PI7C9X110BNBE

PI7C9X110 PERICOM | Alldatasheet

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PCIe-to-PCI Reversible Bridge Page 2 of 145 Pericom Semiconductor November 2007, Revision 2.4 LIFE SUPPORT POLICY Pericom Semiconductor Corporation’s products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to such intended use is executed between the manufacturer and an officer of PSC. 1) Life support devices or system are devices or systems which: a) Are intended for surgical implant into the body or b) Support or sustain life and w hose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2) A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. Pericom Semiconductor Corporation reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply the best possible product. Pericom Semiconductor does not assume any responsibility for use of any circuitry described other than the circuitry embodied in a Pericom Semiconductor product. The Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent, patent rights or other rights, of Pericom Semiconductor Corporation. All other trademarks are of their respective companies.

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REVISION HISTORY

DATE REVISION # DESCRIPTION 09/08/2006 2.0 First release of 9X110 datasheet without revision suffix 11/21/2006 2.1 Removed references to PI7C9X110A 03/06/2007 2.2 Revised ESD ratings in “DC Specifications” section 16.2 05/02/2007 2.3 Revised table 8-1 in section 8 Address bit[5] corrected to equal 0 Address bit[4] corrected to equal GPIO[3] 11/02/2007 2.4 Revised logos a nd font types and added Industrial Temp Compliancy PREFACE The datasheet of PI7C9X110 will be enhanced periodically when updated information is available. The technical information in this datasheet is subject to change without notice. This document describes the functionalities of PI7C9X110 (PCI Express Bridge) and provides technical information for designers to design their hardware using PI7C9X110.

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7.6 CONTROL AND STATUS REGISTERS FO R NON-TRANSPARENT BRIDGE MODE

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1 INTRODUCTION

PI7C9X110 is a PCIe-to-PCI/PCI-X bridge. PI7C9X110 is compliant with the PCI Express Base Specification, Revision 1.0a, the PCI Express Card Electromechanical Specification, Revision 1.0a, the PCI Local Bus Specification, Revision 3.0 and PCI Express to PCI/PCI-X Bridge Specification, Revision 1.0. PI7C9X110 supports transparent and non-transparent mode of operations. Also, PI7C9X110B supports forward and reverse bridging. In forward bridge mode, PI7C9X110 has an x1 PCI Express upstream port and a 32-bit PCI/PCI-X downstream port. The 32-bit PCI downstream port is 66MHz capable (see figure 1-1). In reverse bridge mode, PI7C9X110 has a 32-bit PCI upstream port and an x1 PCI Express downstream port. PI7C9X110 configuration registers are backward compatible with existing PCI bridge software and firmware. No modification of PCI bridge software and firmware is needed for the original operation. Figure 1-1 PI7C9X110 Topology

1.1 PCI EXPRESS FEATURES

• Compliant with PCI Express Base Specification, Revision 1.0a
• Compliant with PCI Express Card Electromechanical Specification, Revision 1.0a
• Compliant with PCI Express to PCI/PCI-X Bridge Specification, Revision 1.0
• Physical Layer interface (x1 link with 2.5Gb/s data rate)
• Lane polarity toggle
• Virtual Isochronous support (upstream TC1-7 generation, downstream TC1-7 mapping)
• ASPM support
• Beacon support
• CRC (16-bit), LCRC (32-bit)
• ECRC and advanced error reporting
• PRBS (Pseudo Random Bit Sequencing) generator/checker for chip testing PI7C9X110 x1 PCI Express Port Tx Rx PCI 32bit / 66MHz Bus PCI Device PCI Device PCI Device PCI Device PCI Device PCI Device PCI Device PCI Device

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• Maximum payload size to 512 bytes

1.2 PCI / PCI-X FEATURES

• Compliant with PCI Local Bus Specification, Revision 3.0
• Compliant with PCI-to-PCI Bridge Architecture Specification, Revision 1.2
• Compliant with PCI Bus PM Interface Specification, Revision 1.1
• Compliant with PCI Hot-Plug Specification, Revision 1.1
• Compliant with PCI Mobile Design Guide, Version 1.1
• Compliant with PCI-X Protocol Addendum to the PCI Local Bus Specification, Revision 2.0a
• PME support
• 3.3V PCI signaling with 5V I/O tolerance
• Provides two level arbitration support for eight PCI Bus masters
• 16-bit address decode for VGA
• Subsystem Vendor and Subsystem Device IDs support
• PCI INT interrupt or MSI Function support

1.3 GENERAL FEATURES

• Compliant with Advanced Configuration and Power Interface Specification (ACPI), Revision 2.0b
• Compliant with System Management (SM) Bus, Version 2.0
• Forward bridging (PCI Express as primary bus, PCI as secondary bus)
• Reverse bridging (PCI as primary bus, PCI Express as secondary bus)
• Transparent mode support
• Non-transparent mode Support
• GPIO support (4 bi-directional pins)
• Power Management (including ACPI, CLKRUN_L, PCI_PM)
• Masquerade Mode (pre-loadable vendor, device, and revision IDs)
• EEPROM (I2C) Interface
• SM Bus Interface
• Auxiliary powers (VAUX, VDDAUX, VDDCAUX) support
• Power consumption at about 1.0 Watt in typical condition
• Extended commercial temperature range (0C to 85C)

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2 PIN DEFINITIONS

2.1 SIGNAL TYPES

TYPE OF SIGNAL - DESCRIPTIONS B Bi-directional I Input IU Input with pull-up ID Input with pull-down IOD Bi-directional with open drain output OD Open drain output O Output P Power G Ground

2.2 PCI EXPRESS SIGNALS

NAME PIN ASSIGNMENT TYPE DESCRIPTION REFCLKP REFCLKN E3, I Reference Clock Inputs: Connect to external 100MHz differential clock. RP RN G4, I PCI Express data inputs: Differential data receiver input signals TP TN G1, O PCI Express data outputs: Differential data transmitter output signals RREF H3 I Resistor Reference: It is used to connect an external resistor (2.4K Ohm +/- 1%) to VSS to provide a reference current for the driver and equalization circuit. PERST_L L3 I PCI Express Fundamental Reset: PI7C9X110B uses this reset to initialize the internal state machines.

2.3 PCI SIGNALS

NAME PIN ASSIGNMENT TYPE DESCRIPTION C5, D5, B6, A7, B7, D7, A8, C8, D8, B9, C9, C12, D14, D12, D11, E13, F14, F13, F11, G12, G11, H13, H12, J14, J13, J11, K14 B Address / Data: Multiplexed address and data bus. Address phase is aligned with first clock of FRAME_L assertion. Data phase is aligned with IRDY_L or TRDY_L assertion. Data is transferred on rising edges of FBCLKIN when both IRDY_L and TRDY_L are asserted. During bus idle (both FRAME_L and IRDY_L are de- asserted), PI7C9X110B drives AD to a valid logic level when arbiter is parking to PI7C9X110B on PCI bus. CBE [3:0] C6, A10, C14, G14 B Command / Byte Enables (Active LOW): Multiplexed command at address phase and byte enable at data phase. During address phase, the initiator drives commands on CBE [3:0] signals to start the transaction. If the command is a write transaction, the initiator will drive the byte enables during data phase. Otherwise, the target will drive the byte enables during data phase. During bus idle, PI7C9X110B drives CBE [3:0] signals to a valid logic level when arbiter is parking to PI7C9X110B on PCI bus. PAR B13 B Parity Bit: Parity bit is an even parity (i.e. even number of 1’s), which generates based on the values of AD [31:0], CBE [3:0]. If PI7C9X110B is an initiator with a write transaction, PI7C9X110B will tri-state PAR. If PI7C9X110B is a target and a write transaction, PI7C9X110B will drive PAR one clock after the address or data phase. If PI7C9X110B is a target and a read transaction, PI7C9X110B will drive PAR one clock after the address phase and tri-state PAR during data phases. PAR is tri-stated one cycle after the AD lines are tri-stated. During bus idle, PI7C9X110B drives PAR to a valid logic level when arbiter is parking to PI7C9X110B on PCI bus. FRAME_L B10 B FRAME (Active LOW): Driven by the initiator of a transaction to indicate the beginning and duration an access. The de-assertion of FRAME_L indicates the final data phase signaled by the initiator in burst transfers. Before being tri-stated, it is driven to a de-asserted state for one cycle.

PCIe-to-PCI Reversible Bridge Page 17 of 145 Pericom Semiconductor November 2007, Revision 2.4 NAME PIN ASSIGNMENT TYPE DESCRIPTION IRDY_L D10 B IRDY (Active LOW): Driven by the initiator of a transaction to indicate its ability to complete current data phase on the primary side. Once asserted in a data phase, it is not de-asserted until the end of the data phase. Before tri-stated, it is driven to a de- asserted state for one cycle. TRDY_L A11 B TRDY (Active LOW): Driven by the target of a transaction to indicate its ability to complete current data phase on the primary side. Once asserted in a data phase, it is not de-asserted until the end of the data phase. Before tri-stated, it is driven to a de- asserted state for one cycle. DEVSEL_L B11 B Device Select (Active LOW): Asserted by the target indicating that the device is accepting the transaction. As a master, PI7C9X110 waits for the assertion of this signal within 5 cycles of FRAME_L assertion; otherwise, terminate with master abort. Before tri-stated, it is driven to a de-asserted state for one cycle. STOP_L A12 B STOP (Active LOW): Asserted by the target indicating that the target is requesting the initiator to stop the current transaction. Before tri-stated, it is driven to a de- asserted state for one cycle. LOCK_L A13 B LOCK (Active LOW): Asserted by the initiator for multiple transactions to complete. PI7C9X110B does not support any upstream LOCK transaction. IDSEL N14 I Initialization Device Select: Used as a chip select line for Type 0 configuration access to bridge’s configuration space. PERR_L A14 B Parity Error (Active LOW): Asserted when a data parity error is detected for data received on the PCI bus interface. Before being tri-stated, it is driven to a de-asserted state for one cycle. SERR_L B14 IOD System Error (Active LOW): Can be driven LOW by any device to indicate a system error condition. If SERR control is enabled, PI7C9X110B will drive this pin on: ƒ Address parity error ƒ Posted write data parity error on target bus ƒ Master abort during posted write transaction ƒ Target abort during posted write transaction ƒ Posted write transaction discarded ƒ Delayed write request discarded ƒ Delayed read request discarded ƒ Delayed transaction master timeout ƒ Errors reported from PCI Express port (advanced error reporting) in transparent mode. This signal is an open drain buffer that requires an external pull-up resistor for proper operation. REQ_L [7:0] P2, P1, N3, N2, N1, M3, M2, M1 I Request (Active LOW): REQ_L’s are asserted by bus master devices to request for transactions on the PCI bus. The master devices de-assert REQ_Ls for at least 2 PCI clock cycles before asserting them again. If external arbiter is selected (CFN_L=1), REQ_L [0] will be the bus grant input to PI7C9X110. Also, REQ_L [5:2] will become the GPI [3:0]. GNT_L [7:0] N6, P6, P5, N5, M5, L5, N4, M4 O Grant (Active LOW): PI7C9X110 asserts GNT_Ls to release PCI bus control to bus master devices. During idle and all GNT_Ls are de-asserted and arbiter is parking to PI7C9X110, PI7C9X110 will drive AD, CBE, and PAR to valid logic levels. If external arbiter is selected (CFN_L=1), GNT_L [0] will be the bus request from PI7C9X110 to external arbiter. Also, GNT_L [5:2] will become the GPO [3:0]. CLKOUT [8:0] N12, P12, N11, L10, M10, P10, L9, N9, P9 O PCI Clock Outputs: PCI clock outputs are derived from the CLKIN and provide clocking signals to external PCI Devices. RESET_L N7 B RESET_L (Active LOW): When RESET_L active, all PCI signals should be asynchronously tri-stated. INTA_L INTB_L INTC_L INTD_L P13 N13 IOD Interrupt: Signals are asserted to request an interrupt. After asserted, it can be cleared by the device driver. INTA_L, INTB_L, INTC_L, INTD_L signals are inputs and asynchronous to the clock in the forward mode. In reverse mode, INTA_L, INTB_L, INTC_L, and INTD_L are open drain buffers for sending interrupts to the host interrupt controller. FBCLKIN C2 I Feedback Clock Input: It connects to one of the CLKOUT [8:0] Output Signals and provides internal clocking to PI7C9X110 PCI bus interface. CLKIN P7 I PCI Clock Input: PCI Clock Input Signal connects to an external clock source. The PCI Clock Outputs CLKOUT [8:0] pins are derived from CLKIN Input.

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2.4 MODE SELECT AND STRAPPING SIGNALS

NAME PIN ASSIGNMENT TYPE DESCRIPTION TM2 K3 I Mode Select 2: TM2 is a strapping pin. When TM2 is strapped low for normal operations and strapped high for testing functions. See table 3-1 for mode selection and 3-2 for strapping control for details. TM1 C1 I Mode Select 1: Mode Selection Pin to select EEPROM or SM Bus. TM1=0 for EEPROM (I2C) support and TM1=1 for SM Bus support. TM1 is also a strapping pin. See table 3-1 mode selection and 3-2 for strapping control. TM0 D1 I Mode Select 0: Mode Selection Pin to select transparent or non-transparent mode. TM0=0 for transparent bridge function mode and TM0=1 for non-transparent bridge function mode. TM0 is also a strapping pin. See table 3-1 for mode selection and 3-2 for strapping control. MSK_IN P14 I Mask Input for CLKOUT: MSK_IN is used by PI7C9X110 to enable or disable the clock outputs. MSK_IN is also a strapping pin. When it is strapped to high, hot-plug is enabled. See table 3-2 for strapping control. REVRSB M12 I Forward or Reverse Bridging Pin: REVRSB pin controls the Forward (REVRSB=0) or Reverse (REVRSB=1) Bridge Mode of PI7C9X110. This pin is also a strapping pin. See table 3-1 for mode selection. CFN_L M7 ID Bus Central Function Control Pin (Active Low): To enable the internal arbiter, CFN_L pin should be tied low. When it’s tied high, an external arbiter is required to arbitrate the bus. In external arbiter mode, REQ_L [0] is re-configured to be the secondary bus grant input, and GNT_L [0] is reconfigured to be the secondary bus request output. Also, REQ_L [5:2] and GNT_L [5:2] become GPI [3:0] and GPO [3:0] respectively if external arbiter is selected. CFN_L has a weak internal pull-down resistor. See table 3-1 for mode selection.

2.5 JTAG BOUNDARY SCAN SIGNALS

NAME PIN ASSIGNMENT TYPE DESCRIPTION TCK L14 IU Test Clock: TCK is the test clock to synchronize the state information and data on the PCI bus side of PI7C9X110 during boundary scan operation. TMS L13 IU Test Mode Select: TMS controls the state of the Test Access Port (TAP) controller. TDO M13 O Test Data Output: TDO is the test data output and connects to the end of the JTAG scan chain. TDI M14 IU Test Data Input: TDI is the test data input and connects to the beginning of the JTAG scan chain. It allows the test instructions and data to be serially shifted into the PCI side of PI7C9X110. TRST_L K11 IU Test Reset (Active LOW): TRST_L is the test reset to initialize the Test Access Port (TAP) controller.

2.6 MISCELLANEOUS SIGNALS

NAME PIN ASSIGNMENT TYPE DESCRIPTION GPIO [3:0] L7, P8, M8, L8 B General Purpose I/O Data Pins: The 4 general-purpose signals are programmable as either input-only or bi-directional signals by writing the GPIO output enable control register in the configuration space. See Chapter 8 for more information. SMBCLK / SCL A2 B SMBUS / EEPROM Clock Pin: When EEPROM (I2C) interface is selected (TM1=0), this pin is an output of SCL clock and connected to EEPROM clock input. When SMBUS interface is selected (TM1=1), this pin is an input for the clock of SMBUS. SMBDATA / SDA A1 B/IOD SMBUS / EEPROM Data Pin: Data Interface Pin to EERPOM or SMBUS. When EEPROM (I2C) interface is selected (TM1=0), this pin is a bi-directional signal. When SMBUS interface is selected (TM1=1), this pin is an open drain signal. PME_L A3 B Power Management Event Pin: Power Management Event Signal is asserted to request a change in the device or link power state. CLKRUN_L D3 B Clock Run Pin (Active LOW): The Clock Run signal, for mobile environment, is asserted and de-asserted to indicate the status of the PCI Clock.

PCIe-to-PCI Reversible Bridge Page 19 of 145 Pericom Semiconductor November 2007, Revision 2.4 NAME PIN ASSIGNMENT TYPE DESCRIPTION PCIXCAP B1 I PCI-X Capability Pin: PI7C9X110 can be forced to PCI mode if PCIXCAP is tied to ground with a capacitor (0.1uF) in parallel. If PCIXCAP is connected to ground through a capacitor (0.1uF), PI7C9X110 will be in 133MHz PCI-X mode. If PCIXCAP is connected to ground through a resistor (10K Ohm) with a capacitor (0.1uF) in parallel, PI7C9X110 will be in 66MHz PCI-X mode. PCIXUP D2 O PCIXCAP Pull-up driver: PI7C9X110 drives this pin for PCI-X mode detection.

2.7 POWER AND GROUND PINS

NAME PIN ASSIGNMENT TYPE DESCRIPTION VDDA J3, G3 P Analog Voltage Supply for PCI Express Interface: Connect to the 1.8V Power Supply. VDDP F3, F4, K2 P Digital Voltage Supply for PCI Express Interface: Connect to the 1.8V Power Supply. VDDAUX F2 P Auxiliary Voltage Supply for PCI Express Interface: Connect to the 1.8V Power Supply. VTT G2, K1 P Termination Supply Voltage for PCI Express Interface: Connect to the 1.8V Power Supply. VDDA_PLL J4 P Analog Voltage Supply for PLL at PCI Interface: Connect to the 1.8V Power Supply. VDDC L1, N8, L11, L12, B12, C10, E4 P Core Supply Voltage: Connect to the 1.8V Power Supply. VDDCAUX L2 P Auxiliary Core Supply Voltage: Connect to the 1.8V Power Supply. VD33 L4, N10, M11, K12, J12, H14, F12, E11, D13, A9, C7, A6, C4 P I/O Supply Voltage for PCI Interface: Connect to the 3.3V Power Supply for PCI I/O Buffers. VAUX B2 P Auxiliary I/O Supply Voltage for PCI interface: Connect to the 3.3V Power Supply. VSS E1, H1, H2, J2, J1, K4, P4, L6, M9, P11, K13, H11, G13, E12, E14, C13, C11, D9, B8, D6, B5, C3 P Ground: Connect to Ground. VDDA J3, G3 P Analog Voltage Supply for PCI Express Interface: Connect to the 1.8V Power Supply.

2.8 PIN ASSIGNMENTS

PIN NAME PIN NAME PIN NAME PIN NAME A1 SMBDAT / SDA C13 VSS H1 VSS M3 REQ_L[2]/GPI[0] A2 SMBCLK / SCL C14 CBE [1] H2 VSS M4 GNT_L [0] A3 PME_L D1 TM0 H3 RREF M5 GNT_L[3]/GPO[1] A4 AD [30] D2 PCIXUP H4 RN M6 INTB_L A5 AD [27] D3 CLKRUN_L H11 VSS M7 CFN_L A6 VD33 D4 AD [28] H12 AD [4] M8 GPIO [1] A7 AD [23] D5 AD [25] H13 AD [5] M9 VSS A8 AD [20] D6 VSS H14 VD33 M10 CLKOUT [4] A9 VD33 D7 AD [21] J1 VSS M11 VD33 A10 CBE [2] D8 AD [18] J2 VSS M12 REVRSB A11 TRDY_L D9 VSS J3 VDDA M13 TDO A12 STOP_L D10 IRDY_L J4 VDDA_PLL M14 TDI A13 LOCK_L D11 AD [12] J11 AD [1] N1 REQ_L[3] / GPI[1] A14 PERR_L D12 AD [13] J12 VD33 N2 REQ_L[4] / GPI[2] B1 PCIXCAP D13 VD33 J13 AD [2] N3 REQ_L[5] / GPI[3] B2 VAUX D14 AD [14] J14 AD [3] N4 GNT_L [1] B3 AD [31] E1 VSS K1 VTT N5 GNT_L[4]/GPO[2] B4 AD [29] E2 REFCLKN K2 VDDP N6 GNT_L [7] B5 VSS E3 REFCLKP K3 TM2 N7 RESET_L

PCIe-to-PCI Reversible Bridge Page 20 of 145 Pericom Semiconductor November 2007, Revision 2.4 PIN NAME PIN NAME PIN NAME PIN NAME B6 AD [24] E4 VDDC K4 VSS N8 VDDC B7 AD [22] E11 VD33 K11 TRST_L N9 CLKOUT [1] B8 VSS E12 VSS K12 VD33 N10 VD33 B9 AD [17] E13 AD [11] K13 VSS N11 CLKOUT [6] B10 FRAME_L E14 VSS K14 AD [0] N12 CLKOUT [8] B11 DEVSEL_L F1 TN L1 VDDC N13 INTD_L B12 VDDC F2 VDDAUX L2 VDDCAUX N14 IDSEL B13 PAR F3 VDDP L3 PERST_L P1 REQ_L [6] B14 SERR_L F4 VDDP L4 VD33 P2 REQ_L [7] C1 TM1 F11 AD [8] L5 GNT_L[2]/GPO[0] P3 INTA_L C2 FBCLKIN F12 VD33 L6 VSS P4 VSS C3 VSS F13 AD [9] L7 GPIO [3] P5 GNT_L[5]/GPO[3] C4 VD33 F14 AD [10] L8 GPIO [0] P6 GNT_L [6] C5 AD [26] G1 TP L9 CLKOUT [2] P7 CLKIN C6 CBE [3] G2 VTT L10 CLKOUT [5] P8 GPIO [2] C7 VD33 G3 VDDA L11 VDDC P9 CLKOUT [0] C8 AD [19] G4 RP L12 VDDC P10 CLKOUT [3] C9 AD [16] G11 AD [6] L13 TMS P11 VSS C10 VDDC G12 AD [7] L14 TCK P12 CLKKOUT [7] C11 VSS G13 VSS M1 REQ_L [0] P13 INTC_L C12 AD [15] G14 CBE [0] M2 REQ_L [1] P14 MSK_IN

3 MODE SELECTION AND PIN STRAPPING

3.1 FUNCTIONAL MODE SELECTION

If TM2 is strapped to low, PI7C9X110 uses TM1, TM0, CFN_L, and REVRSB pins to select different modes of operations. These four input signals are required to be stable during normal operation. One of the sixteen combinations of normal operation can be selected by setting the logic values for the four mode select pins. For example, if the logic values are low for all four (TM1, TM0, CFN_L, and REVRSB) pins, the normal operation will have EEPROM (I2C) support in transparent mode with internal arbiter in forward bridge mode. The designated operation with respect to the values of the TM1, TM0, CFN_L, and REVRSB pins are defined on Table 3-1: Table 3-1 Mode Selection TM2 Strapped TM1 TM0 CFN_L REVRSB Functional Mode 0 0 X X X EEPROM (I2C) support 0 1 X X X SM Bus support

0 X 0 X X Transparent mode

0 X 1 X X Non-Transparent mode

0 X X 0 X Internal arbiter

0 X X 1 X External arbiter

0 X X X 0 Forward bridge mode

0 X X X 1 Reverse bridge mode

3.2 PCI / PCI-X SELECTION

The secondary interface is capable of operating in either conventional PCI mode or in PCI-X mode. PI7C9X110 controls the mode and frequency for the secondary bus by utilizing a pull-up circuit connected to PCIXCAP. There are two pull-up resistors in the circuit as recommended by the PCI-X addendum. The first resistor is a weak pull-up (56K ohms) whose value is selected to set the voltage of PCIXCAP below its low threshold when a PCI-X 66MHz device is attached to the secondary bus. The second resistor is a strong pull-up, externally wired between PCIXCAP and PCIXUP. The value of the resistor (1K ohm) is selected to set the voltage of PCIXCAP above its high threshold when all devices on the secondary are PCI-X 66MHz capable. To detect the mode and frequency of the secondary bus, PCIXUP is initially disabled and PI7C9X110 samples the value on PCIXCAP.

PCIe-to-PCI Reversible Bridge Page 21 of 145 Pericom Semiconductor November 2007, Revision 2.4 If PI7C9X110 sees a logic LOW on PCIXCAP, one or more devices on the secondary have either pulled the signal to ground (PCI-X 66MHz capable) or tied it to ground (only capable of conventional PCI mode). To differentiate between the two conditions, PI7C9X110 then enables PCIXUP to put the strong pull-up into the circuit node. If PCIXCAP remains at logic LOW, it must be tied to ground by one or more devices, and the bus is initialized to conventional PCI mode. If PCIXUP can be pulled up, one or more devices are capable of only PCI-X 66MHz operation so the bus is initialized to PCI-X 66MHz mode. If PI7C9X110 sees logic HIGH on PCIXCAP, then all devices on the secondary bus are capable of PCI-X 100MHz or 133MHz operation. Since PI7C9X110 does not have a pin to distinguish between the 100MHz or 133MHz clock frequencies, its logic is based on 133MHz. The secondary bus is initialized to PCI-X 133MHz mode. However, 100MHz clock can still be used if all the devices on the PCI-X bus are 100MHz capable and the clock input (pin CLKIN) is set at 100MHz frequency. There is no pin for M66EN for the secondary interface of PI7C9X110 because the internal PLL is bypassed in conventional PCI mode. CLKIN is used directly, eliminating the need to distinguish between conventional PCI 33MHz and 66MHz. Figure 3-1 PCI / PCI-X Selection

3.3 PIN STRAPPING

If TM2 is strapped to high, PI7C9X110 uses TM1, TM0, and MSK_IN as strapping pins. The strapping functions are listed in Table 3-2 to show the states of operations during the PCI Express PERST_L de-assertion transition in forward bridge mode or PCI RESET_L de-assertion transition in reverse bridge mode. Table 3-2 Pin Strapping TM2 Strapped TM1 Strapped TM0 Strapped MSK_IN Strapped Test Functions PI7C9X110 PCIXCAP Enable During Bus Capability Determination 3.3v PCIXUP 3.3v 56K Ohms Weak Pull-up PCI-X 100MHz or 133MHz Card 0.01uF PCI Card 0.01uF PCI-X 66MHz Card 10K Ohms 0.01uF Strong Pull-up Ohms

PCIe-to-PCI Reversible Bridge Page 22 of 145 Pericom Semiconductor November 2007, Revision 2.4 TM2 Strapped TM1 Strapped TM0 Strapped MSK_IN Strapped Test Functions 1 0 0 1 PLL test 1 0 1 1 Shorten initialization test with hot- plug enabled 1 1 0 1 Functional loopback test 1 1 1 1 Bridge test (PRBS, IDDQ, etc.) 1 0 0 0 Reserved 1 0 1 0 Shorten initialization test with hot- plug disabled 1 1 0 0 Reserved 1 1 1 0 Reserved

4 FORWARD AND REVERSE BRIDGING

PI7C9X110 supports forward or reverse and transparent or non-transparent combination modes of operation. For example, when PI7C9X110 is operating in forward (REVRSB=0) and non-transparent bridge mode (TM0=1) shown in Figure 4-1, its PCI Express interface is connected to a root complex and its PCI bus interface is connected to PCI devices. Another example, PI7C9X110 can be configured as a reverse (REVRSB=1) and transparent (TM0=0) bridge shown in Figure 4-2. The non-transparent bridge feature of PI7C9X110 allows the I/O Processor to be isolated from the Host Processor and its memory map which avoiding memory address conflict when both host and I/O processors are needed side- by-side. PCI based systems and peripherals are ubiquitous in the I/O interconnect technology market today. It will be a tremendous effort to convert existing PCI based products to be used in PCI Express systems. PI7C9X110 provides a solution to bridge existing PCI based products to the latest PCI Express technology. Figure 4-1 Forward and Non-transparent Bridge Mode PI7C9X110 Fibre Channel Root Complex Fast Ethernet SCSI Host Processor System Memory Local Processor Local Memory x1 link

PCIe-to-PCI Reversible Bridge Page 23 of 145 Pericom Semiconductor November 2007, Revision 2.4 In reverse (REVRSB=1) and transparent (TM0=0) mode shown in Figure 3-2, PI7C9X110 becomes a PCI-to-PCI Express bridge that its PCI bus interface is connected to the host chipset between and the PCI Express x1 link. It enables the legacy PCI Host Systems to provide PCI Express capability. PI7C9X110 provides a solution to convert existing PCI based designs to adapt quickly into PCI Express base platforms. Existing PCI based applications will not have to undergo a complete re-architecture in order to interface to PCI Express technology. Figure 4-2 Reverse and Transparent Bridge Mode PI7C9X110 Fibre Channel Chipset Fast Ethernet SCSI Host Processor System Memory 32bit / 66MHz 32bit / 66MHz x1 link

PCIe-to-PCI Reversible Bridge Page 24 of 145 Pericom Semiconductor November 2007, Revision 2.4

5 TRANSPARENT AND NON- TRANSPARENT BRIDGING

5.1 TRANSPARENT MODE

In transparent bridge mode, base class code of PI7C9X110 is set to be 06h (bridge device). The sub-class code is set to be 04h (PCI-to-PCI bridge). Programming interface is 00h. Hence, PI7C9X110 is not a subtractive decoding bridge. PI7C9X110 has type-1 configuration header if TM0 is set to 0 (transparent bridge mode). These configuration registers are the same as traditional transparent PCI-to-PCI Bridge. In fact, it is backward compatible to the software that supporting traditional transparent PCI-to-PCI bridges. Configuration registers can be accessed from several different ways. For PCI Express access, PCI Express configuration transaction is in forward bridge mode. For PCI access, PCI configuration cycle is mainly in reverse bridge mode. However, PI7C9X110 allows PCI configuration access in forward mode as secondary bus configuration access. For I2C access, I2C bus protocol is used with EEPROM selected (TM1=0). For SM bus access, SM bus protocol is used with SM bus selected (TM1=1).

5.2 NON-TRANSPARENT MODE

In non-transparent bridge mode, base class code of PI7C9X110 is set to be 06h (bridge device). The sub-class code is set to be 80h (other bridge). Programming interface is 00h. Hence, PI7C9X110 is not a subtractive decoding bridge. PI7C9X110 has type-0 configuration header if TM0 is set to 1 (non-transparent mode). The configuration registers are similar to a traditional PCI device. However, there is one set of configuration registers for the primary interface and another set of configuration registers for the secondary interface. In addition, CSRs (Control and Status Registers) are implemented to support the memory or IO transfers between the primary and secondary buses. The CSRs are accessed through memory transaction access within the lowest memory range of 4K Space (bit [64:12] are zeros). The non-transparent configuration registers can be accessed through several different ways (PCI Express, PCI, I2C, and SM bus). For PCI Express and PCI access, the type-0 configuration transactions need to be used. For I2C access, I2C bus protocol needs to be used through I2C bus interface. For SM bus access, SM bus protocol needs to be used through SM bus interface. The hardware pins (A2 and A1) are shared for I2C and SM bus interface. If TM1=0, pin A2 and A1 will be SCL and SDA for I2C interface respectively. If TM1=1, pin A2 and A1 will be SMBCLK and SMBDATA for SM Bus interface respectively. In non-transparent bridge mode, PI7C9X110 supports four or three memory BARs (Base Address Registers) and one or two IO BARs (Base Address Registers) depending on selection on the primary bus. Also, PI7C9X110 supports four or three memory BARs (Base Address Registers) and one or two IO BARs (Base Address Registers) depending on selection on the secondary bus. Offset 10h is defined to be primary CSR and downstream memory 0 BAR. Offset 14h is defined to be primary CSR and downstream IO BAR. Offset 18h is defined to be downstream memory 1 or IO BAR (selectable by CSR setup register). Offset 1Ch is defined to be downstream memory 2 BAR. Offset 20h and 24h are defined to be downstream memory 3 lower BAR and memory 3 upper BAR respectively to support 64-bit decoding. The direct offset translation of address from primary to secondary bus will be done by substituting the original Base Address at primary with the downstream Translation Base Address Register values and keeping the lower address bits the same to form a new address for forward the transaction to secondary bus. For downstream memory 2, it uses direct address translation. There is no lookup table for downstream memory address translation.

PCIe-to-PCI Reversible Bridge Page 25 of 145 Pericom Semiconductor November 2007, Revision 2.4 Offset 50h is defined to be secondary CSR and upstream memory 0 BAR. Offset 54h is defined to be secondary CSR and upstream IO BAR. Offset 58h is defined to be upstream memory 1 or IO BAR (selectable by CSR setup register offset E4h). Offset 1Ch is defined to be upstream memory 2 BAR. Offset 60h and 64h are defined to be upstream memory 3 lower BAR and memory 3 upper BAR respectively to support 64-bit decoding. The direct offset translation of address from secondary to primary bus will be done by substituting the original Base Address at secondary with the upstream Translation Base Address Register values and keeping the lower address bits the same to form a new address for forward the transaction to primary bus. For upstream memory 2, it uses lookup table address translation method which using the original base address as index to select a new address on the upstream memory 2 lookup table based on the page and window size defined. Table 5-1 Non-transparent Registers Non-transparent Registers Typical access Primary CSR and Memory 0 BAR Configuration access offset 10h Downstream Memory 0 Translated Base Configuration access offset 98h Downstream Memory 0 Setup Configuration access offset 9Ch Downstream I/O or Memory 1 BAR Configuration access offset 18h Downstream I/O or Memory 1 Translated Base Configuration access offset A8h Downstream I/O or Memory 1 Setup Configuration access offset ACh Downstream Memory 2 BAR Configuration access offset 1Fh Downstream Memory 2 Translated Base Lower 4K I/O or Memory access offset 008h Downstream Memory 2 Setup Lower 4K I/O or Memory access offset 00Ch Downstream Memory 3 BAR Configuration access offset 23h Downstream Memory 3 Upper 32-bit BAR Configuration access offset 27h Downstream Memory 3 Translated Base Lower 4K I/O or Memory access offset 010h Downstream Memory 3 Setup Lower 4K I/O or Memory access offset 014h Downstream Memory 3 Upper 32-bit Setup Lower 4K I/O or Memory access offset 018h Secondary CSR Memory 0 BAR Configuration access offset 50h Upstream Memory 0 Translated Base Configuration access offset E0h Upstream Memory 0 Setup Configuration access offset E4h Secondary CSR I/O BAR Configuration access offset 54h Upstream I/O or Memory 1 BAR Configuration access offset 58h Upstream I/O or Memory 1 Translated Base Configuration access offset E8h Upstream I/O or Memory 1 Setup Configuration access offset ECh Upstream Memory 2 BAR Configuration access offset 5Fh Upstream Memory 2 Lookup Table Offset Lo wer 4K I/O or Memory access offset 050h Upstream Memory 2 Lookup Table Data Lower 4K I/O or Memory access offset 054h Upstream Memory 2 Lookup Table (64 32-bit entries) Lower 4K I/O or Memory access offset 100h to 1FFh Upstream Memory 3 BAR Configuration access offset 63h Upstream Memory 3 Upper 32-bit BAR Configuration access offset 67h Upstream Memory 3 Setup Lower 4K I/O or Memory access offset 34h Upstream Memory 3 Upper 32-bit Setup Lower 4K I/O or Memory access offset 38h

PCIe-to-PCI Reversible Bridge Page 26 of 145 Pericom Semiconductor November 2007, Revision 2.4

6 PCI EXPRESS FUNCTIONAL OVERVIEW

6.1 TLP STRUCTURE

PCI Express TLP (Transaction Layer Packet) Structure is comprised of format, type, traffic class, attributes, TLP digest, TLP poison, and length of data payload. There are four TLP formats defined in PI7C9X110 based on the states of FMT [1] and FMT [0] as shown on Table 6-1. Table 6-1 TLP Format FMT [1] FMT [0] TLP Format 0 0 3 double word, without data 0 1 4 double word, without data 1 0 3 double word, with data 1 1 4 double word, with data Data payload of PI7C9X110 can range from 4 (1DW) to 256 (64DW) bytes. PI7C9X110 supports three TLP routing mechanisms. They are comprised of Address, ID, and Implicit routings. Address routing is being used for Memory and IO requests. ID based (bus, device, function numbers) routing is being used for configuration requests. Implicit routing is being used for message routing. There are two message groups (baseline and advanced switching). The baseline message group contains INTx interrupt signaling, power management, error signaling, locked transaction support, slot power limit support, vendor defined messages, hot-plug signaling. The other is advanced switching support message group. The advanced switching support message contains data packet and signal packet messages. Advanced switching is beyond the scope of PI7C9X110 implementation. The r [2:0] values of the "type" field will determine the destination of the message to be routed. All baseline messages must use the default traffic class zero (TC0).

6.2 VIRTUAL ISOCHRONOUS OPERATION

This section provides a summary of Virtual Isochronous Operation supported by PI7C9X110. Virtual Isochronous support is disabled by default. Virtual Isochronous feature can be turned on with setting bit [26] of offset 40h to one. Control bits are designated for selecting which traffic class (TC1-7) to be used for upstream (PCI Express-to- PCI). PI7C9X110 accepts only TC0 packets of configuration, IO, and message packets for downstream (PCI Express-to-PCI). If configuration, IO and message packets have traffic class other than TC0, PI7C9X110 will treat them as malformed packets. PI7C9X110 maps all downstream memory packets from PCI Express to PCI transactions regardless the virtual Isochronous operation is enabled or not.

7 CONFIGURATION REGISTERS

PI7C9X110 supports Type-0 (non-transparent bridge mode) and Type-1 (transparent bridge mode) configuration space headers and Capability ID of 01h (PCI power management) to 10h (PCI Express capability structure). With pin REVRSB = 0, device-port type (bit [7:4]) of capability register will be set to 7h (PCI Express-to-PCI/PIC- X bridge). When pin REVRSB = 1, device-port type (bit [7:4]) of capability register will be set to 8h (PCI/PCI-X- to-PCI Express bridge). PI7C9X110 supports PCI Express capabilities register structure with capability version set to 1h (bit [3:0] of offset 02h).

PCIe-to-PCI Reversible Bridge Page 27 of 145 Pericom Semiconductor November 2007, Revision 2.4 When pin TM0=0, PI7C9X110 will be in transparent bridge mode and the configuration registers for transparent bridge should be used. When pin TM0=1, PI7C9X110 will be in non-transparent bridge mode and the configuration registers for non- transparent bridge should be used.

7.1 CONFIGURATION REGISTER MAP

PI7C9X110 supports capability pointer with PCI-X (ID=07h), PCI power management (ID=01h), PCI bridge sub- system vendor ID (ID=0Dh), PCI Express (ID=10h), vital product data (ID=03h), and message signaled interrupt (ID=05h). Slot identification (ID=04h) is off by default and can be turned on through configuration programming. Table 7-1 Configuration Register Map (00h – FFh) Primary Bus Configuration Access for both Transparent and Non-Transparent mode, or Secondary Bus Configuration Access for Transparent Mode Secondary Bus Configuration Access for Non-Transparent Mode Only Transparent Mode (type1) Non-Transparent Mode (Type0) EEPROM (I2C) Access SM Bus Access 01h - 00h 01h – 00h Vendor ID Vendor ID Yes1 Yes5 03h – 02h 03h – 02h Device ID Device ID Yes1 Yes5 05h – 04h 45h – 44h Command Register Primary Command Register No Yes 07h – 06h 47h – 46h Primary Status Register Primary Status Register No Yes 0Bh – 08h 0Bh – 08h Class Code and Revision ID Class Code and Revision ID Yes1 Yes5 0Ch 4Ch Cacheline Size Register Primary Cacheline Size Register - - 0Dh 4Dh Primary Latency Timer Primary Latency Timer No Yes 0Eh 4Eh Header Type Register Header Type Register No Yes 0Fh 4Fh Reserved Reserved - - 13h – 10h 53h – 50h Reserved Primary CSR and Memory 0 BAR No Yes 17h – 14h 57h – 54h Reserved Primary CSR I/O BAR No Yes 18h 58h Primary Bus Number Register Downstream I/O or Memory 1 BAR No Yes 19h 59h Secondary Bus Number Register Downstream I/O or Memory 1 BAR No Yes 1Ah 5Ah Subordinate Bus Number Register Downstream I/O or Memory 1 BAR No Yes 1Bh 5Bh Secondary Latency Timer Downstream I/O or Memory 1 BAR No Yes 1Ch 5Ch I/O Base Register Downstream Memory

2 BAR

1Dh 5Dh I/O Limit Register Downstream Memory 1Fh – 1Eh 5Fh – 5Eh Secondary Status Register Downstream Memory 21h – 20h 61h – 60h Memory Base Register Downstream Memory

3 BAR

23h – 22h 63h – 62h Memory Limit Register Downstream Memory 25h – 24h 65h – 64h Prefetchable Memory Base Register Downstream Memory

3 Upper 32-bit BAR

PCIe-to-PCI Reversible Bridge Page 28 of 145 Pericom Semiconductor November 2007, Revision 2.4 Primary Bus Configuration Access for both Transparent and Non-Transparent mode, or Secondary Bus Configuration Access for Transparent Mode Secondary Bus Configuration Access for Non-Transparent Mode Only Transparent Mode (type1) Non-Transparent Mode (Type0) EEPROM (I2C) Access SM Bus Access 27h – 26h 67h - 66h Prefetchable Memory Limit Register Downstream Memory 2Bh – 28h 2Bh – 28h Prefetchable Memory Base Upper 32-bit Register No Yes 2Dh – 2Ch 2Dh – 2Ch Prefetchable Memory Limit Upper 32-bit Register Subsystem Vendor ID Yes2 Yes5 2Fh – 2Eh 2Fh – 2Eh Prefetchable Memory Limit Upper 32-bit Register Subsystem ID Yes2 Yes5 31h – 30h 31h – 30h I/O Base Upper 16-bit Register Reserved No Yes 33h – 32h 33h – 32h I/O Limit Upper 16-bit Register Reserved No Yes 34h 34h Capability Pointer Capability Pointer No Yes 37h – 35h 37h – 35h Reserved Reserved No Yes 3Bh – 38h 3Bh – 38h Reserved Reserved No Yes 3Ch 7Ch Interrupt Line Primary Interrupt Line No Yes 3Dh 7Dh Interrupt Pin Prim ary Interrupt Pin No Yes 3Eh 7Eh Bridge Control Primary Min_Gnt Yes 3 Yes 3 3Fh 7Fh Bridge Control Primary Max_Lat Yes 3 Yes 3 41h – 40h 41h – 40h PCI Data Buffering Control PCI Data Buffering Control Yes Yes 43h – 42h 43h – 42h Chip Control 0 Chip Control 0 Yes Yes 45h – 44h 05h – 04h Reserved Secondary Command Register No Yes 47h – 46h 07h – 06h Reserved Secondary Status Register No Yes 4Bh – 48h 4Bh – 48h Arbiter Mode, Enable, Priority Arbiter Mode, Enable, Priority Yes Yes 4Ch 0Ch Reserved Secondary Cacheline Size Register No Yes 4Dh 0Dh Reserved Secondary Status Register No Yes 4Eh 0Eh Reserved Header Type No Yes 4Fh 0Fh Reserved Reserved - - 53h – 50h 13h – 10h Reserved Secondary CSR and Memory 0 BAR No Yes 57h – 54h 17h – 14h Reserved Secondary CSR I/O BAR No Yes 5Bh – 58h 1Bh – 18h Reserved Upstream I/O or Memory 1 BAR No Yes 5Fh – 5Ch 1Fh – 1Ch Reserved Upstream Memory 2 BAR No Yes 63h – 60h 23h – 20h Reserved Upstream Memory 3 BAR No Yes 67h – 64h 27h – 24h Reserved Upstream Memory 3 Upper 32-bit BAR No Yes 69h – 68h 69h – 68h PCI Express Tx and Rx Control PCI Express Tx and Rx Control Yes Yes 6Ah 6Ah Reserved Memory Address Forwarding Control Yes3 Yes 3 6Bh 6Bh Reserved Reserved No Yes 6Dh – 6Ch 6Dh – 6Ch Reserved Subsystem Vendor ID Yes 2 Yes 5 6Fh – 6Eh 6Fh – 6Eh Reserved Subsystem ID Yes 2 Yes 5

PCIe-to-PCI Reversible Bridge Page 29 of 145 Pericom Semiconductor November 2007, Revision 2.4 Primary Bus Configuration Access for both Transparent and Non-Transparent mode, or Secondary Bus Configuration Access for Transparent Mode Secondary Bus Configuration Access for Non-Transparent Mode Only Transparent Mode (type1) Non-Transparent Mode (Type0) EEPROM (I2C) Access SM Bus Access 73h – 70h 73h – 70h EEPROM (I2C) Control and Status Register EEPROM (I2C) Control and status Register No Yes 77h – 74h 77h – 74h Reserved Reserved No Yes 7Bh – 78h 7Bh – 78h GPIO Data and Control (20 bits) GPIO Data and Control (20 bits) No Yes 7Bh – 78h 7Bh – 78h Reserved (12 bits) Bridge Control and Status (10 bits) No No 7Bh – 78h 7Bh – 78h Reserved (12 bits) Reserved (2 bits) No No 7Ch 3Ch Reserved Secondary Interrupt Line No Yes 7Dh 3Dh Reserved Secondary Interrupt Pin No Yes 7Eh 3Eh Reserved Secondary Min_Gnt Yes 3 Yes 3 7Fh 3Fh Reserved Secondary Max_Lat Yes 3 Yes 3 83h – 80h 83h – 80h PCI-X Capability PCI-X Capability No Yes 87h – 84h 87h – 84h PCI-X Bridge Status PCI-X Bridge Status No Yes 8Bh – 88h 8Bh – 88h Upstream Split Transaction Upstream Split Transaction No Yes 8Fh – 8Ch 8Fh – 8Ch Downstream Split Transaction Downstream Split Transaction No Yes 93h – 90h 93h – 90h Power Management Capability Power Management Capability Yes Yes 97h – 94h 97h – 94h Power Management Control and Status Power Management Control and Status No Yes 9Bh – 98h 9Bh – 98h Reserved Downstream Memory

0 Translated Base

9Fh – 9Ch 9Fh – 9Ch Reserved Downstream Memory

0 Setup

A3h – A0h A3h – A0h Slot ID Capa bility Slot ID Capability No Yes A7h – A4h A7h – A 4h PCI Clock and CLKRUN Control PCI Clock and CLKRUN Control Yes Yes ABh – A8h ABh – A8h SSID and SSVID Capability Downstream I/O or Memory 1 Translated Base No Yes Afh – ACh Afh – ACh Subsystem ID and Subsystem Vendor ID Downstream I/O or Memory 1 Setup Yes Yes B3h – B0h B3h – B0h PCI Express Capa bility PCI Express Capability No Yes B7h – B4h B7h – B4h Device Capability Device Capability Yes Yes BBh – B8h BBh – B8h Device Control and Status Device Control and Status No Yes BFh – BCh BFh – BCh Link Capab ility Link Capability Yes Yes C3h – C0h C3h – C0h Link Control and Status Link Control and Status No Yes C7h – C4h C7h – C4h Slot Capa bility Slot Capability No Yes CBh – C8h CBh – C8h Slot Control and St atus Slot Control and Status No Yes CFh – CCh CFh – CCh XPIP Configuration Register 0 XPIP Configuration Register 0 Yes Yes D3h – D0h D3h – D0h XPIP Configuration Register 1 XPIP Configuration Register 1 Yes Yes D6h – D4h D6h – D4h XPIP Configuration Register 2 XPIP Configuration Register 2 Yes Yes D7h D7h Reserved Reserved Yes Yes DBh – D8h DBh – D8h VPD Capability Register VPD Capability Register No Yes DFh – DCh DFh – DCh VPD Data Register VPD Data Register Yes 4 Yes

PCIe-to-PCI Reversible Bridge Page 30 of 145 Pericom Semiconductor November 2007, Revision 2.4 Primary Bus Configuration Access for both Transparent and Non-Transparent mode, or Secondary Bus Configuration Access for Transparent Mode Secondary Bus Configuration Access for Non-Transparent Mode Only Transparent Mode (type1) Non-Transparent Mode (Type0) EEPROM (I2C) Access SM Bus Access E3h – E0h E3h – E0h Reserved Upstream Memory 0 Translated Base No Yes E7h – E4h E7h – E4h Reserved Upstream Memory 0 setup Yes3 Yes 3 EBh – E8h EBh – E8h Reserved Upstream I/O or Memory 1 Translated Base No Yes EFh – ECh EFh – ECh Reserved Upstream I/O or Memory 1 Setup Yes3 Yes 3 F3h – F0h F3h – F0h MSI Capability Register MSI Capability Register No Yes F7h – F4h F7h – F4h Message A ddress Message Address No Yes FBh – F8h FBh – F8h Message Upper Address Message Upper Address No Yes FFh – FCh FFh – FCh Message Date Message Date No Yes Note 1: When masquerade is enabled, it is pre-loadable. Note 2: When both masquerade and non-transparent mode are enabled, it is pre-loadable. Note 3: When non-transparent mode is enabled, it is pre-loadable. Note 4: The VPD data is read/write through I2C during VPD operation. Note 5: Read access only.

7.2 PCI EXPRESS EXTENDED CAPABILITY REGISTER MAP

PI7C9X110 also supports PCI Express Extended Capabilities with from 257-byte to 4096-byte space. The offset range is from 100h to FFFh. The offset 100h is defined for Advance Error Reporting (ID=0001h). The offset 150h is defined for Virtual Channel (ID=0002h). Table 7-2 PCI Express Extended Capability Register Map (100h – FFFh) Primary Bus Configuration Access for both Transparent and Non-Transparent mode, or Secondary Bus Configuration Access for Transparent Mode Secondary Bus Configuration Access for Non-Transparent Mode Only Transparent Mode (type1) Non-Transparent Mode (Type0) EEPROM (I2C) Access SM Bus Access 103h – 100h 103h – 100h Advanced Error Reporting (AER) Capability Advanced Error Reporting (AER) Capability No Yes 107h – 104h 107h – 104h Uncorrectable Error Status Uncorrectable Error Status No Yes 10Bh – 108h 10Bh – 108h Uncorrectable Error Mask Uncorrectable Error Mask No Yes 10Fh – 10Ch 10Fh – 10Ch Uncorrectable Seve rity Uncorrectable Severity No Yes 113h – 110h 113h – 110h Correctable Error Status Correctable Error Status No Yes 117h – 114h 117h – 114h Correctable Error Mask Correctable Error Mask No Yes 11Bh – 118h 11Bh – 118h AER Control AER Control No Yes 12Bh – 11Ch 12Bh – 11Ch Header Log Regi ster Header Log Register No Yes 12Fh – 12Ch 12Fh – 12Ch Secondary Uncorrectable Error Status Secondary Uncorrectable Error Status No Yes

PCIe-to-PCI Reversible Bridge Page 31 of 145 Pericom Semiconductor November 2007, Revision 2.4 Primary Bus Configuration Access for both Transparent and Non-Transparent mode, or Secondary Bus Configuration Access for Transparent Mode Secondary Bus Configuration Access for Non-Transparent Mode Only Transparent Mode (type1) Non-Transparent Mode (Type0) EEPROM (I2C) Access SM Bus Access 133h – 130h 133h – 130h Secondary Uncorrectable Error Mask Secondary Uncorrectable Error Mask No Yes 137h – 134h 137h – 134h Secondary Uncorrectable Severity Secondary Uncorrectable Severity No Yes 13Bh – 138h 13Bh – 138h Secondary AER Control Secondary AER Control No Yes 14Bh – 13Ch 14Bh – 13Ch Secondary Header Log Register Secondary Header Log Register No Yes 14Fh – 14Ch 14Fh – 14Ch Reserved Reserved No Yes 153h – 150h 153h – 150h VC Capability VC Capability No Yes 157h – 154h 157h – 154h Port VC Capability 1 Port VC Capability 1 No Yes 15Bh – 158h 15Bh – 158h Port VC Capab ility 2 Port VC Capability 2 No Yes 15Fh – 15Ch 15Fh – 15Ch Port VC Status and Control Port VC Status and Control No Yes 163h – 160h 163h – 160h VC0 Resource Capability VC0 Resource Capability No Yes 167h – 164h 167h – 164h VC0 Resource Control VC0 Resource Control No Yes 16Bh – 168h 16Bh – 168h VC0 Resource Status VC0 Resource Status No Yes 2FFh – 170h 2FFh – 170h Reserved Reserved No No 303h – 300h 503h – 500h Reserved Reserved No Yes 307h – 304h 507h – 504h Extended GPI/GPO Data and Control Extended GPI/GPO Data and Control No Yes 30Fh – 308h 50Fh – 508h Reserved Reserved No No 310h 510h Replay and Acknowledge Latency Timer Replay and Acknowledge Latency Timer Yes Yes 4FFh – 314h 4FFh – 314h Reserved Reserved No No 503h – 500h 303h – 300h Reserved Reserved No No 504h 304h Reserved Reserved No No 50Fh – 505h 30Fh – 305h Reserved Reserved No No 510h 310h Reserved Reserved No No FFFh – 514h FFFh – 514h Reserved Reserved No No Note 5: Read access only.

7.3 CONTROL AND STAT US REGISTER MAP

Table 7-3 Control and Status Register (CSR) Map (000h – FFFh) PCI Express / PCI Memory Offset SM Bus Offset Register Name Reset Value EEPROM (I2C) Access SM Bus Access 007h – 000h 207h – 200h Reserved 0 No Yes 00Bh – 008h 20Bh – 208h Downstream Memory

2 Translated Base

XXXX_XXXXh No Yes 00Fh – 00Ch 20Fh – 20Ch Downstream Memory

2 Setup

0000_0000h Yes Yes 013h – 010h 213h – 210h Downstream Memory

3 Translated Base

XXXX_XXXXh No Yes 017h – 014h 217h – 214h Downstream Memory

3 Setup

0000_0000h Yes Yes 01Bh – 018h 21Bh – 218h Downstream Memory

3 Upper 32-bit Setup

0000_0000h Yes Yes 02Fh – 01Ch 22Fh – 21Ch Reserved 0 No Yes

PCIe-to-PCI Reversible Bridge Page 32 of 145 Pericom Semiconductor November 2007, Revision 2.4 PCI Express / PCI Memory Offset SM Bus Offset Register Name Reset Value EEPROM (I2C) Access SM Bus Access 033h – 030h 233h – 230h Reserved X No Yes 037h – 034h 237h – 234h Upstream Memory 3 Setup 0000_0000h Yes Yes 03Bh – 038h 21Bh – 218h Upstream Memory 3 Upper 32-bit Setup 0000_0000h Yes Yes 04Fh – 03Ch 24Fh – 23Ch Reserved 0 No Yes 050h 250h Lookup Table Offset Register XXh No Yes 053h – 051h 253h – 251h Reserved 0 No Yes 057h – 054h 257h – 254h Lookup Table Data Register XXXX_XXXXh No Yes 05Bh – 058h 25Bh – 258h Upstream Page Boundary IRQ 0 0000_0000h No Yes 05Fh – 05Ch 25Fh – 25Ch Upstream Page Boundary IRQ 1 0000_0000h No Yes 063h – 060h 263h – 260h Upstream Page Boundary IRQ Mask 0 FFFF_FFFFh No Yes 067h – 064h 267h – 264h Upstream Page Boundary IRQ Mask 1 FFFF_FFFFh No Yes 06Fh – 068h 26Fh – 268h Reserved 0 No Yes 071h – 070h 271h – 270h Primary Clear IRQ Register 0000h No Yes 073h – 072h 273h – 272h Secondary Clear IRQ Register 0000h No Yes 075h – 074h 275h – 274h Primary Set IRQ Register 0000h No Yes 077h – 076h 277h – 276h Secondary Set IRQ Register 0000h No Yes 079h – 078h 279h – 278h Primary Clear IRQ Mask Register FFFFh No Yes 07Bh – 07Ah 27Bh – 27Ah Secondary Clear IRQ Mask Register FFFFh No Yes 07Dh – 07Ch 27Dh – 27Ch Primary Set IRQ Mask Register FFFFh No Yes 07Fh – 07Eh 27Fh – 27Eh Secondary Set IRQ Mask Register FFFFh No Yes 09Fh – 080h 29Fh – 280h Reserved 0 No Yes 0A3h – 0A0h 2A3h – 2A0h Scratc h pad 0 XXXX_XXXXh No Yes 0A7h – 0A4h 2A7h – 2A4h Scratc h pad 1 XXXX_XXXXh No Yes 0ABh – 0A8h 2ABh – 2A8h Scratch pad 2 XXXX_XXXXh No Yes 0AFh – 0ACh 2AFh – 2ACh Scratch pad 3 XXXX_XXXXh No Yes 0B3h – 0B0h 2B3h – 2B0h Scratch pad 4 XXXX_XXXXh No Yes 0B7h – 0B4h 2B7h – 2B4h Scratch pad 5 XXXX_XXXXh No Yes 0BBh – 0B8h 2BBh – 2B8h Sc ratch pad 6 XXXX_XXXXh No Yes 0BFh – 0BCh 2BCh – 2BFh Scratch pad 7 XXXX_XXXXh No Yes 0FFh – 0C0h 2FFh – 2C0h Reserved 0 No Yes 1FFh – 100h 3FFh – 300h Upstream Memory 2 Lookup Table

0 No Yes

FFFh – 200h 11FFh – 400h Reserved 0 No Yes

7.4 PCI CONFIGURATION REGISTERS FOR TRANSPARENT BRIDGE MODE

The following section describes the configuration space when the device is in transparent mode. The descriptions for different register type are listed as follow: Register Type Descriptions RO Read Only ROS Read Only and Sticky RW Read/Write

PCIe-to-PCI Reversible Bridge Page 33 of 145 Pericom Semiconductor November 2007, Revision 2.4 RWC Read/Write “1” to clear RWS Read/Write and Sticky RWCS Read/Write “1” to clear and Sticky

7.4.1 VENDOR ID – OFFSET 00h

BIT FUNCTION TYPE DESCRIPTION 15:0 Vendor ID RO Identifies Pericom as the vendor of this device. Returns 12D8h when read.

7.4.2 DEVICE ID – OFFSET 00h

BIT FUNCTION TYPE DESCRIPTION 31:16 Device ID RO Identifies this device as the PI7C9X110. Returns E110 when read.

7.4.3 COMMAND REGISTER – OFFSET 04h

BIT FUNCTION TYPE DESCRIPTION

0 I/O Space Enable RW 0: Ignore I/ O transactions on the primary interface

1: Enable response to memory transactions on the primary interface Reset to 0

1 Memory Space Enable RW 0: Ignore memory read transactions on the primary interface

1: Enable memory read transactions on the primary interface Reset to 0

2 Bus Master Enable RW 0: Do not initiate memo ry or I/O transactions on the primary interface and

disable response to memory and I/O transactions on the secondary interface 1: Enable the bridge to operate as a master on the primary interfaces for memory and I/O transactions forwarded from the secondary interface. If the primary of the reverse bridge is PCI-X mode, the bridge is allowed to initiate a split completion transaction regardless of the status bit. Reset to 0

3 Special Cycle Enable RO 0: PI7C9X110 does not re spond as a target to Special Cycle transactions, so

this bit is defined as Read-Only and must return 0 when read Reset to 0

4 Memory Write and

RO 0: PI7C9X110 does not originate a Memory Write and Invalidate transaction. Implements this bit as Read-Only and returns 0 when read (unless forwarding a transaction for another master). This bit will be ignored in PCI-X mode. Reset to 0

5 VGA Palette Snoop Enable RO /

This bit applies to reverse bridge only. 0: Ignore VGA palette access on the primary 1: Enable positive decoding response to VGA palette writes on the primary interface with I/O address bits AD [9:0] equal to 3C6h, 3C8h, and 3C9h (inclusive of ISA alias; AD [15:0] are not decoded and may be any value) Reset to 0

6 Parity Error Response

RW 0: May ignore any parity error that is detected and take its normal action 1: This bit if set, enables the setting of Master Data Parity Error bit in the Status Register when poisoned TLP received or parity error is detected and takes its normal action Reset to 0

7 Wait Cycle Control RO Wait cycle control not supported

8 SERR_L Enable Bit RW 0: Disable

1: Enable PI7C9X110 in forward bridge mode to report non-fatal or fatal error message to the Root Complex. Also, in reverse bridge mode to assert

PCIe-to-PCI Reversible Bridge Page 34 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION SERR_L on the primary interface Reset to 0

9 Fast Back-to-Back Enable RO Fast back-to-back enable not supported

10 Interrupt Disable RO /

This bit applies to reverse bridge only. 0: INTA_L, INTB_L, INTC_L, and INTD_L can be asserted on PCI interface 1: Prevent INTA_L, INTB_L, INTC_L, and INTD_L from being asserted on PCI interface Reset to 0 15:11 Reserved RO Reset to 00000

7.4.4 PRIMARY STATUS REGISTER – OFFSET 04h

BIT FUNCTION TYPE DESCRIPTION 18:16 Reserved RO Reset to 000

19 Reserved (transparent mode ) RO Reset to 0

20 Capability List Capable RO 1: PI7C9X110 supports the capability list (offset 34h in the pointer to the data structure) Reset to 1 21 66MHz Capable RO This bit applies to reverse bridge only. 1: 66MHz capable Reset to 0 when forward bridge or 1 when reverse bridge.

22 Reserved RO Reset to 0

23 Fast Back-to-Back Capable RO This bit applies to reverse bridge only. 1: Enable fast back-to-back transactions Reset to 0 when forward bridge or 1 when reverse bridge in PCI mode.

24 Master Data Parity Error

RWC Bit set if its Parity Erro r Enable bit is set and either of the conditions occurs on the primary: FORWARD BRIDGE – Receives a completion marked poisoned Poisons a write request REVERSE BRIDGE – Detected parity error when receiving data or Split Response for read Observes P_PERR_L asserted when sending data or receiving Split Response for write Receives a Split Completion Message indicating data parity error occurred for non-posted write Reset to 0 26:25 DEVSEL_L Timing (medium decode) RO These bits apply to reverse bridge only. 00: fast DEVSEL_L decoding 01: medium DEVSEL_L decoding 10: slow DEVSEL_L decoding 11: reserved Reset to 00 when forward bridge or 01 when reverse bridge.

27 Signaled Target Abort RWC FORWARD BRIDGE –

This bit is set when PI7C9X110 completes a request using completer abort status on the primary REVERSE BRIDGE – This bit is set to indicate a target abort on the primary Reset to 0

28 Received Target Abort RWC FORWARD BRIDGE –

PCIe-to-PCI Reversible Bridge Page 35 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION This bit is set when PI7C9X110 receives a completion with completer abort completion status on the primary REVERSE BRIDGE – This bit is set when PI7C9X110 detects a target abort on the primary Reset to 0

29 Received Master Abort RWC FORWARD BRIDGE –

This bit is set when PI7C9X110 receives a completion with unsupported request completion status on the primary REVERSE BRIDGE – This bit is set when PI7C9X110 detects a master abort on the primary

30 Signaled System Error RWC FORWARD BRIDGE –

This bit is set when PI7C9X110 sends an ERR_FATAL or ERR_NON_FATAL message on the primary REVERSE BRIDGE – This bit is set when PI7C9X110 asserts SERR_L on the primary Reset to 0

31 Detected Parity Error RWC FORWARD BRIDGE –

This bit is set when poisoned TLP is detected on the primary REVERSE BRIDGE – This bit is set when address or data parity error is detected on the primary Reset to 0

7.4.5 REVISION ID REGISTER – OFFSET 08h

BIT FUNCTION TYPE DESCRIPTION 7:0 Revision RO Reset to 00000002h

7.4.6 CLASS CODE REGISTER – OFFSET 08h

BIT FUNCTION TYPE DESCRIPTION 15:8 Programming Interface RO Subtractive d ecoding of PCI-PCI bridge not supported Reset to 00000000 23:16 Sub-Class Code RO Sub-Class Code 00000100: PCI-to-PCI bridge Reset to 00000100 31:24 Base Class Code RO Base class code 00000110: Bridge Device (transparent mode) Reset to 00000110 (transparent mode)

7.4.7 CACHE LINE SIZE REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RO Bit [1:0] not supported Reset to 00

2 Cache Line Size RW 1: Cache line size = 4 double words

3 Cache Line Size RW 1: Cache line size = 8 double words

4 Cache Line Size RW 1: Cache line size = 16 double words

PCIe-to-PCI Reversible Bridge Page 36 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION Reset to 0

5 Cache Line Size RW 1: Cache line size = 32 double words

7:6 Reserved RO Bit [7:6] not supported Reset to 00

7.4.8 PRIMARY LATENCY TIMER REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Primary Latency Timer RO / RW 8 bits of primary latency timer in PCI/PCI-X FORWARD BRIDGE – RO with reset to 00h REVERSE BRIDGE – RW with reset to 00h in PCI mode or 40h in PCI-X mode

7.4.9 PRIMARY HEADER TYPE REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 22:16 PCI-to-PCI bridge configuration (transparent mode) Other bridge configuration (non-transparent mode RO RO PCI-to-PCI bridge configuration (10 – 3Fh) Reset to 0000001 (transparent mode Type-0 header format configuration (10-3Fh) Reset to 0000000 (non-transparent mode)

23 Single Function Device RO 0: Indicates single function device

31:24 Reserved RO Reset to 00h

7.4.10 RESERVED REGISTERS – OFFSET 10h TO 17h

7.4.11 PRIMARY BUS NUMBER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 7:0 Primary Bus Number RW Reset to 00h

7.4.12 SECONDARY BUS NUMBER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 15:8 Secondary Bus Number RW Reset to 00h

7.4.13 SUBORDINATE BUS NUMBER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 23:16 Subordinate Bus Number RW Reset to 00h

7.4.14 SECONDARY LATENCY TIME REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 31:24 Secondary Latency Timer RW / RO Secondary latency timer in PCI / PCI-X mode FORWARD BRIDGE – RW with reset to 00h in PCI mode or 40h in PCI-X mode REVERSE BRIDGE – RO with reset to 00h

PCIe-to-PCI Reversible Bridge Page 37 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.15 I/O BASE REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 1:0 32-bit I/O Addressing Support RO 01: Indicates PI7C9X110 supports 32-bit I/O addressing Reset to 01 3:2 Reserved RO Reset to 00 7:4 I/O Base RW Indicates the I/O base (0000_0000h) Reset to 0000

7.4.16 I/O LIMIT REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 9:8 32-bit I/O Addressing Support RO 01: Indicates PI7C9X110 supports 32-bit I/O addressing Reset to 01 11:10 Reserved RO Reset to 00 15:12 I/O Base RW Indicates the I/O Limit (0000_0FFFh) Reset to 0000

7.4.17 SECONDARY STATUS REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 20:16 Reserved RO Reset to 00000 21 66MHz Capable RO Indicates PI7C9X110 is 66MHz capable Reset to 1

23 Fast Back-to-Back Capable RO FORWARD BRIDGE: reset to 1 when secondary bus is in PCI mode

(supports fast back-to-back transactions) or reset to 0 when secondary bus is in PCI-X mode (does not support fast back-to-back transactions) REVERSE BRIDGE: reset to 0 (does not support fast back-to-back transactions) RWC This bit is set if its pa rity error enable bit is set and either of the conditions occur on the primary: FORWARD BRIDGE –

• Detected parity error when receiving data or split response for read
• Observes S_PERR_L asserted when sending data or receiving split response for write
• Receives a split completion message indicating data parity error occurred for non-posted write REVERSE BRIDGE –
• Receives a completion marked poisoned
• Poisons a write request Reset to 0 26:25 DEVSEL_L Timing (medium decoding) RO These bits apply to forward bridge only. 01: medium DEVSEL_L decoding Reset to 01 when forward mode or 00 when reverse mode.

Bit is set when PI7C9X110 signals target abort REVERSE BRIDGE – Bit is set when PI7C9X110 completes a request using completer abort completion status Reset to 0

PCIe-to-PCI Reversible Bridge Page 38 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION Bit is set when PI7C9X110 detects target abort on the secondary interface REVERSE BRIDGE – Bit is set when PI7C9X110 receives a completion with completer abort completion status on the secondary interface Reset to 0 Bit is set when PI7C9X110 detects master abort on the secondary interface REVERSE BRIDGE – Bit is set when PI7C9X110 receives a completion with unsupported request completion status on the primary interface Reset to 0

30 Received System Error RWC FORWARD BRIDGE –

Bit is set when PI7C9X110 detects SERR_L assertion on the secondary interface REVERSE BRIDGE – Bit is set when PI7C9X110 receives an ERR_FATAL or ERR_NON_FATAL message on the secondary interface Reset to 0 Bit is set when PI7C9X110 detects address or data parity error REVERSE BRIDGE – Bit is set when PI7C9X110 detects poisoned TLP on secondary interface Reset to 0

7.4.18 MEMORY BASE REGISTER – OFFSET 20h

BIT FUNCTION TYPE DESCRIPTION 3:0 Reserved RO Reset to 0000 15:4 Memory Base RW Memory Base (80000000h) Reset to 800h

7.4.19 MEMORY LIMIT REGISTER – OFFSET 20h

BIT FUNCTION TYPE DESCRIPTION 19:16 Reserved RO Reset to 0000 31:20 Memory Limit RW Memory Limit (000FFFFFh) Reset to 000h

7.4.20 PREFETCHABLE MEMORY BASE REGISTER – OFFSET 24h

BIT FUNCTION TYPE DESCRIPTION 3:0 64-bit Addressing Support RO 0001: Indi cates PI7C9X110 supports 64-bit addressing Reset to 0001 15:4 Prefetchable Memory Base RW Prefetchable Memory Base (00000000_80000000h) Reset to 800h

7.4.21 PREFETCHABLE MEMORY LIMIT REGISTER – OFFSET 24h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 39 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 19:16 64-bit Addressing Support RO 0001: Indi cates PI7C9X110 supports 64-bit addressing Reset to 0001 31:20 Prefetchable Memory Limit RW Pr efetchable Memory Limit (00000000_000FFFFFh) Reset to 000h

PCIe-to-PCI Reversible Bridge Page 40 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.22 PREFETCHABLE BASE UPPER 32-BIT REGISTER – OFFSET 28h

BIT FUNCTION TYPE DESCRIPTION 31:0 Prefetchable Base Upper 32- bit RW Bit [63:32] of prefetchable base Reset to 00000000h

7.4.23 PREFETCHABLE LIMIT UPPER 32-BIT REGISTER – OFFSET 2Ch

BIT FUNCTION TYPE DESCRIPTION 31:0 Prefetchable Limit Upper 32-bit RW Bit [63:32] of prefetchable limit Reset to 00000000h

7.4.24 I/O BASE UPPER 16-BIT REGISTER – OFFSET 30h

BIT FUNCTION TYPE DESCRIPTION 15:0 I/O Base Upper 16-bit RW Bit [31:16] of I/O Base Reset to 0000h

7.4.25 I/O LIMIT UPPER 16-BIT REGISTER – OFFSET 30h

BIT FUNCTION TYPE DESCRIPTION 31:16 I/O Limit Upper 16-bit RW Bit [31:16] of I/O Limit Reset to 0000h

7.4.26 CAPABILITY POINTER – OFFSET 34h

BIT FUNCTION TYPE DESCRIPTION 31:8 Reserved RO Reset to 0 7:0 Capability Pointer RO Capability pointer to 80h Reset to 80h

7.4.27 EXPANSION ROM BASE ADDRESS REGISTER – OFFSET 38h

BIT FUNCTION TYPE DESCRIPTION 31:0 Expansion ROM Base Address RO Expansion ROM not supported. Reset to 00000000h

7.4.28 INTERRUPT LINE REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Interrupt Line RW These bits apply to reverse bridge only. For initialization code to program to tell which input of the interrupt controller the PI7C9X110’s INTA_L in connected to. Reset to 00000000

PCIe-to-PCI Reversible Bridge Page 41 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.29 INTERRUPT PIN REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Interrupt Pin RO These bits apply to reverse bridge only. Designates interrupt pin INTA_L, is used Reset to 00h when forward mode or 01h when reverse mode.

7.4.30 BRIDGE CONTROL REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION

16 Parity Error Response

RW 0: Ignore parity errors on the secondary 1: Enable parity error detection on secondary FORWARD BRIDGE – Controls the response to uncorrectable address attribute and data errors on the secondary REVERSE BRIDGE – Controls the setting of the master data parity error bit in response to a received poisoned TLP from the secondary (PCIe link) Reset to 0

17 SERR_L Enable RW 0: Disable the forwarding of SERR_L to ERR_FATAL and

ERR_NONFATAL 1: Enable the forwarding of SERR_L to ERR_FATAL and ERR_NONFATAL Reset to 0 (FORWARD BRIDGE) RO bit for REVERSE BRIDGE

18 ISA Enable RW 0: Forward downstream all I/O addresses in the address range defined by the

I/O Base and Limit registers 1: Forward upstream all I/O addresses in the address range defined by the I/O Base and Limit registers that are in the first 64KB of PCI I/O address space (top 768 bytes of each 1KB block) Reset to 0

19 VGA Enable RW 0: Do not forward VGA compatible memory and I/O addresses from the

primary to secondary, unless they are enabled for forwarding by the defined I/O and memory address ranges 1: Forward VGA compatible memory and I/O addresses from the primary and secondary (if the I/O enable and memory enable bits are set), independent of the ISA enable bit

20 VGA 16-bit Decode RW 0: Execute 10- bit address decodes on VGA I/O accesses

1: Execute 16-bit address decode on VGA I/O accesses Reset to 0

21 Master Abort Mode RW 0: Do not report mast er aborts (return FFFFFFFFh on reads and discards

data on write) 1: Report master abort by signaling target abort if possible or by the assertion of SERR_L (if enabled). Reset to 0 22 Secondary Interface Reset RW 0: Do not force the assertion of RESET_L on secondary PCI bus for forward bridge, or do not generate a hot reset on the PCIe link for reverse bridge 1: Force the assertion of RESET_L on secondary PCI bus for forward bridge, or generate a hot reset on the PCIe link for reverse bridge Reset to 0

23 Fast Back-to-Back Enable RO Fast back-to-back not supported

PCIe-to-PCI Reversible Bridge Page 42 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

24 Primary Master Timeout RW 0: Primary discard timer counts 215 PCI clock cycles

1: Primary discard timer counts 210 PCI clock cycles FORWARD BRIDGE – Bit is RO and ignored by the PI7C9X110 Reset to 0

25 Secondary Master Timeout RW 0: Secondary discard timer counts 215 PCI clock cycles

1: Secondary discard timer counts 210 PCI clock cycles REVERSE BRIDGE – Bit is RO and ignored by PI7C9X110 Reset to 0

26 Master Timeout Status RWC Bit is set when the discard timer expires and a delayed completion is

discarded at the PCI interface for the forward or reverse bridge Reset to 0

27 Discard Timer SERR_L

RW Bit is set to enable to gene rate ERR_NONFATAL or ERR_FATAL for forward bridge, or assert P_SERR_L for reverse bridge as a result of the expiration of the discard timer on the PCI interface. Reset to 0 31:28 Reserved RO Reset to 0000

7.4.31 PCI DATA BUFFERING CO NTROL REGISTER – OFFSET 40h

BIT FUNCTION TYPE DESCRIPTION

0 Secondary Internal Arbiter’s

RW 0: Park to the last master 1: Park to PI7C9X110 secondary port Reset to 0

1 Memory Read Prefetching

RW 0: Enable memory read prefetchi ng dynamic control for PCI to PCIe read 1: Disable memory read prefetching dynamic control for PCI to PCIe read Reset to 0

2 Completion Data Prediction

RW 0: Enable completion data pr ediction for PCI to PCIe read. 1: Disable completion data prediction Reset to 0

3 Reserved RO Reset to 0

5:4 PCI Read Multiple Prefetch Mode RW These two bits are ignored in PCI-X mode. 00: One cache line prefetch if memory read multiple address is in prefetchable range at the PCI interface 01: Full prefetch if address is in prefetchable range at PCI interface, and the PI7C9X110 will keep remaining data after it disconnects the external master during burst read with read multiple command until the discard timer expires 10: Full prefetch if address is in prefetchable range at PCI interface 11: Full prefetch if address is in prefetchable range at PCI interface and the PI7C9X110 will keep remaining data after the read multiple is terminated either by an external master or by the PI7C9X110, until the discard time expires Reset to 10

PCIe-to-PCI Reversible Bridge Page 43 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 7:6 PCI Read Line Prefetch Mode RW These two bits are ignored in PCI-X mode. 00: Once cache line prefetch if memory read address is in prefetchable range at PCI interface 01: Full prefetch if address is in prefetchable range at PCI interface and the PI7C9X110 will keep remaining data after it is disconnected by an external master during burst read with read line command, until discard timer expires 10: Full prefetch if memory read line address is in prefetchable range at PCI interface 11: Full prefetch if address is in prefetchable range at PCI interface and the PI7C9X110 will keep remaining data after the read line is terminated either by an external master or by the PI7C9X110, until the discard timer expires Reset to 00 9:8 PCI Read Prefetch Mode RW 00: One cache line prefet ch if memory read address is in prefetchable range at PCI interface 01: Reserved 10: Full prefetch if memory read address is in prefetchable range at PCI interface 11: Disconnect on the first DWORD Reset to 00

10 PCI Special Delayed Read

RW 0: Retry any master at PCI bus that repeats its transaction with command code changes. 1: Allows any master at PCI bus to change memory command code (MR, MRL, MRM) after it has received a retry. The PI7C9X110 will complete the memory read transaction and return data back to the master if the address and byte enables are the same. Reset to 0

11 Reserved RO Reset to 0

14:12 Maximum Memory Read Byte Count RW Maximum byte count is used by the PI7C9X110 when generating memory read requests on the PCIe link in response to a memory read initiated on the PCI bus and bit [9:8], bit [7:6], and bit [5:4] are set to “full prefetch”. 000: 512 bytes (default) 001: 128 bytes 010: 256 bytes 011: 512 bytes 100: 1024 bytes 101: 2048 bytes 110: 4096 bytes 111: 512 bytes Reset to 000

7.4.32 CHIP CONTROL 0 REGISTER – OFFSET 40h

BIT FUNCTION TYPE DESCRIPTION

15 Flow Control Update

RW 0: Flow control is updated for every two credits available 1: Flow control is updated for every on credit available Reset to 0

PCIe-to-PCI Reversible Bridge Page 44 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

16 PCI Retry Counter Status RWC 0: The PCI retr y counter has not expired since the last reset

1: The PCI retry counter has expired since the last reset Reset to 0 18:17 PCI Retry Counter Control RW 00: No expiration limit 01: Allow 256 retries before expiration 10: Allow 64K retries before expiration 11: Allow 2G retries before expiration Reset to 00

19 PCI Discard Timer Disable RW 0: Enable the PCI di scard timer in conjunction with bit [27] offset 3Ch

(bridge control register) 1: Disable the PCI discard timer in conjunction with bit [27] offset 3Ch (bridge control register) Reset to 0

20 PCI Discard Timer Short

RW 0: Use bit [24] offset 3Ch for forward bridge or bit [25] offset 3Ch for reverse bridge to indicate how many PCI clocks should be allowed before the PCI discard timer expires 1: 64 PCI clocks allowed before the PCI discard timer expires Reset to 0 22:21 Configuration Request Retry Timer Counter Value Control RW 00: Timer expires at 25us 01: Timer expires at 0.5ms 10: Timer expires at 5ms 11: Timer expires at 25ms Reset to 01

23 Delayed Transaction Order

RW 0: Enable out-of-order capability between delayed transactions 1: Disable out-of-order capability between delayed transactions Reset to 0 25:24 Completion Timer Counter Value Control RW 00: Timer expires at 50us 01: Timer expires at 10ms 10: Timer expires at 50ms 11: Timer disabled Reset to 01

26 Isochronous Traffic Support

RW 0: All memory transactions from PCI-X to PCIe will be mapped to TC0 1: All memory transactions from PCI-X to PCIe will be mapped to Traffic Class defined in bit [29:27] of offset 40h. Reset to 0 29:27 Traffic Class Used For Isochronous Traffic RW Reset to 001

30 Serial Link Interface

0: Normal mode 1: Enable serial link interface loopback mode (TX to RX) if TM0=LOW, TM1=HIGH, TM2=HIGH, MSK_IN=HIGH, REVRSB=HIGH. PCI transaction from PCI bus will loop back to PCI bus RO for forward bridge Reset to 0

31 Primary Configuration

0: PI7C9X110 configuration space can be accessed from both interfaces 1: PI7C9X110 configuration space can only be accessed from the secondary interface. Primary bus accessed receives completion with CRS status for forward bridge, or target retry for reverse bridge Reset to 0 if TM0 is LOW

PCIe-to-PCI Reversible Bridge Page 45 of 145 Pericom Semiconductor November 2007, Revision 2.4

PCIe-to-PCI Reversible Bridge Page 46 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.33 RESERVED REGISTER – OFFSET 44h

BIT FUNCTION TYPE DESCRIPTION 31:0 Reserved RO Reset to 00000000h

7.4.34 ARBITER ENABLE REGISTER – OFFSET 48h

BIT FUNCTION TYPE DESCRIPTION

0 Enable Arbiter 0 RW 0: Disable arb itration for internal PI7C9X110 request

1: Enable arbitration for internal PI7C9X110 request Reset to 1

1 Enable Arbiter 1 RW 0: Disable arbitration for master 1

1: Enable arbitration for master 1 Reset to 1

2 Enable Arbiter 2 RW 0: Disable arbitration for master 2

1: Enable arbitration for master 2 Reset to 1

3 Enable Arbiter 3 RW 0: Disable arbitration for master 3

1: Enable arbitration for master 3 Reset to 1

4 Enable Arbiter 4 RW 0: Disable arbitration for master 4

1: Enable arbitration for master 4 Reset to 1

5 Enable Arbiter 5 RW 0: Disable arbitration for master 5

1: Enable arbitration for master 5 Reset to 1

6 Enable Arbiter 6 RW 0: Disable arbitration for master 6

1: Enable arbitration for master 6 Reset to 1

7 Enable Arbiter 7 RW 0: Disable arbitration for master 7

1: Enable arbitration for master 7 Reset to 1

8 Enable Arbiter 8 RW 0: Disable arbitration for master 8

1: Enable arbitration for master 8 Reset to 1

7.4.35 ARBITER MODE REGISTER – OFFSET 48h

BIT FUNCTION TYPE DESCRIPTION

9 External Arbiter Bit RO 0: Enable in ternal arbiter (if CFN_L is tied LOW)

1: Use external arbiter (if CFN_L is tied HIGH) Reset to 0/1 according to what CFN_L is tied to

10 Broken Master Timeout

RW 0: Broken master timeout disable 1: This bit enables the internal arbiter to count 16 PCI bus cycles while waiting for FRAME_L to become active when a device’s PCI bus GNT is active and the PCI bus is idle. If the broken master timeout expires, the PCI bus GNT for the device is de-asserted. Reset to 0

PCIe-to-PCI Reversible Bridge Page 47 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

11 Broken Master Refresh

RW 0: A broken master will be ignored forever after de-asserting its REQ_L for at least 1 clock 1: Refresh broken master state after all the other masters have been served once Reset to 0 19:12 Arbiter Fairness Counter RW 08h: These bits are the initialization value of a counter used by the internal arbiter. It controls the number of PCI bus cycles that the arbiter holds a device’s PCI bus GNT active after detecting a PCI bus REQ_L from another device. The counter is reloaded whenever a new PCI bus GNT is asserted. For every new PCI bus GNT, the counter is armed to decrement when it detects the new fall of FRAME_L. If the arbiter fairness counter is set to 00h, the arbiter will not remove a device’s PCI bus GNT until the device has de- asserted its PCI bus REQ. Reset to 08h

20 GNT_L Output Toggling

RW 0: GNT_L not de-asserted afte r granted master assert FRAME_L 1: GNT_L de-asserts for 1 clock after 2 clocks of the granted master asserting FRAME_L Reset to 0

21 Reserved RO Reset to 0

7.4.36 ARBITER PRIORITY REGISTER – OFFSET 48h

BIT FUNCTION TYPE DESCRIPTION

22 Arbiter Priority 0 RW 0: Low prio rity request to internal PI7C9X110

1: High priority request to internal PI7C9X110 Reset to 1

23 Arbiter Priority 1 RW 0: Low priority request to master 1

1: High priority request to master 1 Reset to 0

24 Arbiter Priority 2 RW 0: Low priority request to master 2

1: High priority request to master 2 Reset to 0

25 Arbiter Priority 3 RW 0: Low priority request to master 3

1: High priority request to master 3 Reset to 0

26 Arbiter Priority 4 RW 0: Low priority request to master 4

1: High priority request to master 4 Reset to 0

27 Arbiter Priority 5 RW 0: Low priority request to master 5

1: High priority request to master 5 Reset to 0

28 Arbiter Priority 6 RW 0: Low priority request to master 6

1: High priority request to master 6 Reset to 0

29 Arbiter Priority 7 RW 0: Low priority request to master 7

1: High priority request to master 7 Reset to 0

PCIe-to-PCI Reversible Bridge Page 48 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

30 Arbiter Priority 8 RW 0: Low priority request to master 8

1: High priority request to master 8 Reset to 0

31 Reserved RO Reset to 0

7.4.37 RESERVED REGISTERS – OFFSET 4Ch – 64h

7.4.38 EXPRESS TRANSMITTER/RECEIVER REGISTER – OFFSET 68h

BIT FUNCTION TYPE DESCRIPTION 1:0 Nominal Driver Current Control RW 00: 20mA 01: 10mA 10: 28mA 11: Reserved Reset to 00 5:2 Driver Current Scale Multiple Control RW 0000: 1.00 x nominal driver current 0001: 1.05 x nominal driver current 0010: 1.10 x nominal driver current 0011: 1.15 x nominal driver current 0100: 1.20 x nominal driver current 0101: 1.25 x nominal driver current 0110: 1.30 x nominal driver current 0111: 1.35 x nominal driver current 1000: 1.60 x nominal driver current 1001: 1.65 x nominal driver current 1010: 1.70 x nominal driver current 1011: 1.75 x nominal driver current 1100: 1.80 x nominal driver current 1101: 1.85 x nominal driver current 1110: 1.90 x nominal driver current 1111: 1.95 x nominal driver current Reset to 0000 11:8 Driver De-emphasis Level Control RW 0000: 0.00 db 0001: -0.35 db 0010: -0.72 db 0011: -1.11 db 0100: -1.51 db 0101: -1.94 db 0110: -2.38 db 0111: -2.85 db 1000: -3.35 db 1001: -3.88 db 1010: -4.44 db 1011: -5.04 db 1100: -5.68 db 1101: -6.38 db 1110: -7.13 db 1111: -7.96 db Reset to 1000 13:12 Transmitter Termination Control RW 00: 52 ohms 01: 57 ohms 10: 43 ohms 11: 46 ohms Reset to 00

PCIe-to-PCI Reversible Bridge Page 49 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 15:14 Receiver Termination Control RW 00: 52 ohms 01: 57 ohms 10: 43 ohms 11: 46 ohms Reset to 00 29:16 Reserved RO Reset to 00h

7.4.39 UPSTREAM MEMORY WRITE FRAGMENT CONTROL REGISTER – OFFSET 68h

BIT FUNCTION TYPE DESCRIPTION 31:30 Memory Write Fragment Control RW Upstream Memory Write Fragment Control 00: Fragment at 32-byte boundary 01: Fragment at 64-byte boundary 1x: Fragement at 128-byte boundary Reset to 10h

7.4.40 RESERVED REGISTER – OFFSET 6Ch

7.4.41 EEPROM AUTOLOAD CONTROL/STATUS REGISTER – OFFSET 70h

BIT FUNCTION TYPE DESCRIPTION

0 Initiate EEPROM Read or

RW This bit will be reset to 0 afte r the EEPROM operation is finished. 0: EEPROM AUTOLOAD disabled 0 -> 1: Starts the EEPROM Read or Write cycle Reset to 0

1 Control Command for

RW 0: Read 1: Write Reset to 0

2 EEPROM Error RO 0: EEPROM acknowledge is always received during the EEPROM cycle

1: EEPROM acknowledge is not received during EEPROM cycle Reset to 0

3 EPROM Autoload Complete

RO 0: EEPROM autoload is not successfully completed 1: EEPROM autoload is successfully completed Reset to 0 5:4 EEPROM Clock Frequency Control RW Where PCLK is 125MHz 00: PCLK / 4096 01: PCLK / 2048 10: PCLK / 1024 11: PCLK / 128 Reset to 00

6 EEPROM Autoload Control RW 0: Enable EEPROM autoload

1: Disable EEPROM autoload Reset to 0

7 Fast EEPROM Autoload

RW 0: Normal speed of EEPROM autoload 1: Increase EEPROM autoload by 32x Reset to 0

PCIe-to-PCI Reversible Bridge Page 50 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

8 EEPROM Autoload Status RO 0: EEPROM autoload is not on going

1: EEPROM autoload is on going Reset to 0 15:9 EEPROM Word Address RW EEPROM word address for EEPROM cycle Reset to 0000000 31:16 EEPROM Data RW EEPROM data to be written into the EEPROM Reset to 0000h

PCIe-to-PCI Reversible Bridge Page 51 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.42 RESERVED REGISTER – OFFSET 74h

7.4.43 GPIO DATA AND CONTROL REGISTER – OFFSET 78h

BIT FUNCTION TYPE DESCRIPTION 11:0 Reserved RO Reset to 000h 15:12 GPIO Output Write-1-to- Clear RW Reset to 0h 19:16 GPIO Output Write-1-to-Set RW Reset to 0h 23:20 GPIO Output Enable Write- 1-to-Clear RW Reset to 0h 27:24 GPIO Output Enable Write- 1-to-Set RW Reset to 0h 31:28 GPIO Input Data Register RO Reset to 0h

7.4.44 RESERVED REGISTER – OFFSET 7Ch

7.4.45 PCI-X CAPABILITY ID REGISTER – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 7:0 PCI-X Capability ID RO PCI-X Capability ID Reset to 07h

7.4.46 NEXT CAPABILITY POINTER REGISTER – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Capability Pointer RO Point to power management Reset to 90h

7.4.47 PCI-X SECONDARY STATUS REGISTER – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 16 64-bit Device on Secondary Bus Interface RO 64-bit not supported Reset to 0 17 133MHz Capable RO When this bit is 1, PI7C9X110 is 133MHz capable on its secondary bus interface Reset to 1 in forward bridge mode or 0 in reverse bridge mode

18 Split Completion Discarded RO /

This bit is a read-only and set to 0 in reverse bridge mode or is read-write in forward bridge mode When this is set to 1, a split completion has been discarded by PI7C9X110 at secondary bus because the requester did not accept the split completion transaction Reset to 0

19 Unexpected Split

RWC This bit is set to 0 in forward bridge mode or is read-write in reverse bridge mode When this is set to 1, an unexpected split completion has been received with the requester ID equaled to the secondary bus number, device number, and function number at the PI7X9X110 secondary bus interface Reset to 0

PCIe-to-PCI Reversible Bridge Page 52 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

20 Split Completion Overrun RWC When this bit is set to 1, a split completion has been terminated by

PI7C9X110 with either a retry or disconnect at the next ADB due to the buffer full condition Reset to 0 21 Split Request Delayed RWC When this bit is set to 1, a split request is delayed because PI7C9X110 is not able to forward the split request transaction to its secondary bus due to insufficient room within the limit specified in the split transaction commitment limit field of the downstream split transaction control register Reset to 0 24:22 Secondary Clock Fre quency RO These bits are only meaningful in forward bridge mode. In reverse bridge mode, all three bits are set to zero. 000: Conventional PCI mode (minimum clock period not applicable) 001: 66MHz (minimum clock period is 15ns) 010: 100 to 133MHz (minimum clock period is 7.5ns) 011: Reserved 1xx: Reserved Reset to 000 31:25 Reserved RO 0000000

7.4.48 PCI-X BRIDGE STATUS REGISTER – OFFSET 84h

BIT FUNCTION TYPE DESCRIPTION 2:0 Function Number RO Function number (AD [10: 8] of a type 0 configuration transaction) Reset to 000 7:3 Device Number RO Device number (AD [15:11] of a type 0 configuration transaction) is assigned to the PI7C9X110 by the connection of system hardware. Each time the PI7C9X110 is addressed by a configuration write transaction, the bridge updates this register with the contents of AD [15:11] of the address phase of the configuration transaction, regardless of which register in the PI7C9X110 is addressed by the transaction. The PI7C9X110 is addressed by a configuration write transaction if all of the following are true:

• The transaction uses a configuration write command
• IDSEL is asserted during the address phase
• AD [1:0] are 00 (type o configuration transaction)
• AD [10:8] of the configuration address contain the appropriate function number Reset to 11111 15:8 Bus Number RO Additional address from wh ich the contents of the primary bus number register on type 1 configuration space header is read. The PI7C9X110 uses the bus number, device number, and function number fields to create a completer ID when responding with a split completion to a read of an internal PI7C9X110 register. These fields are also used for cases when one interface is in conventional PCI mode and the other is in PCI-X mode. Reset to 11111111 16 64-bit Device on Primary Bus Interface RO 64-bit not supported Reset to 0 17 133MHz Capable RO When this bit is 1, PI7C9X110 is 133MHz capable on its primary bus interface Reset to 0 in forward bridge mode or 1 in reverse bridge mode

PCIe-to-PCI Reversible Bridge Page 53 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION This bit is a read-only and set to 0 in reverse bridge mode or is read-write in forward bridge mode When this is set to 1, a split completion has been discarded by PI7C9X110 at primary bus because the requester did not accept the split completion transaction Reset to 0 RWC This bit is set to 0 in forward bridge mode or is read-write in reverse bridge mode When this is set to 1, an unexpected split completion has been received with the requester ID equaled to the primary bus number, device number, and function number at the PI7X9X110 primary bus interface Reset to 0 PI7C9X110 with either a retry or disconnect at the next ADB due to the buffer full condition Reset to 0 21 Split Request Delayed RWC When this bit is set to 1, a split request is delayed because PI7C9X110 is not able to forward the split request transaction to its primary bus due to insufficient room within the limit specified in the split transaction commitment limit field of the downstream split transaction control register Reset to 0 31:22 Reserved RO 0000000000

7.4.49 UPSTREAM SPLIT TRANSACTION REGISTER – OFFSET 88h

BIT FUNCTION TYPE DESCRIPTION 15:0 Upstream Split Transaction Capability RO Upstream Split Transaction Capability sp ecifies the size of the buffer (in the unit of ADQs) to store split completions for memory read. It applies to the requesters on the secondary bus in addressing the completers on the primary bus. The 0010h value shows that the buffer has 16 ADQs or 2K bytes storage Reset to 0010h 31:16 Upstream Split Transaction Commitment Limit RW Upstream Split Transaction Commitment Limit indicates the cumulative sequence size of the commitment limit in units of ADQs. This field can be programmed to any value or equal to the content of the split capability field. For example, if the limit is set to FFFFh, PI7C9X110 is allowed to forward all split requests of any size regardless of the amount of buffer space available. The split transaction commitment limit is set to 0010h that is the same value as the split transaction capability. Reset to 0010h

7.4.50 DOWNSTREAM SPLIT TRANSACTION REGISTER – OFFSET 8Ch

BIT FUNCTION TYPE DESCRIPTION 15:0 Downstream Split Transaction Capability RO Downstream Split Transaction Capability specifies the size of the buffer (in the unit of ADQs) to store split completions for memory read. It applies to the requesters on the primary bus in addressing the completers on the secondary bus. The 0010h value shows that the buffer has 16 ADQs or 2K bytes storage Reset to 0010h

PCIe-to-PCI Reversible Bridge Page 54 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:16 Downstream Split Transaction Commitment Limit RW Downstream Split Transaction Comm itment Limit indicates the cumulative sequence size of the commitment limit in units of ADQs. This field can be programmed to any value or equal to the content of the split capability field. For example, if the limit is set to FFFFh, PI7C9X110 is allowed to forward all split requests of any size regardless of the amount of buffer space available. The split transaction commitment limit is set to 0010h that is the same value as the split transaction capability. Reset to 0010h

7.4.51 POWER MANAGEMENT ID REGISTER – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 7:0 Power Management ID RO Po wer Management ID Register Reset to 01h

7.4.52 NEXT CAPABILITY POINTER REGISTER – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer (point to Subsystem ID and Subsystem Vendor ID) Reset to A8h

7.4.53 POWER MANAGEMENT CAPABILITY REGISTER – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 18:16 Version Number RO Version number that complies with revision 2.0 of the PCI Power Management Interface specification. Reset to 010

19 PME Clock RO PME clock is not required for PME_L generation

20 Reserved RO Reset to 0

21 Device Specific Initialization

(DSI) RO DSI – no special initialization of th is function beyond the standard PCI configuration header is required following transition to the D0 un-initialized state Reset to 0 24:22 AUX Current RO 000: 0mA 001: 55mA 010: 100mA 011: 160mA 100: 220mA 101: 270mA 110: 320mA 111: 375mA Reset to 001

25 D1 Power Management RO D1 pow er management is not supported

26 D2 Power Management RO D2 pow er management is not supported

31:27 PME_L Support RO PME_L is supported in D3 cold, D3 hot, and D0 states. Reset to 11001

PCIe-to-PCI Reversible Bridge Page 55 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.54 POWER MANAGEMENT CONTROL AND STATUS REGISTER – OFFSET 94h

BIT FUNCTION TYPE DESCRIPTION 1:0 Power State RW Power State is used to determ ine the current power state of PI7C9X110. If a non-implemented state is written to this register, PI7C9X110 will ignore the write data. When present state is D3 and changing to D0 state by programming this register, the power state change causes a device reset without activating the RESET_L of PCI/PCI-X bus interface 00: D0 state 01: D1 state not implemented 10: D2 state not implemented 11: D3 state Reset to 00 7:2 Reserved RO Reset to 000000

8 PME Enable RWS 0: PME_L assertion is disabled

1: PME_L assertion is enabled Reset to 0 12:9 Data Select RO Data re gister is not implemented Reset to 0000 14:13 Data Scale RO Data re gister is not implemented Reset to 00

15 PME Status RWCS PME_L is supported

7.4.55 PCI-TO-PCI SUPPORT EXTEN SION REGISTER – OFFSET 94h

BIT FUNCTION TYPE DESCRIPTION 21:16 Reserved RO Reset to 000000

22 B2/B3 Support RO 0: B2 / B3 not support for D3hot

23 PCI Bus Power/Clock

RO 0: PCI Bus Power/Clock Disabled Reset to 0 31:24 Data Register RO Data register is not implemented Reset to 00h

7.4.56 RESERVED REGISTERS – OFFSET 98h – 9Ch

7.4.57 CAPABILITY ID REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID RO Capability ID fo r Slot Identification. SI is off by default but can be turned on through EEPROM interface Reset to 04h

7.4.58 NEXT POINTER REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer – poi nts to PCI Express capabilities register Reset to B0h

PCIe-to-PCI Reversible Bridge Page 56 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.59 SLOT NUMBER REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 20:16 Expansion Slot Number RW Expansion slot number Reset to 00000

21 First In Chassis RW First in chassis

23:22 Reserved RO Reset to 00

7.4.60 CHASSIS NUMBER REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 31:24 Chassis Number RW Chassis number Reset to 00h

7.4.61 SECONDARY CLOCK AND CLKRUN CONTROL REGISTER – OFFSET A4h

BIT FUNCTION TYPE DESCRIPTION 1:0 S_CLKOUT0 Enable RW S_CLKOUT (Slot 0) Enable for forward bridge mode only 00: enable S_CLKOUT0 01: enable S_CLKOUT0 10: enable S_CLKOUT0 11: disable S_CLKOUT0 and driven LOW Reset to 00 3:2 S_CLKOUT1 Enable RW S_CLKOUT (Slot 1) Enable for forward bridge mode only 00: enable S_CLKOUT1 01: enable S_CLKOUT1 10: enable S_CLKOUT1 11: disable S_CLKOUT1 and driven LOW Reset to 00 5:4 S_CLKOUT2 Enable RW S_CLKOUT (Slot 2) Enable for forward bridge mode only 00: enable S_CLKOUT2 01: enable S_CLKOUT2 10: enable S_CLKOUT2 11: disable S_CLKOUT2 and driven LOW Reset to 00 7:6 S_CLKOUT3 Enable RW S_CLKOUT (Slot 3) Enable for forward bridge mode only 00: enable S_CLKOUT3 01: enable S_CLKOUT3 10: enable S_CLKOUT3 11: disable S_CLKOUT3 and driven LOW Reset to 00

8 S_CLKOUT4 Enable RW S_CLKOUT (Device 1) Enable for forward bridge mode only

0: enable S_CLKOUT4 1: disable S_CLKOUT4 and driven LOW Reset to 0

PCIe-to-PCI Reversible Bridge Page 57 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

9 S_CLKOUT5 Enable RW S_CLKOUT (Device 2) Enable for forward bridge mode only

0: enable S_CLKOUT5 1: disable S_CLKOUT5 and driven LOW Reset to 0

10 S_CLKOUT6 Enable RW S_CLKOUT (Device 3) Enable for forward bridge mode only

0: enable S_CLKOUT6 1: disable S_CLKOUT6 and driven LOW Reset to 0

11 S_CLKOUT7 Enable RW S_CLKOUT (Device 4) Enable for forward bridge mode only

0: enable S_CLKOUT7 1: disable S_CLKOUT7 and driven LOW Reset to 0

12 S_CLKOUT8 Enable RW S_CLKOUT (the bridge ) Enable for forward bridge mode only

0: enable S_CLKOUT8 1: disable S_CLKOUT8 and driven LOW Reset to 0

13 Secondary Clock Stop Status RO Secondary clock stop status

0: secondary clock not stopped 1: secondary clock stopped Reset to 0

14 Secondary Clkrun Protocol

RW 0: disable protocol 1: enable protocol Reset to 0

15 Clkrun Mode RW 0: Stop the secondary cl ock only when bridge is at D3hot state

1: Stop the secondary clock whenever the secondary bus is idle and there are no requests from the primary bus Reset to 0 31:16 Reserved RO Reset to 0000h

7.4.62 CAPABILITY ID REGISTER – OFFSET A8h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID RO Capability ID for subsystem ID and subsystem vendor ID Reset to 0Dh

7.4.63 NEXT POINTER REGISTER – OFFSET A8h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Item Pointer RO Next item pointer (point to PCI Express Capability by default but can be programmed to A0h if Slot Identification Capability is enabled) Reset to B0h

7.4.64 RESERVED REGISTER – OFFSET A8h

BIT FUNCTION TYPE DESCRIPTION 31:16 Reserved RO Reset to 0000h

PCIe-to-PCI Reversible Bridge Page 58 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.65 SUBSYSTEM VENDOR ID REGISTER – OFFSET ACh

BIT FUNCTION TYPE DESCRIPTION 15:0 Subsystem Vendor ID RO Subsystem vendor ID id entifies the particular add-in card or subsystem Reset to 00h

7.4.66 SUBSYSTEM ID REGISTER – OFFSET ACh

BIT FUNCTION TYPE DESCRIPTION 31:16 Subsystem ID RO Subsystem ID identifie s the particular add-in card or subsystem Reset to 00h

7.4.67 PCI EXPRESS CAPABILITY ID REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 7:0 PCI Express Capability ID RO PCI Express capability ID Reset to 10h

7.4.68 NEXT CAPABILITY POINTER REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Item Pointer RO Next ite m pointer (points to VPD register) Reset to D8h

7.4.69 PCI EXPRESS CAPABILIT Y REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 19:16 Capability Version RO Reset to 1h 23:20 Device / Port Type RO 0000: PCI Express endpoint device 0001: Legacy PCI Express endpoint device 0100: Root port of PCI Express root complex 0101: Upstream port of PCI Express switch 0110: Downstream port of PCI Express switch 0111: PCI Express to PCI bridge 1000: PCI to PCI Express bridge Others: Reserved Reset to 7h for Forward Bridge or 8h for Reverse Bridge

24 Slot Implemented RO Reset to 0 for Fo rward Bridge or 1 for Reverse Bridge

29:25 Interrupt Message Nu mber RO Reset to 0h 31:30 Reserved RO Reset to 0

7.4.70 DEVICE CAPABILITY REGISTER – OFFSET B4h

BIT FUNCTION TYPE DESCRIPTION 2:0 Maximum Payload Size RO 000: 128 bytes 001: 256 bytes 010: 512 bytes 011: 1024 bytes 100: 2048 bytes 101: 4096 bytes 110: reserved 111: reserved Reset to 001

PCIe-to-PCI Reversible Bridge Page 59 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 4:3 Phantom Functions RO No phantom functions supported Reset to 00 5 8-bit Tag Field RO 8-bit tag field supported Reset to 1 8:6 Endpoint L0’s Latency RO Endpoint L0’s acceptable latency 000: less than 64 ns 001: 64 – 128 ns 010: 128 – 256 ns 011: 256 – 512 ns 100: 512 ns – 1 us 101: 1 – 2 us 110: 2 – 4 us 111: more than 4 us Reset to 000 11:9 Endpoint L1’s Latency RO Endpoint L1’s acceptable latency 000: less than 1 us 001: 1 – 2 us 010: 2 – 4 us 011: 4 – 8 us 100: 8 – 16 us 101: 16 – 32 us 110: 32 – 64 us 111: more than 64 us Reset to 000

12 Attention Button Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enabled at Forward Bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping.

13 Attention Indicator Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enable at Forward Bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping.

14 Power Indicator Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enable at Forward Bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 17:15 Reserved RO Reset to 000 25:18 Captured Slot Power Limit Value RO These bits are set by the Set_Slot_Power_Limit message Reset to 00h 27:26 Captured Slot Power Limit Scale RO This value is set by the Set_Slot_Power_Limit message Reset to 00 31:28 Reserved RO Reset to 0h

7.4.71 DEVICE CONTROL REGISTER – OFFSET B8h

BIT FUNCTION TYPE DESCRIPTION

0 Correctable Error Reporting

1 Non-Fatal Error Reporting

2 Fatal Error Reporting Enable RW Reset to 0h

PCIe-to-PCI Reversible Bridge Page 60 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

3 Unsupported Request

4 Relaxed Ordering Enable RO Relaxed Ordering disabled

7:5 Max Payload Size RW This field sets the maximum TLP payload size for the PI7C9X110 000: 128 bytes 001: 256 bytes 010: 512 bytes 011:1024 bytes 100: 2048 bytes 101: 4096 bytes 110: reserved 111: reserved Reset to 000

8 Extended Tag Field Enable RW Reset to 0

9 Phantom Functions Enable RO Phantom functions not supported

10 Auxiliary Power PM Enable RO Auxiliary power PM not supported

11 No Snoop Enable RO Bridge never sets the No Snoop attribute in the transaction it initiates

14:12 Maximum Read Request Size RW This field sets the maximum Read Request Size for the device as a requester 000: 128 bytes 001: 256 bytes 010: 512 bytes 011: 1024 bytes 100: 2048 bytes 101: 4096 bytes 110: reserved 111: reserved Reset to 2h

15 Configuration Retry Enable RW Reset to 0

7.4.72 DEVICE STATUS REGISTER – OFFSET B8h

BIT FUNCTION TYPE DESCRIPTION

16 Correctable Error Detected RWC Reset to 0

17 Non-Fatal Error Detected RWC Reset to 0

18 Fatal Error Detected RWC Reset to 0

19 Unsupported Request

20 AUX Power Detected RO Reset to 1

21 Transaction Pending RO 0: No transaction is pending on transaction layer interface

1: Transaction is pending on transaction layer interface Reset to 0 31:22 Reserved RO Reset to 0000000000

7.4.73 LINK CAPABILITY REGISTER – OFFSET BCh

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 61 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 3:0 Maximum Link Speed RO Indicates th e maximum speed of the Express link 0001: 2.5Gb/s link Reset to 1 9:4 Maximum Link Width RO Indicates the maximu m width of the Express link (x1 at reset) 000000: reserved 000001: x1 000010: x2 000100: x4 001000: x8 001100: x12 010000: x16 100000: x32 Reset to 000001 11:10 ASPM Support RO This field indicates the level of Active State Power Management Support 00: reserved 01: L0’s entry supported 10: reserved 11: L0’s and L1’s supported Reset to 11 14:12 L0’s Exit Latency RO Reset to 3h 17:15 L1’s Exit Latency RO Reset to 0h 23:18 Reserved RO Reset to 0h 31:24 Port Number RO Reset to 00h

7.4.74 LINK CONTROL REGISTER – OFFSET C0h

BIT FUNCTION TYPE DESCRIPTION 1:0 ASPM Control RW This field controls th e level of ASPM supported on the Express link 00: disabled 01: L0’s entry enabled 10: L1’s entry enabled 11: L0’s and L1’s entry enabled Reset to 00

2 Reserved RO Reset to 0

3 Read Completion Boundary

(RCB) RO Read completion boundary not supported Reset to 0

4 Link Disable RO /

5 Retrain Link RO /

6 Common Clock

7 Extended Sync RW Reset to 0

15:8 Reserved RO Reset to 00h

7.4.75 LINK STATUS REGISTER – OFFSET C0h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 62 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 19:16 Link Speed RO This field indicates the negotiated speed of the Express link 001: 2.5Gb/s link Reset to 1h 25:20 Negotiated Link Width RO 000000: reserved 000001: x1 000010: x2 000100: x4 001000: x8 001100: x12 010000: x16 100000: x32 Reset to 000001

26 Link Train Error RO Reset to 0

27 Link Training RO Reset to 0

28 Slot Clock Configuration RO Reset to 1

31:29 Reserved RO Reset to 0

7.4.76 SLOT CAPABILITY REGISTER – OFFSET C4h

BIT FUNCTION TYPE DESCRIPTION

0 Attention Button Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping.

1 Power Controller Present RO Reset to 0

2 MRL Sensor Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping.

3 Attention Indicator Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping.

4 Power Indicator Present RO 0: If Hot Plug is disabled

1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping.

5 Hot Plug Surprise RO Reset to 0

6 Hot Plug Capable RO 0: If Hot Plug is disabled

1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 14:7 Slot Power Limit Value RO Reset to 00h 16:15 Slot Power Limit Scale RO Reset to 00 18:17 Reserved RO Reset to 00 31:19 Physical Slot Number RO Reset to 0

7.4.77 SLOT CONTROL REGISTER – OFFSET C8h

BIT FUNCTION TYPE DESCRIPTION

0 Attention Button Present

1 Power Fault Detected Enable RW Reset to 0

PCIe-to-PCI Reversible Bridge Page 63 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

2 MRL Sensor Changed

3 Presence Detect Changed

4 Command Completed

5 Hot Plug Interrupt Enable RW Reset to 0

7:6 Attention Indicator Control RW Reset to 0 9:8 Power Indicator Control RW Reset to 0

10 Power Controller Control RW Reset to 0

15:11 Reserved RO Reset to 0

7.4.78 SLOT STATUS REGISTER – OFFSET C8h

BIT FUNCTION TYPE DESCRIPTION

16 Attention Button Pressed RO Reset to 0

17 Power Fault Detected RO Reset to 0

18 MRL Sensor Changed RO Reset to 0

19 Presence Detect Changed RO Reset to 0

20 Command Completed RO Reset to 0

21 MRL Sensor State RO Reset to 0

22 Presence Detect State RO Reset to 0

31:23 Reserved RO Reset to 0

7.4.79 XPIP CONFIGURATION REGISTER 0 – OFFSET CCh

BIT FUNCTION TYPE DESCRIPTION

0 Hot Reset Enable RW Reset to 0

1 Loopback Function Enable RW Reset to 0

2 Cross Link Function Enable RW Reset to 0

3 Software Direct to

Configuration State when in LTSSM state RW Reset to 0

4 Internal Selection for Debug

7:5 Negotiate Lane Number of Times RW Reset to 3h 12:8 TS1 Number Counter RW Reset to 10h 15:13 Reserved RO Reset to 0 31:16 LTSSM Enter L1 Timer Default Value RW Reset to 0400h

7.4.80 XPIP CONFIGURATION REGISTER 1 – OFFSET D0h

BIT FUNCTION TYPE DESCRIPTION 9:0 L0’s Lifetime Timer RW Reset to 0 15:10 Reserved RO Reset to 0 31:16 L1 Lifetime Timer RW Reset to 0

7.4.81 XPIP CONFIGURATION REGISTER 2 – OFFSET D4h

BIT FUNCTION TYPE DESCRIPTION 7:0 CDR Recovery Time (in the number of FTS order sets) RW Reset to 54h A Fast Training Sequence order set composes of one K28.5 (COM) Symbol and three K28.1 Symbols. 14:8 L0’s Exit to L0 Latency RW Reset to 2h

15 Reserved RO Reset to 0

22:16 L1 Exit to L0 Latency RW Reset to 19h

23 Reserved RO Reset to 0

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PCIe-to-PCI Reversible Bridge Page 65 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.82 HOT SWAP SWITCH DEBOUNCE COUNTER – OFFSET D4h

BIT FUNCTION TYPE DESCRIPTION 31:24 Hot Swap Debounce Counter RO / RW If Hot Swap is enabled, this counter is read-write able. This counter is read only (RO) if Hot Swap is disabled 00h: 1ms 01h: 2ms 02h: 3ms 03h: 4ms FFh: 256ms Reset to 0

7.4.83 CAPABILITY ID REGISTER – OFFSET D8h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID for VPD Register RO Reset to 03h

7.4.84 NEXT POINTER REGISTER – OFFSET D8h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer (F0h, points to MSI capabilities) Reset to F0h

7.4.85 VPD REGISTER – OFFSET D8h

BIT FUNCTION TYPE DESCRIPTION 17:16 Reserved RO Reset to 0 23:18 VPD Address for Read/Write Cycle RW Reset to 0 30:24 Reserved RO Reset to 0

31 VPD Operation RW 0: Generate a read cycle fr om the EEPROM at the VPD address specified in

bits [7:2] of offset D8h. This bit remains at ‘0’ until EEPROM cycle is finished, after which the bit is then set to ‘1’. Data for reads is available at register ECh. 1: Generate a write cycle to the EEPROM at the VPD address specified in bits [7:2] of offset D8h. This bit remains at ‘1’ until EEPROM cycle is finished, after which it is then cleared to ‘0’. Reset to 0

7.4.86 VPD DATA REGISTER – OFFSET DCh

BIT FUNCTION TYPE DESCRIPTION 31:0 VPD Data RW VPD Data (EEPROM data [address + 0x40]) The least significant byte of this register corresponds to the byte of VPD at the address specified by the VPD address register. The data read form or written to this register uses the normal PCI byte transfer capabilities. Reset to 0

PCIe-to-PCI Reversible Bridge Page 66 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.87 RESERVED REGISTERS – OFFSET E0h – ECh

7.4.88 MESSAGE SIGNALED INTERRUPTS ID REGISTER – F0h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID for MSI Registers RO Reset to 05h

7.4.89 NEXT CAPABILITIES POINTER REGISTER – F0h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer (00h indicates the end of capabilities) Reset to 00h

7.4.90 MESSAGE CONTROL REGISTER – OFFSET F0h

BIT FUNCTION TYPE DESCRIPTION

16 MSI Enable RW 0: Disable MSI and default to INTx for interrupt

1: Enable MSI for interrupt service and ignore INTx interrupt pins 19:17 Multiple Message Capable RO 000: 1 message requested 001: 2 messages requested 010: 4 messages requested 011: 8 messages requested 100: 16 messages requested 101: 32 messages requested 110: reserved 111: reserved Reset to 000 22:20 Multiple Message Enable RW 000: 1 message requested 001: 2 messages requested 010: 4 messages requested 011: 8 messages requested 100: 16 messages requested 101: 32 messages requested 110: reserved 111: reserved Reset to 000 23 64-bit Address Capable RW Reset to 1 31:24 Reserved RO Reset to 00h

7.4.91 MESSAGE ADDRESS REGISTER – OFFSET F4h

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RO Reset to 00 31:2 System Specified Message Address RW Reset to 0

7.4.92 MESSAGE UPPER ADDRESS REGISTER – OFFSET F8h

BIT FUNCTION TYPE DESCRIPTION 31:0 System Specified Message Upper Address RW Reset to 0

PCIe-to-PCI Reversible Bridge Page 67 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.93 MESSAGE DATA REGISTER – OFFSET FCh

BIT FUNCTION TYPE DESCRIPTION 15:0 System Specified Message Data RW Reset to 0 31:16 Reserved RO Reset to 0

7.4.94 ADVANCE ERROR REPO RTING CAPABILITY ID REGISTER – OFFSET 100h

BIT FUNCTION TYPE DESCRIPTION 15:0 Advance Error Reporting Capability ID RO Reset to 0001h

7.4.95 ADVANCE ERROR REPORT ING CAPABILITY VERSION REGISTER – OFFSET 100h

BIT FUNCTION TYPE DESCRIPTION 19:16 Advance Error Reporting Capability Version RO Reset to 1h

7.4.96 NEXT CAPABILITY OFFS ET REGISTER – OFFSET 100h

BIT FUNCTION TYPE DESCRIPTION 31:20 Next Capability Offset RO Next cap ability offset (150h points to VC capability) Reset to 150h

7.4.97 UNCORRECTABLE ERROR STATUS REGISTER – OFFSET 104h

BIT FUNCTION TYPE DESCRIPTION

0 Training Error Status RWCS Reset to 0

3:1 Reserved RO Reset to 0

4 Data Link Protocol Error

11:5 Reserved RO Reset to 0

12 Poisoned TLP Status RWCS Reset to 0

13 Flow Control Protocol Error

14 Completion Timeout Status RWCS Reset to 0

15 Completer Abort Status RWCS Reset to 0

16 Unexpected Completion

17 Receiver Overflow Status RWCS Reset to 0

18 Malformed TLP Status RWCS Reset to 0

19 ECRC Error Status RWCS Reset to 0

20 Unsupported Request Error

31:21 Reserved RO Reset to 0

7.4.98 UNCORRECTABLE ERROR MASK REGISTER – OFFSET 108h

BIT FUNCTION TYPE DESCRIPTION

0 Training Error Mast RWS Reset to 0

3:1 Reserved RO Reset to 0 11:5 Reserved RO Reset to 0

12 Poisoned TLP Mask RWS Reset to 0

PCIe-to-PCI Reversible Bridge Page 68 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

14 Completion Timeout Mask RWS Reset to 0

15 Completion Abort Mask RWS Reset to 0

17 Receiver Overflow Mask RWS Reset to 0

18 Malformed TLP Mask RWS Reset to 0

19 ECRC Error Mask RWS Reset to 0

31:21 Reserved RO Reset to 0

7.4.99 UNCORRECTABLE ERROR SEVERITY REGISTER – OFFSET 10Ch

BIT FUNCTION TYPE DESCRIPTION

0 Training Error Severity RWS Reset to 1

3:1 Reserved RO Reset to 0 11:5 Reserved RO Reset to 0

12 Poisoned TLP Severity RWS Reset to 0

14 Completion Timeout

15 Completer Abort Seve rity RWS Reset to 0

17 Receiver Overflow Severity RWS Reset to 1

18 Malformed TLP Severity RWS Reset to 1

19 ECRC Error Severity RWS Reset to 0

31:21 Reserved RO Reset to 0

7.4.100 CORRECTABLE ERROR STATUS REGISTER – OFFSET 110h

BIT FUNCTION TYPE DESCRIPTION

0 Receiver Error Status RWCS Reset to 0

5:1 Reserved RO Reset to 0

6 Bad TLP Status RWCS Reset to 0

7 Bad DLLP Status RWCS Reset to 0

8 REPLAY_NUM Rollover

11:9 Reserved RO Reset to 0

12 Replay Timer Timeout

31:13 Reserved RO Reset to 0

7.4.101 CORRECTABLE ERROR MASK REGISTER – OFFSET 114h

BIT FUNCTION TYPE DESCRIPTION

0 Receiver Error Mask RWS Reset to 0

5:1 Reserved RO Reset to 0

6 Bad TLP Mask RWS Reset to 0

7 Bad DLLP Mask RWS Reset to 0

11:9 Reserved RO Reset to 0

12 Replay Timer Timeout Mask RWS Reset to 0

31:13 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 69 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.4.102 ADVANCED ERROR CAPABILITIES AND CONTROL REGISTER – OFFSET 118h

BIT FUNCTION TYPE DESCRIPTION 4:0 First Error Pointer ROS Reset to 0h

5 ECRC Generation Capable RO Reset to 1

6 ECRC Generation Enable RWS Reset to 0

7 ECRC Check Capable RO Reset to 1

8 ECRC Check Enable RWS Reset to 0

31:9 Reserved RO Reset to 0

7.4.103 HEADER LOG REGISTER 1 – OFFSET 11Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 3 ROS Reset to 0 15:8 Header Byte 2 ROS Reset to 0 23:16 Header Byte 1 ROS Reset to 0 31:24 Header Byte 0 ROS Reset to 0

7.4.104 HEADER LOG REGISTER 2 – OFFSET 120h

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 7 ROS Reset to 0 15:8 Header Byte 6 ROS Reset to 0 23:16 Header Byte 5 ROS Reset to 0 31:24 Header Byte 4 ROS Reset to 0

7.4.105 HEADER LOG REGISTER 3 – OFFSET 124h

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 11 ROS Reset to 0 15:8 Header Byte 10 ROS Reset to 0 23:16 Header Byte 9 ROS Reset to 0 31:24 Header Byte 8 ROS Reset to 0

7.4.106 HEADER LOG REGISTER 4 – OFFSET 128h

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 15 ROS Reset to 0 15:8 Header Byte 14 ROS Reset to 0 23:16 Header Byte 13 ROS Reset to 0 31:24 Header Byte 12 ROS Reset to 0

7.4.107 SECONDARY UNCORRECTABLE ERROR STATUS REGISTER – OFFSET 12Ch

BIT FUNCTION TYPE DESCRIPTION

0 Target Abort on Split

1 Master Abort on Split

2 Received Target Abort

3 Received Master Abort

4 Reserved RO Reset to 0

5 Unexpected Split

PCIe-to-PCI Reversible Bridge Page 70 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

6 Uncorrectable Split

7 Uncorrectable Data Error

8 Uncorrectable Attribute

9 Uncorrectable Address Error

10 Delayed Transaction Discard

11 PERR_L Assertion Detected

12 SERR_L Assertion Detected

13 Internal Bridge Error Status RWCS Reset to 0

31:14 Reserved RO Reset to 0

7.4.108 SECONDARY UNCORRECTABLE ERROR MASK REGISTER – OFFSET 130h

BIT FUNCTION TYPE DESCRIPTION

2 Received Target Abort Mask RWS Reset to 0

13 Internal Bridge Error Mask RWS Reset to 0

31:14 Reserved RO Reset to 0

7.4.109 SECONDARY UNCORRECTABLE ERROR SEVERITY REGISTER – OFFSET 134h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 71 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

13 Internal Bridge Error

31:14 Reserved RO Reset to 0

7.4.110 SECONDARY ERROR CAPABILITY AND CONTROL REGISTER – OFFSET 138h

BIT FUNCTION TYPE DESCRIPTION 4:0 Secondary First Error Pointer ROW Reset to 0 31:5 Reserved RO Reset to 0

7.4.111 SECONDARY HEADER LOG REGISTER – OFFSET 13Ch – 148h

BIT FUNCTION TYPE DESCRIPTION 35:0 Transaction Attribute ROS Tran saction attribute, CBE [3:0] and AD [31:0] during attribute phase Reset to 0 39:36 Transaction Command Lower ROS Transaction command lower, CBE [3:0] during first address phase Reset to 0 43:40 Transaction Command Upper ROS Transaction command upper, CBE [3 :0] during second address phase of DAC transaction Reset to 0 63:44 Reserved ROS Reset to 0 95:64 Transaction Address ROS Transaction addr ess, AD [31:0] during first address phase Reset to 0 127:96 Transaction Address ROS Transaction addres s, AD [31:0] during second address phase of DAC transaction Reset to 0

7.4.112 RESERVED REGISTER – OFFSET 14Ch

7.4.113 VC CAPABILITY ID REGISTER – OFFSET 150h

BIT FUNCTION TYPE DESCRIPTION 15:0 VC Capability ID RO Reset to 0002h

7.4.114 VC CAPABILITY VERSION REGISTER – OFFSET 150h

PCIe-to-PCI Reversible Bridge Page 72 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 19:16 VC Capability Version RO Reset to 1h

7.4.115 NEXT CAPABILITY OFFSET REGISTER – OFFSET 150h

BIT FUNCTION TYPE DESCRIPTION 31:20 Next Capability Offset RO Next capability offset – the end of capabilities Reset to 0

7.4.116 PORT VC CAPABILITY REGISTER 1 – OFFSET 154h

BIT FUNCTION TYPE DESCRIPTION 2:0 Extended VC Count RO Reset to 0 6:4 Low Priority Extended VC Count RO Reset to 0

7 Reserved RO Reset to 0

9:8 Reference Clock RO Reset to 0 11:10 Port Arbitration Table Entry Size RO Reset to 0 31:12 Reserved RO Reset to 0

7.4.117 PORT VC CAPABILITY REGISTER 2 – OFFSET 158h

BIT FUNCTION TYPE DESCRIPTION 7:0 VC Arbitration Capability RO Reset to 0 23:8 Reserved RO Reset to 0 31:24 VC Arbitration Table Offset RO Reset to 0

7.4.118 PORT VC CONTROL REGISTER – OFFSET 15Ch

BIT FUNCTION TYPE DESCRIPTION

0 Load VC Arbitration Table RO Reset to 0

3:1 VC Arbitration Select RO Reset to 0 15:4 Reserved RO Reset to 0

7.4.119 PORT VC STATUS REGISTER – OFFSET 15Ch

BIT FUNCTION TYPE DESCRIPTION

16 VC Arbitration Table Status RO Reset to 0

31:17 Reserved RO Reset to 0

7.4.120 VC0 RESOURCE CAPABILITY REGISTER – OFFSET 160h

BIT FUNCTION TYPE DESCRIPTION 7:0 Port Arbitration Capability RO Reset to 0 13:8 Reserved RO Reset to 0

14 Advanced Packet Switching RO Reset to 0

15 Reject Snoop Transactions RO Reset to0

22:16 Maximum Time Slots RO Reset to 0 31:24 Port Arbitration Table Offset RO Reset to 0

7.4.121 VC0 RESOURCE CONTROL REGISTER – OFFSET 164h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 73 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

0 TC / VC Map RO For TC0

7:1 TC / VC Map RW For TC7 to TC1 Reset to 7Fh 15:8 Reserved RO Reset to 0

16 Load Port Arbitration Table RO Reset to 0

19:17 Port Arbitration Select RO Reset to 0 23:20 Reserved RO Reset to 0 26:24 VC ID RO Reset to 0 30:27 Reserved RO Reset to 0

31 VC Enable RO Reset to 1

7.4.122 VC0 RESOURCE STATUS REGISTER – OFFSET 168h

BIT FUNCTION TYPE DESCRIPTION

0 Port Arbitration Table 1 RO Reset to 0

1 VC0 Negotiation Pending RO Reset to 0

31:2 Reserved RO Reset to 0

7.4.123 RESERVED REGISTERS – OFFSET 16Ch – 300h

7.4.124 EXTRA GPI/GPO DATA AND CONTROL REGISTER – OFFSET 304h

BIT FUNCTION TYPE DESCRIPTION 3:0 Extra GPO RWC GPO [3:0], write 1 to clear Reset to 0 7:4 Extra GPO RWS GPO [3:0], write 1 to set Reset to 0 11:8 Extra GPO enable RWC GPO [3 :0] enable, write 1 to clear Reset to 0 15:12 Extra GPO enable RWS GPO [3:0] enable, write 1 to set Reset to 0 19:16 Extra GPI RO Extra GPI [3:0] Data Register Reset to 0 31:20 Reserved RO Reset to 0

7.4.125 RESERVED REGISTERS – OFFSET 308h – 30Ch

7.4.126 REPLAY AND ACKNOWLEDGE LATENCY TIMERS – OFFSET 310h

BIT FUNCTION TYPE DESCRIPTION 11:0 Replay Timer RW Replay Timer Reset to 0

12 Replay Timer Enable RW Replay Timer Enable

15:13 Reserved RO Reset to 0 29:16 Acknowledge Latency Timer RW Acknowledge Latency Timer Reset to 0

30 Acknowledge Latency Timer

RO Acknowledge Latency Timer Enable Reset to 0

7.4.127 RESERVED REGISTERS – OFFSET 314h – FFCh

PCIe-to-PCI Reversible Bridge Page 74 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5 PCI CONFIGURATION REGISTER S FOR NON-TRANSPARENT BRIDGE

The following section describes the configuration space when the device is in non-transparent bridge mode. The descriptions for different register type are listed as follow: Register Type Descriptions RO Read Only ROS Read Only and Sticky RW Read/Write RWC Read/Write “1” to clear RWS Read/Write and Sticky RWCS Read/Write “1” to clear and Sticky

7.5.1 VENDOR ID – OFFSET 00h

BIT FUNCTION TYPE DESCRIPTION 15:0 Vendor ID RO Identifies Pericom as the vendor of this device. Returns 12D8h when read.

7.5.2 DEVICE ID – OFFSET 00h

BIT FUNCTION TYPE DESCRIPTION 31:16 Device ID RO Identifies this device as the PI7C9X110. Returns E110 when read.

7.5.3 COMMAND REGISTER – OFFSET 04h

BIT FUNCTION TYPE DESCRIPTION 1: Enable response to memory transactions on the primary interface Reset to 0 1: Enable memory read transactions on the primary interface Reset to 0 disable response to memory and I/O transactions on the secondary interface 1: Enable the bridge to operate as a master on the primary interfaces for memory and I/O transactions forwarded from the secondary interface. If the primary of the reverse bridge is PCI-X mode, the bridge is allowed to initiate a split completion transaction regardless of the status bit. Reset to 0 this bit is defined as Read-Only and must return 0 when read Reset to 0 RO 0: PI7C9X110 does not originate a Memory Write and Invalidate transaction. Implements this bit as Read-Only and returns 0 when read (unless forwarding a transaction for another master). This bit will be ignored in PCI-X mode. Reset to 0 This bit applies to reverse bridge only. 0: Ignore VGA palette access on the primary 1: Enable positive decoding response to VGA palette writes on the primary interface with I/O address bits AD [9:0] equal to 3C6h, 3C8h, and 3C9h (inclusive of ISA alias; AD [15:0] are not decoded and may be any value)

PCIe-to-PCI Reversible Bridge Page 75 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION Reset to 0 RW 0: May ignore any parity error that is detected and take its normal action 1: This bit if set, enables the setting of Master Data Parity Error bit in the Status Register when poisoned TLP received or parity error is detected and takes its normal action Reset to 0 1: Enable PI7C9X110 in forward bridge mode to report non-fatal or fatal error message to the Root Complex. Also, in reverse bridge mode to assert SERR_L on the primary interface Reset to 0 This bit applies to reverse bridge only. 0: INTA_L, INTB_L, INTC_L, and INTD_L can be asserted on PCI interface 1: Prevent INTA_L, INTB_L, INTC_L, and INTD_L from being asserted on PCI interface Reset to 0 15:11 Reserved RO Reset to 00000

7.5.4 PRIMARY STATUS REGISTER – OFFSET 04h

BIT FUNCTION TYPE DESCRIPTION 18:16 Reserved RO Reset to 000

19 Primary Interrupt Status RO 0: No INTx inte rrupt message request pending in PI7C9X110 primary

1: INTx interrupt message request pending in PI7C9X110 primary Reset to 0 20 Capability List Capable RO 1: PI7C9X110 supports the capability list (offset 34h in the pointer to the data structure) Reset to 1 21 66MHz Capable RO This bit applies to reverse bridge only. 1: 66MHz capable Reset to 0 when forward bridge or 1 when reverse bridge. 23 Fast Back-to-Back Capable RO This bit applies to reverse bridge only. 1: Enable fast back-to-back transactions Reset to 0 when forward bridge or 1 when reverse bridge with primary bus in PCI mode

PCIe-to-PCI Reversible Bridge Page 76 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION RWC Bit set if its Parity Erro r Enable bit is set and either of the conditions occurs on the primary: FORWARD BRIDGE –

• Receives a completion marked poisoned
• Poisons a write request REVERSE BRIDGE –
• Detected parity error when receiving data or Split Response for read
• Observes P_PERR_L asserted when sending data or receiving Split Response for write
• Receives a Split Completion Message indicating data parity error occurred for non-posted write Reset to 0 26:25 DEVSEL_L Timing (medium decode) RO These bits apply to reverse bridge only. 00: fast DEVSEL_L decoding 01: medium DEVSEL_L decoding 10: slow DEVSEL_L decoding 11: reserved Reset to 00 when forward bridge or 01 when reverse bridge.

This bit is set when PI7C9X110 completes a request using completer abort status on the primary REVERSE BRIDGE – This bit is set to indicate a target abort on the primary Reset to 0 This bit is set when bridge receives a completion with completer abort completion status on the primary REVERSE BRIDGE – This bit is set when PI7C9X110 detects a target abort on the primary Reset to 0 This bit is set when PI7C9X110 receives a completion with unsupported request completion status on the primary REVERSE BRIDGE – This bit is set when PI7C9X110 detects a master abort on the primary This bit is set when PI7C9X110 sends an ERR_FATAL or ERR_NON_FATAL message on the primary REVERSE BRIDGE – This bit is set when PI7C9X110 asserts SERR_L on the primary Reset to 0 This bit is set when poisoned TLP is detected on the primary REVERSE BRIDGE – This bit is set when address or data parity error is detected on the primary Reset to 0

7.5.5 REVISION ID REGISTER – OFFSET 08h

BIT FUNCTION TYPE DESCRIPTION 7:0 Revision RO Reset to 00000002h

7.5.6 CLASS CODE REGISTER – OFFSET 08h

PCIe-to-PCI Reversible Bridge Page 77 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 15:8 Programming Interface RO Subtractive d ecoding of PCI-PCI bridge not supported Reset to 00000000 23:16 Sub-Class Code RO Sub-Class Code 10000000: Other bridge Reset to 10000000 31:24 Base Class Code RO Base class code 00000110: Bridge Device (transparent mode) Reset to 00000110 (transparent mode

7.5.7 CACHE LINE SIZE REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RO Bit [1:0] not supported Reset to 00 7:6 Reserved RO Bit [7:6] not supported Reset to 00

7.5.8 PRIMARY LATENCY TIMER REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Primary Latency Timer RO / RW 8 bits of primary latency timer in PCI/PCI-X FORWARD BRIDGE – RO with reset to 00h REVERSE BRIDGE – RW with reset to 00h in PCI mode or 40h in PCI-X mode

7.5.9 PRIMARY HEADER TYPE REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 22:16 Other bridge configuration (non-transparent mode) RO Type-0 header format configuration (10-3Fh) Reset to 0000000 (non-transparent mode) 31:24 Reserved RO Reset to 00h

7.5.10 PRIMARY CSR AND MEMORY 0 BASE ADDRESS REGISTER – OFFSET 10h

BIT FUNCTION TYPE DESCRIPTION

0 Space Indicator RO 0: Memory space

1: IO space

PCIe-to-PCI Reversible Bridge Page 78 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01: 64-bit address decode range 10 and 11: reserved Reset to 00

3 Prefetchable control RO 0: Memory space is non-prefetchable

1: Memory space is prefetchable Reset to 0 11:4 Reserved RO Reset to 0 31:12 Base Address RW/RO The size and type of th is Base Address Register are defined from Downstream Memory 0 Setup Register (Offset 9Ch), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. The range of this register is from 4KB to 2GB. The lower 4KB if this address reange map to the PI7C9X110 CSRs into memory space. The remaining space is this range above 4KB, if any, specifies a range for forwarding downstream memory transactions. PI7X9X110 uses downstream Memory 0 Translated Base Register (Offset 98h) to formulate direct address translation. If a bit in the setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000h

7.5.11 PRIMARY CSR I/O BASE ADDRESS REGISTER – OFFSET 14h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 1 7:1 Reserved RO Reset to 0 31:8 Base Address RO/RW This Base Address Regi ster maps to PI7C9X110 primary IO space. The maximum size is 256 bytes. Reset to 00000000h

7.5.12 DOWNSTREAM I/O OR MEMORY 1 BASE ADDRESS REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01: 64-bit address decode range 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 11:4 Reserved RO Reset to 0 31:12 Base Address RW/RO The size and type of th is Base Address Register are defined from Downstream IO or Memory 1 Setup Register (Offset ACh), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup register to disable this register. The range of this register is from 4KB to 2GB for memory space or from 64B to 256B for IO space. PI7X9X110 uses downstream IO or Memory 1 Translated Base Re gister (Offset A8h) to formulate direct address translation. If a bit in the

PCIe-to-PCI Reversible Bridge Page 79 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000h

7.5.13 DONWSTREAM MEMORY 2 BASE ADDRESS REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01, 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 11:4 Reserved RO Reset to 0 31:12 Base Address RW/RO The size and type of th is Base Address Register are defined from Downstream Memory 2 Setup Register (CSR Offset 00Ch), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup register to disable this register. The range of this register is from 4KB to 2GB for memory space. PI7X9X110 uses downstream Memory 2 Translated Base Register (CSR Offset 008h) to formulate direct address translation. If a bit in the setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000h

7.5.14 DOWNSTREAM MEMORY 3 BASE ADDRESS REGISTER – OFFSET 20h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01: 64-bit address decode range 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 11:4 Reserved RO Reset to 0 31:12 Base Address RW/RO The size and type of th is Base Address Register are defined from Downstream Memory 3 Setup Register (CSR Offset 014h), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup registers (CSR Offset 014h and 018h) to disable this register. The range of this register is from 4KB to 9EB for memory space. PI7C9X110 uses Memory 3 Translated Base Register (CSR Offset 010h) to formulate direct address translation when 32-bit addressing programmed. When 64-bit addressing programmed, no address translation is performed. If a bit in the setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000h

PCIe-to-PCI Reversible Bridge Page 80 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.15 DOWNSTREAM MEMORY 3 UPPER BASE ADDRESS REGISTER – OFFSET 24h

BIT FUNCTION TYPE DESCRIPTION 31:0 Base address RO/RW The size of this Base Addr ess Register is defined from Downstream Memory

3 Upper 32-bit Setup Register (CSR Offset 018h), which can be initialized by

EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup registers (CSR Offset 018h) to disable this register. This register defines the upper 32 bits of a memory range for downstream forwarding memory. If a bit in the setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000000h

7.5.16 RESERVED REGISTER – OFFSET 28h

7.5.17 SUBSYTEM ID AND SUBSYSTEM VENDOR ID REGISTER – OFFSET 2Ch

BIT FUNCTION TYPE DESCRIPTION 15:0 Subsystem Vendor ID RO Identify the ve ndor ID for add-in card or subsystem Reset to 0000h 31:16 Subsystem ID RO Identify the vendor speci fic device ID for add-in card or subsystem Reset to 0000h

7.5.18 RESERVED REGISTER – OFFSET 30h

7.5.19 CAPABILITY POINTER – OFFSET 34h

BIT FUNCTION TYPE DESCRIPTION 31:8 Reserved RO Reset to 0 7:0 Capability Pointer RO Capability pointer to 80h Reset to 80h

7.5.20 EXPANSION ROM BASE ADDRESS REGISTER – OFFSET 38h

BIT FUNCTION TYPE DESCRIPTION 31:0 Expansion ROM Base Address RO Expansion ROM not supported. Reset to 00000000h

7.5.21 PRIMARY INTERRUPT LINE REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Primary Interrupt Line RW These bits apply to reverse bridge only. For initialization code to program to tell which input of the interrupt controller the PI7C9X110’s INTA_L in connected to. Reset to 00000000

7.5.22 PRIMARY INTERRUPT PIN REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 81 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 15:8 Primary Interrupt Pin RO These bits apply to reverse bridge only. Designates interrupt pin INTA_L, is used Reset to 00h when forward mode or 01h when reverse mode.

7.5.23 PRIMARY MINIMUM GRANT REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 23:16 Primary Minimum Grant RO This register is valid only in reverse bridge mode. It specifies how long of a burst period that PI7C9X110 needs on the primary bus in the units of ¼ microseconds. Reset to 0

PCIe-to-PCI Reversible Bridge Page 82 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.24 PRIMARY MAXIMUM LATENCY TIME REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 31:24 Primary Maximum Latency Timer RO This register is valid only in reverse bridge mode. It specifies how often that PI7C9X110 needs to gain access to the primary bus in units of ¼ microseconds. Reset to 0

7.5.25 PCI DATA BUFFERING CO NTROL REGISTER – OFFSET 40h

BIT FUNCTION TYPE DESCRIPTION RW 0: Park to the last master 1: Park to PI7C9X110 secondary port Reset to 0 RW 0: Enable memory read prefetchi ng dynamic control for PCI to PCIe read 1: Disable memory read prefetching dynamic control for PCI to PCIe read Reset to 0 RW 0: Enable completion data pr ediction for PCI to PCIe read. 1: Disable completion data prediction Reset to 0 5:4 PCI Read Multiple Prefetch Mode RW These two bits are ignored in PCI-X mode. 00: One cache line prefetch if memory read multiple address is in prefetchable range at the PCI interface 01: Full prefetch if address is in prefetchable range at PCI interface, and the PI7C9X110 will keep remaining data after it disconnects the external master during burst read with read multiple command until the discard timer expires 10: Full prefetch if address is in prefetchable range at PCI interface 11: Full prefetch if address is in prefetchable range at PCI interface and the PI7C9X110 will keep remaining data after the read multiple is terminated either by an external master or by the PI7C9X110, until the discard time expires Reset to 10 7:6 PCI Read Line Prefetch Mode RW These two bits are ignored in PCI-X mode. 00: Once cache line prefetch if memory read address is in prefetchable range at PCI interface 01: Full prefetch if address is in prefetchable range at PCI interface and the PI7C9X110 will keep remaining data after it is disconnected by an external master during burst read with read line command, until discard timer expires 10: Full prefetch if memory read line address is in prefetchable range at PCI interface 11: Full prefetch if address is in prefetchable range at PCI interface and the PI7C9X110 will keep remaining data after the read line is terminated either by an external master or by the PI7C9X110, until the discard timer expires Reset to 00

PCIe-to-PCI Reversible Bridge Page 83 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 9:8 PCI Read Prefetch Mode RW 00: One cache line prefet ch if memory read address is in prefetchable range at PCI interface 01: Reserved 10: Full prefetch if memory read address is in prefetchable range at PCI interface 11: Disconnect on the first DWORD Reset to 00 RW 0: Retry any master at PCI bus that repeats its transaction with command code changes. 1: Allows any master at PCI bus to change memory command code (MR, MRL, MRM) after it has received a retry. The PI7C9X110 will complete the memory read transaction and return data back to the master if the address and byte enables are the same. Reset to 0 14:12 Maximum Memory Read Byte Count RW Maximum byte count is used by the PI7C9X110 when generating memory read requests on the PCIe link in response to a memory read initiated on the PCI bus and bit [9:8], bit [7:6], and bit [5:4] are set to “full prefetch”. 000: 512 bytes (default) 001: 128 bytes 010: 256 bytes 011: 512 bytes 100: 1024 bytes 101: 2048 bytes 110: 4096 bytes 111: 512 bytes Reset to 000

7.5.26 CHIP CONTROL 0 REGISTER – OFFSET 40h

BIT FUNCTION TYPE DESCRIPTION RW 0: Flow control is updated for every two credits available 1: Flow control is updated for every on credit available Reset to 0 1: The PCI retry counter has expired since the last reset Reset to 0 18:17 PCI Retry Counter Control RW 00: No expiration limit 01: Allow 256 retries before expiration 10: Allow 64K retries before expiration 11: Allow 2G retries before expiration Reset to 00 (bridge control register) 1: Disable the PCI discard timer in conjunction with bit [27] offset 3Ch (bridge control register) Reset to 0

PCIe-to-PCI Reversible Bridge Page 84 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION RW 0: Use bit [24] offset 3Ch for forward bridge or bit [25] offset 3Ch for reverse bridge to indicate how many PCI clocks should be allowed before the PCI discard timer expires 1: 64 PCI clocks allowed before the PCI discard timer expires Reset to 0 22:21 Configuration Request Retry Timer Counter Value Control RW 00: Timer expires at 25us 01: Timer expires at 0.5ms 10: Timer expires at 5ms 11: Timer expires at 25ms Reset to 01 RW 0: Enable out-of-order capability between delayed transactions 1: Disable out-of-order capability between delayed transactions Reset to 0 25:24 Completion Timer Counter Value Control RW 00: Timer expires at 50us 01: Timer expires at 10ms 10: Timer expires at 50ms 11: Timer disabled Reset to 01 RW 0: All memory transactions from PCI-X to PCIe will be mapped to TC0 1: All memory transactions from PCI-X to PCIe will be mapped to Traffic Class defined in bit [29:27] of offset 40h. Reset to 0 29:27 Traffic Class Used For Isochronous Traffic RW Reset to 001 0: Normal mode 1: Enable serial link interface loopback mode (TX to RX) if TM0=LOW, TM1=HIGH, TM2=HIGH, MSK_IN=HIGH, REVRSB=HIGH. PCI transaction from PCI bus will loop back to PCI bus RO for forward bridge Reset to 0 0: PI7C9X110 configuration space can be accessed from both interfaces 1: PI7C9X110 configuration space can only be accessed from the secondary interface. Primary bus accessed receives completion with CRS status for forward bridge, or target retry for reverse bridge Reset to 0 if TM0 is LOW

7.5.27 SECONDARY COMMAND REGISTER – OFFSET 44h

BIT FUNCTION TYPE DESCRIPTION

0 I/O Space Enable RW 0: Ignore I/O transactions on the secondary interface

1: Enable response to memory transactions on the secondary interface Reset to 0

1 Memory Space Enable RW 0: Ignore memory read transactions on the secondary interface

1: Enable memory read transactions on the secondary interface Reset to 0

PCIe-to-PCI Reversible Bridge Page 85 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

2 Bus Master Enable RW 0: Do not initiate memory or I/O transactions on the secondary interface and

disable response to memory and I/O transactions on the secondary interface 1: Enable the PI7C9X110 to operate as a master on the secondary interfaces for memory and I/O transactions forwarded from the secondary interface. If the secondary of the reverse bridge is PCI-X mode, the PI7C9X110 is allowed to initiate a split completion transaction regardless of the status bit. Reset to 0

3 Special Cycle Enable RO 0: Bridge does not respond as a target to Special Cycle transactions, so this

bit is defined as Read-Only and must return 0 when read Reset to 0 RO 0: PI7C9X110 does not originate a Memory Write and Invalidate transaction. Implements this bit as Read-Only and returns 0 when read (unless forwarding a transaction for another master). This bit will be ignored in PCI-X mode. Reset to 0

5 VGA Palette Snoop Enable RO 0: Ignor e VGA palette snoop access on the secondary

RW 0: May ignore any parity error that is detected and take its normal action 1: This bit if set, enables the setting of Master Data Parity Error bit in the Status Register when poisoned TLP received or parity error is detected and takes its normal action Reset to 0

8 Secondary SERR_L Enable

RW 0: Disable 1: Enable PI7C9X110 in forward bridge mode to report non-fatal or fatal error message to the Root Complex. Also, in reverse bridge mode to assert SERR_L on the secondary interface Reset to 0

10 Secondary Interrupt Disable RO /

0: INTx interrupt messages can be generated 1: Prevent INTx messages to be generated and any asserted INTx interrupts will be released. Reset to 0 15:11 Reserved RO Reset to 00000

7.5.28 SECONDARY STATUS REGISTER – OFFSET 44h

BIT FUNCTION TYPE DESCRIPTION 18:16 Reserved RO Reset to 000

19 Secondary Interrupt Status RO 0: No INTx inte rrupt message request pending in PI7C9X110 secondary

1: INTx interrupt message request pending in PI7C9X110 secondary Reset to 0 20 Capability List Capable RO 1: PI7C9X110 supports the capability list (offset 34h in the pointer to the data structure) Reset to 1

PCIe-to-PCI Reversible Bridge Page 86 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 21 66MHz Capable RO This bit applies to forward bridge only. 1: 66MHz capable Reset to 0 when reverse bridge or 1 when forward bridge. 23 Fast Back-to-Back Capable RO This bit applies to forward bridge only. 1: Enable fast back-to-back transactions Reset to 0 when reverse bridge or 1 when forward bridge with secondary bus in PCI mode RWC Bit set if its Parity Erro r Enable bit is set and either of the conditions occurs on the secondary: REVERSE BRIDGE –

• Receives a completion marked poisoned
• Poisons a write request FORWARD BRIDGE –
• Detected parity error when receiving data or Split Response for read
• Observes P_PERR_L asserted when sending data or receiving Split Response for write
• Receives a Split Completion Message indicating data parity error occurred for non-posted write Reset to 0 26:25 DEVSEL_L Timing (medium decode) RO These bits apply to forward bridge only. 00: fast DEVSEL_L decoding 01: medium DEVSEL_L decoding 10: slow DEVSEL_L decoding 11: reserved Reset to 00 when reverse bridge or 01 when forward bridge.

27 Signaled Target Abort RWC REVERSE BRIDGE –

This bit is set when PI7C9X110 completes a request using completer abort status on the secondary FORWARD BRIDGE – This bit is set to indicate a target abort on the secondary Reset to 0

28 Received Target Abort RWC REVERSE BRIDGE –

This bit is set when bridge receives a completion with completer abort completion status on the secondary FORWARD BRIDGE – This bit is set when PI7C9X110 detects a target abort on the secondary Reset to 0

29 Received Master Abort RWC REVERSE BRIDGE –

This bit is set when PI7C9X110 receives a completion with unsupported request completion status on the secondary FORWARD BRIDGE – This bit is set when PI7C9X110 detects a master abort on the secondary

30 Signaled System Error RWC REVERSE BRIDGE –

This bit is set when PI7C9X110 sends an ERR_FATAL or ERR_NON_FATAL message on the secondary FORWARD BRIDGE – This bit is set when PI7C9X110 asserts SERR_L on the secondary Reset to 0

PCIe-to-PCI Reversible Bridge Page 87 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

31 Detected Parity Error RWC REVERSE BRIDGE –

This bit is set when poisoned TLP is detected on the secondary FORWARD BRIDGE – This bit is set when address or data parity error is detected on the secondary Reset to 0

7.5.29 ARBITER ENABLE REGISTER – OFFSET 48h

BIT FUNCTION TYPE DESCRIPTION

0 Enable Arbiter 0 RW 0: Disable arb itration for internal PI7C9X110request

1: Enable arbitration for internal PI7C9X110 request Reset to 1 1: Enable arbitration for master 1 Reset to 1 1: Enable arbitration for master 2 Reset to 1 1: Enable arbitration for master 3 Reset to 1 1: Enable arbitration for master 4 Reset to 1 1: Enable arbitration for master 5 Reset to 1 1: Enable arbitration for master 6 Reset to 1 1: Enable arbitration for master 7 Reset to 1 1: Enable arbitration for master 8 Reset to 1

7.5.30 ARBITER MODE REGISTER – OFFSET 48h

BIT FUNCTION TYPE DESCRIPTION 1: Use external arbiter (if CFN_L is tied HIGH) Reset to 0/1 according to what CFN_L is tied to RW 0: Broken master timeout disable 1: This bit enables the internal arbiter to count 16 PCI bus cycles while waiting for FRAME_L to become active when a device’s PCI bus GNT is active and the PCI bus is idle. If the broken master timeout expires, the PCI bus GNT for the device is de-asserted. Reset to 0

PCIe-to-PCI Reversible Bridge Page 88 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION RW 0: A broken master will be ignored forever after de-asserting its REQ_L for at least 1 clock 1: Refresh broken master state after all the other masters have been served once Reset to 0 19:12 Arbiter Fairness Counter RW 08h: These bits are the initialization value of a counter used by the internal arbiter. It controls the number of PCI bus cycles that the arbiter holds a device’s PCI bus GNT active after detecting a PCI bus REQ_L from another device. The counter is reloaded whenever a new PCI bus GNT is asserted. For every new PCI bus GNT, the counter is armed to decrement when it detects the new fall of FRAME_L. If the arbiter fairness counter is set to 00h, the arbiter will not remove a device’s PCI bus GNT until the device has de- asserted its PCI bus REQ. Reset to 08h RW 0: GNT_L not de-asserted afte r granted master assert FRAME_L 1: GNT_L de-asserts for 1 clock after 2 clocks of the granted master asserting FRAME_L Reset to 0

7.5.31 ARBITER PRIORITY REGISTER – OFFSET 48h

BIT FUNCTION TYPE DESCRIPTION 1: High priority request to internal PI7C9X110 Reset to 1 1: High priority request to master 1 Reset to 0 1: High priority request to master 2 Reset to 0 1: High priority request to master 3 Reset to 0 1: High priority request to master 4 Reset to 0 1: High priority request to master 5 Reset to 0 1: High priority request to master 6 Reset to 0 1: High priority request to master 7 Reset to 0

PCIe-to-PCI Reversible Bridge Page 89 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 1: High priority request to master 8 Reset to 0

7.5.32 SECONDARY CACHE LINE SIZE REGISTER – OFFSET 4Ch

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RO 00: Cache line size of 1 DW and 2 DW are not supported Reset to 00 7:6 Reserved RO Bit [7:6] not supported Reset to 00

7.5.33 SECONDARY LATENCY TIME REGISTER – OFFSET 4Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Secondary Latency Timer RO / RW 8 bits of secondary latency timer in PCI/PCI-X REVERSE BRIDGE – RO with reset to 00h FORWARD BRIDGE – RW with reset to 00h in PCI mode or 40h in PCI-X mode

7.5.34 SECONDARY HEADER TYPE REGISTER – OFFSET 4Ch

BIT FUNCTION TYPE DESCRIPTION 22:16 Other Bridge Configurati on RO Type-0 header format configuration (10 – 3Fh) Reset to 0000000 31:24 Reserved RO Reset to 00h

7.5.35 SECONDARY CSR AND MEMORY 0 BA SE ADDRESS REGISTER – OFFSET 50h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0

PCIe-to-PCI Reversible Bridge Page 90 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO 00: 32- bit address decode range 01: 64-bit address decode range 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 11:4 Reserved RO Reset to 0 31:12 Base Address RW/RO The size and type of this Base Address Register are defined from Upstream Memory 0 Setup Register (Offset E4h), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. The range of this register is from 4KB to 2GB. The lower 4KB if this address reange map to the PI7C9X110 CSRs into memory space. The remaining space is this range above 4KB, if any, specifies a range for forwarding upstream memory transactions. PI7X9X110 uses upstream Memory 0 Translated Base Register (Offset E0h) to formulate direct address translation. If a bit in the setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000h

7.5.36 SECONDARY CSR I/O BASE ADDRESS REGISTER – OFFSET 54h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 1 7:1 Reserved RO Reset to 0 31:8 Base Address RO/RW This Base Address Register maps to PI7C9X110 secondary IO space. The maximum size is 256 bytes. Reset to 00000000h

7.5.37 UPSTREAM I/O OR MEMORY 1 BA SE ADDRESS REGISTER – OFFSET 58h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01: 64-bit address decode range 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 5:4 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 91 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:6 Base Address RW/RO The size and type of this Base Address Register are defined from Upstream IO or Memory 1 Setup Register (Offset ECh), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup register to disable this register. The range of this register is from 4KB to 2GB for memory space or from 64B to 256B for IO space. PI7X9X110 uses upstream IO or Memory 1 Translated Base Register (Offset E8h) to formulate direct address translation. If a bit in the setup register is set to one, then the correspondent bit of this register will be changed to RW. Reset to 00000h

7.5.38 UPSTREAM MEMORY 2 BASE ADDRESS REGISTER – OFFSET 5Ch

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01, 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 13:4 Reserved RO Reset to 0 31:14 Base Address RW/RO This Base Address regist er defines the address range for upstream memory transactions. PI7C9X110 uses a lookup table to do the address translation. The address range of this register is from 16KB to 2GB in memory space. The address range is divided into 64 pages. The size of each page is defined by Memory Address Forwarding Control register (Offset 6Ah), which is initialized by EEPROM (I2C) or SM Bus or local processor. Writing a zero to the bit [0] of the look up table entry can disable the corresponding page of this register (CSR Offset 1FFh: 100h). The number of writeable bit may change depending on the page size setup. Reset to 00000h

7.5.39 UPSTREAM MEMORY 3 BASE ADDRESS REGISTER – OFFSET 60h

BIT FUNCTION TYPE DESCRIPTION 1: IO space Reset to 0 2:1 Address Type RO 00: 32- bit address decode range 01: 64-bit address decode range 10 and 11: reserved Reset to 00 1: Memory space is prefetchable Reset to 0 11:4 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 92 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:12 Base Address RW/RO The size and type of this Base Address Register are defined from Upstream Memory 3 Setup Register (CSR Offset 034h), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup registers (CSR Offset 034h and 038h) to disable this register. The range of this register is from 4KB to 9EB for memory space. PI7C9X110 uses this register and the Upstream Memory 3 Upper Base Address Register when 64-bit addressing programmed (bit [21] of Offset 68h). When 64-bit addressing is disabled, no address translation is performed. All 64-bit address transactions on the secondary interface falling outside of the Downstream Memory 3 address range are forwarded upstream. Reset to 00000h

PCIe-to-PCI Reversible Bridge Page 93 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.40 UPSTREAM MEMORY 3 UPPER BA SE ADDRESS REGISTER – OFFSET 64h

BIT FUNCTION TYPE DESCRIPTION 31:0 Base address RO/RW The size of this Base Addr ess Register is defined from Upstream Memory 3 Upper 32-bit Setup Register (CSR Offset 038h), which can be initialized by EEPROM (I2C) or SM Bus or Local Processor. Writing a zero to bit [31] of the setup registers (CSR Offset 038h) to disable this register. This register defines the upper 32 bits of a memory range for upstream forwarding memory. PI7C9X110 uses this register and the Upstream Memory 3 Base Address Register when 64-bit addressing programmed (bit [21] of Offset 68h). When 64-bit addressing is disabled, no address translation is performed. All 64-bit address transactions on the secondary interface falling outside of the Downstream Memory 3 address range are forwarded upstream. Reset to 00000000h

7.5.41 EXPRESS TRANSMITTER/RECEIVER REGISTER – OFFSET 68h

BIT FUNCTION TYPE DESCRIPTION 1:0 Nominal Driver Current Control RW 00: 20mA 01: 10mA 10: 28mA 11: Reserved Reset to 00 5:2 Driver Current Scale Multiple Control RW 0000: 1.00 x nominal driver current 0001: 1.05 x nominal driver current 0010: 1.10 x nominal driver current 0011: 1.15 x nominal driver current 0100: 1.20 x nominal driver current 0101: 1.25 x nominal driver current 0110: 1.30 x nominal driver current 0111: 1.35 x nominal driver current 1000: 1.60 x nominal driver current 1001: 1.65 x nominal driver current 1010: 1.70 x nominal driver current 1011: 1.75 x nominal driver current 1100: 1.80 x nominal driver current 1101: 1.85 x nominal driver current 1110: 1.90 x nominal driver current 1111: 1.95 x nominal driver current Reset to 0000 11:8 Driver De-emphasis Level Control RW 0000: 0.00 db 0001: -0.35 db 0010: -0.72 db 0011: -1.11 db 0100: -1.51 db 0101: -1.94 db 0110: -2.38 db 0111: -2.85 db 1000: -3.35 db 1001: -3.88 db 1010: -4.44 db 1011: -5.04 db 1100: -5.68 db 1101: -6.38 db 1110: -7.13 db 1111: -7.96 db Reset to 1000

PCIe-to-PCI Reversible Bridge Page 94 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 13:12 Transmitter Termination Control RW 00: 52 ohms 01: 57 ohms 10: 43 ohms 11: 46 ohms Reset to 00 15:14 Receiver Termination Control RW 00: 52 ohms 01: 57 ohms 10: 43 ohms 11: 46 ohms Reset to 00

7.5.42 MEMORY ADDRESS FORWARDING CONTROL REGISTER – OFFSET 68h

BIT FUNCTION TYPE DESCRIPTION 19:16 Lookup Table Page Size RW If bit [20] of Offset 68h is low, then 0000: Disable Upstream Memory 2 Base Address Register 0001: 256 bytes 0010: 512 bytes 0011: 1K bytes 0100: 2K bytes 0101: 4K bytes 0110: 8K bytes 0111: 16K bytes 1000: 32K bytes 1001: 64K bytes 1010: 128K bytes 1011: 256K bytes 1100: 512K bytes 1101: 1M bytes 1110: 2M bytes 1111: 4M bytes If bit [20] of Offset 68h is high, then 0000: Disable Upstream Memory 2 Base Address Register 0001: 8M bytes 0010: 16M bytes 0011: 32M bytes 01XX: Disable Upstream Memory 2 Base Address Register 1XXX: Disable Upstream Memory 2 Base Address Register Reset to 0h

20 Lookup Table Page Size

RW 0: Normal Lookup Table Page Size 1: Coarse Lookup Table Page Size Reset to 0

21 Upstream 64-bit Address

RW 0: Any 64-bit address transactions on secondary interface falling outside of Downstream Memory 3 address range are forwarded upstream 1: Enable 64-bit address transaction forwarding upstream based on Upstream Memory 3 address range without address translation Reset to 0 29:22 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 95 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.43 UPSTREAM MEMORY WRITE FRAGMENT CONTROL REGISTER – OFFSET 68h

BIT FUNCTION TYPE DESCRIPTION 31:30 Memory Write Fragment Control RW Upstream Memory Write Fragment Control 00: Fragment at 32-byte boundary 01: Fragment at 64-byte boundary 1x: Fragement at 128-byte boundary Reset to 10h

7.5.44 SUBSYSTEM VENDOR ID REGISTER – OFFSET 6Ch

BIT FUNCTION TYPE DESCRIPTION 15:0 Subsystem Vendor ID RO Subsystem vendor ID iden tifies the particular add-in card or subsystem. Reset to 00h

7.5.45 SUBSYSTEM ID REGISTER – OFFSET 6Ch

BIT FUNCTION TYPE DESCRIPTION 31:16 Subsystem ID RO Subsystem ID identifies the particular add-in card or subsystem. Reset to 00h

7.5.46 EEPROM AUTOLOAD CONTROL/STATUS REGISTER – OFFSET 70h

BIT FUNCTION TYPE DESCRIPTION RW This bit will be reset to 0 afte r the EEPROM operation is finished. 0: EEPROM AUTOLOAD disabled 0 -> 1: Starts the EEPROM Read or Write cycle Reset to 0 RW 0: Read 1: Write Reset to 0 1: EEPROM acknowledge is not received during EEPROM cycle Reset to 0 RO 0: EEPROM autoload is not successfully completed 1: EEPROM autoload is successfully completed Reset to 0 5:4 EEPROM Clock Frequency Control RW Where PCLK is 125MHz 00: PCLK / 4096 01: PCLK / 2048 10: PCLK / 1024 11: PCLK / 128 Reset to 00 1: Disable EEPROM autoload Reset to 0

PCIe-to-PCI Reversible Bridge Page 96 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION RW 0: Normal speed of EEPROM autoload 1: Increase EEPROM autoload by 32x Reset to 0 1: EEPROM autoload is on going Reset to 0 15:9 EEPROM Word Address RW EEPROM word address for EEPROM cycle Reset to 0000000 31:16 EEPROM Data RW EEPROM data to be written into the EEPROM Reset to 0000h

7.5.47 RESERVED REGISTER – OFFSET 74h

7.5.48 BRIDGE CONTROL AND ST ATUS REGISTER – OFFSET 78h

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RO Reset to 00

2 SERR_L Forward Enable RW/RO 0: Disable the forwarding of SERR_L to ERR_FATAL and

ERR_NONFATAL 1: Enable the forwarding of SERR_L to ERR_FATAL and ERR_NONFATAL Reset to 0 (FORWARD BRIDGE) RO bit for REVERSE BRIDGE

3 Secondary Interface Reset RW 0: Do not force th e assertion of RESET_L on secondary PCI/PCI-X bus in

forward bridge mode, or do not generate a hot reset on the PCI Express link in reverse bridge mode 1: Force the assertion of RESET_L on secondary PCI/PCI-X bus in forward bridge mode, or generate a hot reset on the PCI Express link in reverse bridge mode Reset to 0 5:4 VGA Enable RW 00: VGA memory and I/O tr ansactions on the primary and secondary interfaces are ignored, unless decoded by other mechanism 01: VGA memory and I/O transactions on the primary interface are forwarded to secondary interface without address translation, but VGA transactions on secondary interface are ignored 10: VGA memory and I/O transactions on the secondary interface are forwarded to primary interface without address translation, but VGA transactions on primary interface are ignored Reset to 00

6 VGA 16-bit Decode RW 0: Execute 10- bit address decodes on VGA I/O accesses

1: Execute 16-bit address decode on VGA I/O accesses Reset to 0

7 Master Abort Mode RW 0: Do not report mast er aborts (return FFFFFFFFh on reads and discards

data on write) 1: Report master abort by signaling target abort if possible or by the assertion of SERR_L (if enabled). Reset to 0

8 Primary Master Timeout RW 0: Primar y discard timer counts 215 PCI clock cycles

1: Primary discard timer counts 210 PCI clock cycles FORWARD BRIDGE – Bit is RO and ignored by PI7C9X110 Reset to 0

PCIe-to-PCI Reversible Bridge Page 97 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

9 Secondary Master Timeout RW 0: Seconda ry discard timer counts 215 PCI clock cycles

1: Secondary discard timer counts 210 PCI clock cycles REVERSE BRIDGE – Bit is RO and ignored by PI7C9X110 Reset to 0

10 Master Timeout Status RWC Bit is set when the discard timer expires and a delayed completion is

discarded at the PCI interface for the forward or reverse bridge Reset to 0

11 Discard Timer SERR_L

RW Bit is set to enable to gene rate ERR_NONFATAL or ERR_FATAL for forward bridge, or assert SERR_L for reverse bridge as a result of the expiration of the discard timer. It has no meaning if PI7C9X110 is in PCI-X mode. Reset to 0

7.5.49 GPIO DATA AND CONTROL REGISTER – OFFSET 78h

BIT FUNCTION TYPE DESCRIPTION 15:12 GPIO Output Write-1-to- Clear RW Reset to 0h 19:16 GPIO Output Write-1-to-Set RW Reset to 0h 23:20 GPIO Output Enable Write- 1-to-Clear RW Reset to 0h 27:24 GPIO Output Enable Write- 1-to-Set RW Reset to 0h 31:28 GPIO Input Data Register RO Reset to 0h

7.5.50 SECONDARY INTERRUPT LINE REGISTER – OFFSET 7Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Secondary Interrupt Line RW These bits apply to forward bridge only. For initialization code to program to tell which input of the interrupt controller the bridge’s INTA_L in connected to. Reset to 00000000

7.5.51 SECONDARY INTERRUPT PIN REGISTER – OFFSET 7Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Secondary Interrupt Pin RO These bits apply to forward bridge only. 00000001: Designates interrupt pin INTA_L is used Reset to 00h when reverse mode or 01h when forward mode.

7.5.52 SECONDARY MINIMUM GRANT REGISTER – OFFSET 7Ch

BIT FUNCTION TYPE DESCRIPTION 23:16 Secondary Minimum Grant RO This re gister is valid only in forward bridge mode. It specifies how long of a burst period that PI7C9X110 needs on the secondary bus in the units of ¼ microseconds. Reset to 0

PCIe-to-PCI Reversible Bridge Page 98 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.53 SECONDARY MAXIMUM LATENCY TIMER REGISTER – OFFSET 7Ch

BIT FUNCTION TYPE DESCRIPTION 31:24 Secondary Maximum Latency Timer RO This register is valid only in forward bridge mode. It specifies how often that PI7C9X110 needs to gain access to the primary bus in units of ¼ microseconds. Reset to 0

7.5.54 PCI-X CAPABILITY ID REGISTER – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 7:0 PCI-X Capability ID RO PCI-X Capability ID Reset to 07h

7.5.55 NEXT CAPABILITY POINTER REGISTER – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Capability Pointer RO Point to power management Reset to 90h

7.5.56 PCI-X SECONDARY STATUS REGISTER – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 16 64-bit Device on Secondary Bus Interface RO 64-bit not supported Reset to 0 17 133MHz Capable RO When this bit is 1, PI7C9X110 is 133MHz capable on its secondary bus interface Reset to 1 in forward bridge mode or 0 in reverse bridge mode This bit is a read-only and set to 0 in reverse bridge mode or is read-write in forward bridge mode When this is set to 1, a split completion has been discarded by PI7C9X110 at secondary bus because the requester did not accept the split completion transaction Reset to 0 RWC This bit is set to 0 in forward bridge mode or is read-write in reverse bridge mode When this is set to 1, an unexpected split completion has been received with the requester ID equaled to the secondary bus number, device number, and function number at the PI7X9X110 secondary bus interface Reset to 0 PI7C9X110 with either a retry or disconnect at the next ADB due to the buffer full condition Reset to 0 21 Split Request Delayed RWC When this bit is set to 1, a split request is delayed because PI7C9X110 is not able to forward the split request transaction to its secondary bus due to insufficient room within the limit specified in the split transaction commitment limit field of the downstream split transaction control register Reset to 0

PCIe-to-PCI Reversible Bridge Page 99 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 24:22 Secondary Clock Fre quency RO These bits are only meaningful in forward bridge mode. In reverse bridge mode, all three bits are set to zero. 000: Conventional PCI mode (minimum clock period not applicable) 001: 66MHz (minimum clock period is 15ns) 010: 100 to 133MHz (minimum clock period is 7.5ns) 011: Reserved 1xx: Reserved Reset to 000 31:25 Reserved RO 0000000

7.5.57 PCI-X BRIDGE STATUS REGISTER – OFFSET 84h

BIT FUNCTION TYPE DESCRIPTION 2:0 Function Number RO Function number (AD [10: 8] of a type 0 configuration transaction) Reset to 000 7:3 Device Number RO Device number (AD [15:11] of a type 0 configuration transaction) is assigned to the PI7C9X110 by the connection of system hardware. Each time the PI7C9X110 is addressed by a configuration write transaction, the bridge updates this register with the contents of AD [15:11] of the address phase of the configuration transaction, regardless of which register in the PI7C9X110 is addressed by the transaction. The PI7C9X110 is addressed by a configuration write transaction if all of the following are true:

• The transaction uses a configuration write command
• IDSEL is asserted during the address phase
• AD [1:0] are 00 (type o configuration transaction)
• AD [10:8] of the configuration address contain the appropriate function number Reset to 11111 15:8 Bus Number RO Additional address from wh ich the contents of the primary bus number register on type 1 configuration space header is read. The PI7C9X110 uses the bus number, device number, and function number fields to create a completer ID when responding with a split completion to a read of an internal PI7C9X110 register. These fields are also used for cases when one interface is in conventional PCI mode and the other is in PCI-X mode. Reset to 11111111 16 64-bit Device on Primary Bus Interface RO 64-bit not supported Reset to 0 17 133MHz Capable RO When this bit is 1, PI7C9X110 is 133MHz capable on its primary bus interface Reset to 0 in forward bridge mode or 1 in reverse bridge mode

This bit is a read-only and set to 0 in reverse bridge mode or is read-write in forward bridge mode When this is set to 1, a split completion has been discarded by PI7C9X110 at primary bus because the requester did not accept the split completion transaction Reset to 0 RWC This bit is set to 0 in forward bridge mode or is read-write in reverse bridge mode When this is set to 1, an unexpected split completion has been received with the requester ID equaled to the primary bus number, device number, and function number at the PI7X9X110 primary bus interface Reset to 0

PCIe-to-PCI Reversible Bridge Page 100 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION PI7C9X110 with either a retry or disconnect at the next ADB due to the buffer full condition Reset to 0 21 Split Request Delayed RWC When this bit is set to 1, a split request is delayed because PI7C9X110 is not able to forward the split request transaction to its primary bus due to insufficient room within the limit specified in the split transaction commitment limit field of the downstream split transaction control register Reset to 0 31:22 Reserved RO 0000000000

7.5.58 UPSTREAM SPLIT TRANSACTION REGISTER – OFFSET 88h

BIT FUNCTION TYPE DESCRIPTION 15:0 Upstream Split Transaction Capability RO Upstream Split Transaction Capability sp ecifies the size of the buffer (in the unit of ADQs) to store split completions for memory read. It applies to the requesters on the secondary bus in addressing the completers on the primary bus. The 0010h value shows that the buffer has 16 ADQs or 2K bytes storage Reset to 0010h 31:16 Upstream Split Transaction Commitment Limit RW Upstream Split Transaction Commitment Limit indicates the cumulative sequence size of the commitment limit in units of ADQs. This field can be programmed to any value or equal to the content of the split capability field. For example, if the limit is set to FFFFh, PI7C9X110 is allowed to forward all split requests of any size regardless of the amount of buffer space available. The split transaction commitment limit is set to 0010h that is the same value as the split transaction capability. Reset to 0010h

7.5.59 DOWNSTREAM SPLIT TRANSACTION REGISTER – OFFSET 8Ch

BIT FUNCTION TYPE DESCRIPTION 15:0 Downstream Split Transaction Capability RO Downstream Split Transaction Capability specifies the size of the buffer (in the unit of ADQs) to store split completions for memory read. It applies to the requesters on the primary bus in addressing the completers on the secondary bus. The 0010h value shows that the buffer has 16 ADQs or 2K bytes storage Reset to 0010h 31:16 Downstream Split Transaction Commitment Limit RW Downstream Split Transaction Comm itment Limit indicates the cumulative sequence size of the commitment limit in units of ADQs. This field can be programmed to any value or equal to the content of the split capability field. For example, if the limit is set to FFFFh, PI7C9X110 is allowed to forward all split requests of any size regardless of the amount of buffer space available. The split transaction commitment limit is set to 0010h that is the same value as the split transaction capability. Reset to 0010h

7.5.60 POWER MANAGEMENT ID REGISTER – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 7:0 Power Management ID RO Po wer Management ID Register Reset to 01h

PCIe-to-PCI Reversible Bridge Page 101 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.61 NEXT CAPABILITY POINTER REGISTER – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer (point to Subsystem ID and Subsystem Vendor ID) Reset to A8h

7.5.62 POWER MANAGEMENT CAPABILITY REGISTER – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 18:16 Version Number RO Version number that complies with revision 2.0 of the PCI Power Management Interface specification. Reset to 010 (DSI) RO DSI – no special initialization of th is function beyond the standard PCI configuration header is required following transition to the D0 un-initialized state Reset to 0 24:22 AUX Current RO 000: 0mA 001: 55mA 010: 100mA 011: 160mA 100: 220mA 101: 270mA 110: 320mA 111: 375mA Reset to 001 31:27 PME_L Support RO PME_L is supported in D3 cold, D3 hot, and D0 states. Reset to 11001

7.5.63 POWER MANAGEMENT CONTROL AND STATUS REGISTER – OFFSET 94h

BIT FUNCTION TYPE DESCRIPTION 1:0 Power State RW Power State is used to determ ine the current power state of PI7C9X110. If a non-implemented state is written to this register, PI7C9X110 will ignore the write data. When present state is D3 and changing to D0 state by programming this register, the power state change causes a device reset without activating the RESET_L of PCI/PCI-X bus interface 00: D0 state 01: D1 state not implemented 10: D2 state not implemented 11: D3 state Reset to 00 7:2 Reserved RO Reset to 000000

PCIe-to-PCI Reversible Bridge Page 102 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 1: PME_L assertion is enabled Reset to 0 12:9 Data Select RO Data re gister is not implemented Reset to 0000 14:13 Data Scale RO Data re gister is not implemented Reset to 00

7.5.64 PCI-TO-PCI SUPPORT EXTEN SION REGISTER – OFFSET 94h

BIT FUNCTION TYPE DESCRIPTION 21:16 Reserved RO Reset to 000000 RO 0: PCI Bus Power/Clock Disabled Reset to 0 31:24 Data Register RO Data register is not implemented Reset to 00h

7.5.65 DOWNSTREAM MEMORY 0 TRANSLATED BASE REGISTER – OFFSET 98h

BIT FUNCTION TYPE DESCRIPTION 11:0 Reserved RO Reset to 000h 31:12 Downstream Memory 0 Translated Base RW Define the translated base addre ss for downstream memory transactions whose initiator addresses fall into Downstream Memory 0 (above lower 4K boundary) address range. The number of bits that are used for translated base is determined by its setup register (offset 9Ch) Reset to 00000h

7.5.66 DOWNSTREAM MEMORY 0 SETUP REGISTER – OFFSET 9Ch

BIT FUNCTION TYPE DESCRIPTION

0 Type Selector RO 0: Memory space is requested

2:1 Address Type RO (WS) 00: 32-bit address space 01: 64-bit address space Reset to 00

3 Prefetchable Control RO

(WS) 0: Non-prefetchable 1: Prefetchable Reset to 0 11:4 Reserved RO Reset to 00h 30:12 Base Address Register Size RO (WS) 0: Set the corresponding bit in the Base Address Register to read only. 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range. Reset to 7FFFFh

PCIe-to-PCI Reversible Bridge Page 103 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

31 Base Address Register

(WS) Always set to 1 when a bus master attempts to write a zero to this bit. PI7C9X110 returns bit [31:12] as FFFFFh (for 4KB size). Reset to 1

7.5.67 CAPABILITY ID REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID RO Capability ID fo r Slot Identification. SI is off by default but can be turned on through EEPROM interface Reset to 04h

PCIe-to-PCI Reversible Bridge Page 104 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.68 NEXT POINTER REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer – poi nts to PCI Express capabilities register Reset to B0h

7.5.69 SLOT NUMBER REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 20:16 Expansion Slot Number RW Expansion slot number Reset to 00000 23:22 Reserved RO Reset to 00

7.5.70 CHASSIS NUMBER REGISTER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 31:24 Chassis Number RW Chassis number Reset to 00h

7.5.71 SECONDARY CLOCK AND CLKRUN CONTROL REGISTER – OFFSET A4h

BIT FUNCTION TYPE DESCRIPTION 1:0 S_CLKOUT0 Enable RW S_CLKOUT (Slot 0) Enable for forward bridge mode only 00: enable S_CLKOUT0 01: enable S_CLKOUT0 10: enable S_CLKOUT0 11: disable S_CLKOUT0 and driven LOW Reset to 00 3:2 S_CLKOUT1 Enable RW S_CLKOUT (Slot 1) Enable for forward bridge mode only 00: enable S_CLKOUT1 01: enable S_CLKOUT1 10: enable S_CLKOUT1 11: disable S_CLKOUT1 and driven LOW Reset to 00 5:4 S_CLKOUT2 Enable RW S_CLKOUT (Slot 2) Enable for forward bridge mode only 00: enable S_CLKOUT2 01: enable S_CLKOUT2 10: enable S_CLKOUT2 11: disable S_CLKOUT2 and driven LOW Reset to 00 7:6 S_CLKOUT3 Enable RW S_CLKOUT (Slot 3) Enable for forward bridge mode only 00: enable S_CLKOUT3 01: enable S_CLKOUT3 10: enable S_CLKOUT3 11: disable S_CLKOUT3 and driven LOW Reset to 00

PCIe-to-PCI Reversible Bridge Page 105 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 0: enable S_CLKOUT4 1: disable S_CLKOUT4 and driven LOW Reset to 0 0: enable S_CLKOUT5 1: disable S_CLKOUT5 and driven LOW Reset to 0 0: enable S_CLKOUT6 1: disable S_CLKOUT6 and driven LOW Reset to 0 0: enable S_CLKOUT7 1: disable S_CLKOUT7 and driven LOW Reset to 0 0: enable S_CLKOUT8 1: disable S_CLKOUT8 and driven LOW Reset to 0 0: secondary clock not stopped 1: secondary clock stopped Reset to 0 RW 0: disable protocol 1: enable protocol Reset to 0 1: Stop the secondary clock whenever the secondary bus is idle and there are no requests from the primary bus Reset to 0 31:16 Reserved RO Reset to 0000h

7.5.72 DONWSTREAM I/O OR MEMORY 1 TRANSLATED BASE REGISTER – OFFSET A8h

BIT FUNCTION TYPE DESCRIPTION 5:0 Reserved RO Reset to 000000 31:6 Downstream I/O or Memory

1 Translated Base

RW Define the translated base address for downstream I/O or memory transactions whose initiator addresses fall into Downstream I/O or Memory 1 address range. The number of bits that are used for translated base is determined by its setup register (offset ACh) Reset to 00000h

PCIe-to-PCI Reversible Bridge Page 106 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.73 DOWSTREAM I/O OR MEMORY 1 SETUP REGISTER – OFFSET ACh

BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO (WS) 00: 32-bit address space 01: 64-bit address space Reset to 00 (WS) 0: Non-prefetchable 1: Prefetchable Reset to 0 5:4 Reserved RO Reset to 00 30:6 Base Address Register Size RO (WS) 0: Set the corresponding bit in the Base Address Register to read only. 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range. If memory space is selected, bit [11:6] should be set to zeros. Reset to 00000000h (WS) 0: Disable this Base Address Register 1: Enable this Base Address Register Reset to 0

7.5.74 PCI EXPRESS CAPABILITY ID REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 7:0 PCI Express Capability ID RO PCI Express capability ID Reset to 10h

7.5.75 NEXT CAPABILITY POINTER REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Item Pointer RO Next ite m pointer (points to VPD register) Reset to D8h

7.5.76 PCI EXPRESS CAPABILIT Y REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 19:16 Capability Version RO Reset to 1h 23:20 Device / Port Type RO 0000: PCI Express endpoint device 0001: Legacy PCI Express endpoint device 0100: Root port of PCI Express root complex 0101: Upstream port of PCI Express switch 0110: Downstream port of PCI Express switch 0111: PCI Express to PCI bridge 1000: PCI to PCI Express bridge Others: Reserved Reset to 7h for Forward Bridge or 8h for Reverse Bridge 29:25 Interrupt Message Nu mber RO Reset to 0h 31:30 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 107 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.77 DEVICE CAPABILITY REGISTER – OFFSET B4h

BIT FUNCTION TYPE DESCRIPTION 2:0 Maximum Payload Size RO 000: 128 bytes 001: 256 bytes 010: 512 bytes 011: 1024 bytes 100: 2048 bytes 101: 4096 bytes 110: reserved 111: reserved Reset to 001 4:3 Phantom Functions RO No phantom functions supported Reset to 00 5 8-bit Tag Field RO 8-bit tag field supported Reset to 1 8:6 Endpoint L0’s Latency RO Endpoint L0’s acceptable latency 000: less than 64 ns 001: 64 – 128 ns 010: 128 – 256 ns 011: 256 – 512 ns 100: 512 ns – 1 us 101: 1 – 2 us 110: 2 – 4 us 111: more than 4 us Reset to 000 11:9 Endpoint L1’s Latency RO Endpoint L1’s acceptable latency 000: less than 1 us 001: 1 – 2 us 010: 2 – 4 us 011: 4 – 8 us 100: 8 – 16 us 101: 16 – 32 us 110: 32 – 64 us 111: more than 64 us Reset to 000 1: If Hot Plug is enabled at Forward Bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 1: If Hot Plug is enable at Forward Bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 1: If Hot Plug is enable at Forward Bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 17:15 Reserved RO Reset to 000 25:18 Captured Slot Power Limit Value RO These bits are set by the Set_Slot_Power_Limit message Reset to 00h

PCIe-to-PCI Reversible Bridge Page 108 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 27:26 Captured Slot Power Limit Scale RO This value is set by the Set_Slot_Power_Limit message Reset to 00 31:28 Reserved RO Reset to 0h

7.5.78 DEVICE CONTROL REGISTER – OFFSET B8h

BIT FUNCTION TYPE DESCRIPTION 7:5 Max Payload Size RW This field sets the maximum TLP payload size for the PI7C9X110 000: 128 bytes 001: 256 bytes 010: 512 bytes 011:1024 bytes 100: 2048 bytes 101: 4096 bytes 110: reserved 111: reserved Reset to 000 14:12 Maximum Read Request Size RW This field sets the maximum Read Request Size for the device as a requester 000: 128 bytes 001: 256 bytes 010: 512 bytes 011: 1024 bytes 100: 2048 bytes 101: 4096 bytes 110: reserved 111: reserved Reset to 2h

7.5.79 DEVICE STATUS REGISTER – OFFSET B8h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 109 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 1: Transaction is pending on transaction layer interface Reset to 0 31:22 Reserved RO Reset to 0000000000

7.5.80 LINK CAPABILITY REGISTER – OFFSET BCh

BIT FUNCTION TYPE DESCRIPTION 3:0 Maximum Link Speed RO Indicates th e maximum speed of the Express link 0001: 2.5Gb/s link Reset to 1 9:4 Maximum Link Width RO Indicates the maximu m width of the Express link (x1 at reset) 000000: reserved 000001: x1 000010: x2 000100: x4 001000: x8 001100: x12 010000: x16 100000: x32 Reset to 000001 11:10 ASPM Support RO This field indicates the level of Active State Power Management Support 00: reserved 01: L0’s entry supported 10: reserved 11: L0’s and L1’s supported Reset to 11 14:12 L0’s Exit Latency RO Reset to 3h 17:15 L1’s Exit Latency RO Reset to 0h 23:18 Reserved RO Reset to 0h 31:24 Port Number RO Reset to 00h

7.5.81 LINK CONTROL REGISTER – OFFSET C0h

BIT FUNCTION TYPE DESCRIPTION 1:0 ASPM Control RW This field controls th e level of ASPM supported on the Express link 00: disabled 01: L0’s entry enabled 10: L1’s entry enabled 11: L0’s and L1’s entry enabled Reset to 00 (RCB) RO Read completion boundary not supported Reset to 0

PCIe-to-PCI Reversible Bridge Page 110 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 15:8 Reserved RO Reset to 00h

PCIe-to-PCI Reversible Bridge Page 111 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.82 LINK STATUS REGISTER – OFFSET C0h

BIT FUNCTION TYPE DESCRIPTION 19:16 Link Speed RO This field indicates the negotiated speed of the Express link 001: 2.5Gb/s link Reset to 1h 25:20 Negotiated Link Width RO 000000: reserved 000001: x1 000010: x2 000100: x4 001000: x8 001100: x12 010000: x16 100000: x32 Reset to 000001 31:29 Reserved RO Reset to 0

7.5.83 SLOT CAPABILITY REGISTER – OFFSET C4h

BIT FUNCTION TYPE DESCRIPTION 1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 1: If Hot Plug is enabled at reverse bridge Reset to 0 when hot-plug is disabled or 1 when hot-plug is enabled through strapping. 14:7 Slot Power Limit Value RO Reset to 00h 16:15 Slot Power Limit Scale RO Reset to 00 18:17 Reserved RO Reset to 00 31:19 Physical Slot Number RO Reset to 0

7.5.84 SLOT CONTROL REGISTER – OFFSET C8h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 112 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 7:6 Attention Indicator Control RW Reset to 0 9:8 Power Indicator Control RW Reset to 0 15:11 Reserved RO Reset to 0

7.5.85 SLOT STATUS REGISTER – OFFSET C8h

BIT FUNCTION TYPE DESCRIPTION 31:23 Reserved RO Reset to 0

7.5.86 XPIP CONFIGURATION REGISTER 0 – OFFSET CCh

BIT FUNCTION TYPE DESCRIPTION Configuration State when in LTSSM state RW Reset to 0 7:5 Negotiate Lane Number of Times RW Reset to 3h 12:8 TS1 Number Counter RW Reset to 10h 15:13 Reserved RO Reset to 0 31:16 LTSSM Enter L1 Timer Default Value RW Reset to 0400h

7.5.87 XPIP CONFIGURATION REGISTER 1 – OFFSET D0h

BIT FUNCTION TYPE DESCRIPTION 9:0 L0’s Lifetime Timer RW Reset to 0 15:10 Reserved RO Reset to 0 31:16 L1 Lifetime Timer RW Reset to 0

7.5.88 XPIP CONFIGURATION REGISTER 2 – OFFSET D4h

BIT FUNCTION TYPE DESCRIPTION 7:0 CDR Recovery Time (in the number of FTS order sets) RW Reset to 54h A Fast Training Sequence order set composes of one K28.5 (COM) Symbol and three K28.1 Symbols. 14:8 L0’s Exit to L0 Latency RW Reset to 2h

PCIe-to-PCI Reversible Bridge Page 113 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 22:16 L1 Exit to L0 Latency RW Reset to 19h 31:23 Reserved RO Reset to 0

7.5.89 CAPABILITY ID REGISTER – OFFSET D8h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID for VPD Register RO Reset to 03h

7.5.90 NEXT POINTER REGISTER – OFFSET D8h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer (F0h, points to MSI capabilities) Reset to F0h

7.5.91 VPD REGISTER – OFFSET D8h

BIT FUNCTION TYPE DESCRIPTION 17:16 Reserved RO Reset to 0 23:18 VPD Address for Read/Write Cycle RW Reset to 0 30:24 Reserved RO Reset to 0 bits [7:2] of offset D8h. This bit remains at ‘0’ until EEPROM cycle is finished, after which the bit is then set to ‘1’. Data for reads is available at register ECh. 1: Generate a write cycle to the EEPROM at the VPD address specified in bits [7:2] of offset D8h. This bit remains at ‘1’ until EEPROM cycle is finished, after which it is then cleared to ‘0’. Reset to 0

7.5.92 VPD DATA REGISTER – OFFSET DCh

BIT FUNCTION TYPE DESCRIPTION 31:0 VPD Data RW VPD Data (EEPROM data [address + 0x40]) The least significant byte of this register corresponds to the byte of VPD at the address specified by the VPD address register. The data read form or written to this register uses the normal PCI byte transfer capabilities. Reset to 0

7.5.93 UPSTREAM MEMORY 0 TRANSLATED BASE REGISTER – OFFSET E0h

BIT FUNCTION TYPE DESCRIPTION 11:0 Reserved RO Reset to 000h 31:12 Downstream Memory 0 Translated Base RW Define the translated base address for upstream memory transactions whose initiator addresses fall into Upstream Memory 0 (above lower 4K boundary) address range. The number of bits that are used for translated base is determined by its setup register (offset E4h) Reset to 00000h

PCIe-to-PCI Reversible Bridge Page 114 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.94 UPSTREAM MEMORY 0 S ETUP REGISTER – OFFSET E4h

BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO (WS) 00: 32-bit address space 01: 64-bit address space Reset to 00 (WS) 0: Non-prefetchable 1: Prefetchable Reset to 0 11:4 Reserved RO Reset to 00h 30:12 Base Address Register Size RO (WS) 0: Set the corresponding bit in the Base Address Register to read only. 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range. Reset to 00000h (WS) Always set to 1 when a bus master attempts to write a zero to this bit. PI7C9X110 returns bit [31:12] as FFFFFh (for 4KB size). Reset to 1

7.5.95 UPSTREAM I/O OR MEMORY 1 T RANSLATED BASE REGISTER – OFFSET E8h

BIT FUNCTION TYPE DESCRIPTION 5:0 Reserved RO Reset to 000000 31:6 Upstream I/O or Memory 1 Translated Base RW Define the translated base address for upstream I/O or memory transactions whose initiator addresses fall into Upstream I/O or Memory 1 address range. The number of bits that are used for translated base is determined by its setup register (offset ECh) Reset to 00000h

7.5.96 UPSTREAM I/O OR MEMORY 1 SETUP REGISTER – OFFSET ECh

BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO (WS) 00: 32-bit address space 01: 64-bit address space Reset to 00 (WS) 0: Non-prefetchable 1: Prefetchable Reset to 0 5:4 Reserved RO Reset to 00 30:6 Base Address Register Size RO (WS) 0: Set the corresponding bit in the Base Address Register to read only. 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range. If memory space is selected, bit [11:6] should be set to zeros. Reset to 00000000h

PCIe-to-PCI Reversible Bridge Page 115 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION (WS) 0: Disable this Base Address Register 1: Enable this Base Address Register Reset to 0

PCIe-to-PCI Reversible Bridge Page 116 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.97 MESSAGE SIGNALED INTERRUPTS ID REGISTER – F0h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability ID for MSI Registers RO Reset to 05h

7.5.98 NEXT CAPABILITIES POINTER REGISTER – F0h

BIT FUNCTION TYPE DESCRIPTION 15:8 Next Pointer RO Next pointer (00h indicates the end of capabilities) Reset to 00h

7.5.99 MESSAGE CONTROL REGISTER – OFFSET F0h

BIT FUNCTION TYPE DESCRIPTION 1: Enable MSI for interrupt service and ignore INTx interrupt pins 19:17 Multiple Message Capable RO 000: 1 message requested 001: 2 messages requested 010: 4 messages requested 011: 8 messages requested 100: 16 messages requested 101: 32 messages requested 110: reserved 111: reserved Reset to 000 22:20 Multiple Message Enable RW 000: 1 message requested 001: 2 messages requested 010: 4 messages requested 011: 8 messages requested 100: 16 messages requested 101: 32 messages requested 110: reserved 111: reserved Reset to 000 23 64-bit Address Capable RW Reset to 1 31:24 Reserved RO Reset to 00h

7.5.100 MESSAGE ADDRESS REGISTER – OFFSET F4h

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RO Reset to 00 31:2 System Specified Message Address RW Reset to 0

7.5.101 MESSAGE UPPER ADDRESS REGISTER – OFFSET F8h

BIT FUNCTION TYPE DESCRIPTION 31:0 System Specified Message Upper Address RW Reset to 0

7.5.102 MESSAGE DATA REGISTER – OFFSET FCh

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 117 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 15:0 System Specified Message Data RW Reset to 0 31:16 Reserved RO Reset to 0

7.5.103 ADVANCE ERROR REPORTING CAPABILITY ID REGISTER – OFFSET 100h

BIT FUNCTION TYPE DESCRIPTION 15:0 Advance Error Reporting Capability ID RO Reset to 0001h

7.5.104 ADVANCE ERROR REPORTING CAPABILITY VERSION REGISTER – OFFSET 100h

BIT FUNCTION TYPE DESCRIPTION 19:16 Advance Error Reporting Capability Version RO Reset to 1h

7.5.105 NEXT CAPABILITY OFFSET REGISTER – OFFSET 100h

BIT FUNCTION TYPE DESCRIPTION 31:20 Next Capability Offset RO Next cap ability offset (150h points to VC capability) Reset to 150h

7.5.106 UNCORRECTABLE ERROR STATUS REGISTER – OFFSET 104h

BIT FUNCTION TYPE DESCRIPTION 3:1 Reserved RO Reset to 0 11:5 Reserved RO Reset to 0 31:21 Reserved RO Reset to 0

7.5.107 UNCORRECTABLE ERROR MASK REGISTER – OFFSET 108h

BIT FUNCTION TYPE DESCRIPTION 3:1 Reserved RO Reset to 0 11:5 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 118 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:21 Reserved RO Reset to 0

7.5.108 UNCORRECTABLE ERROR SEVERITY REGISTER – OFFSET 10Ch

BIT FUNCTION TYPE DESCRIPTION 3:1 Reserved RO Reset to 0 11:5 Reserved RO Reset to 0 31:21 Reserved RO Reset to 0

7.5.109 CORRECTABLE ERROR STATUS REGISTER – OFFSET 110h

BIT FUNCTION TYPE DESCRIPTION 5:1 Reserved RO Reset to 0 11:9 Reserved RO Reset to 0 31:13 Reserved RO Reset to 0

7.5.110 CORRECTABLE ERROR MASK REGISTER – OFFSET 114h

BIT FUNCTION TYPE DESCRIPTION 5:1 Reserved RO Reset to 0 11:9 Reserved RO Reset to 0 31:13 Reserved RO Reset to 0

PCIe-to-PCI Reversible Bridge Page 119 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.5.111 ADVANCED ERROR CAPABILITIES AND CONTROL REGISTER – OFFSET 118h

BIT FUNCTION TYPE DESCRIPTION 4:0 First Error Pointer ROS Reset to 0h 31:9 Reserved RO Reset to 0

7.5.112 HEADER LOG REGISTER 1 – OFFSET 11Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 3 ROS Reset to 0 15:8 Header Byte 2 ROS Reset to 0 23:16 Header Byte 1 ROS Reset to 0 31:24 Header Byte 0 ROS Reset to 0

7.5.113 HEADER LOG REGISTER 2 – OFFSET 120h

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 7 ROS Reset to 0 15:8 Header Byte 6 ROS Reset to 0 23:16 Header Byte 5 ROS Reset to 0 31:24 Header Byte 4 ROS Reset to 0

7.5.114 HEADER LOG REGISTER 3 – OFFSET 124h

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 11 ROS Reset to 0 15:8 Header Byte 10 ROS Reset to 0 23:16 Header Byte 9 ROS Reset to 0 31:24 Header Byte 8 ROS Reset to 0

7.5.115 HEADER LOG REGISTER 4 – OFFSET 128h

BIT FUNCTION TYPE DESCRIPTION 7:0 Header Byte 15 ROS Reset to 0 15:8 Header Byte 14 ROS Reset to 0 23:16 Header Byte 13 ROS Reset to 0 31:24 Header Byte 12 ROS Reset to 0

7.5.116 SECONDARY UNCORRECTABLE ERROR STATUS REGISTER – OFFSET 12Ch

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 120 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:14 Reserved RO Reset to 0

7.5.117 SECONDARY UNCORRECTABLE ERROR MASK REGISTER – OFFSET 130h

BIT FUNCTION TYPE DESCRIPTION 31:14 Reserved RO Reset to 0

7.5.118 SECONDARY UNCORRECTABLE ERROR SEVERITY REGISTER – OFFSET 134h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 121 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:14 Reserved RO Reset to 0

7.5.119 SECONDARY ERROR CAPABILITY AND CONTROL REGISTER – OFFSET 138h

BIT FUNCTION TYPE DESCRIPTION 4:0 Secondary First Error Pointer ROW Reset to 0 31:5 Reserved RO Reset to 0

7.5.120 SECONDARY HEADER LOG REGISTER – OFFSET 13Ch – 148h

BIT FUNCTION TYPE DESCRIPTION 35:0 Transaction Attribute ROS Tran saction attribute, CBE [3:0] and AD [31:0] during attribute phase Reset to 0 39:36 Transaction Command Lower ROS Transaction command lower, CBE [3:0] during first address phase Reset to 0 43:40 Transaction Command Upper ROS Transaction command upper, CBE [3 :0] during second address phase of DAC transaction Reset to 0 63:44 Reserved ROS Reset to 0 95:64 Transaction Address ROS Transaction addr ess, AD [31:0] during first address phase Reset to 0 127:96 Transaction Address ROS Transaction addres s, AD [31:0] during second address phase of DAC transaction Reset to 0

7.5.121 RESERVED REGISTER – OFFSET 14Ch

7.5.122 VC CAPABILITY ID REGISTER – OFFSET 150h

BIT FUNCTION TYPE DESCRIPTION 15:0 VC Capability ID RO Reset to 0002h

7.5.123 VC CAPABILITY VERSION REGISTER – OFFSET 150h

PCIe-to-PCI Reversible Bridge Page 122 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 19:16 VC Capability Version RO Reset to 1h

7.5.124 NEXT CAPABILITY OFFSET REGISTER – OFFSET 150h

BIT FUNCTION TYPE DESCRIPTION 31:20 Next Capability Offset RO Next capability offset – the end of capabilities Reset to 0

7.5.125 PORT VC CAPABILITY REGISTER 1 – OFFSET 154h

BIT FUNCTION TYPE DESCRIPTION 2:0 Extended VC Count RO Reset to 0 6:4 Low Priority Extended VC Count RO Reset to 0 9:8 Reference Clock RO Reset to 0 11:10 Port Arbitration Table Entry Size RO Reset to 0 31:12 Reserved RO Reset to 0

7.5.126 PORT VC CAPABILITY REGISTER 2 – OFFSET 158h

BIT FUNCTION TYPE DESCRIPTION 7:0 VC Arbitration Capability RO Reset to 0 23:8 Reserved RO Reset to 0 31:24 VC Arbitration Table Offset RO Reset to 0

7.5.127 PORT VC CONTROL REGISTER – OFFSET 15Ch

BIT FUNCTION TYPE DESCRIPTION 3:1 VC Arbitration Select RO Reset to 0 15:4 Reserved RO Reset to 0

7.5.128 PORT VC STATUS REGISTER – OFFSET 15Ch

BIT FUNCTION TYPE DESCRIPTION 31:17 Reserved RO Reset to 0

7.5.129 VC0 RESOURCE CAPABILITY REGISTER – OFFSET 160h

BIT FUNCTION TYPE DESCRIPTION 7:0 Port Arbitration Capability RO Reset to 0 13:8 Reserved RO Reset to 0 22:16 Maximum Time Slots RO Reset to 0 31:24 Port Arbitration Table Offset RO Reset to 0

7.5.130 VC0 RESOURCE CONTROL REGISTER – OFFSET 164h

BIT FUNCTION TYPE DESCRIPTION

PCIe-to-PCI Reversible Bridge Page 123 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 7:1 TC / VC Map RW For TC7 to TC1 Reset to 7Fh 15:8 Reserved RO Reset to 0 19:17 Port Arbitration Select RO Reset to 0 23:20 Reserved RO Reset to 0 26:24 VC ID RO Reset to 0 30:27 Reserved RO Reset to 0

7.5.131 VC0 RESOURCE STATUS REGISTER – OFFSET 168h

BIT FUNCTION TYPE DESCRIPTION 31:2 Reserved RO Reset to 0

7.5.132 RESERVED REGISTERS – OFFSET 16Ch – 300h

7.5.133 EXTRA GPI/GPO DATA AND CONTROL REGISTER – OFFSET 304h

BIT FUNCTION TYPE DESCRIPTION 3:0 Extra GPO RWC GPO [3:0], write 1 to clear Reset to 0 7:4 Extra GPO RWS GPO [3:0], write 1 to set Reset to 0 11:8 Extra GPO enable RWC GPO [3 :0] enable, write 1 to clear Reset to 0 15:12 Extra GPO enable RWS GPO [3:0] enable, write 1 to set Reset to 0 19:16 Extra GPI RO Extra GPI [3:0] Data Register Reset to 0 31:20 Reserved RO Reset to 0

7.5.134 RESERVED REGISTERS – OFFSET 308h – 30Ch

7.5.135 REPLAY AND ACKNOWLEDGE LATENCY TIMERS – OFFSET 310h

BIT FUNCTION TYPE DESCRIPTION 11:0 Replay Timer RW Replay Timer Reset to 0 15:13 Reserved RO Reset to 0 29:16 Acknowledge Latency Timer RW Acknowledge Latency Timer Reset to 0 RO Acknowledge Latency Timer Enable Reset to 0

7.5.136 RESERVED REGISTERS – OFFSET 314h – FFCh

PCIe-to-PCI Reversible Bridge Page 124 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.6 CONTROL AND STATUS REGISTER S FOR NON-TRANSPARENT BRIDGE

Control and Status Registers (CSR’s) can be accessed by Memory or I/O transactions from both primary and secondary ports. The CSR’s are defined and to be used along with configuration registers (see previous section 7.5 for details) for non-transparent bridge operations. Register Type Descriptions RO Read Only ROS Read Only and Sticky RW Read/Write RWC Read/Write “1” to clear RWS Read/Write and Sticky RWCS Read/Write “1” to clear and Sticky

7.6.1 RESERVED REGISTERS – OFFSET 000h TO 004h

7.6.2 DOWNSTREAM MEMORY 2 TRANSLAT ED BASE REGISTER – OFFSET 008h

BIT FUNCTION TYPE DESCRIPTION 11:0 Reserved RO Reset to 000h 31:12 Downstream Memory 2 Translated Base RW Define the translated base addre ss for downstream memory transactions whose initiator addresses fall into Downstream Memory 2 address range. The number of bits that are used for translated base is determined by its setup register (offset 00Ch) Reset to 00000h

7.6.3 DOWNSTREAM MEMORY 2 SETUP REGISTER – OFFSET 00Ch

BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO (WS) 00: 32-bit address space 01: 64-bit address space Reset to 00 (WS) 0: Non-prefetchable 1: Prefetchable Reset to 0 11:4 Reserved RO Reset to 00 30:12 Base Address Register Size RO (WS) 0: Set the corresponding bit in the Base Address Register to read only 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range Reset to 00000h (WS) 0: Disable this Base Address Register 1: Enable this Base Address Register Reset to 0

7.6.4 DOWNSTREAM MEMORY 3 TRANSLAT ED BASE REGISTER – OFFSET 010h

BIT FUNCTION TYPE DESCRIPTION 11:0 Reserved RO Reset to 000000

PCIe-to-PCI Reversible Bridge Page 125 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 31:12 Downstream Memory 3 Translated Base RW Define the translated base addre ss for downstream memory transactions whose initiator addresses fall into Downstream Memory 3 address range. The number of bits that are used for translated base is determined by its setup register (offset 014h) Reset to 00000h

7.6.5 DOWNSTREAM MEMORY 3 SE TUP REGISTER – OFFSET 014h

BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO (WS) 00: 32-bit address space 01: 64-bit address space Reset to 00 (WS) 0: Non-prefetchable 1: Prefetchable Reset to 0 11:4 Reserved RO Reset to 00 30:12 Base Address Register Size RO (WS) 0: Set the corresponding bit in the Base Address Register to read only 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range Reset to 00000h (WS) 0: Disable this Base Address Register 1: Enable this Base Address Register Reset to 0

7.6.6 DOWNSTREAM MEMORY 3 UPPER 32- BIT SETUP REGISTER – OFFSET 018h

BIT FUNCTION TYPE DESCRIPTION 30:0 Base Address Register Size RW 0: Set the correspondi ng bit in the Upper 32-bit Base Address Register to read only 1: Set the corresponding bit in the Upper 32-bit Base Address Register to read/write in order to control the size of the address range Reset to 00000000h RW) 0: Disable 64-bit Base Address Register 1: Enable 64-bit Base Address Register Reset to 0

7.6.7 RESERVED REGISTERS – OFFSET 01Ch TO 030h

7.6.8 UPSTREAM MEMORY 3 S ETUP REGISTER – OFFSET 34h

BIT FUNCTION TYPE DESCRIPTION 2:1 Address Type RO 00: 32-bit address space 01: 64-bit address space Reset to 01

PCIe-to-PCI Reversible Bridge Page 126 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION

3 Prefetchable Control RW

0: Non-prefetchable 1: Prefetchable Reset to 0 11:4 Reserved RO Reset to 00 31:12 Base Address Register Size RW 0: Set the corres ponding bit in the Base Address Register to read only 1: Set the corresponding bit in the Base Address Register to read/write in order to control the size of the address range Reset to 00000h

7.6.9 UPSTREAM MEMORY 3 UPPER 32- BIT SETUP REGISTER – OFFSET 038h

BIT FUNCTION TYPE DESCRIPTION 30:0 Base Address Register Size RW 0: Set the correspondi ng bit in the Upper 32-bit Base Address Register to read only 1: Set the corresponding bit in the Upper 32-bit Base Address Register to read/write in order to control the size of the address range Reset to 00000000h RW 0: Disable 64-bit Base Address Register 1: Enable 64-bit Base Address Register Reset to 0

7.6.10 RESERVED REGISTERS – OFFSET 03Ch TO 04Ch

7.6.11 LOOKUP TABLE OFFSET – OFFSET 050h

BIT FUNCTION TYPE DESCRIPTION 7:0 Lookup Table Offset RW This register contains the byte offset of the Lookup Table Entry to be accessed for upstream memory 2. The access is initiated when the lookup Table Data Register is accessed. This register should be written first before any Lookup Table Data access. Reset to 00h 31:8 Reserved RO Reset to 0

7.6.12 LOOKUP TABLE DATA – OFFSET 054h

BIT FUNCTION TYPE DESCRIPTION

0 Valid RW 0: Invalid lookup

1: Valid lookup Reset to 0 2:1 Reserved RO Reset to 00

3 Prefetchable RW 0: Memory address is non-prefetchable

1: Memory address is Reset to 0 7:4 Reserved RO Reset to 0h

PCIe-to-PCI Reversible Bridge Page 127 of 145 Pericom Semiconductor November 2007, Revision 2.4 BIT FUNCTION TYPE DESCRIPTION 24:8 Translated base or Reserved RW/RO Data written or re ad from the Lookup Table at the offset specified in the Lookup Table Offset Register. When writing to this register, the data value is written to the specified Lookup Table entry. When reading from this register, the data reflects the data value from the specified Lookup Table entry. The bit [24:8] is Translated Base Register bit when the lookup table size is set to 256B range. The bit [24:8] is reserved when the lookup table size is set to 32MB range (see PCI configuration offset 68h for non- transparent mode). Reset to 0 31:25 Translated Base RW Data written or read from the Lookup Table at the offset specified in the Lookup Table Offset Register. When writing to this register, the data value is written to a specific Lookup Table entry (CSR offset 100h – 1FFh). When reading from this register, the data reflects the data value from the specific Lookup Table entry. Reset to 0

7.6.13 UPSTREAM PAGE BOUNDARY IRQ 0 REQUEST REGISTER – OFFSET 058h

BIT FUNCTION TYPE DESCRIPTION 31:0 Upstream Page Boundary IRQ 0 RWC Each interrupt request bit is correspondent to a page entry in the lower half of the Upstream Memory 2 range. Bit [0] is for the first page, and bit [31] is for the 32nd page. PI7C9X110 sets the appropriate bit when it successfully transfers data to or from the imitator that addresses the last Double Word in a page. PI7C9X110 initiates an interrupt request on secondary interface when the interrupt request bit is set and the corresponding Upstream Page Boundary IRQ 0 Mask bit is reset. When forward bridge, PI7C9X110 asserts INTA_L or generates MSI on secondary bus (PCI interface). When reverse bridge, PI7C9X110 sends INTA_L assertion message or generates MSI on secondary interface (PCI Express). When writing a “1” to this register, it clears the corresponding interrupt request bit. Reset to 0

7.6.14 UPSTREAM PAGE BOUNDARY IRQ 1 REQUEST REGISTER – OFFSET 05Ch

BIT FUNCTION TYPE DESCRIPTION 31:0 Upstream Page Boundary IRQ 1 RWC Each interrupt request bit is correspondent to a page entry in the lower half of the Upstream Memory 2 range. Bit [0] is for the 33rd page, and bit [31] is for the 64th page. PI7C9X110 sets the appropriate bit when it successfully transfers data to or from the initiator that addresses the last Double Word in a page. PI7C9X110 initiates an interrupt request on secondary interface when the interrupt request bit is set and the corresponding Upstream Page Boundary IRQ 1 Mask bit is reset. When forward bridge, PI7C9X110 asserts INTA_L or generates MSI on secondary bus (PCI interface). When reverse bridge, PI7C9X110 sends INTA_L assertion message or generates MSI on secondary interface (PCI Express). When wrting a “1” to this register, it clears the corresponding interrupt request bit. Reset to 0

PCIe-to-PCI Reversible Bridge Page 128 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.6.15 UPSTREAM PAGE BOUNDARY IR Q 0 MASK REGISTER – OFFSET 060h

BIT FUNCTION TYPE DESCRIPTION 31:0 Upstream Page Boundary IRQ 0 Mask RWC 0: PI7C9X110 can initiate an inte rrupt request when the correspondent request bit is set 1: PI7C9X110 cannot initiate any interrupt request even though the correspondent request bit is set Reset to FFFFFFFFh

7.6.16 UPSTREAM PAGE BOUNDARY IR Q 1 MASK REGISTER – OFFSET 064h

BIT FUNCTION TYPE DESCRIPTION 31:0 Upstream Page Boundary IRQ 1 Mask RWC 0: PI7C9X110 can initiate an inte rrupt request when the correspondent request bit is set 1: PI7C9X110 cannot initiate any interrupt request even though the correspondent request bit is set Reset to FFFFFFFFh

7.6.17 RESERVED REGISTER – OFFSET 068C

7.6.18 PRIMARY CLEAR IRQ REGISTER – OFFSET 070h

BIT FUNCTION TYPE DESCRIPTION 15:0 Primary Clear IRQ RWC When writing “1” to this register bit, it clears the correspondent interrupt request bit. When reading this register, it returns the interrupt request bit status: 0: It is not the bit that causes the interrupt request on primary interface 1: It is the bit that causes the interrupt request on primary interface Reset to 0000h

7.6.19 SECONDARY CLEAR IRQ REGISTER – OFFSET 070h

BIT FUNCTION TYPE DESCRIPTION 31:16 Secondary Clear IRQ RWC When writing “1” to this register bit, it clears the correspondent interrupt request bit. When reading this register, it returns the interrupt request bit status: 0: It is not the bit that causes the interrupt request on secondary interface 1: It is the bit that causes the interrupt request on secondary interface Reset to 0000h

PCIe-to-PCI Reversible Bridge Page 129 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.6.20 PRIMARY SET IRQ REGISTER – OFFSET 074h

BIT FUNCTION TYPE DESCRIPTION 15:0 Primary Set IRQ RWS When writing “1” to this regi ster bit, it set the correspondent interrupt request bit. When reading this register, it returns the interrupt request bit status: 0: It is not the bit that causes the interrupt request on primary interface 1: It is the bit that causes the interrupt request on primary interface Reset to 0000h

7.6.21 SECONDARY SET IRQ REGISTER – OFFSET 074h

BIT FUNCTION TYPE DESCRIPTION 31:16 Secondary Set IRQ RWS When writing “1” to this re gister bit, it set the correspondent interrupt request bit. When reading this register, it returns the interrupt request bit status: 0: It is not the bit that causes the interrupt request on secondary interface 1: It is the bit that causes the interrupt request on secondary interface Reset to 0000h

7.6.22 PRIMARY CLEAR IRQ MASK REGISTER – OFFSET 078h

BIT FUNCTION TYPE DESCRIPTION 15:0 Primary Clear IRQ Mask RWS When writing “1” to th is register bit, it clears the correspondent interrupt request mask bit. When reading this register, it returns the primary Clear IRQ Mask bit status: 0: It allows to clear an interrupt request on primary interface 1: It does not allow to clear any interrupt request on primary interface Reset to FFFFh

7.6.23 SECONDARY CLEAR IRQ MASK REGISTER – OFFSET 078h

BIT FUNCTION TYPE DESCRIPTION 31:16 Secondary Clear IRQ Mask RWS When writing “1” to th is register bit, it clears the correspondent interrupt request mask bit. When reading this register, it returns the Secondary Clear IRQ Mask bit status: 0: It allows to clear an interrupt request on secondary interface 1: It does not allow to clear any interrupt request on secondary interface Reset to FFFFh

PCIe-to-PCI Reversible Bridge Page 130 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.6.24 PRIMARY SET IRQ MASK REGISTER – OFFSET 07Ch

BIT FUNCTION TYPE DESCRIPTION 15:0 Primary Set IRQ Mask RWS When writing “1” to this register bit, it set the correspondent interrupt request mask bit. When reading this register, it returns the Primary Set IRQ Mask bit status: 0: It allows to set an interrupt request on primary interface 1: It does not allow to set any interrupt request on primary interface Reset to FFFFh

7.6.25 SECONDARY SET IRQ MASK REGISTER – OFFSET 07Ch

BIT FUNCTION TYPE DESCRIPTION 31:16 Secondary Set IRQ Mask RWC When writing “1” to this register bit, it set the correspondent interrupt request mask bit. When reading this register, it returns the Secondary Set IRQ Mask bit status: 0: It allows to set an interrupt request on secondary interface 1: It does not allow to set any interrupt request on secondary interface Reset to FFFFh

7.6.26 RESERVED REGISTERS – OFFSET 080h TO 09Ch

7.6.27 SCRATCHPAD 0 REGISTER – OFFSET 0A0h

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 0 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

7.6.28 SCRATCHPAD 1 REGISTER – OFFSET 0A4h

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 1 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

PCIe-to-PCI Reversible Bridge Page 131 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.6.29 SCRATCHPAD 2 REGISTER – OFFSET 0A8h

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 2 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

7.6.30 SCRATCHPAD 3 REGISTER – OFFSET 0ACh

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 3 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

7.6.31 SCRATCHPAD 4 REGISTER – OFFSET 0B0h

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 4 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

7.6.32 SCRATCHPAD 5 REGISTER – OFFSET 0B4h

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 5 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

7.6.33 SCRATCHPAD 6 REGISTER – OFFSET 0B8h

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 6 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

PCIe-to-PCI Reversible Bridge Page 132 of 145 Pericom Semiconductor November 2007, Revision 2.4

7.6.34 SCRATCHPAD 7 REGISTER – OFFSET 0BCh

BIT FUNCTION TYPE DESCRIPTION 31:0 Scratchpad 7 RW The scratchpad is a 32-bit inte rnal register that can be accessed from both primary and secondary interfaces. The external devices can use the scratchpad as a temporary storage. Primary and secondary bus devices can communicate through the scratchpad. However, writing and reading the scratchpad does not generate any interrupt request. Reset to 00000000h

7.6.35 RESERVED REGISTERS – OFFSET 0C0h TO 0FCh

7.6.36 LOOKUP TABLE REGISTERS – OFFSET 100h TO 1FCh

BIT FUNCTION TYPE DESCRIPTION 2047:0 Lookup Table RW The lookup table has 64 entries. Each entry has 32-bit mapped to each page of the Upstream Memory 2 base address range 64th page: bit [2047:2016] 63 rd page: bit [2015:1984] 62nd page: bit [1983:1952] 61 st page: bit [1951:1920] 60th page: bit [1919:1888] 59 th page: bit [1887:1856] 58th page: bit [1855:1824] 57 th page: bit [1823:1792] 56th page: bit [1791:1760] 55 th page: bit [1759:1728] 54th page: bit [1727:1696] 53 rd page: bit [1695:1664] 52nd page: bit [1663:1632] 51 st page: bit [1631:1600] 50th page: bit [1599:1568] 49 th page: bit [1567:1536] 48th page: bit [1535:1504] 47 th page: bit [1503:1472] 46th page: bit [1471:1440] 45 th page: bit [1439:1408] 44th page: bit [1407:1376] 43 rd page: bit [1375:1344] 42nd page: bit [1343:1312] 41 st page: bit [1311:1280] 40th page: bit [1279:1248] 39 th page: bit [1247:1216] 38th page: bit [1215:1184] 37 th page: bit [1183:1152] 36th page: bit [1151:1120] 35 th page: bit [1119:1088] 34th page: bit [1087:1056] 33 rd page: bit [1055:1024] 32nd page: bit [1023:992] 31 st page: bit [991:960] 30th page: bit [959:928] 29 th page: bit [927:896] 28th page: bit [895:864] 27 th page: bit [863:832] 26th page: bit [831:800] 25 th page: bit [799:768] 24th page: bit [767:736] 23 rd page: bit [735:704] 22nd page: bit [703:672] 21 st page: bit [671:640] 20th page: bit [639:608] 19 th page: bit [607:576] 18th page: bit [575:544] 17 th page: bit [543:512] 16th page: bit [511:480] 15 th page: bit [479:448] 14th page: bit [447:416] 13 th page: bit [415:383] 12th page: bit [382:352] 11 th page: bit [351:320] 10th page: bit [319:288] 9 th page: bit [287:256] 8th page: bit [255:224] 7 th page: bit [223:192] 6th page: bit [191:160] 5 th page: bit [159:128] 4th page: bit [127:96] 3 rd page: bit [95:64] 2nd page: bit [63:32] 1 st page: bit [31:0] Reset to unknown

7.6.37 RESERVED REGISTERS – OFFSET 200h TO FFCh

PCIe-to-PCI Reversible Bridge Page 133 of 145 Pericom Semiconductor November 2007, Revision 2.4

8 GPIO PINS AND SM BUS ADDRESS

GPIO [3:1] of PI7C9X110 are defined for hot-plug usage if MSK_IN=1 during Reset. Please see configuration register definition (offset 78h – 7Bh). GPIO [3:0] are also defined the address bits of SMBUS device ID if SM Bus is selected (TM1=1). The address- strapping table of SMBUS with GPIO [3:0] pins is defined in the following table: Table 8-1 SM Bus Device ID Strapping SM Bus Address Bit SM Bus device ID Address bit [7] = 1 Address bit [6] = 1 Address bit [5] = 0 Address bit [4] = GPIO [3] Address bit [3] = GPIO [2] Address bit [2] = GPIO [1] Address bit [1] = GPIO [0] GPIO [3:0] pins can be further defined to serve other functions in the next generation Device. Four GPI [3:0] and four GPO [3:0] have been added to PI7C9X110 when external arbiter is selected (CFN_L=1). If external arbiter is selected, REQ_L [5:2] and GNT [5:2] will become the GPI [3:0] and GPO [3:0] respectively.

9 CLOCK SCHEME

PCI Express interface: PI7C9X110 requires 100MHz differential clock inputs through REFCLKP and REFCLKN Pins. PCI-X interface: PI7C9X110 requires PCI-X clock (up to 133MHz) to be connected to the CLKIN. PI7C9X110 uses the CLKIN and generates nine clock outputs, CLKOUT [8:0]. Also, PI7C9X110 requires one of the CLKOUT [8:0] (preferably CLKOUT [8]) to be connected to FBCLKIN for the PCI-X interface logic of PI7C9X110. The actual number of masters supported will vary depending on the loading of the PCI-X bus. Typically, PI7C9X110 can support up to one 133MHz PCI-X slot or two 66MHz PCI-X slots. PCI interface: PI7C9X110 requires PCI clock (up to 66MHz) to be connected to the CLKIN. PI7C9X110 uses the CLKIN and generates nine clock outputs, CLKOUT [8:0]. Also, PI7C9X110 requires one of the CLKOUT [8:0] (preferably CLKOUT [8]) to be connected to FBCLKIN for the PCI interface logic of PI7C9X110. The actual number of masters supported will vary depending on the loading of the PCI bus. Typically, PI7C9X110 can support up to four 66MHz PCI slots or eight 33MHz PCI slots. The PI7C9X110 PCI Clock Outputs, CLKOUT [8:0], can be enabled or disabled through the configuration register.

10 INTERRUPTS

PI7C9X110 supports interrupt message packets on PCIe side. PI7C9X110 supports PCI interrupt (INTA, B, C, D) pins or MSI (Message Signaled Interrupts) on PCI side. PCI interrupts and MSI are mutually exclusive. In order words, if MSI is enabled, PCI interrupts will be disabled. PI7C9X110 support 64-bit addressing MSI.

PCIe-to-PCI Reversible Bridge Page 134 of 145 Pericom Semiconductor November 2007, Revision 2.4 In reverse bridge mode, PI7C9X110 maps the interrupt message packets to PCI interrupt pins or MSI if MSI is enable (see configuration register bit [16] of Offset F0h). In forward bridge mode, PI7C9X110 maps the PCI interrupts pins or MSI if enable on PCI side to interrupt message packets on PCIe side. There are eight interrupt message packets. They are Assert_INTA, Assert_INTB, Assert_INTC, Assert_INTD, Deassert_INTA, Deassert_INTB, Deassert_INTC, and Deassert_INTD. These eight interrupt messages are mapped to the four PCI interrupts (INTA, INTB, INTC, and INTD). See Table 10-1 for interrupt mapping information in reverse bridge mode. PI7C9X110 tracks the PCI interrupt (INTA, INTB, INTC, and INTD) pins and maps them to the eight interrupt messages. See Table 10-2 for interrupt mapping information in forward bridge mode. Table 10-1 PCIe interrupt message to PCI interrupt mapping in reverse bridge mode PCIe Interrupt messages (from sources of interrupt) PCI Interrupts (to host controller) INTA message INTA INTB message INTB INTC message INTC INTD message INTD Table 10-2 PCI interrupt to PCIe interrupt message mapping in forward bridge mode PCI Interrupts (from sources of interrupts) PCIe Interrupt message packets (to host controller) INTA INTA message INTB INTB message INTC INTC message INTD INTD message

11 EEPROM (I2C) INTERFACE AND SYSTEM MANAGEMENT BUS

11.1 EEPROM (I2C) INTERFACE

PI7C9X110 supports EEPROM interface through I2C bus. In EEPROM interface, pin A2 is the EEPROM clock (SCL) and pin A1 is the EEPROM data (SDL). When TM2 is strapped to low, TM1 selects EEPROM interface or System Management Bus. To select EEPROM (I2C) interface, TM1 needs to be set to low. When EEPROM interface is selected, SCL is an output. SCL is the I2C bus clock to the I2C device. In addition, SDL is a bi- directional signal for sending and receiving data.

11.2 SYSTEM MANAGEMENT BUS

PI7C9X110 supports SM bus protocol if TM1=1 when TM2 is strapped to low. In addition, SMBCLK (pin A2) and SMBDAT (pin A1) are utilized as the clock and data pins respectively for the SM bus. When SM bus interface is selected, SMBCLK pin is an input for the clock of SM bus and SMBDAT pin is an open drain buffer that requires external pull-up resistor for proper operation.

12 HOT PLUG OPERATION

PI7C9X110 is not equipped with standard hot-plug controller (SHPC) integrated. However, PI7C9X110 supports hot-plug signaling messages and registers to simplify the implementation of hot-plug system.

PCIe-to-PCI Reversible Bridge Page 135 of 145 Pericom Semiconductor November 2007, Revision 2.4 Using PI7C9X110 on motherboard:

• PI7C9X110 supports hot-plug on PCI bus if forward bridging is selected (REVRSB=0).
• PI7C9X110 supports hot-plug function on PCI Express bus when reverse bridge mode is selected (REVRSB=1). Using PI7C9X110 on add-in card:
• PI7C9X110 supports hot-plug on PCI Express bus in forward bridge mode. Hot-plug messages will be generated by PI7C9X110 based on the add-in card conditions.
• PI7C9X110 supports hot-plug function on PCI bus when reverse bridge mode is selected. PI7C9X110 will tri-state the PCI bus when RESET is asserted. Also, PI7C9X110 will de-assert INTA_L if RESET is asserted. The state machine of PI7C9X110 PCI bus interface will remain idle if the RESET is asserted. After RESET is de-asserted, PI7C9X110 will remain in idle state until an address phase containing a valid address for PI7C9X110 or its downstream devices.
• PI7C9X110 expects the REFCLK signal will be provided to its upstream PCI Express Port prior to the de- assertion of RESET. The Downstream PCI Port of PI7C9X110 supports a range of frequency up to 66MHz.
• PI7C9X110 also supports subsystem vendor and subsystem ID. PI7C9X110 will ignore target response while the bus is idle. PRSNT1# and PRSNT2# are not implemented on both PI7C9X110. The use of these two signals is mandatory on an add-in card in order to support hot-plug.

13 RESET SCHEME

PI7C9X110 requires the fundamental reset (PERST_L) input for internal logic when it is set as forward bridge mode. PI7C9X110 requires the PCI/PCI-X reset (RESET_L) input when it is set as reverse bridge mode. Also, PI7C9X110 has a power-on-reset (POR) circuit to detect VDDCAUX power supply for auxiliary logic control.

• Cold Reset: A cold reset is a fundamental or power-on reset that occurs right after the power is applied to PI7C9X110 (during
• Warm Reset: A warm reset is a reset that triggered by the hardware without removing and re-applying the power sources to PI7C9X110.
• Hot Reset: A hot reset is a reset that used an in-band mechanism for propagating reset across a PCIe link to PI7C9X110. PI7C9X110 will enter to training control reset when it receives two consecutive TS1 or TS2 order-sets with reset bit set.
• DL_DOWN Reset: If the PCIe link goes down, the Transaction and Data Link Layer will enter DL_DOWN status. PI7C9X110 discards all transactions and returns all logic and registers to initial state except the sticky registers. Upon receiving reset (cold, warm, hot, or DL_DOWN) on PCIe interface, PI7C9X110 will generate PCI/PCI-X reset (RESET_L) to the downstream devices on the PCI/PCI-X bus in forward bridge mode. The PCI/PCI-X reset de-assertion follows the de-assertion of the reset received from PCIe interface. The reset bit of Bridge Control Register may be set depending on the application. PI7C9X110 will tolerant to receive and process SKIP order-sets

PCIe-to-PCI Reversible Bridge Page 136 of 145 Pericom Semiconductor November 2007, Revision 2.4 at an average interval between 1180 to 1538 Symbol Times. PI7C9X110 does not keep PCI/PCI-X reset active when VD33 power is off even though VAUX (3.3v) is supported. It is recommended to add a weak pull-down resistor on its application board to ensure PCI/PCI-X reset is low when VD33 power is off (see section 7.3.2 of PCI Bus Power management Specification Revision 1.1). In reverse bridge mode, PI7C9X110 generates fundamental reset (PERST_L) and then 1024 TS1 order-sets with reset bit set when PCI/PCI-X reset (RESET_L) is asserted to PI7C9X110. PI7C9X110 has scheduling skip order- set for insertion at an interval between 1180 and 1538 Symbol Times. PI7C9X110 transmits one Electrical Idle order-set and enters to Electrical Idle. 14 IEEE 1149.1 COMPAT IBLE JTAG CONTROLLER An IEEE 1149.1 compatible Test Access Port (TAP) controller and associated TAP pins are provided to support boundary scan in PI7C9X110 for board-level continuity test and diagnostics. The TAP pins assigned are TCK, TDI, TDO, TMS and TRST_L. All digital input, output, input/output pins are tested except TAP pins. The IEEE 1149.1 Test Logic consists of a TAP controller, an instruction register, and a group of test data registers including Bypass and Boundary Scan registers. The TAP controller is a synchronous 16-state machine driven by the Test Clock (TCK) and the Test Mode Select (TMS) pins. An independent power on reset circuit is provided to ensure the machine is in TEST_LOGIC_RESET state at power-up. The JTAG signal lines are not active when the PCI resource is operating PCI bus cycles.

14.1 INSTRUCTION REGISTER

PI7C9X110 implements a 5-bit Instruction register to control the operation of the JTAG logic. The defined instruction codes are shown in Table 14-1. Those bit combinations that are not listed are equivalent to the BYPASS (11111) instruction: Table 14-1 Instruction register codes Instruction Operation Code (binary) Register Selected Operation EXTEST 00000 Boundary Scan Drives / receives off-chip test data SAMPLE 00001 Boundary Scan Samples inputs / pre-loads outputs HIGHZ 00101 Bypass Tri-states output and I/O pins except TDO pin CLAMP 00100 Bypass Drives pins from boundary-scan register and selects Bypass register for shifts IDCODE 01100 Device ID Accesses the Device ID register, to read manufacturer ID, part number, and version number BYPASS 11111 Bypass Selected Bypass Register INT_SCAN 00010 Internal Scan Scan test MEM_BIST 01010 Memory BIST Memory BIST test

14.2 BYPASS REGISTER

The required bypass register (one-bit shift register) provides the shortest path between TDI and TDO when a bypass instruction is in effect. This allows rapid movement of test data to and from other components on the board. This path can be selected when no test operation is being performed on the PI7C9X110.

14.3 DEVICE ID REGISTER

PCIe-to-PCI Reversible Bridge Page 137 of 145 Pericom Semiconductor November 2007, Revision 2.4 This register identifies Pericom as the manufacturer of the device and details the part number and revision number for the device. Table 14-2 JTAG device ID register Bit Type Value Description 31:28 RO 01h Version number 27:12 RO E110h Last 4 digits (hex) of the die part number 11:1 RO 23Fh Pericom identifier assigned by JEDEC

0 RO 1b Fixed bit equal to 1’b1

14.4 BOUNDARY SCAN REGISTER

The boundary scan register has a set of serial shift-register cells. A chain of boundary scan cells is formed by connected the internal signal of the PI7C9X110 package pins. The VDD, VSS, and JTAG pins are not in the boundary scan chain. The input to the shift register is TDI and the output from the shift register is TDO. There are 4 different types of boundary scan cells, based on the function of each signal pin. The boundary scan register cells are dedicated logic and do not have any system function. Data may be loaded into the boundary scan register master cells from the device input pins and output pin-drivers in parallel by the mandatory SAMPLE and EXTEST instructions. Parallel loading takes place on the rising edge of TCK.

14.5 JTAG BOUNDARY SC AN REGISTER ORDER

Table 14-3 JTAG boundary scar register definition Boundary Scan Register Number Pin Name Ball Location Type Tri-state Control Cell

0 AD [0] K14 BIDIR 1

2 AD [1] J11 BIDIR 3

4 AD [2] J13 BIDIR 5

6 AD [3] J14 BIDIR 7

8 AD [4] H12 BIDIR 9

10 AD [5] H13 BIDIR 11

12 AD [6] G11 BIDIR 13

14 AD [7] G12 BIDIR 15

16 CBE [0] G14 BIDIR 17

18 AD [8] F11 BIDIR 19

20 AD [9] F13 BIDIR 21

22 AD [10] F14 BIDIR 23

24 AD [11] E13 BIDIR 25

26 AD [12] D11 BIDIR 27

28 AD [13] D12 BIDIR 29

PCIe-to-PCI Reversible Bridge Page 138 of 145 Pericom Semiconductor November 2007, Revision 2.4 Boundary Scan Register Number Pin Name Ball Location Type Tri-state Control Cell 29 - - CONTROL -

30 AD [14] D14 BIDIR 31

32 AD [15] C12 BIDIR 33

34 CBE [1] C14 BIDIR 35

36 PAR B13 BIDIR 37

38 SERR_L B14 BIDIR 39

40 PERR_L A14 BIDIR 41

42 LOCK_L A13 BIDIR 43

44 STOP_L A12 BIDIR 45

46 DEVSEL_L B11 BIDIR 47

48 TRDY_L A11 BIDIR 47

49 IRDY_L D10 BIDIR 50

51 FRAME_L B10 BIDIR 52

53 CBE [2] A10 BIDIR 54

55 AD [16] C9 BIDIR 56

57 AD [17] B9 BIDIR 58

59 AD [18] D8 BIDIR 60

61 AD [19] C8 BIDIR 62

63 AD [20] A8 BIDIR 64

65 AD [21] D7 BIDIR 66

67 AD [22] B7 BIDIR 68

69 AD [23] A7 BIDIR 70

71 CBE [3] C6 BIDIR 72

73 AD [24] B6 BIDIR 74

75 AD [25] D5 BIDIR 76

77 AD [26] C5 BIDIR 78

79 AD [27] A5 BIDIR 80

81 AD [28] D4 BIDIR 82

83 AD [29] B4 BIDIR 84

85 AD [30] A4 BIDIR 86

87 AD [31] B3 BIDIR 88

PCIe-to-PCI Reversible Bridge Page 139 of 145 Pericom Semiconductor November 2007, Revision 2.4 Boundary Scan Register Number Pin Name Ball Location Type Tri-state Control Cell

89 PME_L A3 BIDIR 90

91 SMBCLK A2 BIDIR 92

93 SMBDAT A1 BIDIR 94

95 CLKRUN_L D3 BIDIR 96

97 FBCLKIN C2 INPUT -

98 PCIXCAP B1 INPUT -

99 PCIXUP D2 OUTPUT3 100

101 PERST_L L3 BIDIR 102

103 REQ_L [0] M1 INPUT -

104 REQ_L [1] M2 INPUT -

105 REQ_L [2] M3 INPUT -

106 REQ_L [3] N1 INPUT -

107 REQ_L [4] N2 INPUT -

108 REQ_L [5] N3 INPUT -

109 REQ_L [6] P1 INPUT -

110 REQ_L [7] P2 INPUT -

111 INTA_L P3 BIDIR 112

113 GNT_L [0] M4 OUTPUT3 114

115 GNT_L [1] N4 OUTPUT3 122

116 GNT_L [2] L5 OUTPUT3 122

117 GNT_L [3] M5 OUTPUT3 122

118 GNT_L [4] N5 OUTPUT3 122

119 GNT_L [5] P5 OUTPUT3 122

120 GNT_L [6] P6 OUTPUT3 122

121 GNT_L [7] N6 OUTPUT3 122

123 INTB_L M6 BIDIR 124

125 CLKIN P7 INPUT -

126 RESET_L N7 BIDIR 126

128 CFN_L M7 INPUT -

129 GPIO [3] L7 BIDIR 129

131 GPIO [2] P8 BIDIR 131

133 GPIO [1] M8 BIDIR 133

135 GPIO [0] L8 BIDIR 135

137 CLKOUT [0] P9 OUTPUT3 145

138 CLKOUT [1] N9 OUTPUT3 145

139 CLKOUT [2] L9 OUTPUT3 145

140 CLKOUT [3] P10 OUTPUT3 145

141 CLKOUT [4] M10 OUTPUT3 145

142 CLKOUT [5] L10 OUTPUT3 145

143 CLKOUT [6] N11 OUTPUT3 145

144 CLKOUT [7] P12 OUTPUT3 145

145 CLKOUT [8] N12 OUTPUT3 145

147 INTC_L P13 BIDIR 148

PCIe-to-PCI Reversible Bridge Page 140 of 145 Pericom Semiconductor November 2007, Revision 2.4 Boundary Scan Register Number Pin Name Ball Location Type Tri-state Control Cell

149 REVRSB M12 INPUT -

150 INTD_L N13 BIDIR 151

152 MSK_IN P14 INPUT -

153 IDSEL N14 INPUT -

15 POWER MANAGEMENT

PI7C9X110 supports D0, D3-hot, D3-cold Power States. D1 and D2 states are not supported. The PCI Express Physical Link Layer of the PI7C9X110 device supports the PCI Express Link Power Management with L0, L0s, L1, L2/L3 ready and L3 Power States. For the PCI Port of PI7C9X110, it supports the standard PCI Power Management States with B0, B1, B2 and B3. During D3-hot state, the main power supplies of VDDP, VDDC, and VD33 can be turned off to save power while keeping the VDDAUX, VDDCAUX, and VAUX with the auxiliary power supplies to maintain all necessary information to be restored to the full power D0 state. PI7C9X110 has been designed to have sticky registers that are powered by auxiliary power supplies. PME_L pin allows PCI devices to request power management state changes. Along with the operating system and application software, PCI devices can achieve optimum power saving by using PME_L in forward bridge mode. PI7C9X110 converts PME_L signal information to power management messages to the upstream switches or root complex. In reverse bridge mode, PI7C9X110 converts the power management event messages from PCIe devices to the PME_L signal and continues to request power management state change to the host bridge. PI7C9X110 also supports ASPM (Active State Power Management) to facilitate the link power saving. PI7C9X110 supports beacon generation but does not support WAKE# signal.

PCIe-to-PCI Reversible Bridge Page 141 of 145 Pericom Semiconductor November 2007, Revision 2.4

16 ELECTRICAL AND TIMING SPECIFICATIONS

16.1 ABSOLUTE MAXIMUM RATINGS

Table 16-1 Absolute maximum ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Storage Temperature -65 oC to 150oC Ambient Temperature with power appiled 0 oC to 85oC PCI Express supply voltage to ground potential (VDDA, VDDP, VDDC, VDDAUX, and VDDCAUX) -0.3v to 3.0v PCI supply voltage to ground potential (VD33 and VAUX) -0.3v to 3.6v DC input voltage for PCI Express signals -0.3v to 3.0v DC input voltage for PCI signals -0.5v to 5.75v Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

16.2 DC SPECIFICATIONS

Table 16-2 DC electrical characteristics Power Pins Min. Typ. Max. VDDA 1.6v 1.8v 2.0v VDDP 1.6v 1.8v 2.0v VDDC 1.6v 1.8v 2.0v VDDAUX 1.6v 1.8v 2.0v VDDCAUX 1.6v 1.8v 2.0v VTT VDDC VDDC 2.0v VD33 3.0v 3.3v 3.6v VAUX 3.0v 3.3v 3.6v VDDA: analog power supply for PCI Express Interface VDDP: digital power supply for PCI Express Interface VDDAUX: digital auxiliary power supply for PCI Express Interface VTT: termination power supply for PCI Express Interface VDDC: digital power power supply for the core VDDCAUX: digital auxiliary power supply for the core VD33: digital power supply for PCI/PCI-X interface VAUX: digital auxiliary power supply for PCI/PCI-X interface In order to support auxiliary power management fully, it is recommended to have VDDP and VDDAUX separated. By the same token, VD33/VDDC and VAUX/VDDCAUX need to be separated for auxiliary power management support. However, if auxiliary power management is not required, VD33 and VDDC can be connected to VAUX and VDDCAUX respectively. The typical power consumption of PI7C9X110 is about 1.0 watt.

PCIe-to-PCI Reversible Bridge Page 142 of 145 Pericom Semiconductor November 2007, Revision 2.4 PI7C9X110 is capable of sustaining 1500V human body model for the ESD protection without any damages.

16.3 AC SPECIFICATIONS

Table 16-3 PCI bus timing parameters

66 MHz 33 MHz Symbol Parameter

Tsu Input setup time to CLK – bused signals 1,2,3 3 - 7 - Tsu (ptp) Input setup time to CLK – point-to-point 1,2,3 5 - 10, 12 4 - Th Input signal hold time from CLK 1,2 0 - 0 - Tval CLK to signal valid delay – bused signals 1,2,3 2 6 2 11 Tval (ptp) CLK to signal valid delay – point-to-point 1,2,3 2 6 2 12 Ton Float to active delay 1,2 2 - 2 - Toff Active to float delay 1,2 - 14 - 28 ns 1. See Figure 16 –1 PCI Signal Timing Measurement Conditions. 2. All PCI interface signals are synchronized to FBCLKIN. 3. Point-to-point signals are REQ_L [7:0], GNT_L [7:0], LOO, and ENUM_L. Bused signals are AD, CBE, PAR, PERR_L, SERR_L, FRAME_L, IRDY_L, TRDY_L, LOCK_L, STOP_L and IDSEL. 4. REQ_L signals have a setup of 10ns and GNT_L signals have a setup of 12ns. Figure 16-1 PCI signal timing conditions

PCIe-to-PCI Reversible Bridge Page 143 of 145 Pericom Semiconductor November 2007, Revision 2.4

17 PACKAGE INFORMATION

Figure 17-1 Top view drawing Figure 17-2 Bottom view drawing

PCIe-to-PCI Reversible Bridge Page 144 of 145 Pericom Semiconductor November 2007, Revision 2.4 The package of PI7C9X110 is a 12mm x 12mm LFBGA (160 Pin) package. The ball pitch is 0.8mm and the ball size is 0.5mm. The following are the package information and mechanical dimension: Figure 17-3 Package outline drawing

18 ORDERING INFORMATION

PART NUMBER PIN – PACKAGE PB-FREE & GREEN TEMPERATURE RANGE PI7C9X110BNBE 160 – LFBGA YES -40 TO +85C

PCIe-to-PCI Reversible Bridge Page 145 of 145 Pericom Semiconductor November 2007, Revision 2.4 NOTES: