X F R S T (0) Transmit FIFO Reset. When high, the TX FIFO will be reset. The Status Register will identify the FIFO as being empty. This bit will be reset when data is written to the TX FIFO. However, the actual bit values of data in the TX FIFO will not be reset. Bit Name Functional Description 15-6 # not used. 5H R S T (0) HDLC Reset. When this bit is high, the HDLC and HDLC registers will be reset (HDLC Control, HDLC Test Control, Address Recognition Byte). This is similar to RESET being applied, the only difference being that this bit will not be reset. This bit can only be reset by writing a zero to this location or applying RESET. (0) Receive Transmit Loopback. When this bit is high, receive to transmit HDLC loopback will be activated. Receive data, including end of packet indication, but not including flags or CRC, will be written to the TX FIFO as well as the RX FIFO. When the transmitter is enabled, this data will be transmitted as though written by the microprocessor. Both good and bad packets will be looped back. Receive to transmit loopback may also be accomplished by reading the RX FIFO using the microprocessor and writing these bytes, with appropriate tags, into the TX FIFO. (0) CRC Test. This bit allows direct access to the CRC Comparison Register in the receiver through the serial interface. After testing is enabled, serial data is clocked in until the data aligns with the internal comparison (16 RXC clock cycles) and then the clock is stopped. The expected pattern is F0B8 hex. Each bit of the CRC can be corrupted to allow more efficient testing. 2F T S T (0) Fifo Test. This bit allows the writing to the RX FIFO and reading of the TX FIFO through the microprocessor to allow more efficient testing of the FIFO status/interrupt functionality. This is done by making a TX FIFO write become a RX FIFO write and a RX FIFO read become a TX FIFO read. In addition, EOP/FA and RQ8/RQ9 are re-defined to be accessible (i.e. RX write causes EOP/FA to go to RX fifo input; TX read looks at output of TX fifo through RQ8/RQ9 bits). 1A D T S T (0) Address Recognition Test. This bit allows direct access to the Address Recognition Registers in the receiver through the serial interface to allow more efficient testing. After address testing is enabled, serial data is clocked in until the data aligns with the internal address comparison (16 RXc clock cycles) and then clock is stopped. Then the VADDR bit in Y1C can be checked. (0) HDLC Loopback. When high, transmit to receive HDLC loopback will be activated. The packetized transmit data will be looped back to the receive input. RXEN and TXEN bits must also be enabled. Table 191 - HDLC Test Control(YF3) (E1) Bit Name Functional Description Table 190 - HDLC Control1(YF2) (E1)

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17.2.14 Global Control and Status Registers(900-91F) Bit Functions

The Global Control and Status Registers are common to th e T1 and E1 operation. The global registers are accessed by address hex 9xx ( A11 and A8 being high and A10 and A9 being low) Bit Name Functional Description 15-8 # not used. 7 - 0 BIT7-0 (00000000) This eight bit word is tagged with the two status bits from control register 1 (EOP and FA), and the resulting 10 bit word is written to the TX FIFO. The FIFO status is not changed immediately after a write or read occurs. It is updated after the data has settled and the transfer to the last available position has finished. Note that when the HDLC is connected to a T1 channel, the least significant bit in the FIFO is sent first. Table 192 - TX Fifo Write Register(YF5) (E1) Bit Name Functional Description 15-8 # not used. 7 - 0 CNT7-0 (00000000) The Transmit Byte Count Register indicating the length of the data portion of the packet about to be transmitted. This is the size of the data and not the address, flags or FCS. The Transmit Byte Counter position Y1C determines the number of bytes that have been sent from the Transmit FIFO. Table 193 - TX Byte Count Register(YF6) (E1) Bit Name Functional Description (1) T1E0. This bit determines if the chip will operate in T1 or E1 mode for all 8 framers. If the value of this bit is changed the chip is reset in E1 or T1 default register mode. If the bit is set to 1, all the framer register values are set to T1 defaults. For a setting of 0 the register values are set to E1 defaults. This action takes approximately 34 1.5444 clock cycles. Hence any writes to registers should be done on the next 125 usec frame after setting or clearing this bit. (0) ST-BUS Enable. If zero, ST-BUS timing is enabled. If one, GCI timing is enabled (only available for 2.048 Mb/s mode). See Figures 24-31. 13-5 # not used 4C K 1 Clock Rate. These clock select bits determine the system clock at the CKi pin and the receive frame pulse at the FPi pin as follows (See Figures 24 to 31): CK1 Clock Frame Pulse System Bus 0 4.096 MHz 2.048 Mb/s 2.048 Mb/s 1 16.384 MHz 8.192 Mb/s 8.192 Mb/s 3-1 # not used. 0R S T C (0) Common Reset. When this bit is changed from zero to one, all eight framers will reset to their default T1 mode. This software reset has the same effect as the RESET pin. See the Reset Operation section for the default settings. Table 194 - Global Control0 Register (R/W Address 900) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description 15-11 CHANNUM (00000) Channel Number. These 5 bits determine the channel that is used for updating of the ST-BUS Analyzer buffer. 10-8 # not used. 7-6 STRNUM (00000) Stream Number. These 5 bits determine the streams that will be used as the source data for the ST-BUS Analyzer buffer. 00: Dsti 01: DSTo 10: Csti 11: Csto 5S T B U F E N (0) ST-BUS Analyser Buffer Enable. Setting this bit enables the ST-BUS Analyser Buffer update. When the user reads the buffer(920-93F), this bit must be 0. Any reads of the buffer while this bit is set does not ensure correct data being read. 4-2 FNUM (000) Framer Number. 0 to 7. (0) Channel Update. If 0 the update of the memory is at frame rate for a given channel. The channel selected for update is provided by the ChanNum bits of this register. If set the complete frame(channels 0 to 32) are updated to the buffer. 0C O N T S I N (0) Continuous Single. If set to 1 the ST-BUS Analyzer buffer is updated continuously. If set to zero the buffer is updated once and stopped. An optional interrupt can be generated once the buffer is full. Table 195 - Global Control1 Register (R/W Address 901) (E1) Bit Name Functional Description (0) Framer 3 HDLC Mask. This is the mask bit for the F3HVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 3 Elastic Mask. This is the mask bit for the F3EVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 3 Rx Line Mask. This is the mask bit for the F3RVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 3 Sync and Overflow Mask. This is the mask bit for the F3SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Table 196 - Interrupt Vector 1 Mask Register (R/W Address 902) (E1)

Zarlink Semiconductor Inc. (0) Framer 2 HDLC Mask. This is the mask bit for the F2HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 2 Elastic Mask. This is the mask bit for the F2EVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 9F 2 R M (0) Framer 2 Rx Line Mask. This is the mask bit for the F2RVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 8F 2 S M (0) Framer 2 Sync and Overflow Mask. This is the mask bit for the F2SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 7F 1 H M (0) Framer 1 HDLC Mask. This is the mask bit for the F1HVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 6F 1 E M (0) Framer 1 Elastic Mask. This is the mask bit for the F1EVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 5F 1 R M (0) Framer 1 Rx Line Mask. This is the mask bit for the F1RVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 4F 1 S M (0) Framer 1 Sync and Overflow Mask. This is the mask bit for the F1SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 3F 0 H M (0) Framer 0 HDLC Mask. This is the mask bit for the F0HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Bit Name Functional Description Table 196 - Interrupt Vector 1 Mask Register (R/W Address 902) (E1)

Zarlink Semiconductor Inc. 2F 0 E M (0) Framer 0 Elastic Mask. This is the mask bit for the F0EVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 1F 0 R M (0) Framer 0 Rx Line Mask. This is the mask bit for the F0RVS status bit in the Interrupt Vector Register(address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 0F 0 S M (0) Framer 0 Sync and Overflow Mask. This is the mask bit for the F0SVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Bit Name Functional Description (0) Framer 7 HDLC Mask. This is the mask bit for the F7HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 7 Elastic Mask. This is the mask bit for the F7EVS status bit in the Interrupt Vector Register(address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 7 Rx Line Mask. This is the mask bit for the F7RVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 7 Sync and Overflow Mask. This is the mask bit for the F7SVS status bit in the Interrupt Vector Register(address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 11 F6HM Framer 6 HDLC Mask. This is the mask bit for the F6HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. (0) Framer 6 Elastic Mask. This is the mask bit for the F6EVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Table 197 - Interrupt Vector 2 Mask Register (R/W Address 903) (E1) Bit Name Functional Description Table 196 - Interrupt Vector 1 Mask Register (R/W Address 902) (E1)

Zarlink Semiconductor Inc. 9F 6 R M (0) Framer 6 Rx LineMask. This is the mask bit for the F6RVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 8F 6 S M (0) Framer 6 Sync and Overflow Mask. This is the mask bit for the F6SVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 7F 5 H M (0) Framer 5 HDLC Mask. This is the mask bit for the F5HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 6F 5 E M (0) Framer 5 Elastic Mask. This is the mask bit for the F5EVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 5F 5 R M (0) Framer 5 Rx Line Mask. This is the mask bit for the F5RVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 4F 5 S M (0) Framer 5 Sync and Overflow Mask. This is the mask bit for the F5SVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 3F 4 H M (0) Framer 4 HDLC Mask. This is the mask bit for the F5HVS status bit in the Interrupt Vector Register (address 910). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 2F 4 E M (0) Framer 4 Elastic Mask. This is the mask bit for the F4EVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 1F 4 R M (0) Framer 4 Rx Line Mask. This is the mask bit for the F4RVS status bit in the Interrupt Vector register(address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. 0F 4 S M (0) Framer 4 Sync and Overflow Mask. This is the mask bit for the F4SVS status bit in the Interrupt Vector Register (address 911). If this mask bit is one, the corresponding Interrupt Vector status bit will remain inactive (zero). If this mask bit is zero, the corresponding Interrupt Vector status bit will function normally. Bit Name Functional Description Table 197 - Interrupt Vector 2 Mask Register (R/W Address 903) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description (0) ST-BUS Loopback 8 M All. If one, DSTo[0] is connected to DSTi[4], and DSTo[4] is connected (0) ST-BUS Loopback Framer 6 & 7. If one, DSTo[6] is connected to DSTi[7], and DSTo[7] is connected to DSTi[6]. Used only in 2.048 Mb/s mode. See Loopback section for details. (0) ST-BUS Loopback Framer 4 & 5. If one, DSTo[4] is connected to DSTi[5], and DSTo[5] is connected to DSTi[4]. Used only in 2.048 Mb/s mode. See Loopbacks section. (0) ST-BUS Loopback Framer 2 & 3. If one, DSTo[2] is connected to DSTi[3], and DSTo[3] is connected to DSTi[2]. Used only in 2.048 Mb/s mode. See Loopbacks section. (0) ST-BUS Loopback Framer 0 & 1. If one, DSTo[0] is connected to DSTi[1], and DSTo[1] is connected to DSTi[0]. Used only in 2.048 Mb/s mode. See Loopbacks section. (0) Remote Loopback 8 Framers. If one, TPOS[0]/TNEG[0] are connected to RPOS[4]/RNEG[4], and TPOS[4]/TNEG[4] are connected to RPOS[0]/RNEG[0]. This is used especially for 8.192 Mbit/s mode but may also be used in 2.048 Mb/s mode. See Loopbacks section. (0) Remote Loopback Framer 6 & 7. If one, TPOS[6]/TNEG[6] are connected to RPOS[7]/RNEG[7], and TPOS[7]/TNEG[7] are connected to RPOS[6]/RNEG[6]. Used only in 2.048 Mb/s mode. See Loopbacks section. (0) Remote Loopback Framer 4 & 5. If one, TPOS[4]/TNEG[4] are connected to RPOS[5]/RNEG[5], and TPOS[5]/TNEG[5] are connected to RPOS[4]/RNEG[4]. Used only in 2.048 Mb/s mode. See Loopbacks section. (0) Remote Loopback Framer 2 & 3. If one, TPOS[2]/TNEG[2] are connected to RPOS[3]/RNEG[3], and TPOS[3]/TNEG[3] are connected to RPOS[2]/RNEG[2]. Used only in 2.048 Mb/s mode. See Loopbacks section. (0) Remote Loopback Framer 0 & 1. If one, TPOS[0]/TNEG[0] are connected to RPOS[1]/RNEG[1], and TPOS[1]/TNEG[1] are connected to RPOS[0]/RNEG[0]. Used only in 2.048 Mb/s mode. See Loopbacks section. 5-0 (000000) not used. Table 198 - Framer Loopback Global Register(904) (E1)

Zarlink Semiconductor Inc. Bit Name Functional Description (0) Framer 3 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(333) for framer are set. This bit can be masked and will remain low by the F3HM bit in address 902. (0) Framer 3 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(336) or Elastic store status for Framer 3 are set. This bit can be masked and will remain low by the F3EM bit in address 902. (0) Framer 3 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(335) for Framer 0 are set. This bit can be masked and will remain low by the F3RM bit in address 902. (0) Framer 3 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(334) for Framer 3 are set. This bit can be masked and will remain low by the F3SM bit in address 902. (0) Framer 2 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(233) or Elastic store status far Framer 2 are set. This bit can be masked and will remain low by the F2HM bit in address 902. (0) Framer 2 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elastic status register(236) or Elastic store status for Framer 2 are set. This bit can be masked and will remain low by the F2EM bit in address 902. 9F 2 R V S (0) Framer 2 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(235) for Framer 2 are set. This bit can be masked and will remain low by the F2RM bit in address 902. 8F 2 S V S (0) Framer 2 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Counter status register(234) for Framer 2 are set. This bit can be masked and will remain low by the F2SM bit in address 902. 7F 1 H V S (0) Framer 1 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(133) or Elastic store status for Framer 1 are set. This bit can be masked and will remain low by the F2HM bit in address 902. 6F 1 E V S (0) Framer 1 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(136) or Elastic store status for Framer 1 are set. This bit can be masked and will remain low by the F1EM bit in address 902. 5F 1 R V S (0) Framer 1 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(135) for Framer 1 are set. This bit can be masked and will remain low by theF1RM bit in address 902. 4F 1 S V S (0) Framer 1 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(134) for Framer 3 are set. This bit can be masked and will remain low by the F1SM bit in address 902. 3F 0 H V S (0) Framer 0 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(033) or Elastic store status for Framer 0 are set. This bit can be masked and will remain low by the F0HM bit in address 902. 2F 0 E V S (0) Framer 0 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(036) or Elastic store status for Framer 0 are set. This bit can be masked and will remain low by the F0EM bit in address 902. Table 199 - Interrupt Vector 1 Status Register (R/W Address 910) (E1)

Zarlink Semiconductor Inc. 1F 0 R V S (0) Framer 0 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(035) for Framer 0 are set. This bit can be masked and will remain low by the F0RM bit in address 902. 0F 0 S V S (0) Framer 0 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(034) for Framer 0 are set. This bit can be masked and will remain low by the F0SM bit in address 902. Bit Name Functional Description (0) Framer 3 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(733) for Framer 7 are set. This bit can be masked and will remain low by the F7HM bit in address 903. (0) Framer 7 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(736) or Elastic store status for Framer 7 are set. This bit can be masked and will remain low by the F7EM bit in address 903. (0) Framer 7 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(735) for Framer 7 are set. This bit can be masked and will remain low by the F7RM bit in address 903 . (0) Framer 7 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(734) for Framer 3 are set. This bit can be masked and will remain low by the F7SM bit in address 903. (0) Framer 6 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(663) or Elastic store status for Framer 6 are set. This bit can be masked and will remain low by the F7HM bit in address 903. (0) Framer 6 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(636) or Elastic store status for Framer 5 are set. This bit can be masked and will remain low by the F5EM bit in address 903. 9F 6 R V S (0) Framer 6 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(635) for Framer 6 are set. This bit can be masked and will remain low by the F6RM bit in address 903. 8F 6 S V S (0) Framer 6 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Counter status register(634) for Framer 6 are set. This bit can be masked and will remain low by the F6SM bit in address 903. 7F 5 H V S (0) Framer 3 HDLC Vector Status. This bit if unmasked is set if any of the bits in the Interrupt HDLC register(533) or Elastic store status for Framer 5 are set. This bit can be masked and will remain low by the F7HM bit in address 903. 6F 5 E V S (0) Framer 5 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(536) or Elastic store status for Framer 5 are set. This bit can be masked and will remain low by the F5EM bit in address 903. Table 200 - Interrupt Vector 2 Status Register (Address 911) (E1) Bit Name Functional Description Table 199 - Interrupt Vector 1 Status Register (R/W Address 910) (E1)

Zarlink Semiconductor Inc. 5F 5 R V S (0) Framer 5 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(535) are Framer 5 are set. This bit can be masked and will remain low by theF1RM bit in address 903. 4F 5 S V S (0) Framer 5 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(534) for Framer 5 are set. This bit can be masked and will remain low by the F1SM bit in address 903. 3F 4 H V S (0) Framer 4 HDLC Vector Status. This bit if unmasked is set if any of the bits in the HDLC status register(433)status for Framer 4 are set. This bit can be masked and will remain low by the F7HM bit in address 903. 2F 4 E V S (0) Framer 4 Elastic Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Elasitc store register(436) or Elastic store status for Framer 4 are set. This bit can be masked and will remain low by the F4EM bit in address 903. 1F 4 R V S (0) Framer 4 Rx Line Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Receive Line status register(435) for Framer 4 are set. This bit can be masked and will remain low by the F4RM bit in address 903. 0F 4 S V S (0) Framer 4 Sync Vector Status. This bit if unmasked is set if any of the bits in the Interrupt Sync status register(434) Framer 4 are set. This bit can be masked and will remain low by the F4SM bit in address 903. Bit Name Functional Description 15-3 ID15-3 ID Number. Contains 0100000001011. ID2-0 (000) These 3 bits make up a binary code which identify the revision of this deviceID Number. Table 201 - Identification Revision Code Data Register (R Address 912) (E1) Bit Name Functional Description 15-1 # not used. 0S T I S (0) ST-BUS Analyser Interrupt Status. This bit is set if the ST-BUS Analyser is filled up. Table 202 - ST-BUS Analyzer Vector Status Register (Address 913) (E1) Bit Name Functional Description 15-8 # not used. 7-0 STAD (7-0) (0) ST-BUS Analyser Data. This is the data for the ST-BUS analyser buffer. 920 is the first byte of the data that is being "analyzed". The source of the data can be any ST-BUS stream from any Framer. Table 203 - ST-BUS Analyser Data (Address 920-93F) (E1) Bit Name Functional Description Table 200 - Interrupt Vector 2 Status Register (Address 911) (E1)

Zarlink Semiconductor Inc.

18.0 Applications

18.1 T1 Applications

Figure 11 - 8 T1 Links with Synchronous Common Channel Signaling for up to 24 Channels RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 RCLK, TCLK RSP TSP Receive xfmr RCLK RDATA RSP SCLK TCLK TDATA TSP HDLC PRI SEC F0o C2o C4o C16o RCLK RSP TSP PLL From RCLK’s of LIU’s Notes: Framer 1-8, 1 of MT9072 LIU 1-8, * of Generic LIU PLL, 1 of MT9044 HDLC, 1 of PEB 20320 (MUNICH 32) - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo DSTi CSTi CKi FPi Framer 8/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 HDLC Timing Framers 2 to 7 DSTo CSTo DSTi CSTi CKi FPi LIU’s 2 to 7

Zarlink Semiconductor Inc. Figure 12 - 8 T1 Links with Synchronous Data Link Signaling RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr PRI SEC F0o C2o C4o PLL From RCLK’s of LIU’s Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU’s PLL, 1 of MT9042 HDLC, 8 of MT8952 - Framer elastic buffer is used. - Data Link data passes through the elastic buffer. - TxDLC outputs an enable signal - LIU Transmit JA and PLL are bypassed. - The MT8952B is in External Timing mode. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo TxDL TxDLC CKi FPi LIU’s 2 to 7 CDSTi RxCEN CDSTo TxCEN CKi HDLC 1/8 CDSTi RxCEN CDSTo TxCEN CKi HDLC 2 to 7 CDSTi RxCEN CDSTo TxCEN CKi HDLC 8/8 RPOS RNEG EXCLi TPOS TNEG TXCL DSTo TxDL TxDLC CKi FPi Framer 1/8 RPOS RNEG EXCLi TPOS TNEG TXCL DSTo TxDL TxDLC CKi FPi Framer 8/8

Zarlink Semiconductor Inc. Figure 13 - 8 T1 Links with Asynchronous Data Link Signaling Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 HDLC, 8 of MT8952 - Framer elastic buffer is used. - Data Link data passes through the elastic buffer. - TxDLC & RXDLC outputs an enable signal - LIU Transmit JA and PLL are bypassed. - The MT8952B is in External Timing mode. RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr PRI SEC F0o C2o C4o PLL From RCLK’s of LIU’s LINES 2 to 7 Framers 2 to 7 RxDL RxDLC TxDL TxDLC CKi FPi LIU’s 2 to 7 RPOS RNEG EXCLi TPOS TNEG TXCL RxDL RxDLC TxDL TxDLC CKi FPi Framer 1/8 CDSTi RxCEN CDSTo TxCEN CKi HDLC 1/16 CDSTi RxCEN CDSTo TxCEN CKi HDLC 3-15 odd CDSTi RxCEN CDSTo TxCEN CKi HDLC 2/16 CDSTi RxCEN CDSTo TxCEN CKi HDLC 4-16 even RCLK

Zarlink Semiconductor Inc. Figure 14 - 8 T1 Links with no JA or PLL in LIU, Slave or Master Mode, Jitter-Free ST-BUS RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr From RCLK’s of LIU’sNotes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 LDX, 1 of MT90820 - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo CSTo DSTi CSTi CKi FPi LIU’s 2 to 7 STi0 STo0 STi1-6 STo1-6 STi7 STo7 STi8-15 STo8-15 i C4i LDX PRI SEC F0o C2o C4o PLL RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo DSTi CSTi CKi FPi Framer 8/8 RXDLC

Zarlink Semiconductor Inc. Figure 15 - 8 T1 Links with ATM IMA with Synchronous ST-BUS Mode RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr From RCLK’s of LIU’s Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 ATM IMA - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo CSTo DSTi CSTi CKi FPi LIU’s 2 to 7 DSTi0 DSTo0 DSTi 1-6 DSTo1-6 DSTi7 SSTo7 RxSYNCi RxCKi IMA PRI SEC F8o C2o C1.5o PLL ATM BUS RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo DSTi CSTi CKi FPi Framer 8/8 RxDLC RxDLC

Zarlink Semiconductor Inc. Figure 16 - 8 T1 Links with Asynchronous ST-BUS RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo RxDL DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 8 of MT9041 - Framer elastic buffer is optional with DSTo and CSTo. - Framer elastic buffer is not used with RxDL. - LIU Transmit JA and PLL are bypassed. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo CSTo RxDL DSTi CSTi CKi FPi LIU’s 2 to 7 PRI F0o C2o C4o PLL 1/8 RCLK PRI F0o C2o C4o PLL 2 to 7 PRI F0o C2o C4o PLL 8/8 RPOS RNEG EXCLi TPOS TNEG TXCL DSTo CSTo RxDL DSTi CSTi CKi FPi Framer 8/8

Zarlink Semiconductor Inc.

18.2 E1 Applications

Figure 17 - 8 E1 Links with ATM IMA with Asynchronous ST-BUS Mode RPOS RNEG EXCLi TPOS TNEG TXCL DSTo RxDLC RxBF DSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 IMA - Framer elastic buffer is bypassed at DSTo. - LIU Transmit JA and PLL are enabled. - Transmit and receive paths may be asynchronous with each other. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo RxDLC RxBF DSTi CKi FPi LIU’s 2 to 7 DSTi0 RxCK0 RxSYNC0 DSTo0 TxCK0 TxSYNC0 DSTi 1-6 RxCK1-6 RxSYNC1-6 DSTo1-6 TxCK1-6 TxSYNC1-6 DSTi7 RxCK7 RxSYNC7 DSTo7 TxCK7 TxSYNC7 PLLREF0 PLLREF1 REFCK0 IMA PRI SEC F0o C2o C4o PLL ATM BUS C1.5i GCI Timing F0 = FPi = TxSYNCo F0 = RxBF = RxSYNCo C1.5 = RxDLC = RxCKo c1.5i= CKi = TxCKo Bits RPOS RNEG EXCLi TPOS TNEG TXCL DSTo RxDLC RxBF DSTi CKi FPi Framer 8/8

Zarlink Semiconductor Inc. Figure 18 - 8 E1 Links with Synchronous Common Channel Signaling for up to 24 Channels RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 RCLK, TCLK RSP TSP Receive xfmr RCLK RDATA RSP SCLK TCLK TDATA TSP HDLC PRI SEC F0o C2o C4o C16o RCLK RSP TSP PLL From RCLK’s of LIU’s Notes: Framer 1-8, 1 of MT9072 LIU 1-8, of Generic LIU PLL, 1 of MT9044 HDLC, 1 of PEB 20320 (MUNICH 32) - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 8/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 HDLC Timing Framers 2 to 7 DSTo CSTo DSTi CSTi CKi FPi LIU’s 2 to 7

Zarlink Semiconductor Inc. Figure 19 - E3 (34 Mb/s) MUX Cross Connect with 16 Asynchronous E1 Links PRI SEC F0o C2o C4o PLL Notes: Framer 1-16, 2 of MT9072 LDX, 1 of MT90820 PLL, 1 of MT9042 - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. Framers 2 to 15 DSTo CSTo DSTi CSTi CKi FPi RXPOS RXNEG R34CK TXPOS TXNEG T34CK E3 MUX RPOS RNEG RCLK TPOS TNEG TCLK E3 LIU RT RR TT TR Transmit xfmr E3 LINE Receive xfmr RPOS RNEG E2i TPOS TNEG T20 STi0 STo0 STi1-14 STo1-14 STi15 STo15 F0i C4i LDX RPOS RNEG RCLK TPOS TNEG TCLK RPOS RNEG RCLK TPOS TNEG TCLK RPOS RNEG RCLK TPOS TNEG TCLK From RCLK’s of E3 MUX RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 1/16 RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 1/16

Zarlink Semiconductor Inc. Figure 20 - E3 (34 Mb/s) MUX Concentrator to 16 Asynchronous E1 Links Notes: LIU 1-8, 8 of Generic LIU - LIU Transmit JA and PLL are not bypassed. RXPOS RXNEG R34CK TXPOS TXNEG T34CK E3 MUX RPOS RNEG RCLK TPOS TNEG TCLK E3 LIU RT RR TT TR Transmit xfmr E3 LINE Receive xfmr RPOS RNEG RCLK TPOS TNEG TCLK RPOS RNEG RCLK TPOS TNEG TCLK RPOS RNEG RCLK TPOS TNEG TCLK TPOS TNEG TCLK RPOS RNEG RCLK LIU 1/16 TT TR RT RR Transmit xfmr LINE 1 Receive xfmr TPOS TNEG TCLK RPOS RNEG RCLK LIU 16/16 TT TR RT RR Transmit xfmr LINE 16 Receive xfmr TPOS TNEG TCLK RPOS RNEG RCLK LIU 2-15 TT TR RT RR Transmit xfmr LINE 2 to 15 Receive xfmr

Zarlink Semiconductor Inc. Figure 21 - 8 E1 Links with Synchronous Data Link Signaling RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr PRI SEC F0o C2o C4o PLL From RCLK’s of LIU’s Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 4 of Generic LIU PLL, 1 of MT9042 HDLC, 8 of MT8952 - Framer elastic buffer is used. - Data Link data passes through the elastic buffer. - TxDLC outputs an enable signal - LIU Transmit JA and PLL are bypassed. - The MT8952B is in External Timing mode. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo TxDL TxDLC CKi FPi LIU’s 2 to 7 CDSTi RxCEN CDSTo TxCEN CKi HDLC 1/8 CDSTi RxCEN CDSTo TxCEN CKi HDLC 2 to 7 CDSTi RxCEN CDSTo TxCEN CKi HDLC 8/8 RPOS RNEG E2i TPOS TNEG T2o DSTo TxDL TxDLC CKi FPi Framer 1/8 RPOS RNEG E2i TPOS TNEG T2o DSTo TxDL TxDLC CKi FPi Framer 8/8

Zarlink Semiconductor Inc. Figure 22 - 8 E1 Links with Asynchronous Data Link Signaling Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 HDLC, 8 of MT8952 - Framer elastic buffer is used. - Data Link data passes through the elastic buffer. - TxDLC & RXDLC outputs an enable signal - LIU Transmit JA and PLL are bypassed. - The MT8952B is in External Timing mode. RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr PRI SEC F0o C2o C4o PLL From RCLK’s of LIU’s LINES 2 to 7 Framers 2 to 7 RxDL RxDLC TxDL TxDLC CKi FPi LIU’s 2 to 7 RPOS RNEG E2i TPOS TNEG T2o RxDL RxDLC TxDL TxDLC CKi FPi Framer 1/8 CDSTi RxCEN CDSTo TxCEN CKi HDLC 1/16 CDSTi RxCEN CDSTo TxCEN CKi HDLC 3-15 odd CDSTi RxCEN CDSTo TxCEN CKi HDLC 2/16 CDSTi RxCEN CDSTo TxCEN CKi HDLC 4-16 even RCLK

Zarlink Semiconductor Inc. Figure 23 - 8 E1 Links with no JA or PLL in LIU, Slave or Master Mode, Jitter-Free ST-BUS RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr From RCLK’s of LIU’sNotes: Framer 1-8, 1 of MT9072 LIU 1-8, * of Generic LIU PLL, 1 of MT9042 LDX, 1 of MT90820 - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo CSTo DSTi CSTi CKi FPi LIU’s 2 to 7 STi0 STo0 STi1-6 STo1-6 STi7 STo7 STi8-15 STo8-15 i C4i LDX PRI SEC F0o C2o C4o PLL RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 8/8

Zarlink Semiconductor Inc. Figure 24 - 8 E1 Links with ATM IMA with Synchronous ST-BUS Mode RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr From RCLK’s of LIU’s Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 IMA - Framer elastic buffer is used. - LIU Transmit JA and PLL are bypassed. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo CSTo DSTi CSTi CKi FPi LIU’s 2 to 7 DSTi0 DSTo0 DSTi 1-6 DSTo1-6 DSTi7 SSTo7 RxSYNCi RxCKi IMA PRI SEC F0o C2o C4o PLL ATM BUS RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo DSTi CSTi CKi FPi Framer 8/8

Zarlink Semiconductor Inc. Figure 25 - 8 E1 Links with ATM IMA with Asynchronous ST-BUS Mode RPOS RNEG E2i TPOS TNEG T2o DSTo RxDLC RxBF DSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr Notes: Framer 1-8, 1 of MT9072 LIU 1-8, 8 of Generic LIU PLL, 1 of MT9042 IMA - Framer elastic buffer is bypassed at DSTo. - LIU Transmit JA and PLL are enabled. - Transmit and receive paths may be asynchronous with each other. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo RxDLC RxBF DSTi CKi FPi LIU’s 2 to 7 DSTi0 RxCK0 RxSYNC0 DSTo0 TxCK0 TxSYNC0 DSTi 1-6 RxCK1-6 RxSYNC1-6 DSTo1-6 TxCK1-6 TxSYNC1-6 DSTi7 RxCK7 RxSYNC7 DSTo7 TxCK7 TxSYNC7 PLLREF0 PLLREF1 REFCK0 IMA PRI SEC F0o C2o C4o PLL ATM BUS ST-BUS Timing F0 = FPi = TxSYNCo F0 = RxBF = RxSYNCo C4 = RxDLC = RxCKo C4 = CKi = TxCKo Bits RPOS RNEG E2i TPOS TNEG T2o DSTo RxDLC RxBF DSTi CKi FPi Framer 8/8

Zarlink Semiconductor Inc. Figure 26 - 8 E1 Links with Asynchronous ST-BUS RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo RxDL DSTi CSTi CKi FPi Framer 1/8 RPOS RNEG RCLK TPOS TNEG TCLK LIU 1/8 RT RR TT TR Transmit xfmr LINE 1 Receive xfmr Notes: Framer 1-8, 1 of MT9072 LIU 1-8, * of Generic LIU PLL, 8 of MT9041 - Framer elastic buffer is optional with DSTo and CSTo. - Framer elastic buffer is not used with RxDL. - LIU Transmit JA and PLL are bypassed. RPOS RNEG RCLK TPOS TNEG TCLK LIU 8/8 RT RR TT TR Transmit xfmr LINE 8 Receive xfmr LINES 2 to 7 Framers 2 to 7 DSTo CSTo RxDL DSTi CSTi CKi FPi LIU’s 2 to 7 PRI F0o C2o C4o PLL 1/8 RCLK PRI F0o C2o C4o PLL 2 to 7 PRI F0o C2o C4o PLL 8/8 RPOS RNEG E2i TPOS TNEG T2o DSTo CSTo RxDL DSTi CSTi CKi FPi Framer 8/8

Zarlink Semiconductor Inc.

19.0 AC/DC Electrical Characteristics

19.1 General

Voltages are with respect to ground (VSS) unless otherwise stated. * Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied. † Characteristics are for clocked operation over the ranges of recommended operating temperature and supply voltage. ‡Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing. Absolute Maximum Ratings* Parameter Symbol Min. Max. Units 1 Supply Voltage V DD -0.3 5.5 V 2 Voltage at Digital Inputs V I -0.3 V DD + 0.3 V

3 Current at Digital Inputs I I 30 mA

4 Voltage at Digital Outputs V O -0.3 V DD + 0.3 V

5 Current at Digital Outputs I O 30 mA

6 Storage Temperature T ST -65 150 °C

Recommended Operating Conditions* - Voltages are with respect to gr ound (VSS) unless otherwise stated Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Operating Temperature T OP -40 25 85 °C

2 Supply Voltage V DD 3.0 3.3 3.6 V Characteristics Sym. Min. Typ. ‡ Max. Units Test Conditions 1 Supply Current I DD 30 mA Outputs unloaded. Transmitting an all 1’s signal. 2 Input High Voltage (Digital Inputs) V IH 2.0 V DD V 3 Input Low Voltage (Digital Inputs) V IL 00 . 8 V

4 Input Leakage (Digital Inputs) I IL 11 0 µAV I = 0 to VDD

5 Output High Voltage (Digital

Outputs) VOH 2.4 V DD VI OH = 7 mA @ VOH = 2.4 V

6 Output High Current (Digital

Outputs) IOH 7 mA Source V OH=2.4 V 7 Output Low Voltage (Digital Outputs) V OL VSS 0.4 V I OL = 2 mA @ VOL = 0.4 V 8 Output Low Current (Digital Outputs) I OL 2m A S i n k V OL = 0.4 V

9 High Impedance Leakage (Digital

I/O) IOZ 11 0 µAV O = 0 to VDD

Zarlink Semiconductor Inc. * Timing for output signals is based on the worst case result of the combination of TTL and CMOS thresholds. Figure 27 - Timing Parameter Measurement Voltage Levels ‡Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing. Note 1. High impedance is measured by pulling to the appropriate rail with R L, with timing corrected to cancel time taken to discharge C L. ground (VSS) unless otherwise stated. Characteristics Sym. Level Units Conditions/Notes 1 Threshold Voltage V T 1.5 0.5∗VDD V V TTL CMOS 2 Rise/Fall Threshold Voltage High V HM 2.0 0.7∗VDD V V TTL CMOS 3 Rise/Fall Threshold Voltage Low V LM 0.8 0.3∗VDD V V TTL CMOS Characteristics Sym. Min. Typ. ‡ Max. Units Test Conditions 1D S low t DSL 115 ns 2D S High t DSH 50 ns 3C S Setup t CSS 0n s 4C S Hold t CSH 0n s 5R / W Setup t RWS 15 ns 6R / W Hold t RWH 0n s

7 Address Setup t ADS 15 ns

8 Address Hold t ADH 40 ns

9 Data Delay Read t DDR 100 ns C L = 150 pF, RL = 1 kΩ

10 Data Hold Read t DHR 5n s C L = 150 pF, RL = 1 kΩ

11 Data Active to High Z Delay t DAZ 50 ns C L = 150 pF, RL = 1 kΩ,

12 Data Setup Write t DSW 15 ns

13 Data Hold Write t DHW 25 ns

14 Cycle Time t CYC 165 ns

tIRF, tORF Timing Reference Points VT VHM VLM tIRF, tORF

Zarlink Semiconductor Inc. Figure 28 - Motorola Microprocessor Timing ‡Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing. Note 1. High impedance is measured by pulling to the appropriate rail with R L, with timing corrected to cancel time taken to discharge C L. Characteristics Sym. Min. Typ. ‡ Max. Units Test Conditions 1R D low t RDL 115 ns 2R D High t RDH 50 ns 3C S Setup t CSS 0n s 4C S Hold t CSH 0n s 5W R low t WRL 70 ns 6W R High t WRH 50 ns 9 Data Delay Read t DDR 100 ns C L = 150 pF, RL = 1 kΩ.

11 Data Active to High Z Delay t DAZ 50 ns C L = 150 pF, RL = 1 kΩ, Note

14 Cycle Time t CYC 165

Note: DS and CS may be connected together. tCYC VT VT VT VT VT T MT9072 Inputs Address DS (RD) CS R/W (WR) A0-10 D0-15 READ VMT9072 InputsData D0-15 WRITE tDSW tDSH

Zarlink Semiconductor Inc. Figure 29 - Intel Microprocessor Timing Characteristic Sym. Min. Typ. Max. Units Test Conditions

1 TCK period width t TCLK 100 ns BSDL spec’s 12 MHz

2 TCK period width LOW t TCLKL 40 ns

3 TCK period width HIGH t TCLKH 40 ns

TDI setup time to TCK rising t DISU 12 TDI hold time after TCK rising t DIH 12 TMS setup time to TCK rising t MSSU 12 TMS hold time after TCK rising t MSH 12 TDO delay from TCK falling t DOD 50 TRST pulse width t TRST 25 MT9072 Outputs Data tCSS tADS tCSH tADH tDSW tDHR tDDR tDHW tRDH tRDL tDAZ tCYC VT VT VT VT VT MT9072 Inputs Address tADS tADH tWRH tWRH tCYC tCSS RD (DS) CS WR (R/W) A0-10 D0-15 READ VT MT9072 Inputs Data D0-D15 WRITE tDSW tDSH

Zarlink Semiconductor Inc. Figure 30 - JTAG Port Timing tmssu TDI TDO TMS TCK tdisu tmsh tdih tdod ttclkh ttclkl ttclk TRST ttrst

Zarlink Semiconductor Inc. Figure 31 - GCI 2.048 Mb/s Factional Timing Diagram Figure 32 - GCI 2.048 Mb/s Timing Diagram Characteristics Sym. Min. Typ. Max. Units Test Conditions 1D C L Clock Width High or Low t DCLW 100 122 144 ns

2 Frame Pulse Setup t FSCS 50 ns

3 Frame Pulse Hold t FSCH 50 ns

4 Serial Input Setup t SIS 30 ns

5 Serial Input Hold t SIH 50 ns

6 Serial Output Delay t SOD 125 ns 150 pF load on CSTo and

(GCI DCLi) FPi (GCI FSCi) Internal (ST-BUS C2) GCI Bit Cells 2M b / s MT9072 Outputs Data MT9072 Inputs Data MT9072 Inputs Data MT9072 Outputs Data Timeslot 0 Bit 7 Timeslot 31 Bit 0 VT VT tSIHtSIS VT tFSCS tFSCH tSOD tDCLW tDCLW VT CKi (GCI DCLi) FPi (GCI FSCi) GCI Bit Cells 2M b / s CSTi & DSTi (Inputs) CSTo & DSTo (Outputs)

Zarlink Semiconductor Inc. Figure 33 - ST-BUS 2.048 Mb/s Functional Timing Diagram Figure 34 - ST-BUS 2.048 Mb/s Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions 1C 2 i Clock Width High or Low t C2W 222 244 266 ns 2C 4 i Clock Width High or Low t C4W 100 122 144 ns

3 Frame Pulse Setup t FPS 50 ns

4 Frame Pulse Hold t FPH 50 ns

6 Serial Input Setup t SIS 30 ns

7 Serial Input Hold t SIH 50 ns

8 Serial Output Delay t SOD 90 125 ns 150 pF load on CSTo and

(ST-BUS C4i) FPi (ST-BUS F0i) CKi (ST-BUS C2i) ST-BUS Bit Cells 2M b / s MT9072 Outputs Data MT9072 Inputs Data MT9072 Inputs Data MT9072 Outputs Data Timeslot 0 Bit 7 Timeslot 31 Bit 0 VT VT tSIHtSIS VT tFPS tFPH tSOD tC4W tC4W VT CKi (ST-BUS C4i) FPi (ST-BUS F0i) ST-BUS Bit Cells 2M b / s CSTi & DSTi (Inputs) (With C4i Clock) CSTo & DSTo (Outputs) tC2W tC2W CKi (ST-BUS C2i) VT

Zarlink Semiconductor Inc. Figure 35 - ST-BUS 8.192 Mb/s Functional Timing Diagram Figure 36 - ST-BUS 8.192 Mb/s Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions 1C K i Clock Width High or Low t CKW 25 31 35 ns

3 Frame Pulse Setup t FPS 10 60 ns

4 Frame Pulse Hold t FPH 20 60 ns

6 Serial Input Setup t SIS 10 ns

7 Serial Input Hold t SIH 20 ns

8 Serial Output Delay t SOD 55 ns 150 pF load on CSTo and

(ST-BUS C16i) FPi (ST-BUS F16i) MT9072 Inputs Data MT9072 Inputs Data MT9072 Outputs Data MT9072 Outputs Data Timeslot 0 Bit 7 Timeslot 127 Bit 0 VT VT tSIHtSIS VT tFPS tFPH tSOD tCKW tCKW VT CKi (ST-BUS C16i) FPi (ST-BUS F16i) CSTi & DSTi (Inputs) CSTo & DSTo (Outputs) ST-BUS Bit Cells 8M b / s

Zarlink Semiconductor Inc. Figure 37 - ST-BUS 8.192 Mb/s Function al Timing Diagram for CSTo/CSTi CAS Figure 38 - ST-BUS 8.192 Mb/s Function al Timing Diagram for CSTo/CSTi CCS

19.2 T1 Mode

Characteristics Sym. Min. Typ. Max. Units Test Conditions 1 C1.5i Clock Width High or Low t C1.5W 295 324 353 ns

2 Frame Pulse Setup t FPS 50 ns

3 Frame Pulse Hold t FPH 50 ns

6 Clock output delay t cod 50 ns

7 Serial Output Delay t SOD 20 90 125 ns 150 pF load on CSTo and

(ST-BUS F16i) Channel Chan 0 Data Chan 1 Data Chan 2 Data Chan 0 Data Chan 1 Data Chan 2 Data CSTi0 CSTo0 Note: In Cas only the lower nibble of the stream is used Note: The ABCD bits are bit 3 to bit 0 respectively Timeslot 127 Bit 0 Channel Channel Channel ST-BUS Bit Cells 8M b / s FPi (ST-BUS F16i) Channel Note: In CCS the complete Byte is used in accordance with CCS Map register Y07. Any 3 CSTi/CSTo channels are CSTo0 CSTo0 CCS Chan 0 CCS Chan 1 CCS Chan 0 CCS Chan1 used

Zarlink Semiconductor Inc. Figure 39 - IMA Functional Timing Diagram Figure 40 - IMA Mode Timing Diagram Timeslot 23 Bit 0 Sbit Timeslot 0 Bit 7 Timeslot 0 Bit 6 FPi (Input) CKi ( Input)) Bit Cells

1.544 Mb/s

(Output) RXDLC Timeslot 23 Bit 0 Sbit Timeslot 0 Bit 7 Timeslot 0 Bit 6 DSTi (input) RXDLC (Output) Timeslot 23 Bit 0 Sbit Timeslot 0 Bit 7 Timeslot 0 Bit 6 DSTo (Output) MT9072 Outputs Data MT9072 Inputs Data MT9072 Inputs Data MT9072 Outputs Data SbitTimeslot 23 Bit 0 VT tSOD VT FPi Bit Cells (Outputs) tC1.5W tC1.5W CKi (C1.5i) VT tSIHtSIS VT DSTi (Inputs) (With C1.5i Clock) RXDLC (Output) VT VT RXBF tC1.5W tC1.5W tfs tfh Note: In IMA Mode The Data(DSTi) is input with respect to CKI and FPi denotes the Sbit. The DSTo is output with respect to RXDLC clock and RXBF denotes the S bit. RXDLC is the delayed version of EXCLi. EXCLi (Input) VT cod

Zarlink Semiconductor Inc. Figure 41 - Transmit Multiframe Functional Timing Figure 42 - Transmit MultiframeTiming Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Transmit Multiframe Setup t MS 50 ns

(ST-BUS F0 i or F16i) CKi (ST-BUS C4i or C16i) ST-BUS Bit Cells 2M b / s o r 8M b / s TxMF (Input) CKi (ST-BUS C2i) Bit 7Bit 0 VT VT tMS VT FPi (ST-BUS F0i or F16i) CKi (ST-BUS C4i or C16i) ST-BUS Bit Cells

2 Mb/s or 8 Mb/s

(Input) CKi (ST-BUS C2i) VT Note The TXMF must be aligned with the frame pulse for correct multiframe operation

Zarlink Semiconductor Inc. Figure 43 - Receive Multiframe Functional Timing Figure 44 - Receive Multiframe Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Receive Multiframe Output Delay t MOD 55 ns 150 pF load on RxMF

(ST-BUS F0 i or F16i) CKi (ST-BUS C4i or C16i) RxMF (Output) ST-BUS Bit Cells 2M b / s o r 8M b / sCKi (ST-BUS C2i) Bit 7Bit 0 VT VT VT tMOD tMOD FPi (ST-BUS F0i or F16i) CKi (ST-BUS C4i or C16i) RxMF (Output) ST-BUS Bit Cells

2 Mb/s or 8 Mb/sCKi

(ST-BUS C2i) VT Note: Tx8KEN is 0 RXMF shows the receive T1 multiframe

Zarlink Semiconductor Inc. Figure 45 - Receive Multiframe Timing with TX8KEn Set Functional Timing Diagram Figure 46 - Receive Multiframe Timing with TX8KEn Set Timing Diagram Characteristics Sym. Min. Typ. Max. Units Test Conditions 1R X M F Output Delay t TFOD 20 ns 150 pF Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Clock Delay t CD 100 ns 150 pF load on TxDLC

2 Enable Delay t ED 100 ns 150 pF load on TxDLC

3 Data Setup t DS 50 ns 150 pF load on TxDLC

4 Data Hold t DH 50 ns 150 pF load on TxDLC

(Tx8KEN= 1) TPOS/TNEG tSOD (Output) tTFOD tTFOD VTT VTT VTT tSOD RXMF (Input) TXCL (Output)

Zarlink Semiconductor Inc. Figure 47 - Transmit Data Link Pin Timing Figure 48 - Receive Data Link Functional Diagram Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Clock Delay t CD 100 ns 150 pF load on RxDLC

2 Enable Delay t ED 100 ns 150 pF load on RxDLC

3 Data Delay Read t DDR 100 ns 150 pF load on RxDL

4 Data Hold Read t DHR 50 ns 150 pF load on RxDL

1.5 Mb/s

1.5 Mhz Clock

(Input) VT Note 1 - TxDLC output applies for every second frame (FPi) pulse (250 us) only Note 2 - Clock output provided by setting control bit DLCK=1 (register address Y06) Note 3 - Enable output provided by clearing control bit DLCK=0 (register address Y06) Note 4- TXCL is an input 1.5 Mhz clock for the PCM24 interface Note 5- The TXDLC clock is provided one frame before it is used in ESF Mode in Frames 2 4 TxDLC - Note 3 (Output) VT VT TxDLC - Note 2 (Output) tCD tED VT tCD RXBF RxDLC RxDL

Zarlink Semiconductor Inc. Figure 49 - Receive DataLink Timing Diagram Figure 50 - Receive Basi c Frame Pulse Pin Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Basic Frame Output Delay t BD 100 ns 150 pF load on RxBF

Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Transmit Delay tTD 50 ns 150 pF load on TPOS and TNEG

2 Transmit Delay in RZ mode tr

TD 200 ns 150 pF load on TPOS and TNEG

3 Transmit Invalid in RZ Mode tr

DI 200 ns 150 pF load on TPOS and TNEG MT9072 Outputs Data tCD VT VT RxDLC - Note 2 (Output) RxDL (Output) EXCLi RXDL Timeslots VT RxDLC - Note 3 (Output) Note 1 - RxDLC output applies for every second frame (RxBF) pulse (250 us) only Note 2 - Clock output provided by setting control bit DLCK=1 (register address Y06) Note 3 - Enable output provided by clearing control bit DLCK=0 (register address Y06) S bitTimeslot 23 Bit 8 VT tDDR tED VT Timeslot23 Bit 8 S Bit VT tBD RxBF (Output) EXCLi RXDL Bit Cells

Zarlink Semiconductor Inc. Figure 51 - PCM 24 Transmit Timing MT9072 Outputs Data MT9072 Outputs Data PCM 24 Transmit Bit Cells (1.544 MHz Clock) VT TPOS or TNEG (Output) (NRZ,Clke =0) TPOS or TNEG (Output) (RZ,Clke=0) VT tTD VT trTD

3.088 MHz Clock

Note 1 in RZ Mode the data has to sampled on the falling edge of 1.544 MHz clock by an external device. Note 2 The 3.088 MHz clock is internal and is shown just for reference

Zarlink Semiconductor Inc. Figure 52 - PCM24 Transmit Functional Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Receive Setup tRS 50 ns

2 Receive Hold tRH 50 ns

(0) (1) (1)(1) TPOS (Output) (RZ Dual Rail) TNEG (Output) (RZ Dual Rail) PCM24Transmit Bit Cells (2 Mb/s) (Sample Data) TXCL (1.544 MHz Transmit Clock Input,clke=0) TPOS (Output) (NRZ Dual Rail) TNEG (Output) (NRZ Dual Rail) TPOS (Output) (NRZ Single Rail) TNEG (Output) (NRZ Dual Rail) TPOS (Output) (RZ Single Rail) TNEG (Output) (RZ Single Rail) TXCL (1.544 MHz Transmit Clock Input,clke=1 Only valid in NRZ Note: CLKE =1 is only valid in NRZ Mode

Zarlink Semiconductor Inc. Figure 53 - PCM24 Receive Functional Timing Figure 54 - PCM24 Receive Timing (0) (1) (1)(1) RPOS (Input) (RZ Dual Rail) RNEG (Input) (RZ Dual Rail) RPOS (Input) (NRZ Dual Rail) RNEG (Input) (NRZ Dual Rail) RPOS (Input) (NRZ Single Rail) RNEG (Input) (NRZ Single Rail) PCM24 Receive Bit Cells(Neg Edge) (Sample Data) EXCLi

1.5 Meg Clock

CLKE=0 EXCLi CLKE=1 MT9072 Inputs Data tRS tRH PCM 24 Receive Bit Cells (Input) (RZ or NRZ Pos Edge CLKE=0 VT EXCLi VT RPOS or RNEG (Input) (RZ or NRZ Neg Edge CLKE=1) tRS tRH MT9072 Inputs Data

Zarlink Semiconductor Inc.

19.2.1 AC Electrical Characteristics - PCM24 and ST-BUS Frame Format

In both the transmit and receive directions, PCM24 LSB maps to ST-BUS LSB. Figure 55 - PCM 24 Format Figure 56 - ST-BUS Format ‡Typical figures are at 25°C and are for design aid only: not guaranteed and not subject to production testing. Note 1. High impedance is measured by pulling to th e appropriate rail with R L, with timing corrected to cancel time taken to discharge CL. FRAME 15 0 14 15 0 timeslot 01 3 0 3 1 Most Significant Bit (First) Least Significant Bit (Last) BIT 12 34 56 7 8 FRAMEFRAMEFRAMEFRAME timeslot timeslot timeslot BIT BIT BIT BIT BIT BITBIT 2.0 ms (8/2.048) µs 125 µs

••• CHANNEL 31 or 127 0 30 or 126 BIT CHANNEL CHANNEL CHANNEL CHANNEL 31 or 127 0 BIT BIT BIT BIT BIT BIT BIT
• • Least Significant Bit (Last) Most Significant Bit (First) 125 µs 765 432 1 0

Zarlink Semiconductor Inc.

19.3 E1 Mode

Figure 57 - Receive IMA Timing Figure 58 - Receive IMA F unctional Timing Diagram Characteristics Sym. Min. Typ. Max. Units Test Conditions 1R X D L C Clock Width High or Low t E4W 25 100 ns

2 Receive Basic Frame Pulse Delay t FD 50 ns

4 RXDLC Clock Delay t CD 50 125 ns 150 pF load on CSTo and

(Outputs) tCD VT tE4HW tE4LW Rxdlc Output VT EXcli Input RXBF Output TFD Note that the Transmit IMA mode uses Fpi Cki and DSTi and timing is indentical to the 2 Mb/s ST-BUS (See Figure 33) Timeslot 31 Bit 0 Timeslot 0 Bit 7 Timeslot 0 Bit 6 Timeslot 0 Bit 5 RXDLC RXBF E2i ST-BUS Bit Cells 2M b / s

Zarlink Semiconductor Inc. Figure 59 - Transmit Multiframe (CRC-4 or CAS) Timing Figure 60 - Transmit Multiframe (CRC-4 or CAS) Functional Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions (ST-BUS F0i or F16i) CKi (ST-BUS C4i or C16i) ST-BUS Bit Cells (Input) Frame 0Frame N Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit FPi (ST-BUS F0i or F16i) CKi (ST-BUS C4i or C16i) ST-BUS Bit Cells (Input) Internal (ST-BUS C2)

Zarlink Semiconductor Inc. Figure 61 - Receive Multiframe (CRC-4 or CAS) Timing Figure 62 - Receive Multiframe (CRC-4 or CAS) Functional Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Receive Multiframe Output Delay r MOD 55 ns 150 pF load on RxMF

(ST-BUS F0i) 2M b / s CKi (ST-BUS C4i) 2M b / s RxMF (Output) ST-BUS Bit Cells 2M b / s ST-BUS Bit Cells 8M b / s CKi (ST-BUS C16 8M b / s VT VT FPi (ST-BUS F16 8M b / s Frame 0Frame 15 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit FPi (ST-BUS F0i or F16i) CKi (ST-BUS C4i or C16i) RxMF (Output) ST-BUS Bit Cells 2M b / s o r 8M b / s Internal (ST-BUS C2 or C8)

Zarlink Semiconductor Inc. Figure 65 - Transmit Data Link Pin Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Clock Delay t CD 55 ns 150 pF load on TxDLC

2 Enable Delay t ED 55 ns 150 pF load on TxDLC

3D a t a S e t u p t DS 100 ns 4D a t a H o l d t DH 50 ns MT9072 Inputs Data tDHtDS ST-BUS Bit Cells 2M b / s CKi (ST-BUS C4 2M b / s VT TxDL (Input) VT Note 1 - TxDLC output applies for every second frame (FPi) pulse (250 us) only Note 2 - Clock output provided by setting control bit DLCK=1 (register address Y08) Note 3 - Enable output provided by clearing control bit DLCK=0 (register address Y08) tEDtED TxDLC - Note 3 (Output) VT VT tCDtCD TxDLC - Note 2 (Output) ST-BUS Bit Cells 8M b / s CKi (ST-BUS C16 8M b / s VT

Zarlink Semiconductor Inc. Figure 66 - Transmit Data Link Pin Functional Timing Bit 76543210 Example A - enable output Example B - 12 kbit/s clock output Sa4 to Sa8 clocked in by MT9072 Sa4, Sa7 and Sa8 clocked in by MT9072 Timeslot 0 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Timeslot 31 Timeslot 1 Bit Sa7 Bit Sa8 Bit Sa6 Bit Sa4 Bit Sa5 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit FPi (ST-BUS F0i) CKi (ST-BUS C4i) TxDLC - Note 3 (Output) TxDL (Input) (2Mb/s) TxDLC - Note 2 (Output) ST-BUS Bit Cells 2M b / s Internal (ST-BUS C2) ST-BUS Bit Cells 8M b / s Bit 76543210 Bit 76543210 TS2 TS4TS1TS0TS127TS126TS125TS124 TS3 TS5 Bit 76543210 Bit 76543210 Bit 76543210 Bit 76543210 Bit 76543210 Bit 76543210 Bit 76543210 CKi (ST-BUS C16i) Example A - 20 kbit/s clock output Sa4 to Sa8 clocked in by MT9072 TxDLC - Note 2 (Output) Note 1 - TxDLC output applies for every second frame (FPi) pulse (250 us) only Note 2 - Clock output provided by setting control bit DLCK=1 (register address Y08) Note 3 - Enable output provided by clearing control bit DLCK=0 (register address Y08) Example B - enable output Sa4, Sa7 and Sa8 clocked in by MT9072 TxDLC - Note 3 (Output) FPi (ST-BUS F16i)

Zarlink Semiconductor Inc. Figure 67 - Receive Basic Frame and E4o Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Basic Frame Output Delay t BD 30 115 ns 150 pF load on RxBF

2 Clock Delay t CD 55 ns 150 pF load on RxDLC

3E 4 o Clock High Width t E4HW 50 200 ns 150 pF load on RxDLC 3E 4 o Clock Low Width t E4LW 25 75 ns 150 pF load on RxDLC VT Timeslot 31 Bit 8 Timeslot 0 Bit 1 VT RxBF (Output) E2i Input RXDL PCM 30 Bit Cells E4o - Note 1 (RxDLC Pin) Output t CDtCD Note 1 - The E4o signal is output at the RxDLC Pin when the E4CK control bit (address Y08) is set to one. Note 2 - The PCM Timeslots are referred to RXDL Output which is delayed 4 bits from the RPOS/RNEG input. Note3- The E4 o Clock(RXDLC Output) is not a 50% duty cycle clock, it will be low for 25 % and high for 75% of the

4.096 MHz clock

t BD

Zarlink Semiconductor Inc. Figure 68 - Receive Data Link Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Clock Delay t CD 55 ns 150 pF load on RxDLC

2 Enable Delay t ED 55 ns 150 pF load on RxDLC

3 Data Delay Read t DDR 125 ns 150 pF load on RxDL

(Output) RxDL (Output) E2i RXDL Bit Cells VT tED tED RxDLC - Note 3 (Output) Note 1 - RxDLC output applies for every second frame (RxBF) pulse (250us) only Note 2 - Clock output provided by setting control bit DLCK=1 (register address Y08) Note 3 - Enable output provided by clearing control bit DLCK=0 (register address Y08) Note 4 - The PCM 30 Timeslots are with respect to RXDL Output

Zarlink Semiconductor Inc. Figure 69 - Receive Data Link Pin Functional Timing RxBF (Output) Timeslot 0 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Timeslot 31 Timeslot 1 Bit Sa7 Bit Sa8 Bit Sa6 Bit Sa4 Bit Sa5 Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Bit Example A - 20 kbit/s clock output Example B - 12 kbit/s clock output Sa4 to Sa8 clocked in by External Device Sa4, Sa7 and Sa8 clocked in by External Device RxDLC - Note 2 (Output) RxDLC - Note 2 (Output) RxDL (Output) E2i RXDL PCM 30 Bit Cells Example B - enable output Sa4, Sa7 and Sa8 clocked in by External Device RxDLC - Note 3 (Output) RxDLC - Note 3 (Output) Example A - enable output Sa4 to Sa8 clocked in by External Device Note 1 - RxDLC output applies for every second frame (RxBF) pulse (250 us) only Note 2 - Clock output provided by setting control bit DLCK=1 (register address Y08) Note 3 - Enable output provided by clearing control bit DLCK=0 (register address Y08) Note 4 - PCM Timeslot is with reference to RXDL Output. It is delayed 4 bits from RPOS/RNEG

Zarlink Semiconductor Inc. Figure 70 - PCM 30 Transmit Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Transmit Output Clock Delay t CD 55 ns 150 pF load on T2o

2 Transmit Output Delay t TOD 55 ns 150 pF load on TPOS

(ST-BUS C16 PCM 30 Transmit Bit Cells 2M b / s CKi (ST-BUS C4i) VT TPOS or TNEG (Output) (NRZ) TPOS or TNEG (Output) (RZ) VT tTOD tTOD VT VT T2o (Output) T2OP=0 VT T2o (Output) T2OP=1 tCD tCD Note that the times specified apply to non-loopback modes

Zarlink Semiconductor Inc. Figure 71 - PCM30 Transmit Functional Timing (0) (1) (1)(1) CKi (ST-BUS C4i) TPOS (Output) (RZ Dual Rail) TNEG (Output) (RZ Dual Rail) TPOS (Output) (NRZ Dual Rail) TNEG (Output) (NRZ Dual Rail) TPOS (Output) (NRZ Single Rail) TNEG (Output) (NRZ Single Rail) PCM30 Transmit Bit Cells (2 Mb/s) (Sample Data) T2o (Output) T2OP=0 CKi (ST-BUS C16 T2o (Output) T2OP=1 Note: T2o is only applicable in the NRZ mode

Zarlink Semiconductor Inc. Figure 72 - PCM 30 Receive Timing Figure 73 - PCM30 Receive Functional Timing Characteristics Sym. Min. Typ. Max. Units Test Conditions

1 Receive Setup t RS 50 ns

2 Receive Hold t RH 50 ns

(Input) (RZ or NRZ) VT (0) (1) (1)(1) RPOS (Input) (RZ Dual Rail) RNEG (Input) (RZ Dual Rail) RPOS (Input) (NRZ Dual Rail) RNEG (Input) (NRZ Dual Rail) RPOS (Input) (NRZ Single Rail) RNEG (Input) (NRZ Single Rail) PCM30 Receive Bit Cells(Neg Edge) (Sample Data) E2i

2 Meg Clock

CLKE=0 E2i CLKE=1 ClKE selection is noly applicable for NRZ mode

Zarlink Semiconductor Inc.

19.4 AC Electrical Characteristics - PCM30 and ST-BUS Frame Format

In both the transmit and receive directions, PCM30 LSB maps to ST-BUS LSB. Figure 74 - PCM 30 Format Figure 75 - ST-BUS Format

20.0 Applicable Specifications

T1.102-1993 Digital Heirarch y_Electrical Interfaces T1.231-1993 Layer 1 In-Service Digita l Transmission Performance Monitoring T1.403-1995 Network to Customer Installation Metallic Interfaces T1.408-1990 ISDN Primary Rate- Customer Installation Metallic Interfaces TR 62411-1990 Accunet T1.5 Service Desc ription and Interface Specification TA-TSY-000278 Issue1, 1985 Digital Data Systems( DDS)- T1 Digital Multiplexor(T1DM) Requirements G.711 Pulse Code Modulation(PCM) of Voice Frequencies Table 204 - Applicable Telecommunications Specifications FRAME 15 0 14 15 0 TIMESLOT 0 1 30 31 Most Significant Bit (First) Least Significant Bit (Last) BIT 12 34 56 7 8 FRAMEFRAMEFRAMEFRAME TIMESLOT TIMESLOT TIMESLOTBIT BIT BIT BIT BIT BITBIT 2.0 ms (8/2.048) µs 125 µs

••• CHANNEL 31 or 127 0 30 or 126 BIT CHANNEL CHANNEL CHANNEL CHANNEL 31 or 127 0 BIT BIT BIT BIT BIT BIT BIT
• • Least Significant Bit (Last) Most Significant Bit (First) 125 µs 765 432 1 0

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Product Information

MT9072 specifications and overview.

Summary

Octal T1/E1/J1 Framer

Description

The MT9072 is a multi-port T1/E1/J1 framing device that integrates eight fully independent, feature rich framers. The device is software selectable between T1, E1 or J1 modes and meets the latest relevant recommendations and standards from Telcordia, ANSI, ETSI and ITU-T. An extensive suite of features make the MT9072 very flexible and suitable for a wide variety of applications around the globe.

Source title MT9072 Datasheet(PDF) - Zarlink Semiconductor Inc

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