PI7C9X2G304SV

Diodes Incorporated

Gen2 PCIe짰 3-Port/4-Lane ExtremeLo Packet Switch 2011

Manufacturer: Diodes Incorporated

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Document Number DS41218 Rev 11-2 PI7C9X2G304SV PCI EXPRESS GEN 2 PACKET SWITCH 3-Port, 4-Lane, ExtremeLo PCIe 2.0 Packet Switch DATASHEET REVISION 11 June 2025

1545 Barber Lane Milpitas, CA 95035

Telephone: 408-232-9100 FAX: 408-434-1040 Internet: https://www.diodes.com

PI7C9X2G304SV Page 2 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV IMPORTANT NOTICE 1. DIODES INCORPORATED (Diodes) AND ITS SUBSIDIARIES MAKE NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO ANY INFORMATION CONTAINED IN THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON -INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 2. The Information contained herein is for informational purpose only and is provided only to illustrate the operation of Diodes ’ products described herein and application examples. Diodes does not assume any liability arising out of the application or use of this document or any product described herein. This document is intended for skilled and technically trained engineering customers and users who design wi th Diodes’ products. Diodes’ products may be used to facilitate safety -related applications; however, in all instances customers and users are responsible for (a) selecting the appropriate Diodes products for their applications, (b) evaluating the suitability of Diodes’ products for their intended applications, (c) ensuring their applications, which incorporate Diodes’ products, comply the applicable legal and regulatory requirements as well as safety and functional-safety related standards, and (d) ensuring they design with appropriate safeguards (including testing, validation, quality control technique s, redundancy, malfunction prevention, and appropriate treatment for aging degradation) to minimize the risks associated with their applications. 3. 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Notwithstanding the foregoing, Diodes reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any produ ct described herein. This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the final and determinative format released by Diodes. 8. Any unauthorized copying, modification, distribution, transmission, display or other use of this document (or any portion hereof) is prohibited. Diodes assumes no responsibility for any losses incurred by the customers or users or any third parties arising from any such unauthorized use. 9. This Notice may be periodically updated with the most recent version available at https://www.diodes.com/about/company/terms-and- conditions/important-notice The Diodes logo is a registered trademark of Diodes Incorporated in the United States and other countries. All other trademarks are the property of their respective owners. © 2025 Diodes Incorporated. All Rights Reserved. www.diodes.com

REVISION HISTORY

Date Revision Number Description 02/08/2017 0.1 Preliminary Datasheet 07/11/2018 1 Reg40h[15:8] next item point to 4ch for both up/downport port MSI register are for both up&downport, not downport only anymore Multiple Message Capable modify form 3b'001 to 3'b010 Update 74h[7], 8Ch[7][12]. Update 340h[4][5] Add cfg offset 300h to 314h Update 8Ch[12] Add cfg offset 318h and 31Ch Update 98h[15:0] Update REG[9c]: trigger[6:3], clear[2], port[1:0], and REG[a0] Update Ini for REG[98][15:0] = 0126 Add cfg offset B0h to FFh Delete Misc Control 5 (offset 314h) Updated section 14 Ordering Information Updated 7.2.54 OPERATION MODE –OFFSET 98h Added Fig 13-3 Part Marking Update Feature Add Chap 6.2 and 6.3 Add Chap 13 Update Table 9-3 Update Table 12-1 10/23/2018 2 Updated Section 1 Features Updated Section 12.4 Power Consumption 12/26/2018 3 Updated 3.2 PORT CONFIGURATION SIGNALS Updated Section 7.2.125 MISC CONTROL 0 REGISTER – OFFSET 300h Updated Section 7.2.126 MISC CONTROL 1 REGISTER – OFFSET 304h Updated Section 10 POWER MANAGEMENT Updated Section 12.1 Absolute Maximum Ratings 02/20/2019 4 New revision number due to document control process 09/11/2019 5 Updated Section 12.4 Power Consumption Updated Section 15 Ordering Information 10/24/2019 6 Updated Section 1 Features Updated Section 3.1 PCI Express Interface Signals Updated Table 5-2 Receiver Signal Detect Threshold Updated Figure 14-2 Part Marking 07/21/2020 7 Updated Section 8 Clock Scheme Updated Section 5-1 Physical Layer Circuit Updated Table 6-1, 6-3, 6-5 and 6-6 Updated Figure 6-6 and 6-9 Updated Section 6.1.4 and 7.2.2 Updated Notes for Table 12-2 DC Electrical Characteristics 12/15/2020 8 For Datasheet Status Change 08/10/2022 9 Updated Section 1 FEATURES Updated Section 3.1 PCI EXPRESS INTERFACE SIGNALS Updated Table 5-3 Updated Section 7.2.47 PHY PARAMETER 2 – OFFSET 7Ch Updated Section 7.2.50 XPIP_CSR5 – OFFSET 88h Updated Section 7.2.68 LINK CONTROL REGISTER – OFFSET D0h Updated Section 8 Clock Scheme Updated Figure 14-1 Package Outline Drawing Updated Figure 14-2 Part Marking Updated 6.1.3 EEPROM Space Address Map Updated 6.1.4 Mapping EEPROM Contents to Configuration Updated Table 6-1, 6-3 and 6-5 Removed MEMORY ECC ERROR MASK AND STATUS Register Updated Section 15 Ordering Information

PI7C9X2G304SV Page 4 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Date Revision Number Description Updated Section 7.2.51 TL_CSR0 – OFFSET 8Ch Added Section 7.2.138 DEBUGOUT CONTROL – OFFSET 348h Added Section 7.2.139 DEBUGOUT DATA – OFFSET 34Ch 12/02/2024 10 Updated Table 6-1 SMBus Address Pin Configuration Updated Table 6.1.4 MAPPING EEPROM CONTENTS TO CONFIGURATION REGISTERS Updated Section 7.2.51 TL_CSR0 – OFFSET 8Ch Updated Section 4.1 Pin name- AC1 PORTSTSTUS_L1.1_SEL to PORTSTATUS_L1.1_SEL Updated Section 7.2.60 EEPROM CONTROL REGISTER – OFFSET BCh (Upstream Port Only) Updated Section 7.2.135 LTSSM_CSR – OFFSET 33Ch 06/03/2025 11 Updated Pin Description

1 FEATURES

4-lane PCI Express® Gen 2 Switch with 3 PCI Express ports
Supports “Cut-through”(Default) as well as “Store and Forward” mode for packet switching
Peer-to-peer switching between any two downstream ports
150 ns typical latency for packet routed through Switch without blocking
Integrated reference clock for downstream ports
Strapped pins configurable with optional EEPROM or SMBus
SMBus interface support
Compliant with System Management (SM) Bus, Version 1.0
Compliant with PCI Express Base Specification Revision 2.1
Compliant with PCI Express CEM Specification Revision 2.0
Compliant with PCI-to-PCI Bridge Architecture Specification Revision 1.2
Compliant with Advanced Configuration Power Interface (ACPI) Specification
Reliability, Availability and Serviceability - Supports Data Poisoning and End-to-End CRC - Advanced Error Reporting and Logging - IEEE 1149.1 JTAG interface support
Advanced Power Saving - Empty downstream ports are set to idle state to minimize power consumption
Link Power Management - Supports L0, L0s, L1, L2, L2/L3Ready and L3 link power states - Supports PCI-PM L1.1 and ASPM L1.1 of L1 PM Sub-state - Active state power management for L0s and L1 states
Device State Power Management - Supports D0, D3Hot and D3Cold device power states - 3.3V Aux Power support in D3Cold power state
Port Arbitration: Round Robin (RR), Weighted RR and Time-based Weighted RR
Extended Virtual Channel capability - Two Virtual Channels (VC) and Eight Traffic Class (TC) support - Disabled VCs’ buffer is assigned to enabled VCs for resource sharing - Independent TC/VC mapping for each port - Provides VC arbitration selections: Strict Priority, Round Robin (RR) and Programmable Weighted RR
Supports Isochronous Traffic - Isochronous traffic class mapped to VC1 only - Strict time based credit policing
Supports up to 512-byte maximum payload size
Programmable driver current and de-emphasis level at each individual port
Support Access Control Service (ACS) for peer-to-peer traffic
Support Address Translation (AT) packet for SR-IOV application
Support OBFF and LTR
Support Surprise Hot-Plug (DPC)
Low Power Dissipation: 300 mW typical in L0 normal mode
Industrial Temperature Range -40o to 85oC
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
For automotive applications requiring specific change control (i.e. parts qualified to AEC -Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
128-pin LQFP 14mm x 14mm package Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen - and Antimony -free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000 ppm antimony compounds.

2 GENERAL DESCRIPTION

Similar to the role of PCI/PCIX Bridge in PCI/PCIX bus architecture, the function of PCI Express (PCIE) Switch is to expand the connectivity to allow more end devices to be reached by host controllers in PCIE serial interconnect architecture. The 4-Lane PCIe Switch is in 3-Port type configuration. It provides users the flexibility to expand or fan -out the PCI Express lanes based on their application needs. In the PCI Express Architecture , the PCIE Switch forwards posted and non-posted requests, and completion packets in either downstream or upstream direction concurrently as if a virtual PCI Bridge is in operation on each port. By visualizing the port as a virtual Bridge, the Switch can be logically viewed as two -level cascaded multiple virtual PCI -to-PCI Bridges, where one upstream-port Bridge sits on all downstream-port Bridges. S imilar to a PCI Bridge during enumeration, each port is given a unique bus number , device number, and function number by the initiating software. The bus number, device number, and function number are combined to form a destination ID for each specific port. In addition to that, the memory -map and IO address range s are exclusively allocated to each port as well. After the software enumeration is finished, the packets are routed to the dedicated port based on the embedded address or destination ID. To ensure the packet integrity during forwarding, the Switch is not allowed to split the packet s to multiple small packets or merge the receiv ed packets into a large transmit packet. Also, the IDs of the requesters and completers are kept unchanged along the path between ingress and egress port. The Switch employs the architecture of Combined Input and Output Queue (CIOQ) in implementation. The main reason for choosing CIOQ is that the required memory bandwidth of input queue equals to the bandwidth of ingress port rather than increasing proportionally with port numbers as an output queue Switch does. The CIOQ at each ingress port contains separate dedicated queues to store packets. The packets are arbitrated to the egress port based on the PCIe transaction-ordering rule. For the packets without ordering information, they are permitted to pass over each other in case that the addressed egress po rt is available to accept them. As to the packets required to follow the ordering rule, the Head-Of-Line (HOL) issue becomes unavoidable for packets destined to different egress ports since the operation of producer -consumer model has to be retained; otherwise the system might occur hang-up problem. On the other hand, the Switch places replay buffer at each egress port to defer the packets before sending it out. This can assure the maximum throughput being achieved and therefore the Switch works efficiently. Another advantage of implementing CIOQ in PCIe Switch is that the credit announcement to the counterpart is simplified and streamlined because of the credit -based flow control protocol. The protocol requires that each ingress port maintains the credits independently without checking other ports' credit availability, which is otherwise required by pure output queue architecture. The Switch supports two virtual channels (VC0, VC1) and eight traffic classes (TC0 ~ TC7) at each port. The ingress port independently assigns packets into the preferred virtual channel while the egress port outputs the packet based on the predefined port and VC arbitration algorithm. For instance, the isochronous packet is given a special traffic class number other than TC0 and mapped into VC1 accordingly. By employing the strict time based credit policy for port arbitration and assigning higher priority to VC1 than VC0, the Switch can therefore guarantee the time -sensitive packet is not blocked by regular traffic to assure the quality of service. In addition, some data-centric applications only carry TC0/VC0 traffic. As a result, there are no packets that would consume VC1 bandwidth. In order to improve the efficiency of buffer usage, the unused VC1 queues can be reassigned to VC0 and enable each of the ingress ports to handle more data traffic bursts. This virtual channel resource relocation feature enhances the performance of the PCIe Switch further. The Switch provides the advanced feature of Access Control Service (ACS). This feature regulates which components are allowed to communicate with each other within the PCIe multiple -point fabric, and allows the system to have more control over packet routing in the Switch. As a result, peer-to-peer traffic can be facilitated more accurately and efficiently. When the system also implements Address Translation Service (ATS), the peer -to-peer requests with translated address can be routed directly by enabling the corresponding option in ACS to avoid possible performance bottleneck associated with re -direction, which introduces extra latency and may increase link and RC congestion. The built-in Integrated Reference Clock Buffer of the PCI Express Switch supports four reference clock outputs. The clock buffer is from a single 100MHz clock input, and distributes the clock source to three outputs, which can be used by the downstream PCI Express end devices. The clock buffer feature can be enabled and disabled by strapping pin setting.

PI7C9X2G304SV Page 13 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV The PI7C9X2G304SV supports various types of power management ranged from device state, link state to platform -wise power saving mechanism. For device state, the D0, D1, D2, D3-hot, and D3-cold power states represent different amount of power dissipation in PI7C9X2G304SV. As to link state, each link of the PI7C9X2G304SV supports the PCI Express Link Power Management with L 0, L0s, L1, L 2/L3 ready and L2/L3 power states. In addition, PCI -PM L1.1 of L1 PM Sub -state and device-specific L2/L3 are implemented to reduce power consumption further.

3 PIN DESCRIPTION

3.1 PCI EXPRESS INTERFACE SIGNALS

PIN NAME PIN NUMBER TYPE DESCRIPTION REFCLKP REFCLKN 110, 111 I Reference Clock Input Pair: Connect to 100MHz differential clock when integrated reference clock buffer is disabled ( CLKBUF_PD=1), or connect to one of the Integrated Reference Clock Output Pairs ( REFCLKO_P and REFCLKO_N) of this Switch when integrated reference clock buffer is enabled (CLKBUF_PD=0). The input clock signals must be delivered to the clock buffer cell through an AC - coupled interface so that only the AC information of the clock is received, converted, and buffered. It is recommended that a 0.1uF be used in the AC-coupling. PERP [3:0] 122, 102, 97, 128 I PCI Express Data Serial Input Pairs: Differential data receive signals in four ports. Port 0 (Upstream Port) Lane 0 is PERP[0] and PERN[0] Port 0 (Upstream Port) Lane 1 is PERP[3] and PERN[3] Port 1 (Downstream Port) is PERP[1] and PERN[1] Port 2 (Downstream Port) is PERP[2] and PERN[2] PERN [3:0] 121, 103, 98, 127 I PETP [3:0] 118, 106, 100, 124 O PCI Express Data Serial Output Pairs: Differential data transmit signals in four ports. Port 0 (Upstream Port) Lane 0 is PETP[0] and PETN[0] Port 0 (Upstream Port) Lane 1 is PETP[3] and PETN[3] Port 1 (Downstream Port) is PETP[1] and PETN[1] Port 2 (Downstream Port) is PETP[2] and PETN[2] PETN [3:0] 117, 107, 101, 123 O PERST_L 10 I System Reset (Active LOW): When PERST_L is asserted, the internal states of whole chip except sticky logics are initialized. Please refer to Table 12-2 for PERST_L spec. DWNRST_L[2:1] 6, 5 O Downstream Device Reset (Active LOW): DWNRST_L provides a reset signal to the devices connected to the downstream ports of the switch. The signal is active when either PERST_L is asserted or the device is just plugged into the switch . DWNRST_L [x] corresponds to Portx, where x= 1,2. REXT 116 I External Reference Resistor : Connect an external resistor (1.43K Ohm +/ - 1%) to REXT_GND to provide a reference to both the bias currents and impedance calibration circuitry. REXT_GND 115 I External Reference Resistor Ground: Connect to an external resistor to REXT. REFCLKI_P, REFCLKI_N 74, 73 I Integrated Reference Clock Input Pair : Connect to external 100MHz differential clock for the integrated reference clock buffer. REFCLKO_P[2:0] 78, 81, 85 O Integrated Reference Clock Output Pairs: 100MHz external differential HCSL clock outputs for the integrated reference clock buffer. REFCLKO_N[2:0] 77, 80, 83 O CLKBUF_PD 60 I Reference Clock Output Pairs Power Down: When CLKBUF_PD is asserted high, the integrated reference clock buffer and Reference Clock Outputs are disabled. When it is asserted low, the integrated reference clock buffer and Refe rence Clock Outputs are enabled. This pin has internal pull -down. If no board trace is connected to this pin, the internal pull-down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330-ohm pull-down resistor be used.

3.2 PORT CONFIGURATION SIGNALS

PIN NAME PIN NUMBER TYPE DESCRIPTION VC1_EN 18 I Virtual Channel 1 Resource Sharing Enable: The chip provides the capability to support virtual channel 1 (VC1), in addition to the standard virtual channel 0. When this pin is asserted high, Virtual Channel 1 is enabled, and virtual channel resource sharing is not available. When it is asserted low, the chip would allocate the additional VC1 resource to VC0, and VC1 capability is disabled. This pin has internal pull -down resistor. If no board trace is connected to this pin, the internal pull -down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330 -ohm pull -down resistor be used. RXPOLINV_DIS 24 I Rx Polarity Inversion Disable : When RXPOLINV_DIS is asserted high, it indicates to disable Rx Polarity Inversion detection function. Otherwise, it indicates to enable Rx Polarity Inversion detection function. This pin has internal pull -down resistor. If no board trace is connected to this pin, the internal pull -down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330 -ohm pull -down resistor be used. PL_512B 53 I Max. Payload Size 512B : When PL_512B is asserted high, it indicates the max. payload size capability is 512B. Otherwise, it indicates the max. Payload size is 256B. This pin has internal pull -down resistor. If no board trace is connected to this pin, the internal pull -down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330 -ohm pull -down resistor be used. PRSNT[2:1] 20, 19 I Present: When PRSNT is asserted low, it indicates that the device is present in the slot of downstream port. Otherwise, it indicates the absence of the device. PRSNT[x] is correspondent to Port x, where x=1,2. These pins have internal pull-down resistors. If no board trace is connected to these pins, the internal pull -down resistors of these pins are enough. However, if pin s are connected to a board trace and not driven, it is recommended that external 330 -ohm pull-down resistors be used. SLOTCLK 33 I Slot Clock Configuration : It determines if the downstream component uses the same physical reference clock that the platform provides on the connector. When SLOTCLK is high, the platform reference clock is employed. This pin has internal pull -down resistor. If no board trace is connected to this pin, the internal pull -down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330 -ohm pull -down resistor be used. SLOT_IMP[2:1] 46, 45 I Slot Implemented: These signals are asserted to indicate that the downstream ports are connected to slots. SLOT_IMP[x] corresponds to Portx, where x= 1,2. When SLOT_IMP[x] is asserted, the Portx is connected to slot. Otherwise, it is chip -to-chip connection directly. These pins have internal pull -down resistors. If no board trace is connected to these pins, the internal pull -down resistors of these pins are enough. However, if pins are connected to a board trace and not driven, it is recommended that external 330 -ohm pull-down resistors be used. CLKREQ_L[2:0] PORTSTATUS[2:0] 69, 68, 67 I/O O Clock Request (Active Low): When PORTSTATUS_L1.1_SEL is set LOW, the chip provides the capability to support PM L1 Substate, which requires a side -band clock request signal to control reference clock and PLL. When de -asserted, both of reference clock and PLL are turned off for entering PM L1 Substate to save power. When asserted, the reference clock becomes valid to enable PLL and power state exits L1 Substate. Please refer to Section 8 Clock Scheme. Port Status: When PORTSTATUS_L1.1_SEL is set HIGH, these signals indicate the status of each port. Please connect to pin header for debug used. PORTSTATUS[x] is correspondent to Port x, where x=0,1,2.

3.3 MISCELLANEOUS SIGNALS

PIN NAME PIN NUMBER TYPE DESCRIPTION EECLK 70 O EEPROM Clock: Clock signal to the EEPROM interface. EEPD *71 I/O EEPROM Data: Bi-directional serial data interface to and from the EEPROM. EEPROM Bypass(EEPROM_BYPASS): Duri ng system initialization, EE PD acts as the EEPROM_BYPASS pin. When tied low, eeprom function is disabled. When tied high, eeprom function is enabled. The pin has internal pull -up resistor. If no board trace is connected to this pin, the internal pull-up resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 5.1K -ohm pull-up resistor be used. SMBCLK 26 I SM Bus Clock: System management Bus Clock . This pin requires an external 5.1K - ohm pull-up resistor. SMBDATA 27 I/O SM Bus Data: Bi-Directional System Management Bus Data . This pin requires an external 5.1K-ohm pull-up resistor. SCAN_EN 72 I/O Full-Scan Enable Control: For normal operation, SCAN_EN is an output with a value of “0”. SCAN_EN becomes an input during manufacturing testing. 38, 37, 35, 36 I/O General Purpose Input and Output: These eight general -purpose pins are programmed as either input -only or bi -directional pins by writing the GPIO output enable control register. When SMBus is implemented, GPIO[7:5] act as the SMBus address pins, which set Bit 2 to 0 of the SMBus address. Debug Mode Selection: In debug mode, GPIO[4:0] are used for Debug Mode Selection. PWR_SAV 28 I Power Saving Mode: When PWR_SAV is asserted high, power saving mode is enabled. Otherwise, it power saving mode is disabled. This pin has internal pull -up resistor. If no board trace is connected to this pin, the internal pull-up resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 5.1K-ohm pull-up resistor be used. PORTSTATUS_ L1.1_SEL 22 I PortStatus_L1.1_SEL: When tied low, L1.1 function is enabled. When tied high, PortStatus output mode is enabled. The pin has internal pull -down resistor. If no board trace is connected t o this pin, the internal pull -down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330-ohm pull -down resistor be used. SMBUS_EN 54 I System Manage Bus Enable: Select either SMBUS or I2C protocol. When tied low, I2C protocol is selected. When tied high, SMBUS protocol is chosen. The pin has internal pull -down resistor. If no board trace is connected t o this pin, the internal pull -down resistor of this pin is enough. However, if pin is connected to a board trace and not driven, it is recommended that an external 330-ohm pull -down resistor be used. TEST3 TEST5 TEST6 I Test3/5/6: These pins are for internal test purpose. Test3, Test5 and Test6 should be tied to ground through a 330-ohm pull-down resistor. TEST1 9 I Test1: The pin is for internal test purpose. It should be tied to 3.3V through a 5.1K- ohm pull-up resistor for normal operation. Debug Mode Enable: In debug mode, it need be tired to low through a 330-ohm pull- down resistor. TEST2 16 I Test2: The pin is for internal test purpose. Test2 should be tied to 3.3V through a 5.1K-ohm pull-up resistor. NC 7, 21, 47, 48, 52, 57, 58, 59, 75, 76, 86, 114 Not Connected: These pins can be just left open.

3.4 JTAG BOUNDARY SCAN SIGNALS

PIN NAME PIN NUMBER TYPE DESCRIPTION TCK 89 I Test Clock: Used to clock state information and data into and out of the chip during boundary scan. When JTAG boundary scan function is not implemented, this pin should be left open (NC). TMS 92 I Test Mode Select : Used to control the state of the Test Access Port controller . When JTAG boundary scan function is not implemented, this pin should be pulled low through a 330-Ohm pull-down resistor. TDO 88 O Test Data Output : Used (in conjunction with TCK) to shift data out of the Test Access Port (TAP) in a serial bit stream. When JTAG boundary scan function is not implemented, this pin should be left open (NC). TDI 93 I Test Data Input : Used (in conjunction with TCK) to shift data and instructions into the TAP in a serial bit stream. When JTAG boundary scan function is not implemented, this pin should be left open (NC). TRST_L 94 I Test Reset (Active LOW) : Active LOW signal to reset the TAP controller into an initialized state. When JTAG boundary scan function is not implemented, this pin should be pulled low through a 330-Ohm pull-down resistor.

3.5 POWER PINS

PIN NAME PIN NUMBER TYPE DESCRIPTION VDDC 3, 23, 29, 31, 40, 55, 62, 65, P VDDC Supply (1.0V): Used as digital core power pins. VDDR 1, 8, 49, 64, 96 P VDDR Supply (3.3V): Used as digital I/O power pins. CVDDR 79, 82, 84 P VDDR Supply (3.3V): Used as reference clock power pins. VDDCAUX 13, 14 P VDDCAUX Supply (1.0V): Used as auxiliary core power pins same as VDDC. VAUX 15 P VAUX Supply (3.3V): Used as auxiliary I/O power pins. AVDD 99, 105, 108, 119, 125 P AVDD Supply (1.0V): Used as PCI Express analog power pins. AVDDH 113 P AVDDH Supply (3.3V): Used as PCI Express analog high voltage power pins. CGND 109, 112 P Ground: Used as reference clock ground pins. VSS 2, 4, 11, 12, 30, 32, 34, 41, 50, 56, 61, 63, 66, 87, 90, 95, 104, 120, 126,129 P VSS Ground: Used as ground pins.

4 PIN ASSIGNMENTS

4.1 PIN LIST of 128-PIN LQFP

PIN NAME PIN NAME PIN NAME PIN NAME

1 VDDR 33 SLOTCLK 65 VDDC 97 PERP[1]

2 VSS 34 VSS 66 VSS 98 PERN[1]

3 VDDC 35 GPIO[1] 67 CLKREQ_L[0] 99 AVDD

4 VSS 36 GPIO[0] 68 CLKREQ_L[1] 100 PETP[1]

5 DWNRST_L[1] 37 GPIO[2] 69 CLKREQ_L[2] 101 PETN[1]

6 DWNRST_L[2] 38 GPIO[3] 70 EECLK 102 PERP[2]

7 NC 39 GPIO[4] 71 EEPD 103 PERN[2]

8 VDDR 40 VDDC 72 SCAN_EN 104 VSS

9 TEST1 41 VSS 73 REFCLKI_N 105 AVDD

10 PERST_L 42 GPIO[5] 74 REFCLKI_P 106 PETP[2]

11 VSS 43 GPIO[6] 75 NC 107 PETN[2]

12 VSS 44 GPIO[7] 76 NC 108 AVDD

13 VDDCAUX 45 SLOT_IMP[1] 77 REFCLKO_N[2] 109 CGND

14 VDDCAUX 46 SLOT_IMP[2] 78 REFCLKO_P[2] 110 REFCLKP

15 VAUX 47 NC 79 CVDDR 111 REFCLKN

16 TEST2 48 NC 80 REFCLKO_N[1] 112 CGND

17 TEST3 49 VDDR 81 REFCLKO_P[1] 113 AVDDH

18 VC1_EN 50 VSS 82 CVDDR 114 NC

19 PRSNT[1] 51 TEST6 83 REFCLKO_N[0] 115 REXT_GND

20 PRSNT[2] 52 NC 84 CVDDR 116 REXT

21 NC 53 PL_512B 85 REFCLKO_P[0] 117 PETN[3]

22 PORTSTATUS_L1.1_SEL 54 SMBUS_EN 86 NC 118 PETP[3]

23 VDDC 55 VDDC 87 VSS 119 AVDD

24 RXPOLINV_DIS 56 VSS 88 TDO 120 VSS

25 TEST5 57 NC 89 TCK 121 PERN[3]

26 SMBCLK 58 NC 90 VSS 122 PERP[3]

27 SMBDATA 59 NC 91 VDDC 123 PETN[0]

28 PWR_SAV 60 CLKBUF_PD 92 TMS 124 PETP[0]

29 VDDC 61 VSS 93 TDI 125 AVDD

30 VSS 62 VDDC 94 TRST_L 126 VSS

31 VDDC 63 VSS 95 VSS 127 PERN[0]

32 VSS 64 VDDR 96 VDDR 128 PERP[0]

129 E_PAD

5 FUNCTIONAL DESCRIPTION

Multiple virtual PCI -to-PCI Bridges (VPPB), connected by a virtual PCI bus, reside in the Switch. Each VPPB contains the complete PCIe architecture layers that consist of the physical, da ta link, and transaction layer. The packets entering the Switch via one of VPPBs are first converted from serial bit -stream into parallel bus signals in physical layer, stripped off the link-related header by data link layer, and then relayed up to the transaction layer to extract out the transaction header. According to the address or ID embedded in the transaction header, the entire transaction packets are forwarded to the destination VPPB for formatting as a serial -type PCIe packet through the transmit circuits in the data link layer and physical layer. The following sections describe these function elements for processing PCIe packets within the Switch.

5.1 PHYSICAL LAYER CIRCUIT

The physical layer circuit design is based on the PHY Interface for PCI Express Archi tecture (PIPE). It contains Physical Media Attachment (PMA) and Physical Coding Sub -layer (PCS) blocks. PMA includes Serializer/ Deserializer (SERDES), PLL1, Clock Recovery module, receiver detection circuits, beacon transmitter, electrical idle detector , and input/output buffers. PCS consists of framer, 8B/10B encoder/decoder, receiver elastic buffer , and PIPE PHY control/status circuitries. To provide the flexibility for port configuration, each lane has its own control and status signals for MAC to access individually. The main functions of physical layer circuits include the conversion between serial -link and parallel bus, provision of clock source for the Switch, resolving clock difference in receiver end, and detection of physical layer errors. In order to meet the needs of different application, the drive amplitude, de -emphasis and equalization of each transmitting channels can be adjusted using EEPROM individually. De -emphasis of -3.5 db is implemented by the transmitters when full swing signaling is used, while an offset can be individually applied to each channel.

5.1.1 RECEIVER DETECTION

The physical layer circuits implement receiver detection, which detects the presence of an attached 50 ohm to ground termination as per PCI Express Specification. The detect circuits determine if the voltage levels of the receiver have crosse d the internal threshold after a configurable time determined by the Receiver Detection Threshold field in the PHY Parameter 2 Register (offset 7Ch, bit[6:4]) as listed in Table 5-1, which can be configured by EEPROM or SMBUS settings. Table 5-1 Receiver Detection Threshold Settings Receiver Detection Threshold Threshold 000 1.0 us 001 2.0 us 010 4.0 us (Recommended) 011 5.0 us 100 10 us 101 20 us 110 40 us 111 50 us

5.1.2 RECEIVER SIGNAL DETECTION

Receiver signal idling is detected with levels above a programmable threshold specified by Receiver Signal Detect field in the PHY Parameter 2 Register (Offset 7Ch, bit[21:20]) as listed in Table 5-2, which can be configured on a per -port basis via EEPROM or SMBUS settings. 1 Multiple lanes could share the PLL.

PI7C9X2G304SV Page 20 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Table 5-2 Receiver Signal Detect Threshold Receiver Signal Detect Min (mV ppd) Max (mV ppd) 00 50 150 01 (Recommended) 65 175 10 75 200 11 120 240

5.1.3 RECEIVER EQUALIZATION

The receiver implements programmable equalizer via the Receiver Equalization field in the P HY Parameter 2 Register (Offset 7Ch, bit[25:22]) as listed in Table 5-3, which can be configured on a per-port basis via EEPROM or SMBUS settings. Table 5-3 Receiver Equalization Settings Receiver Equalization Equalization 0000 (Recommended) Off

0010 Low

0110 Medium

1110 High

5.1.4 TRANSMITTER SWING

The PCI Express transmitters support implementations of both full voltage swing and half (low) voltage swing. In full swing signaling mode, the transmitters implement de -emphasis, while in half swing mode, the transmitters do not. The Transmitter Swing field in the PHY Parameter 2 Register (offset 7Ch, Bit[30]) is used for the selection of full swing signaling or half swing signaling, which can be configured on a per-port basis via EEPROM or SMBUS settings. Table 5-4 Transmitter Swing Settings Transmitter Swing Mode De-emphasis

0 Full Voltage Swing Implemented

1 Half Voltage Swing Not implemented

5.1.5 DRIVE AMPLITUDE AND DE-EMPHASIS SETTINGS

Depending on the operation condition (voltage swing and de -emphasis condition), one of the Drive Amplitude Base Level fields in the Switch Operation Mode Register (offset 74h) and one of the Drive De -Emphasis Base Level fields in the PHY Parameter 1 Register (offset 7Ah) are active for configuration of the amplitude and de-emphasis. The final drive amplitude and drive de -emphasis are the summation of the base level value and the offset value. The offset value for drive amplitude is 25 mV pd, and 6.25 mV pd for drive de -emphasis. The driver output waveform is the synthesis of amplitude and de -emphasis as shown in Figure 5-1. The driver amplitude without de-emphasis is specified as a peak differential voltage level (mVpd), and the driver de -emphasis modifies the driver amplitude.

PI7C9X2G304SV Page 21 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV - (Amplitude) – De-Emphasis 1 1 1 0 0 0 Input digital wave form Output analog waveform - (Amplitude) + De-Emphasis Amplitude – De-Emphasis Amplitude + De-Emphasis Figure 5-1 Driver Output Waveform

5.1.6 DRIVE AMPLITUDE

Only one of the Drive Amplitude Level field in the Switch Operation Mode Register (offset 74h, bit[20:16], bit[25:21] and bit[30:26]) listed in Table 5-5 is active depending on the d e-emphasis and swing condition. The settings and the corresponding values of the amplitude level are listed in Table 5-6, which can be configured by EEPROM or SMBUS settings. Table 5-5 Drive Amplitude Base Level Registers Active Register De-Emphasis Condition Swing Condition C_DRV_LVL_3P5_NOM -3.5 db Full C_DRV_LVL_6P0_NOM -6.0 db Full C_DRV_LVL_HALF_NOM N/A Half Table 5-6 Drive Amplitude Base Level Settings Setting Amplitude (mV pd) Setting Amplitude (mV pd) Setting Amplitude (mV pd) 00000 0 00111 175 01110 350 00001 25 01000 200 01111 375 00010 50 01001 225 10000 400 00011 75 01010 250 10001 425 00100 100 01011 275 10010 450 00101 125 01100 300 10011 475 00110 150 01101 325 Others Reserved Note: 1. Nominal levels. Actual levels will vary with temperature, voltage and board effects. 2. The maximum nominal amplitude of the output driver is 475 mV pd. Combined values of driver amplitude and de-emphasis greater than 475 mV pd should be avoided. 3. At higher amplitudes, actual swings will be less than the theoretical value due to process variations and environment factors, such as voltage overhead compression, package losses, board losses, and other effects.

5.1.7 DRIVE DE-EMPHASIS

The Drive De-Emphasis Level field in the PHY Parameter 1 Register (Offset 78h, bit[20:16], bit[25:21] and bit[30:26]) listed in Table 5-7 controls the de -emphasis base level. The settings and the corresponding values of the de -emphasis level are listed in Table 5-8, which can be configured globally via EEPROM or SMBUS settings.

PI7C9X2G304SV Page 22 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Table 5-7 Drive De-Emphasis Base Level Register Register De-Emphasis Condition C_EMP_POST_GEN1_3P5_NOM -3.5 db C_EMP_POST_GEN2_3P5_NOM -3.5 db C_EMP_POST_GEN2_6P0_NOM -6.0 db Table 5-8 Drive De-Emphasis Base Level Settings Setting De-Emphasis (mV pd) Setting De-Emphasis (mV pd) Setting De-Emphasis (mV pd) 00000 0.0 01011 69.0 10110 137.5 00001 6.0 01100 75.0 10111 144.0 00010 12.5 01101 81.0 11000 150.0 00011 19.0 01110 87.0 11001 156.0 00100 25.0 01111 94.0 11010 162.5 00101 31.0 10000 100.0 11011 169.0 00110 37.5 10001 106.0 11100 175.0 00111 44.0 10010 112.5 11101 181.0 01000 50.0 10011 119.0 11110 187.5 01001 56.0 10100 125.0 11111 194.0 01010 62.5 10101 131.0 - - Note: 1. Nominal levels. Actual levels will vary with temperature, voltage and board effects. 2. The maximum nominal amplitude of the output driver is 475 mV pd. Combined values of driver amplitude and de-emphasis greater than 475 mV pd should be avoided. 3. At higher amplitudes, actual swings will be less than the theoretical value due to process variations and environment factors, such as voltage overhead compression, package losses, board losses, and other effects.

5.1.8 TRANSMITTER ELECTRICAL IDLE LATENCY

After the last character of the PCI Express transmission, the output current is reduced, and a differential voltage of less t han 20 mV with common mode of VTX -CM-DC is established within 20 UI. This delay time is programmable via Transmitter PHY Latency field in the PHY Parameter 2 Register (Offset 7Ch, bit[3:0]), which can be configured by EEPROM or SMBUS settings.

5.2 DATA LINK LAYER (DLL)

The Data Link Layer (DLL) provides a reliable data transmission between two PCI Express points. An ACK/NACK protocol is employed to guarantee the integrity of the packets delivered. Each Transaction Layer Packet (TLP) is protected by a 32-bit LCRC for error detection. The DLL receiver performs LCRC calculation to determine if the incoming packet is corrupted in the serial link. If an LCRC error is found , the DLL transmitter would issue a NACK data link layer packet (DLLP) to the opposite end to request a re-transmission, otherwise an ACK DLLP would be sent out to acknowledge on reception of a good TLP. In the transmitter, a retry buffer is implemented to store the transmitted TLPs whose corresponding ACK/NACK DLLP have not been received yet. When an ACK is received, the TLPs with sequence number equals to and smaller than that carried in the ACK would be flushed out from the buffer. If a NACK is received or no ACK/NACK is returned from the link partner after the replay timer expires, then a replay mechanism built in DLL transmitter is triggered to re-transmit the corresponding packet that receives NACK or time-out and any other TLP transmitted after that packet. Meanwhile, the DLL is also responsible for the initialization, updating, and monitoring of the flow-control credit. All of the flow control information is carried by DLLP to the other end of the link. Unlike TLP, DLLP is guarded by 16 -bit CRC to detect if data corruption occurs. In addition, the Media Access Control (MAC) block, which is consisted of LTSSM, multiple lanes de -skew, scrambler/de- scrambler, clock correction from inserting skip order-set, and PIPE-related control/status circuits, is implemented to interface physical layer with data link layer.

5.3 TRANSACTION LAYER RECEIVE BLOCK (TLP DECAPSULATION)

The receiving end of the transaction layer performs header information retriev al and TC/VC mapping (see section 5.5), and it validates the correctness of the transaction type and format. If the TLP is found to contain an illegal header or the indicated packet length mismatches with the actual packet length , then a Malformed TLP is reported as an error associated with the receiving port. To ensure end -to-end data integrity, a 32 -bit ECRC is checked against the TLP at the receiver if the digest bit is set in header.

5.4 ROUTING

The transaction layer implements three types of routing protocols: ID-based, address-based, and implicit rout ing. For configuration reads, configuration writes, transaction completion, and user-defined messages, the packets are routed by their destination ID constituted of bus number, device number, and function number . Address routing is employed to forward I/O or memory transaction s to the destination port , which is located within the address range indicated by the address field carried in the packet header. The packet header indicates the packet types including memory read, memory write, IO read, IO write, Message Signaling Interrupt (MSI) and user -defined message. I mplicit routing is mainly used to forward system message transactions such as virtual interrupt line, power management, and so on . The message type embedded in the packet header determines the routing mechanism. If the incoming packet cannot be forwarded to any other port due to a miss to hit the defined address range or targeted ID, this is considered as Unsupported Request (UR) packet, which is similar to a master abort event in PCI protocol.

5.5 TC/VC MAPPING

The 3-bit TC field defined in the header identifies the traffic class of the incoming packets. To enable the differential service, a TC/VC mapping table at destination port that is pre -programmed by system software or EEPROM pre -load is utilized to cast the TC labeled packets into the desired virtual channel. Note that TC0 traffic is mapped into VC0 channel by default. After the TC/VC mapping , the receive block dispatches the incoming request, completion , or data into the appropriate VC0 and VC1 queues.

5.6 QUEUE

In PCI Express, it defines six different packet types to represent request, completion, and data. They are respectively Posted Request Header (PH), Posted Request Data payload (PD), Non -Posted Request Header (NPH), Non -Posted Data Payload (NPD), Completion Header (CPLH) and Completion Data payload (CPLD). Each packet with different type would be put into a separate queue in order to facilitate the following ordering processor. Since NPD usually contains one DW, it can be merged with the corresponding NPH into a common queue named NPHD. Except NPHD, each virtual channel (VC0 or VC1) has its own corresponding packet header and data queue. When only VC0 is needed in some applications, VC1 can be disabled and its resources assigned to VC0 by asserting VC1_EN (Virtual Channel 1 Enable) to low. 5.6.1 PH PH queue provides TLP header spaces for posted memory write s and various message request headers. Each header space occupies sixteen bytes to accommodate 3 DW or 4 DW headers. There are two PH queues for VC0 and VC1 respectively.

PI7C9X2G304SV Page 24 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV 5.6.2 PD PD queue is used for storing posted request data. If the received TLP is of the posted request type and is determined to have payload coming with the header, the payload data would be put into PD queue. There are two PD queues for VC0 and VC1 respectively.

5.6.3 NPHD

NPHD queue provides TLP header spaces for non -posted request packets, which include memory read, IO read, IO write, configuration read, and configuration write. Each header space takes twenty bytes to accommodate a 3-DW header, s 4 -DW header, s 3-WD header with 1-DW data, and a 4-DW header with 1-DW data. There is only one NPHD queue for VC0, since non-posted request cannot be mapped into VC1.

5.6.4 CPLH

CPLH queue provides TLP header space for completion packets. Each header space takes twelve bytes to accommodate a 3- DW header. Please note that there are no 4 -DW completion headers . There are two CPLH queues for VC0 and VC1 respectively.

5.6.5 CPLD

CPLD queue is used for storing completion data. If the received TLP is of the completion type and is determined to have payload coming with the header, the payload data would be put into CPLD queue. There are two CPLD queues for VC0 and VC1 respectively.

5.7 TRANSACTION ORDERING

Within a VPPB, a set of ordering rules is defined to regulate the transactions on the PCI Express Switch including Memory, IO, Configuration and Messages, in order to avoid deadlocks and to support the Producer -Consumer model. The ordering rules defined in table 5 -9 apply within a single Traffic Class (TC). There is no ordering requirement among transactions within different TC labels. Since the transactions with the same TC label are not allowed to map into different virtual channels, it implies no ordering relationship between the traffic in VC0 and VC1. Table 5-9 Summary of PCI Express Ordering Rules Row Pass Column Posted Request Read Request Non-posted Write Request Read Completion Non-posted Write Completion Posted Request Yes/No1 Yes5 Yes5 Yes5 Yes5 Read Request No2 Yes Yes Yes Yes Non-posted Write Request No2 Yes Yes Yes Yes Read Completion Yes/No3 Yes Yes Yes Yes Non-Posted Write Completion Yes4 Yes Yes Yes Yes 1. When the Relaxed Ordering Attribute bit is cleared, the Posted Request transactions including memory write and message request must complete on the egress bus of VPPB in the order in which they are received on the ingress bus of VPPB. If the Relaxed Ordering Attribute bit is set, the Posted Request is permitted to pass over other Posted Requests occurring before it . 2. A Read Request transmitting in the same direction as a previously queued Posted Re quest transaction must push the posted write data ahead of it. The Posted Request transaction must complete on the egress bus before the Read Request can be

PI7C9X2G304SV Page 25 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV attempted on the egress bus. The Read transaction can go to the same location as the Posted data . Therefore, if the Read transaction were to pass the Posted transaction, it would return stale data. 3. When the Relaxed Ordering Attribute bit is cleared, a Read completion must ‘‘pull’’ ahead of previously queued posted data transmitting in the same direction. In this case, the read data transmits in the same direction as the posted data, and the requestor of the read transaction is on the same side of the VPPB as the completer of the posted transaction. The posted transaction must deliver to the completer before the read data is returned to the requestor. If the Relaxed Ordering Attribute bit is set, then a read completion is permitted to pass a previously queued Memory Write or Message Request. 4. Non-Posted Write Com pletions are permitted to pass a previous Memory Write or Message Request transaction. Such transactions are actually transmitting in the opposite directions and hence have no ordering relationship. 5. Posted Request transactions must be given opportunities to pass Non -posted Read and Write Requests as well as Completions. Otherwise, deadlocks may occur when some older b ridges, which do not support delayed transactions are mixed with PCIe Switch in the same system. A fairness algorithm is used to arbitrate between the Posted Write queue and the Non-posted transaction queue

5.8 PORT ARBITRATION

Among multiple ingress ports, the port arbitration built in the egress port determines which incoming packets to be forwarded to the output port. The arbitration algorithm contains hardware fixed Round Robin, 128-phase Weighted Round-Robin and programmable 128-phase time-based WRR. The port arbitration is held within the same VC channel. It means that each port has two port arbitration circuitries for VC0 and VC1 respectively. At the upstream ports, in addition to the inter-port packets, the intra-port packet such as configurations completion would also join the arbitration loop to get the service from Virtual Channel 0.

5.9 VC ARBITRATION

After port arbitration, VC arbitration is executed among different VC channels within the same source. Three arbitration algorithms are provided to choose the appropriate VC: Strict Priority, Round Robin or Weighted Round Robin.

5.10 FLOW CONTROL

PCI Express employs Credit -Based Flow Control mechanism to make buffer utilization more efficient. The transaction layer transmitter ensures that it does not transmit a TLP to an opposite receiver unless the receiver has enough buffer space to accept the TLP. The transaction layer receiver has the responsibility to advertise the free buffer space to an opposite transmitter to avoid packet stale. In this Switch, each port has its own separate queues for different traffic types and the credits are sent to data link layer on the fly . The data link layer compares the current available credits with the monitored ones and reports the updated credit to the counterpart. If no new credit is acquired, the credit reported is scheduled for every 30 us to prevent the link from entering retrain. On the other hand, the receiver at each egress port gets the usable credits from the opposite end in a link. The output port broadcasts them to all the other ingress ports to get packet transmission.

5.11 TRANSATION LAYER TRANSMIT BLOCK (TLP ENCAPSULATION)

The transmit portion of transaction layer performs the following functions. They construct the all types of forwarded TLP generated from VC arbiter, respond with the completion packet s when the local resource (i.e. configuration register) is accessed, and regenerate the message that terminates at receiver to RC if acting as an upstream port.

5.12 ACCESS CONTROLS SERVICE

Traditionally, the packet routing between the peer -to-peer downstream ports is determined by either the address or ID field embedded in the packet header. ACS provides a mechanism for customer to selectively control access between PCI Express Endpoints attached to the downstream ports of packet switch. If ACS is enabled in the ingress port, the peer -to-peer packet forwarding will follow the rule sets of ACS rather than the destination ID or address. ACS is implemented as a set of capabilities and control registers in the associated hardware component. It brings the following benefits such as preventing the silent data corruption presented in Requests from being incorrectly routed to a peer Endpoint, validating every Request transaction between two downstream components and enabling direct routing of peer -to-peer Memory Requests whose addresses have been Translated when ATS system is being used.

6 EEPROM INTERFACE AND SYSTEM MANAGEMENT BUS

The EEPROM interface consists of two pins: EECLK (EEPROM clock output) and EEPD (EEPROM bi -directional serial data). The Switch may control an ISSI IS24C0 4 or compatible parts using into 512x8 bits. The EEPROM is used to initialize a number of registers before enumeration. This is accomplished after PERST_L is de-asserted, at which time the data from the EEPROM is loaded. The EEPROM interface is organized into a 16 -bit base, and the Switch supplies a 7 -bit EEPROM word address. The Switch does not control the EEPROM address input. It can only access the EEPROM with address input set to 0. The System Management Bus interface consists of two pins: SMBCLK (System Management Bus Clock input) and SMBDATA (System Management Bus Data input/ output).

6.1 EEPROM INTERFACE

6.1.1 AUTO MODE EERPOM ACCESS

The Switch may access the EEPROM in a WORD format by utilizing the auto mode through a hardware sequencer. The EEPROM start-control, address, and read/write commands can be accessed through the configuration register. Before each access, the software should check the Autoload Status bit before issuing the next start.

6.1.2 EEPROM MODE AT RESET

During a reset, the Switch will auto matically load the information/data from the EEPROM if the automatic load condition is met. The first offset in the EEPROM contains a signature. If the signature is recognized, the autoload initiate s right after the reset. During the autoload, the Bridge will read sequential words from the EEPROM and write to the appropriate registers. Before the Bridge registers can be accessed through the host, the autoload condition should be verified by reading bit [3] offset DCh (EEPROM Autoload Status). The host access is allowed only after the status of this bit is set to '0' which indicates that the autoload initialization sequence is complete.

6.1.3 EEPROM SPACE ADDRESS MAP

15 – 8 7 – 0 BYTE OFFSET EEPROM Signature (1516h) 00h Vendor ID 02h Device ID 04h Extended VC Count / Link Capability / Switch Mode Operation / Interrupt pin for Port 1 ~ 2 06h Subsystem Vender ID 08h Subsystem ID 0Ah Max_Payload_Size Support / ASPM Support / Role_Base Error Reporting / RefClk ppm Difference 0Ch Global PHY TX Margin Parameter for Port 0~2 0Eh Global PHY Parameter 0 for Port 0~2 10h Global XPIP_CSR6[0] / Global PHY Parameter 1 for Port 0~2 12h Global XPIP_CSR6[4:1] / Global PHY Parameter 2/3 for Port 0~2 14h Global XPIP_CSR4[15:0] for Port 0~2 16h Global XPIP_CSR4[31:16] for Port 0~2 18h Global XPIP_CSR5[15:0] for Port 0~2 1Ah Buffer_ctrl[4:0] / Globe XPIP_CSR6[7:5] for Port 0~2 Global XPIP_CSR5[23:16] for Port 0~2 1Ch MAC_CTR / Global PHY Parameter 3 for Port 0~2 1Eh NFTS / Deskew Mode Select / Scramble / XPIP_CSR2 for Port 0 20h NFTS / Deskew Mode Select / Scramble / XPIP_CSR2 for Port 1 22h

PI7C9X2G304SV Page 28 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV 15 – 8 7 – 0 BYTE OFFSET NFTS / Deskew Mode Select / Scramble / XPIP_XSR2 for Port 2 24h Reserved 26h LTSSM CSR / PML1 Option for Port 0 28h LTSSM CSR / PML1 Option for Port 1 2Ah LTSSM CSR / PML1 Option for Port 2 2Ch Reserved 2Eh PHY Parameter2_0 for Port 0 30h PHY Parameter2_0 for Port 1 32h PHY Parameter2_0 for Port 2 34h Reserved 36h XPIP_CSR3[15:0] for Port 0 38h XPIP_CSR3[15:0] for Port 1 3Ah XPIP_CSR3[15:0] for Port 2 3Ch Reserved 3Eh Do_change_rate_cnt/ XPIP_CSR_2 for Port 0 PHY Parameter 3 / PHY Parameter2_1 for Port 0 40h Sel_deemp/ Do_change_rate_cnt/ XPIP_CSR_2 for Port 1 PHY Parameter 3 / PHY Parameter2_1 for Port 1 42h Sel_deemp/ Do_change_rate_cnt/ XPIP_CSR_2 for Port 2 PHY Parameter 3 / PHY Parameter2_1 for Port 2 44h Reserved 46h XPIP_CSR3[16:31] for Port 0 48h XPIP_CSR3[16:31] for Port 1 4Ah XPIP_CSR3[16:31] for Port 2 4Ch Reserved 4Eh PM Data for Port 0 PM Capability for Port 0 50h PM Data for Port 1 PM Capability for Port 1 52h PM Data for Port 2 PM Capability for Port 2 54h Reserved 56h MAC CSR for Port 0 58h MAC CSR for Port 1 5Ah MAC CSR for Port 2 5Ch Reserved 5Eh TC/VC Map for Port 0 (VC0) Slot Clock / LPVC Count / Port Num for Port 0 60h TC/VC Map for Port 1 (VC0) Slot Implemented / Slot Clock / LPVC Count / Port Num for Port 1 62h TC/VC Map for Port 2 (VC0) Slot Implemented / Slot Clock / LPVC Count / Port Num for Port 2 64h Reserved 66h TL_CSR0/Clock PM Cap/L1PM Substrates Cap/TL_CSR1 for Port 0 68h TL_CSR0/Clock PM Cap/L1PM Substrates Cap/TL_CSR1 for Port 1 6Ah TL_CSR0/Clock PM Cap/L1PM Substrates Cap/TL_CSR1 for Port 2 6Ch Reserved 6Eh Power Budgeting Capability Register for Port 0 70h Power Budgeting Capability Register for Port 1 72h Power Budgeting Capability Register for Port 2 74h Reserved 76h REV_TS_CTR/Replay Time-out Counter for Port 0 78h REV_TS_CTR /Replay Time-out Counter for Port 1 7Ah REV_TS_CTR /Replay Time-out Counter for Port 2 7Ch Reserved 7Eh XPIP_CSR5[30:24] for Port 0 PM Control Para/Rx Polarity for Port 0 80h XPIP_CSR5[30:24] for Port 1 PM Control Para/Rx Polarity for Port 1 82h XPIP_CSR5[30:24] for Port 2 PM Control Para/Rx Polarity for Port 2 84h Reserved 86h Acknowledge Latency Timer for Port 0 88h Acknowledge Latency Timer for Port 1 8Ah Acknowledge Latency Timer for Port 2 8Ch Reserved 8Eh Reserved 90h Slot Capability 0 for Port 1 92h Slot Capability 0 for Port 2 94h Reserved 96h Reserved 98h Slot Capability 1 for Port 1 9Ah

PI7C9X2G304SV Page 29 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV 15 – 8 7 – 0 BYTE OFFSET Slot Capability 1 for Port 2 9Ch Reserved 9Eh VC1 MAX Time Slot / TC/VC Map for Port 0 A0h VC1 MAX Time Slot / TC/VC Map for Port 1 A2h VC1 MAX Time Slot / TC/VC Map for Port 2 A4h Reserved A6h Reserved A8h - FEh

6.1.4 MAPPING EEPROM CONTENTS TO CONFIGURATION REGISTERS

ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 00h EEPROM signature 1516h 02h 00h ~ 01h Vendor ID 12D8h 04h 02h ~ 03h Device ID B304h 06h 144h (Port 0~2) 144h: Bit [0] CCh (Port 0~2) CCh: Bit [14:12] CCh: Bit [17:15] 74h (Port 0~2) 74h: Bit [7] 74h: Bit [5] 74h: Bit [6] 74h: Bit [0] 74h: Bit [2:1] 74h: Bit [3] 74h: Bit [4] 3Ch (Port 1~2) 3Ch: Bit [8] Extended VC Count for Port 0~2 ▪ Bit [0]: It represents the supported VC count other than the default VC Link Capability for Port 0~2 ▪ Bit [3:1]: It represents L0s Exit Latency for all ports ▪ Bit [6:4]: It represents L1 Exit Latency for all ports Switch Mode Operation for Port 0 ▪ Bit [7]: Non-Post TLP Sotre-Forward ▪ Bit [8]: no ordering on packets for different egress port mode ▪ Bit [9]: no ordering on different tag of completion mode ▪ Bit [10]: Store and Forward ▪ Bit [12:11]: Cut-through Threshold ▪ Bit [13] : Port arbitrator Mode ▪ Bit [14]: Credit Update Mode Interrupt pin for Port 1~2 ▪ Bit [15]: Set when INTA is requested for interrupt resource 0806h bit[0]: HWInit 08h B4h ~ B5h Subsystem Vender ID 0000h 0Ah B6h ~ B7h Subsystem ID 0000h 0Ch C4h (Port 0~2) C4h: Bit [1:0] CCh (Port 0~2) CCh: Bit [11:10] C4h (Port 0~2) C4h: Bit [15] 70h (Port 0~2) 70h: Bit [14] 74h (Port 0~2) 74h: Bit [15] 70h (Port 0~2) 70h: Bit [13] 8Ch (Port 0~2) 8Ch: Bit [5] CCh (Port 1~3) CCh: Bit [21] Max_Payload_Size Support for Port 0~2 ▪ Bit [1:0]: Indicated the maximum payload size that the device can support for the TLP ASPM Support for Port 0~2 ▪ Bit [3:2]: Indicate the level of ASPM supported on the PCIe link Role_Base Error Reporting for Port 0~2 ▪ Bit [4]: Indicate implement the role-base error reporting MSI Capability Disable for Port 0~2 ▪ Bit [5]: Disable MSI capability Compliance Pattern Parity Control Disable for Port 0~2 ▪ Bit [6]: Disable compliance pattern parity Power Management Capability Disable for Port 0~2 ▪ Bit [7]: Disable Power Management Capability ORDER RULE5 Enable for Port 0~2 ▪ Bit [8]: Capability for Post packet Pass Non-Post packet Link Bandwidth Notification Capability for port 1~ 3 ▪ Bit [9]: Link Bandwidth Notification Capability 001Dh bit[1:0]: HWInit

PI7C9X2G304SV Page 30 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 8Ch (Port 0~2) 8Ch: Bit [6] 8Ch (Port 0~2) 8Ch: Bit [0] CCh (Port 0~2) CCh: Bit [19] 8Ch (Port 0~2) 8Ch: Bit [1] E4h (Port 0~2) E4h: Bit [12] 8Ch (Port 0~2) 8Ch: Bit [3] Ordering Frozen for Port 0~2 ▪ Bit [10]: Freeze the ordering feature TX SOF Latency Mode for Port 0~2 ▪ Bit [11]: Set to zero to shorten latency Surprise Down Capability Enable for Port 0~2 ▪ Bit [12]: Enable Surprise Down Capability Power Management’s Data Select Register R/W Capability for Port 0~2 ▪ Bit [13]: Enable Data Select Register R/W LTR Capability Enable for Port 0~2 ▪ Bit [14]: LTR capability enable 4KB Boundary Check Enable for Port 0~2 ▪ Bit [15]: Enable 4KB Boundary Check 0Eh 94h (Port 0~2) 94h: Bit [4:0] 94h: Bit [9:5] 94h: Bit [14:10] E4h (Port 0~2) E4h: Bit [18] PHY TX Margin Parameter for Port 0~2 ▪ Bit [4:0]: C_DRV_LVL_3P5_MGN2 ▪ Bit [9:5]: C_DRV_LVL_6P0_MGN2 ▪ Bit [14:10]: C_DRV_LVL_HALF_MGN2 OBFF Capability Enable for Port 0~2 ▪ Bit [15]: enable OBFF capability 916Bh 10h 74h (Port 0~2) 74h: Bit [20:16] 74h: Bit [25:21] 74h: Bit [30:26] 8Ch (Port 0~2) 8Ch: Bit [31] PHY Parameter 0 for Port 0~2 ▪ Bit [4:0]: C_DRV_LVL_3P5_NOM ▪ Bit [9:5]: C_DRV_LVL_6P0_NOM ▪ Bit [14:10]: C_DRV_LVL_HALF_NOM TL_CSR0[31] for Port 0~2 ▪ Bit [15]: P35_GEN2_MODE 0A73h 12h 78h (Port 0~2) 78h: Bit [20:16] 78h: Bit [25:21] 78h: Bit [30:26] 8Ch (Port 0~2) 8Ch: Bit [16] PHY Parameter 1 for Port 0~2 ▪ Bit [4:0]: C_EMP_POST_GEN1_3P5_NOM ▪ Bit [9:5]: C_EMP_POST_GEN2_3P5_NOM ▪ Bit [14:10]: C_EMP_POST_GEN2_6P0_NOM XPIP_CSR6[0] for Port 0~2 ▪ Bit [15]: XPIP_CSR6[0] F6B5h 14h 7Ch (Port 0~2) 7Ch: Bit [3:0] 7Ch: Bit [6:4] 90h (Port 0~2) 90h: Bit [19:15] 8Ch (Port (0~3) 8Ch: Bit [20:17] PHY Parameter 2 for Port 0~2 ▪ Bit [3:0]: C_TX_PHY_LATENCY ▪ Bit [6:4]: C_REC_DETECT_USEC PHY Parameter 3 for Port 0~2 ▪ Bit [11:7]: C_EMP_POST_HALF_DELTA XPIP_CSR6[4:1] for Port 0~2 ▪ Bit [15:12]: XPIP_CSR6[4:1] C0A7h 16h 84h (Port 0~2) 84h: Bit [15:0] XPIP_CSR4[15:0] for Port 0~2 ▪ Bit [15:0]: XPIP_CSR4[15:0] 0000h 18h 84h (Port 0~2) 84h: Bit [31:16] XPIP_CSR4[31:16] for Port 0~2 ▪ Bit [15:0]: XPIP_CSR4[31:16] 0000h 1A 88h (Port 0~2) 88h: Bit [15:0] XPIP_CSR5[15:0] for Port 0~2 Bit [15:0]: XPIP_CSR5[15:0] 3333h 1C 88h (Port 0~2) 88h: Bit [23:16] 8Ch (Port 0~2) 8Ch: Bit [23:21] 98h (Port 0~2) 98h: Bit [20:16] XPIP_CSR5[28:16] for Port 0~2 ▪ Bit [7:0]: XPIP_CSR5[23:16] XPIP_CSR6[7:5] for Port 0~2 ▪ Bit [10:8]: XPIP_CSR6[7:5] BUFFER_CTRL[4:0] for Port 0~2 ▪ Bit [15:11]: Reference clock Buffer control 7B08h 1E 90h (Port 0~2) 90h: Bit [21:20] 90h: Bit [23:22] 90h: Bit [25:24] PHY parameter 3 for Port 0~2 ▪ Bit [1:0]: C_DRV_LVL_3P5_DELTA ▪ Bit [3:2]: C_DRV_LVL_6P0_DELTA ▪ Bit [5:4]: C_DRV_LVL_HALF_DELTA 0000h

PI7C9X2G304SV Page 31 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 90h: Bit [27:26] 90h: Bit [29:28] 90h: Bit [31:30] 8Ch (Port 0~2) 8Ch: Bit [29:26] ▪ Bit [7:6]: C_EMP_POST_GEN1_3P5_DELTA ▪ Bit [9:8]: C_EMP_POST_GEN2_3P5_DELTA ▪ Bit [11:10]: C_EMP_POST_GEN2_6P0_DELTA MAC control parameter for Port 0~2 ▪ Bit [15:12]: MAC_CTR 20h 78h (Port 0) 78h: Bit [7 :0] 68h (Port 0) 68h: Bit [14:13] 78h (Port 0) 78h: Bit [9:8] 78h: Bit [10] 78h (Port 0) 78h: Bit [13:12] 78h (Port 0) 78h: Bit [14] FTS Number for Port 0 ▪ Bit [7:0]: FTS number at receiver side Deskew Mode Select for Port 0 ▪ Bit [9:8]: deskew mode select Scrambler Control for Port 0 ▪ Bit [11:10]: scrambler control ▪ Bit [12]: L0s Change_Speed_Sel for Port 0 ▪ Bit [14:13]: Change Speed select Change_Speed_En for Port 0 ▪ Bit [15]: Change Speed enable 0080h 22h 78h (Port 1) 78h: Bit [7 :0] 68h (Port 1) 68h: Bit [14:13] 78h (Port 1) 78h: Bit [9:8] 78h: Bit [10] 78h (Port 1) 78h: Bit [13:12] 78h (Port 1) 78h: Bit [14] FTS Number for Port 1 ▪ Bit [7:0]: FTS number at receiver side Deskew Mode Select for Port 1 ▪ Bit [9:8]: deskew mode select Scrambler Control for Port 1 ▪ Bit [11:10]: scrambler control ▪ Bit [12]: L0s Change_Speed_Sel for Port 1 ▪ Bit[ 14:13]: Change Speed select Change_Speed_En for Port 1 ▪ Bit [15]: Change Speed enable 0080h 24h 78h (Port 2) 78h: Bit [7 :0] 68h (Port 2) 68h: Bit [14:13] 78h (Port 2) 78h: Bit [9:8] 78h: Bit [10] 78h (Port 2) 78h: Bit [13:12] 78h (Port 2) 78h: Bit [14] FTS Number for Port 2 ▪ Bit [7:0]: FTS number at receiver side Deskew Mode Select for Port 2 ▪ Bit [9:8]: deskew mode select Scrambler Control for Port 2 ▪ Bit [11:10]: scrambler control ▪ Bit [12]: L0s Change_Speed_Sel for Port 2 ▪ Bit [14:13]: Change Speed select Change_Speed_En for Port 2 ▪ Bit [15]: Change Speed enable 0080h 28h 33Ch (Port 0) 33Ch: Bit [7 :0] 98h (Port 0) 98h: Bit [24] 98h: Bit [25] 98h: Bit [27:26] LTSSM CSR for Port 0 ▪ Bit [7:0]: LTSSM CSR PML1 Option for Port 0 ▪ Bit [12]: pml1 option all ▪ Bit [13]: pml1 disable ▪ Bit [15:14]: clock request control 0004h 2Ah 33Ch (Port 1) 33Ch: Bit [7 :0] 98h (Port 1) 98h: Bit [24] 98h: Bit [25] 98h: Bit [27:26] LTSSM CSR for Port 1 ▪ Bit [7:0]: LTSSM CSR PML1 Option for Port 1 ▪ Bit [12]: pml1 option all ▪ Bit [13]: pml1 disable ▪ Bit [15:14]: clock request control 0004h 2Ch 33Ch (Port 2) 33Ch: Bit [7 :0] LTSSM CSR for Port 2 ▪ Bit [7:0]: LTSSM CSR 0004h

PI7C9X2G304SV Page 32 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 98h (Port 2) 98h: Bit [24] 98h: Bit [25] 98h: Bit [27:26] PML1 Option for Port 2 ▪ Bit [12]: pml1 option all ▪ Bit [13]: pml1 disable ▪ Bit [15:14]: clock request control 30h 7Ch (Port 0) 7Ch: Bit [30 :16] PHY Parameter2_1 for Port 0 ▪ Bit [14:0]: PHY parameter 2 0010h 32h 7Ch (Port 1) 7Ch: Bit [30 :16] PHY Parameter2_1 for Port 1 ▪ Bit [14:0]: PHY parameter 2 0010h 34h 7Ch (Port 2) 7Ch: Bit [30 :16] PHY Parameter2_1 for Port 2 ▪ Bit [14:0]: PHY parameter 2 0010h 38h 80h (Port 0) 80h: Bit [15 :0] XPIP_CSR3_0 for Port 0 ▪ Bit [15:0]: XPIP_CSR3[15:0] 0000h 3Ah 80h (Port 1) 80h: Bit [15 :0] XPIP_CSR3_0 for Port 1 ▪ Bit [15:0]: XPIP_CSR3[15:0] 0000h 3Ch 80h (Port 2) 80h: Bit [15 :0] XPIP_CSR3_0 for Port 2 ▪ Bit [15:0]: XPIP_CSR3[15:0] 0000h 40h 7Ch (Port 0) 7Ch: Bit [12 :8] 90h (Port 0) 90h: Bit [6 :0] F0h (Port 0) F0h: Bit [6] 78h (Port 0) 78h: Bit [11] 8Ch (Port 0) 8Ch: Bit [9:8] PHY Parameter 2_0 for Port 0 ▪ Bit [4:0]: PHY parameter 2 PHY Parameter 3 for Port 0 ▪ Bit [11:5]: PHY parameter 3 Selectable De-emphasis for Port 0 ▪ Bit [12]: Selectable De-emphasis Compliance to Detect for Port 0 ▪ Bit [13]: compliance to detect DO_CHG_DATA_CNT_SEL for Port 0 ▪ Bit [15:14]: DO_CHG_DATA_CNT_SEL 001Dh 42h 7Ch (Port 1) 7Ch: Bit [12 :8] 90h (Port 1) 90h: Bit [6 :0] F0h (Port 1) F0h: Bit [6] 78h (Port 1) 78h: Bit [11] 8Ch (Port 1) 8Ch: Bit [9:8] PHY Parameter 2_0 for Port 1 ▪ Bit [4:0]: PHY parameter 2 PHY Parameter 3 for Port 1 ▪ Bit [11:5]: PHY parameter 3 Selectable De-emphasis for Port 1 ▪ Bit [12]: Selectable De-emphasis Compliance to Detect for Port 1 ▪ Bit [13]: compliance to detect DO_CHG_DATA_CNT_SEL for Port 1 ▪ Bit [15:14]: DO_CHG_DATA_CNT_SEL 101Dh 44h 7Ch (Port 2) 7Ch: Bit [12 :8] 90h (Port 2) 90h: Bit [6 :0] F0h (Port 2) F0h: Bit [6] 78h (Port 2) 78h: Bit [11] 8Ch (Port 2) 8Ch: Bit [9:8] PHY Parameter 2_0 for Port 2 ▪ Bit [4:0]: PHY parameter 2 PHY Parameter 3 for Port 2 ▪ Bit [11:5]: PHY parameter 3 Selectable De-emphasis for Port 2 ▪ Bit [12]: Selectable De-emphasis Compliance to Detect for Port 2 ▪ Bit [13]: compliance to detect DO_CHG_DATA_CNT_SEL for Port 2 ▪ Bit [15:14]: DO_CHG_DATA_CNT_SEL 101Dh 48h 80h (Port 0) 80h: Bit [31 :16] XPIP_CSR3_1 for Port 0 ▪ Bit [15:0]: XPIP_CSR3[31:16] 000Fh 4Ah 80h (Port 1) 80h: Bit [31 :16] XPIP_CSR3_1 for Port 1 ▪ Bit [15:0]: XPIP_CSR3[31:16] 000Fh 4Ch 80h (Port 2) 80h: Bit [31 :16] XPIP_CSR3_1 for Port 2 ▪ Bit [15:0]: XPIP_CSR3[31:16] 000Fh 50h 44h (Port 0) 44h: Bit [3] No_Soft_Reset for Port 0 ▪ Bit [0]: No_Soft_Reset. FFh

PI7C9X2G304SV Page 33 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 40h (Port 0) 40h: Bit [24:22] 40h: Bit [25] 40h: Bit [26] 40h: Bit [29:28] Power Management Capability for Port 0 ▪ Bit [3:1]: AUX Current. ▪ Bit [4]: read only as 1 to indicate Bridge supports the D1 power management state ▪ Bit [5]: read only as 1 to indicate Bridge supports the D2 power management state ▪ Bit [7:6]: PME Support for D2 and D1 states 44h (Port 0) 44h: Bit [31:24] Power Management Data for Port 0 ▪ Bit [15:8]: read only as Data register 00h 52h 44h (Port 1) 44h: Bit [3] 40h (Port 1) 40h: Bit [24:22] 40h: Bit [25] 40h: Bit [26] 40h: Bit [29:28] No_Soft_Reset for Port 1 ▪ Bit [0]: No_Soft_Reset. Power Management Capability for Port 1 ▪ Bit [3:1]: AUX Current. ▪ Bit [4]: read only as 1 to indicate Bridge supports the D1 power management state ▪ Bit [5]: read only as 1 to indicate Bridge supports the D2 power management state ▪ Bit [7:6]: PME Support for D2 and D1 states FFh 44h (Port 1) 44h: Bit [31:24] Power Management Data for Port 1 ▪ Bit [15:8]: read only as Data register 00h 54h 44h (Port 2) 44h: Bit [3] 40h (Port 2) 40h: Bit [24:22] 40h: Bit [25] 40h: Bit [26] 40h: Bit [29:28] No_Soft_Reset for Port 2 ▪ Bit [0]: No_Soft_Reset Power Management Capability for Port 2 ▪ Bit [3:1]: AUX Current ▪ Bit [4]: read only as 1 to indicate Bridge supports the D1 power management state ▪ Bit [5]: read only as 1 to indicate Bridge supports the D2 power management state ▪ Bit [7:6]: PME Support for D2 and D1 states FFh 44h (Port 2) 44h: Bit [31:24] Power Management Data for Port 2 ▪ Bit [15:8]: read only as Data register 00h 58h 340h (Port 0) 340h: Bit [15 :0] MAC_CSR for Port 0 ▪ Bit [15:0]: MAC CSR 0004h 5Ah 340h (Port 1) 340h: Bit [15 :0] MAC_CSR for Port 1 ▪ Bit [15:0]: MAC CSR 0004h 5Ch 340h (Port 2) 340h: Bit [15 :0] MAC_CSR for Port 2 ▪ Bit [15:0]: MAC CSR 0004h 60h D0h (Port 0) D0h: Bit [28] 40h (Port 0) 40h: Bit[21] 144h (Port 0) 144h: Bit [4] CCh (Port 0) CCh: Bit [26:24] Slot Clock Configuration for Port 0 ▪ Bit [1]: When set, the component uses the clock provided on the connector Device specific Initialization for Port 0 ▪ Bit [2]: When set, the DSI is required LPVC Count for Port 0 ▪ Bit [3]: When set, the VC1 is allocated to LPVC of Egress Port 0 Port Number for Port 0 ▪ Bit [6:4]: It represents the logic port numbering for physical port 0 02h bit[1]: HWInit 154h (Port 0) 154h: Bit [7:1] VC0 TC/VC Map for Port 0 ▪ Bit [15:9]: When set, it indicates the corresponding TC is mapped into VC0 FEh

PI7C9X2G304SV Page 34 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 62h C0h (Port 1) C0h: Bit [24] D0h (Port 1) D0h: Bit [28] 40h (Port 1) 40h: Bit [21] 144h (Port 1) 144h: Bit [4] CCh (Port 1) CCh: Bit [26:24] PCIe Capability Slot Implemented for Port 1 ▪ Bit [0]: When set, the slot is implemented for Port 1 Slot Clock Configuration for Port 1 ▪ Bit [1]: When set, the component uses the clock provided on the connector Device specific Initialization for Port 1 ▪ Bit [2]: When set, the DSI is required LPVC Count for Port 1 ▪ Bit [3]: When set, the VC1 is allocated to LPVC of Egress Port 1 Port Number for Port 1 ▪ Bit [6:4]: It represents the logic port numbering for physical port 1 12h bit[0]: HWInit bit[1]: HWInit 154h (Port 1) 154h: Bit [7:1] VC0 TC/VC Map for Port 1 ▪ Bit [15:9]: When set, it indicates the corresponding TC is mapped into VC0 FEh 64h C0h (Port 2) C0h: Bit [24] D0h (Port 2) D0h: Bit [28] 40h (Port 2) 40h: Bit [21] 144h (Port 2) 144h: Bit [4] CCh (Port 2) CCh: Bit [26:24] PCIe Capability Slot Implemented for Port 2 ▪ Bit [0]: When set, the slot is implemented for Port 2 Slot Clock Configuration for Port 2 ▪ Bit [1]: When set, the component uses the clock provided on the connector Device specific Initialization for Port 2 ▪ Bit [2]: When set, the DSI is required LPVC Count for Port 2 ▪ Bit [3]: When set, the VC1 is allocated to LPVC of Egress Port 2 Port Number for Port 2 ▪ Bit [6:4]: It represents the logic port numbering for physical port 2 22h bit[0]: HWInit bit[1]: HWInit 154h (Port 2) 154h: Bit [7:1] VC0 TC/VC Map for Port 2 ▪ Bit [15:9]: When set, it indicates the corresponding TC is mapped into VC0 FEh 68h 8Ch (Port 0) 8Ch: Bit[10] 8Ch: Bit[11] CCh (Port 0) CCh: Bit [18] 244h (Port 0) 244h: Bit [1] 244h: Bit[3] 244h: Bit[4] 344h (Port 0) 344h: Bit [0] 344h: Bit [1] TL_CSR0 Register for Port 0 ▪ Bit [0]: Port Disable ▪ Bit [1]: Reset_p_sel Clock PM Cap for Port 0 ▪ Bit [2]: clock pm cap. L1PM Substrates Capability Register for Port 0 ▪ Bit [4]: pci_pm_l11_sup ▪ Bit [5]: aspm_pm_l11_sup ▪ Bit [6]: l1pm_subs_sup TL_CSR1 Register for Port 0 ▪ Bit [8]: ARB_VC_MODE ▪ Bit [9]: GNT_FAIL_MODE 0376h 6Ah 8Ch (Port 1) 8Ch: Bit[10] 8Ch: Bit[11] CCh (Port 1) CCh: Bit [18] 244h (Port 1) 244h: Bit [1] 244h: Bit[3] 244h: Bit[4] 344h (Port 1) TL_CSR0 Register for Port 1 ▪ Bit [0]: Port Disable ▪ Bit [1]: Reset_p_sel Clock PM Cap for Port 1 ▪ Bit [2]: clock pm cap. L1PM Substrates Capability Register for Port 1 ▪ Bit [4]: pci_pm_l11_sup ▪ Bit [5]: aspm_pm_l11_sup ▪ Bit [6]: l1pm_subs_sup TL_CSR1 Register for Port 1 0370h

PI7C9X2G304SV Page 35 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 344h: Bit [0] 344h: Bit [1] ▪ Bit [8]: ARB_VC_MODE ▪ Bit [9]: GNT_FAIL_MODE 6Ch 8Ch (Port 2) 8Ch: Bit[10] 8Ch: Bit[11] CCh (Port 2) CCh: Bit [18] 244h (Port 2) 244h: Bit [1] 244h: Bit[3] 244h: Bit[4] 344h (Port 2) 344h: Bit [0] 344h: Bit [1] TL_CSR0 Register for Port 2 ▪ Bit [0]: Port Disable ▪ Bit [1]: Reset_p_sel Clock PM Cap for Port 2 ▪ Bit [2]: clock pm cap. L1PM Substrates Capability Register for Port 2 ▪ Bit [4]: pci_pm_l11_sup ▪ Bit [5]: aspm_pm_l11_sup ▪ Bit [6]: l1pm_subs_sup TL_CSR1 Register for Port 2 ▪ Bit [8]: ARB_VC_MODE ▪ Bit [9]: GNT_FAIL_MODE 0370h 70h 214h (Port 0) 214h: Bit [7:0] 214h: Bit [9:8] 214h: Bit [14:13] 218h: Bit [0] Power Budget Register for Port 0 ▪ Bit [7:0]: Base Power ▪ Bit [9:8]: Data Scale ▪ Bit [11:10]: PM State ▪ Bit [15]: System Allocated 0004h 72h 214h (Port 1) 214h: Bit [7:0] 214h: Bit [9:8] 214h: Bit [14:13] 218h: Bit [0] Power Budget Register for Port 1 ▪ Bit [7:0]: Base Power ▪ Bit [9:8]: Data Scale ▪ Bit [11:10]: PM State ▪ Bit [15]: System Allocated 0004h 74h 214h (Port 2) 214h: Bit [7:0] 214h: Bit [9:8] 214h: Bit [14:13] 218h: Bit [0] Power Budget Register for Port 2 ▪ Bit [7:0]: Base Power ▪ Bit [9:8]: Data Scale ▪ Bit [11:10]: PM State ▪ Bit [15]: System Allocated 0004h 78h 70h (Port 0) 70h: Bit [12:0] 8Ch (Port 0) 8Ch: Bit [25:24] Replay Time-out Counter for Port 0 ▪ Bit [12:0]: Relay Time-out Counter REV_TS_CTR for Port 0 ▪ Bit [14:13]: REV_TS_CTR 0000h 7Ah 70h (Port 1) 70h: Bit [12:0] 8Ch (Port 1) 8Ch: Bit [25:24] Replay Time-out Counter for Port 1 ▪ Bit [12:0]: Relay Time-out Counter REV_TS_CTR for Port 1 ▪ Bit [14:13]: REV_TS_CTR 0000h 7Ch 70h (Port 2) 70h: Bit [12:0] 8Ch (Port 2) 8Ch: Bit [25:24] Replay Time-out Counter for Port 2 ▪ Bit [12:0]: Relay Time-out Counter REV_TS_CTR for Port 2 ▪ Bit [14:13]: REV_TS_CTR 0000h 80h 74h (Port 0) 74h: Bit [13:8] 74h: Bit [14] 70h (Port 0) 70h: Bit [31] 88h (Port 0) 88h: Bit [31:24] PM Control Parameter for Port 0 ▪ Bit [1:0]: D3 enters L1 ▪ Bit [3:2]: L1 delay count select ▪ Bit [5:4]: L0s enable ▪ Bit [6]: Disable Rx polarity capability VGA Decode Enable for Port 0 ▪ Bit [7]: Enable VGA decode XPIP_CSR5[31:24] for Port 0 Bit [15:8]: XPIP_CSR5[31:24] 73A1h

PI7C9X2G304SV Page 36 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV ADDRESS PCI CFG OFFSET DESCRIPTION Default Value 82h 74h (Port 1) 74h: Bit [13:8] 74h: Bit [14] 70h (Port 1) 70h: Bit [31] 88h (Port 1) 88h: Bit [31:24] PM Control Parameter for Port 1 ▪ Bit [1:0]: D3 enters L1 ▪ Bit [3:2]: L1 delay count select ▪ Bit [5:4]: L0s enable ▪ Bit [6]: Disable Rx polarity capability VGA Decode Enable for Port 1 ▪ Bit [7]: Enable VGA decode XPIP_CSR5[31:24] for Port 1 ▪ Bit [15:8]: XPIP_CSR5[31:24] 33A1h 84h 74h (Port 2) 74h: Bit [13:8] 74h: Bit [14] 70h (Port 2) 70h: Bit [31] 88h (Port 2) 88h: Bit [31:24] PM Control Parameter for Port 2 ▪ Bit [1:0]: D3 enters L1 ▪ Bit [3:2]: L1 delay count select ▪ Bit [5:4]: L0s enable ▪ Bit [6]: Disable Rx polarity capability VGA Decode Enable for Port 2 ▪ Bit [7]: Enable VGA decode XPIP_CSR5[31:24] for Port 2 ▪ Bit [15:8]: XPIP_CSR5[31:24] 33A1h 88h 70h (Port 0) 70h: Bit [30:16] Acknowledge Latency Timer for Port 0 ▪ Bit [14:0]: Acknowledge Latency Timer 0000h 8Ah 70h (Port 1) 70h: Bit [30:16] Acknowledge Latency Timer for Port 1 ▪ Bit [14:0]: Acknowledge Latency Timer 0000h 8Ch 70h (Port 2) 70h: Bit [30:16] Acknowledge Latency Timer for Port 2 ▪ Bit [14:0]: Acknowledge Latency Timer 0000h 92h D4h (Port 1) D4h: Bit [15:0] Slot Capability 0 of Port 1 ▪ Bit [15:0]: Mapping to the low word of slot capability register 0000h 94h D4h (Port 2) D4h: Bit [15:0] Slot Capability 0 of Port 2 ▪ Bit [15:0]: Mapping to the low word of slot capability register 0000h 9Ah D4h (Port 1) D4h: Bit [31:16] Slot Capability 1 of Port 1 ▪ Bit [15:0]: Mapping to the high word of slot capability register 0008h 9Ch D4h (Port 2) D4h: Bit [31:16] Slot Capability 1 of Port 2 ▪ Bit [15:0]: Mapping to the high word of slot capability register 0010h A0h 15Ch (Port 0) 15Ch: Bit [22:16] 160h (Port 0) 160h: Bit [7:0] VC1 MAX Time Slot for Port 0 ▪ Bit [6:0]: The maximum time slot supported by VC1 TC/VC Map for Port 0 ▪ Bit [15:8]: When set, it indicates the corresponding TC is mapped into VC1 0000h A2h 15Ch (Port 1) 15Ch: Bit [22:16] 160h (Port 1) 160h: Bit [7:0] VC1 MAX Time Slot for Port 1 ▪ Bit [6:0]: The maximum time slot supported by VC1 TC/VC Map for Port 1 ▪ Bit [15:8]: When set, it indicates the corresponding TC is mapped into VC1 0000h A4h 15Ch (Port 2) 15Ch: Bit [22:16] 160h (Port 2) 160h: Bit [7:0] VC1 MAX Time Slot for Port 2 ▪ Bit [6:0]: The maximum time slot supported by VC1 TC/VC Map for Port 2 ▪ Bit [15:8]: When set, it indicates the corresponding TC is mapped into VC1 0000h

6.2 SMBus INTERFACE

The PI7C9X2G304SV provides the System Management Bus (SMBus), a two -wire interface through which a simple device can communicate with the rest of the system. The SMBus interface on the PI7C9X2G304SV is a bi -directional slave interface. It can receive data from the SMBus master or send data to the master. The interface allows full access to the configuration registers. A SMBus master, such as the processor or other SMBus devices, can read or write to every RW configuration register (read/write register). In addition, the RO and HwInt registers (read -only and hardware initialized registers) that can be auto -loaded by the EEPROM interface can also be read and written by the SMBus interface. This feature allows increases in the system expandability and flexibility in system implementation. Pericom PCIe Packet Switch SMBCLK SMBDATA Processor (SMBus Master) Other SMBus Devices Figure 6-1 SMBus Architecture Implementation on PI7C9X2G304SV The SMBus interface on the PI7C9X2G304SV consists of one SMBus clock pin (SMBCLK), a SMBus data pin (SMBDATA), and 3 SMBus address pins (GPIO[5:7]). The SMBus clock pin provides or receives the clock signal. The SMBus data pin facilitates the data transmission and reception. Both of the clock and data pins are bi -directional. The SMBus address pins determine the address to which the PI7C9X2G304SV responds to. The SMBus address pins generate addresses according to the following table: Table 6-1 SMBus Address Pin Configuration BIT SMBus Address

0 GPIO[5]

1 GPIO[6]

2 GPIO[7]

6.2.1 SMBUS WRITE

The Write command is us ed to write the PI7C9X 2G304SV registers. General SMBus Writes are illustrated in Figure 6-2. Table 6-2 explains the elements used in Figure 6-2.

PI7C9X2G304SV Page 38 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Figure 6-2 SMBus Write Command Format, to Write to a PI7C9X2G304SV Register (PEC disable) : Master to Slave : Slave to Master Table 6-2 Bytes for SMBus Write Field (Byte) On Bus Bit(s) Value/ Description S 1 START condition P 1 STOP condition A 1 Acknowledge (this bit position may be 0 for an ACK or 1 for a NACK) Cmd Code 7:0 08h Offset 7:0 PI7C9X2G304SV Register Address [7:0] Port 7:0 Port Number 0~2: Port 0 to Port 2 Others: Reserved Data Byte 1 7:0 Data Byte for register bits[7:0] Data Byte 2 7:0 Data Byte for register bits [15:8] Table 6-3 is a sample to writ e SSVID register (offset B4h) in Port 1. The register value is 1234h, and the default SMBus Address is 1011000b. Table 6-3 Sample SMBus Write Byte Sequence Byte Number Byte Type Value Description

1 Address D0h Bits [7:1] for the PI7C9X2G 304SV default Slave address of 68h, with bit

0 Cleared to indicate a Write.

2 Cmd Code 08h Command Code

3 Offset B4h Register address bits [7:0]

4 Port 01h For Port 1

5 Address D0h Bits [7:1] for the PI7C9X2G 304SV default Slave address of 68h, with bit

0 Cleared to indicate a Write.

6 Cmd Code 08h Command Code

7 Data Byte 1 34h Data Byte for register bits [7:0]

8 Data Byte 2 12h Data Byte for register bits [15:8]

6.2.2 SMBUS READ

The Read command is used to read the PI7C9X 2G304SV registers. General SMBus Reads are illustrated in Figure 6-3. Table 6-4 explains the elements used in Figure 6-3. Figure 6-3 SMBus Read Command Format, to Read that Returns CFG Register Value (PEC disabled) : Master to Slave : Slave to Master S Slave Addr Wr Cmd code = 08h S Slave Adress Rd A A A A A Data Byte 1 Data Byte 2 P S Slave Addr Wr Cmd Code = 08h Offset Port A A A A P S Slave Addr Wr Cmd Code = 08h Data Byte 1 Data Byte 2 A A A A P S Slave Addr Wr Cmd Code = 08h Offset Port A A A A P P

PI7C9X2G304SV Page 39 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Table 6-4 Bytes for SMBus Read Field (Byte) On Bus Bit(s) Value/ Description S 1 START condition P 1 STOP condition A 1 Acknowledge (this bit position may be 0 for an ACK or 1 for a NACK) Cmd Code 7:0 08h Offset 7:0 PI7C9X2G304SV Register Address [7:0] Port 7:0 Port Number 0~2: Port 0 to Port 2 Others: Reserved Data Byte 1 7:0 Return value for CFG register bits [7:0] Data Byte 2 7:0 Return value for CFG register bits [15:8] Table 6-5 is a sample to Read SSVID register (offset B4h) in Port 1. The register value is 0000h and the default SMBus Address is 1011000b. Table 6-5 SMBus Block Write Portion Byte Number Byte Type Value Description 0 Cleared to indicate a Write. 0 Cleared to indicate a Write.

7 Address D1h Bits [7:1] for the PI7C9X2G 304SV default Slave address of 68h, with bit

0 set 1 to indicate a Read.

8 Data Byte 1 00h Data Byte for register bits [7:0]

9 Data Byte 2 00h Data Byte for register bits [15:8]

6.3 I2C SLAVE INTERFACE

Inter-Integrated Circuit (I2C) is a bus used to connect Integrated Circuits (ICs). Multiple ICs can be connected to an I 2C Bus, and I2C devices that have I 2C mastering capability can initiate a Data transfer. I 2C is used for Data transfers between ICs at relatively low rates (100 Kbps), and is used in a variety of applications. For further details regarding I 2C Buses, refer to the I2C Bus v2.1. The PI7C9X2G304SV is an I2C Slave. Slave op erations allow the PI7C9X2G 304SV Configuration registers to be read from or written to by an I 2C Master, external from the device. I 2C is a sideband mechanism that allows the device Configuration registers to be programmed, read from, or written to, independent of the PCI Express upstream Link.

PI7C9X2G304SV Page 40 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Figure 6-4 Standard Devices to I2C Bus Connection Block Diagram The I 2C interface on the Packet Switch consists of a I 2C clock pin ( SMBCLK), a I 2C data pin ( SMBDATA), and 3 I 2C address pins ( GPIO[7:5]). The I 2C clock pin provides or receives the clock signal. The I 2C data pin facilitates the data transmission and reception. Both of the clock and data pins are bi -directional. The I2C address pins determine the address to which the Packet Switch responds to. The I2C address pins generate addresses according to the following table: Table 6-6 I2C Address Pin Configuration BIT I2C Address

6.3.1 I2C REGISTER WRITE ACCESS

The PI7C9X2G 304SV Configuration registers can be read from and written to, based upon I 2C register Read and Write operations, respectively. An I2C Write packet consists of Address Phase bytes and Command Phase bytes, followed by one to four additional I2C Data bytes. Table 6-7 defines mapping of the I2C Data bytes to the Configuration register Data bytes. The I 2C packet starts with the S (START condition) bit. Data bytes are separated by the A (Acknowledge Control Packet (ACK)) or N (Negative Acknowledge (NAK)) bit. The packet ends with the P (STOP condition) bit. If the Master generates an invalid command， the targeted PI7C9X2G304SV register is not modified. The PI7C9X2G 304SV considers the 1st Data byte of the 4 -byte Data phase, following the four Command bytes i n the Command phase, as register Byte 3 (bits [31:24]). The next three Data bytes access register Bytes 2 through 0, respectively. Four Data bytes are required, regardless of the Byte Enable Settings in the Command phase. The Master can then generate either a STOP condition (to finish the transfer) or a repeated START condition (to start a new transfer). If the I 2C Master sends more than the four Data bytes (violating PI7C9X2G 304SV protocol), further details regarding I2C protocol, the PI7C9X2G304SV returns a NAK for the extra Data byte(s). Table 6-8 describes each I 2C Command byte for Write access. In the packet described in Figure 6-5, Command Bytes 0 through 3 for Writes follow the format specified in Table 6-8. +VDD Pull-up resistors RP RP SMBDATA (Serical Data Line) SMBCLK (Serical Clock Line) External I2C Master PI7C9X2G 304SV

PI7C9X2G304SV Page 41 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Table 6-7 I2C Register Write Access I2C Data Byte Order PCI Express Configuration Register Byte

0 Written to register Byte 3

1 Written to register Byte 2

2 Written to register Byte 1

3 Written to register Byte 0

Table 6-8 I2C Command Format for Write Access Byte Bit(s) Description 1st (0) 7:3 Reserved 2:0 Command 011b = Write register 2nd (1) 7:6 Reserved

0 Port Select[1]

2nd Command byte, bits [0], and 3rd Command byte, bit 7, combine to form a 2-bit Port Select. 3rd (2) 7 Port Select[0] 2nd Command byte, bits [0], and 3rd Command byte, bit 7, combine to form a 2-bit Port Select. Port Select[1:0] is used to select Port to access. 0… Port 0 1… Port 1 2… Port 2

6 Reserved

5:2 Byte Enable Bit Description

2 Byte Enable for Data Byte 4 (PI7C9X2G304SV register bits [7:0])

3 Byte Enable for Data Byte 3 (PI7C9X2G304SV register bits [15:8])

4 Byte Enable for Data Byte 2 (PI7C9X2G304SV register bits [23:16])

5 Byte Enable for Data Byte 1 (PI7C9X2G304SV register bits [31:24])

0 = Corresponding PI7C9X2G304SV register byte will not be modified 1 = Corresponding PI7C9X2G304SV register byte will be modified 1:0 PI7C9X2G304SV Register Address [11:10] 4th (3) 7:0 PI7C9X2G304SV Register Address [9:2] Note: Address bits[1:0] are fixed to 0. Figure 6-5 I2C Write Packet I2C Write Packet Address Phase Byte Address Cycle START 7654321 0 ACK/NAK S Slave Address [7:1] Read/Write Bit 0 = Write A I2C Write Packet Command Phase Byte Command Cycle

76543210 ACK/NAK 76543210 ACK/NAK 76543210 ACK/NAK 76543210 ACK/NAK

A I2C Write Packet Data Phase Byte Write Cycle

76543210 ACK/NAK 76543210 ACK/NAK 76543210 ACK/NAK 76543210 ACK/NAK STOP

Register Byte 3 A Register Byte 2 A Register Byte 1 A Register Byte 0 A P The following tables illustrate a sample I2C packet for writing the PI7C9X2G 304SV SSID/SSVID register (offset B4h) for Port 0, with data 1234_5678h and suppose GPIO[7:5] is set to 000b.

PI7C9X2G304SV Page 42 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Figure 6-6 I2C Register Write Access Example I2C Register Write Access Example – Address Cycle Phase Value Description Address 70h Bits [7:1] for PI7C9X2G304SV I2C Slave Address (38h) with last bit (bit 0) for Write = 0 I2C Register Write Access Example – Command Cycle Byte Value Description 0 03h [7:3] Reserved [2:0] Command, 011b = Write register 1 00h for Port 0 [7:6] Reserved [0] Port Select[1] 2 3Ch for Port 0 [7] Port Select[0] [6] Reserved [5:2] Byte Enable, all active. [1:0] PI7C9X2G304SV Register Address, Bits [11:10] 3 2Dh [7:0] PI7C9X2G304SV Register Address, Bits [9:2] I2C Register Write Access Example – Data Cycle Byte Value Description 0 12h Data to Write for Byte 3 1 34h Data to Write for Byte 2 2 56h Data to Write for Byte 1 3 78h Data to Write for Byte 0 Figure 6-7 I2C Write Command Packet Example I2C Write Packet Address Phase Bytes 1st Cycle START 7654321 0 ACK/NAK S Slave Address 1011_000b Read/Write Bit 0 = Write A I2C Write Packet Command Phase Bytes Command Cycle 0000_0011b A Command Byte 1 0000_0000b A Command Byte 2 0011_1100b A Command Byte 3 0010_1101b A I2C Write Packet Data Phase Bytes Write Cycle 0001_0010b A Register Byte 2 0011_0100b A Register Byte 1 0101_0110b A Register Byte 0 0111_1000h A P

6.3.2 I2C REGISTER READ ACCESS

When the I 2C Master attempts to read a PI7C9X2G 304SV register, two packets are transmitted. The 1 st packet consists of Address and Command Phase bytes to the Slave. The 2nd packet consists of Address and Data Phase bytes. According to the I 2C Bus, v2.1, a Read cycle is triggered when the Read/Write bit (bit 0) of the 1 st cycle is Set. The Command phase reads the requested register content into the internal buffer. When the I 2C Read access occurs, the internal buffer value is transferred on to the I 2C Bus, starting from Byte 3 (bits [31: 24]), followed by the subsequent bytes, with Byte 0 (bits [7:0]) being transferred last. If the I 2C Master requests more than four bytes, the PI7C9X2G 304SV re-transmits the same byte sequence, starting from Byte 3 of the internal buffer.

PI7C9X2G304SV Page 43 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV The 1st and 2nd I2C Read packets perform the following functions:  1st packet - Selects the register to read  2nd packet - Reads the register (sample 2nd packet provided is for a 7-bit PI7C9X2G304SV I2C Slave address) Although two packets are shown for the I2C Read, the I2C Master can merge the two packets together into a single packet, by not generating the STOP at the end of the first packet (Master does not relinquish the bus) and generating REPEAT START. Table 6-9 describes each I 2C Command byte for Read access. In the packet described in Figure 6-8, Command Bytes 0 through 3 for Reads follow the format specified in Table 6-9. Table 6-9 I2C Command Format for Read Access Byte Bit(s) Description 1st (0) 7:3 Reserved 2:0 Command 100b = Read register 2nd (1) 7:6 Reserved

0 Port Select, Bits [1]

2nd Command byte, bit [0], and 3rd Command byte, bit 7, combine to form a 2-bit Port Select. 3rd (2) 7 Port Select[0] 2nd Command byte, bits [3:0], and 3rd Command byte, bit 7, combine to form a 2-bit Port Select. Port Select[1:0] is used to select Port to access. 0… Port 0 1… Port 1 2… Port 2 5:2 Byte Enable Bit Description 0 = Corresponding PI7C9X2G304SV register byte will not be modified 1 = Corresponding PI7C9X2G304SV register byte will be modified 1:0 PI7C9X2G304SV Register Address [11:10] 4th (3) 7:0 PI7C9X2G304SV Register Address [9:2] Note: Address bits[1:0] are fixed to 0. Figure 6-8 I2C Read Command Packet I2C Read Command Packet Address Phase Byte (1st Packet) 1st Cycle START 7654321 0 ACK/NAK S Slave Address[7:1] Read/Write Bit 0 = Write A I2C Read Command Packet Command Phase Byte (1st Packet) Write Cycle A I2C Read Data Packet Address Phase Byte (2nd Packet) 1st Cycle START 7654321 0 ACK/NAK S Slave Address[7:1] Read/Write Bit 1 = Read A

PI7C9X2G304SV Page 44 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV I2C Read Data Packet Data Phase Byte (2nd Packet) Write Cycle The following tables illustrate a sample I2C packet for reading the PI7C9X2G 304SV SSID/SSVID register (offset B4h) for Port 0. The default value for SSID/SSVID register is 0000_0000h and suppose GPIO[7:5]=000b. Figure 6-9 I2C Register Read Access Example I2C Register Read Access Example – Address Cycle (1st Packet) Phase Value Description Address 70h Bits [7:1] for PI7C9X2G304SV I2C Slave Address (38h) with last bit (bit 0) for Write = 0 I2C Register Read Access Example – Command Cycle (1st Packet) Byte Value Description 0 04h [7:3] Reserved [2:0] Command , 100b = Read register 1 00h for Port 0 [7:6] Reserved [0] Port Select[1] 2 3Ch for Port 0 [7] Port Select[0] [6] Reserved [5:2] Byte Enable, All active. [1:0] PI7C9X2G304SV Register Address, Bits [11:10] 3 2Dh [7:0] PI7C9X2G304SV Register Address, Bits [9:2] I2C Register Read Access Example – 2nd Packet Phase Value Description Address 71h Bits [7:1] for PI7C9X2G304SV I2C Slave Address (38h) with last bit (bit 0) for Read = 1 Read 00h Byte 3 of Register Read 00h Byte 2 of Register Read 00h Byte 1 of Register Read 00h Byte 0 of Register Read Figure 6-10 I2C Read Command Packet I2C Read Command Packet Address Phase Bytes (1st Packet) 1st Cycle START 7654321 0 ACK/NAK S Slave Address 1011_000b Read/Write Bit 0 = Write A I2C Read Command Packet Command Phase Bytes (1st Packet) Command Cycle

76543210 ACK/NAK 76543210 ACK/NAK 76543210 ACK/NAK 76543210

0000_0100b A Command Byte 1 0000_0000b A Command Byte 2 0011_1100b A Command Byte 3 0010_1101b I2C Read Data Packet Address Phase Bytes (2nd Packet) 1st Cycle START 7654321 0 ACK/NAK S Slave Address [7:1] 0111_000b Read/Write Bit 1 = Read A

PI7C9X2G304SV Page 45 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV I2C Read Data Packet Data Phase Bytes (2nd Packet) Command Cycle

76543210 ACK/NAK 76543210 ACK/NAK 76543210 ACK/NAK 76543210 Stop

0000_0000b A Register Byte2 0000_0000b A Register Byte1 0000_0000b A Register Byte0 0000_00000b P

7 REGISTER DESCRIPTION

7.1 REGISTER TYPES

HwInt Hardware Initialization RO Read Only RW Read / Write RWC Read / Write 1 to Clear RWCS Sticky – Read Only / Write 1 to Clear RWS Sticky – Read / Write ROS Sticky – Read Only

7.2 TRANSPARENT MODE CONFIGURATION REGISTERS

When the port of the Switch is set to operate at the transparent mode, it is represented by a logical PCI -to-PCI Bridge that implements type 1 configuration space header. The following table details the allocation of the register fields of the PCI 2.3 compatible type 1 configuration space header. 31 –24 23 – 16 15 – 8 7 –0 BYTE OFFSET Device ID Vendor ID 00h Primary Status Command 04h Class Code Revision ID 08h Reserved Header Type Primary Latency Timer Cache Line Size 0Ch Reserved 10h – 17h Secondary Latency Timer Subordinate Bus Number Secondary Bus Number Primary Bus Number 18h Secondary Status I/O Limit Address I/O Base Address 1Ch Memory Limit Address Memory Base Address 20h Prefetchable Memory Limit Address Prefetchable Memory Base Address 24h Prefetchable Memory Base Address Upper 32-bit 28h Prefetchable Memory Limit Address Upper 32-bit 2Ch I/O Limit Address Upper 16-bit I/O Base Address Upper 16-bit 30h Reserved Capability Pointer to 40h 34h Reserved 38h Bridge Control Interrupt Pin Interrupt Line 3Ch Power Management Capabilities Next Item Pointer= 4Ch Capability ID=01h 40h PM Data PPB Support Extensions Power Management Data 44h Message Control Next Item Pointer=: 64h Capability ID=05h 4Ch Message Address 50h Message Upper Address 54h Reserved Message Data 58h Reserved 5Ch – 60h Length in Bytes (34h) Next Item Pointer=B0h Capability ID=09h 64h XPIP_CSR0 68h XPIP_CSR1 6Ch ACK Latency Timer Replay Time-out Counter 70h PHY Parameter 0 Switch Modes 74h PHY Parameter 1 XPIP_CSR2 78h PHY Parameter 2 7Ch XPIP_CSR3 80h XPIP_CSR4 84h XPIP_CSR5 88h XPIP_CSR7 XPIP_CSR6 TL_CSR0 8Ch PHY parameter 3 90h

PI7C9X2G304SV Page 47 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV 31 –24 23 – 16 15 – 8 7 –0 BYTE OFFSET Reserved PHYL1 RXEQ PHY TX Margin parameter 94h Reserved Buffer Ctrl OP Mode 98h Debug Control 9Ch Debug Data Output A0h Reserved A4h – ACh Reserved Next Item Pointer=C0h SSID/SSVID Capability ID=0Dh B0h SSID SSVID B4h GPIO Data and Control B8h EEPROM Data EEPROM Address EEPROM Control BCh PCI Express Capabilities Register Next Item Pointer=00h Capability ID=10h C0h Device Capabilities C4h Device Status Device Control C8h Link Capabilities CCh Link Status Link Control D0h Slot Capabilities D4h Slot Status Slot Control D8h Reserved DCh Reserved E0h Device Capabilities 2 E4h Device Status / Control 2 E8h Link Capabilities 2 ECh Link Status /Control 2 F0h Slot Capabilities 2 F4h Slot Status /Control 2 F8h Reserved FCh Other than the PCI 2.3 compatible configuration space header, the Switch also implements PCI express extended configuration space header, which includes advanced error reporting, virtual channel, and power budgeting capability registers. The following table details the allocation of the register fields of PCI express extended capability space header. The first extended capability always begins at offset 100h with a PCI Express Enhanced Capability header and the rest of capabilities are located at an offset greater than 0FFh relative to the beginning of PCI compatible configuration space. 31 –24 23 – 16 15 - 8 7 –0 BYTE OFFSET Next Capability Offset=140h Cap. Version PCI Express Extended Capability ID=0001h 100h Uncorrectable Error Status Register 104h Uncorrectable Error Mask Register 108h Uncorrectable Error Severity Register 10Ch Correctable Error Status Register 110h Correctable Error Mask Register 114h Advanced Error Capabilities and Control Register 118h Header Log Register 11Ch – 128h Reserved 12Ch – 13Fh Next Capability Offset=20Ch Cap. Version PCI Express Extended Capability ID=0002h 140h Port VC Capability Register 1 144h VC Arbitration Table Offset=3 Port VC Capability Register 2 148h Port VC Status Register Port VC Control Register 14Ch Port Arbitration Table Offset=4 VC Resource Capability Register (0) 150h VC Resource Control Register (0) 154h VC Resource Status Register (0) Reserved 158h Port Arbitration Table Offset=6 VC Resource Capability Register (1) 15Ch VC Resource Control Register (1) 160h VC Resource Status Register (1) Reserved 164h Reserved 16Ch – 168h VC Arbitration Table with 32 Phases 170h – 17Ch Port Arbitration Table with 128 Phases for VC0 180h – 1BCh Port Arbitration Table with 128 Phases for VC1 1C0h – 1FCh Reserved 200h – 20Bh

PI7C9X2G304SV Page 48 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV 31 –24 23 – 16 15 - 8 7 –0 BYTE OFFSET Next Capability Offset=220h/230h Cap. Version PCI Express Extended Capability ID=0004h 20Ch Reserved Data Select Register 210h Data Register 214h Reserved Power Budget Capability Register 218h Reserved 21Ch Next Capability Offset=240h Cap version PCI Express Extended Capability ID=000Dh 220h ACS Control ACS Capability 224h Reserved Egress Control Vector 228h Reserved 22Ch Next Capability Offset=240h Cap version PCI Express Extended Capability ID=0018h 230h Reserved Max No- Snoop Latency Scale Max No-Snoop Latency Value Reserved Max Snoop Latency Scale Max Snoop Latency Value 234h Reserved 238h – 23Ch Next Capability Offset=260h/250h Cap version PCI Express Extended Capability ID=001Eh 240h L1 PM Substates Capability 244h L1 PM Substates Control 1 248h L1 PM Substates Control 2 24Ch Next Capability Offset=000h Cap version PCI Express Extended Capability ID=001Dh 250h DPC Control DPC Capability 254h DPC Error Source ID DPC Status 258h Reserved 25Ch Next Capability Offset=000h Cap version PCI Express Extended Capability ID=00FEh 260h PTM Capability 264h PTM Control 268h Reserved 26Ch – 2FCh Misc Control 0 300h Misc Control 1 304h Misc Control 2 308h Misc Control 3 30Ch Misc Control 4 310h Reserved 314h PHY/DLL/TL Error Counter 318h Reserved 31Ch Port Physical Layer Command and Status 320h Port Disable / Quiet / Test Pattern Rate 324h LED_CSR0 328h LED_CSR1 32Ch Reserved 338h – 330h LTSSM_CSR 33Ch MAC_CSR 340h TL_CSR1 344h Debugout Control 348h Debugout Data 34Ch

7.2.1 VENDOR ID REGISTER – OFFSET 00h

BIT FUNCTION TYPE DESCRIPTION 15:0 Vendor ID RO HWInt Identifies Pericom as the vendor of this device. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 12D8h.

7.2.2 DEVICE ID REGISTER – OFFSET 00h

BIT FUNCTION TYPE DESCRIPTION 31:16 Device ID RO Identifies this device as the PI7C9X2 G304SV. The default value may be changed by SMBus or auto-loading from EEPROM. Resets to B304h.

7.2.3 COMMAND REGISTER – OFFSET 04h

BIT FUNCTION TYPE DESCRIPTION

0 I/O Space Enable RW

0b: Ignores I/O transactions on the primary interface 1b: Enables responses to I/O transactions on the primary interface Resets to 0b.

1 Memory Space Enable RW

0b: Ignores memory transactions on the primary interface 1b: Enables responses to memory transactions on the primary interface Reset to 0b.

2 Bus Master Enable RW

0b: Does not initiate memory or I/O transactions on the upstream port and handles as an Unsupported Request (UR) to memory and I/O transactions on the downstream port. For Non-Posted Requests, a completion with UR completion status must be returned 1b: Enables the Switch Port to forward memory and I/O Read/Write transactions in the upstream direction Reset to 0b. 3 Special Cycle Enable RO Does not apply to PCI Express. Must be hardwired to 0b.

4 Memory Write And

Invalidate Enable RO Does not apply to PCI Express. Must be hardwired to 0b.

5 VGA Palette Snoop

Enable RO Does not apply to PCI Express. Must be hardwired to 0b.

6 Parity Error Response

0b: Switch may ignore any parity errors that it detects and continue normal operation 1b: Switch must take its normal action when a parity error is detected Reset to 0b. 7 Wait Cycle Control RO Does not apply to PCI Express. Must be hardwired to 0.

8 SERR# enable RW

0b: Disables the reporting of Non-fatal and Fatal errors detected by the Switch to the Root Complex b1: Enables the Non-fatal and Fatal error reporting to Root Complex Reset to 0b.

9 Fast Back-to-Back

Enable RO Does not apply to PCI Express. Must be hardwired to 0b.

10 Interrupt Disable RW

Controls the ability of a PCI Express device to generate INTx Interrupt Messages. In the Switch, this bit does not affect the forwarding of INTx messages from the downstream ports. Reset to 0b. 15:11 Reserved RsvdP Not Support.

7.2.4 PRIMARY STATUS REGISTER – OFFSET 04h

BIT FUNCTION TYPE DESCRIPTION 18:16 Reserved RsvdP Not Support.

19 Interrupt Status RO

Indicates that an INTx Interrupt Message is pending internally to the device. In the Switch, the forwarding of INTx messages from the downstream device of the Switch port is not reflected in this bit. Must be hardwired to 0b.

20 Capabilities List RO

Set to 1 to enable support for the capability list (offset 34h is the pointer to the data structure). Reset to 1b. 21 66MHz Capable RO Does not apply to PCI Express. Must be hardwired to 0b. 22 Reserved RsvdP Not Support.

23 Fast Back-to-Back

Capable RO Does not apply to PCI Express. Must be hardwired to 0b.

24 Master Data Parity

Set to 1 (by a requester) whenever a Parity error is detected or forwarded on the primary side of the port in a Switch. If the Parity Error Response Enable bit is cleared, this bit is never set. Reset to 0b. 26:25 DEVSEL# timing RO Does not apply to PCI Express. Must be hardwired to 0b.

27 Signaled Target Abort RO

Set to 1 (by a completer) whenever completing a request on the primary side using the Completer Abort Completion Status. Reset to 0b.

28 Received Target Abort RO

Set to 1 (by a requestor) whenever receiving a Completion with Completer Abort Completion Status on the primary side. Reset to 0b.

29 Received Master

Set to 1 (by a requestor) whenever receiving a Completion with Unsupported Request Completion Status on primary side. Reset to 0b.

30 Signaled System Error RWC

Set to 1 when the Switch sends an ERR_FATAL or ERR_NONFATAL Message, and the SERR Enable bit in the Command register is 1. Reset to 0b.

31 Detected Parity Error RWC

Set to 1 whenever the primary side of the port in a Switch receives a Poisoned TLP. Reset to 0b.

7.2.5 REVISION ID REGISTER – OFFSET 08h

BIT FUNCTION TYPE DESCRIPTION 7:0 Revision RO Indicates revision number of device. Hardwired to 00h.

7.2.6 CLASS CODE REGISTER – OFFSET 08h

BIT FUNCTION TYPE DESCRIPTION 15:8 Programming Interface RO Read as 00h to indicate no programming interfaces have been defined for PCI -to-PCI Bridges. 23:16 Sub-Class Code RO Read as 04h to indicate device is a PCI-to-PCI Bridge. 31:24 Base Class Code RO Read as 06h to indicate device is a Bridge device.

7.2.7 CACHE LINE REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Cache Line Size RW The cache line size register is set by the system firmware and the operating system cache line size. This field is implemented by PCI Express devices as a RW field for legacy compatibility, but it has no impact on any PCI Express device functionality. Reset to 00h.

7.2.8 PRIMARY LATENCY TIMER REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Primary Latency timer RO Does not apply to PCI Express. Must be hardwired to 00h.

7.2.9 HEADER TYPE REGISTER – OFFSET 0Ch

BIT FUNCTION TYPE DESCRIPTION 23:16 Header Type RO Read as 01h to indicate that the register layout conforms to the standard PCI -to-PCI Bridge layout.

7.2.10 PRIMARY BUS NUMBER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 7:0 Primary Bus Number RW Indicates the number of the PCI bus to which the primary interface is connected. The value is set in software during configuration. Reset to 00h.

7.2.11 SECONDARY BUS NUMBER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 15:8 Secondary Bus Number RW Indicates the number of the PCI bus to which the secondary interface is connected. The value is set in software during configuration. Reset to 00h.

7.2.12 SUBORDINATE BUS NUMBER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 23:16 Subordinate Bus Number RW Indicates the number of the PCI bus with the highest number that is subordinate to the Bridge. The value is set in software during configuration. Reset to 00h.

7.2.13 SECONDARY LATENCY TIMER REGISTER – OFFSET 18h

BIT FUNCTION TYPE DESCRIPTION 31:24 Secondary Latency Timer RO Does not apply to PCI Express. Must be hardwired to 00h.

7.2.14 I/O BASE ADDRESS REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 3:0 32-bit Indicator RO Read as 1h to indicate 32-bit I/O addressing. 7:4 I/O Base Address [15:12] RW Defines the bottom address of the I/O address range for the Bridge to determine when to forward I/O transactions from one interface to the other. The upper 4 bits correspond to address bits [15:12] and are writable. The lower 12 bits corresponding to address bits [11:0] are assumed to be 0. The upper 16 bits corresponding to address bits [31:16] are defined in the I/O base address upper 16 bits address register. Reset to 0h.

7.2.15 I/O LIMIT ADDRESS REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 11:8 32-bit Indicator RO Read as 1h to indicate 32-bit I/O addressing. 15:12 I/O Limit Address [15:12] RW Defines the top address of the I/O address range for the Bridge to determine when to forward I/O transactions from one interface to the other. The upper 4 bits correspond to address bits [15:12] and are writable. The lower 12 bits corresponding to address bits

PI7C9X2G304SV Page 52 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION [11:0] are assumed to be FFFh. The upper 16 bits corresponding to address bits [31:16] are defined in the I/O limit address upper 16 bits address register. Reset to 0h.

7.2.16 SECONDARY STATUS REGISTER – OFFSET 1Ch

BIT FUNCTION TYPE DESCRIPTION 20:16 Reserved RsvdP Not Support. 21 66MHz Capable RO Does not apply to PCI Express. Must be hardwired to 0b. 22 Reserved RsvdP Not Support. Capable RO Does not apply to PCI Express. Must be hardwired to 0b. Set to 1 (by a requester) whenever a Parity error is detected or forwarded on the secondary side of the port in a Switch. If the Parity Error Response Enable bit is cleared, this bit is never set. Reset to 0b. 26:25 DEVSEL_L timing RO Does not apply to PCI Express. Must be hardwired to 0b. Set to 1 (by a completer) whenever completing a request in the secondary side using Completer Abort Completion Status. Reset to 0b. Set to 1 (by a requestor) whenever receiving a Completion with Completer Abort Completion Status in the secondary side. Reset to 0b. Set to 1 (by a requestor) whenever receiving a Completion with Unsupported Request Completion Status in secondary side. Reset to 0b.

30 Received System Error RWC

Set to 1 when the Switch sends an ERR_FATAL or ERR_NONFATAL Message, and the SERR Enable bit in the Bridge Control register is 1. Reset to 0b. Set to 1 whenever the secondary side of the port in a Switch receives a Poisoned TLP. Reset to 0b.

7.2.17 MEMORY BASE ADDRESS REGISTER – OFFSET 20h

BIT FUNCTION TYPE DESCRIPTION 3:0 Reserved RsvdP Not Support. 15:4 Memory Base Address [15:4] RW Defines the bottom address of an address range for the Bridge to determine when to forward memory transactions from one interface to the other. The upper 12 bits correspond to address bits [31:20] and are able to be written to. The lower 20 bits corresponding to address bits [19:0] are assumed to be 0. Reset to 000h.

7.2.18 MEMORY LIMIT ADDRESS REGISTER – OFFSET 20h

BIT FUNCTION TYPE DESCRIPTION 19:16 Reserved RsvdP Not Support. 31:20 Memory Limit Address [31:20] RW Defines the top address of an address range for the Bridge to determine when to forward memory transactions from one interface to the other. The upper 12 bits correspond to address bits [31:20] and are writable. The lower 20 bits corresponding to address bits [19:0] are assumed to be FFFFFh. Reset to 000h.

7.2.19 PREFETCHABLE MEMORY BASE ADDRESS REGISTER – OFFSET 24h

BIT FUNCTION TYPE DESCRIPTION 3:0 64-bit addressing RO Read as 1h to indicate 64-bit addressing. 15:4 Prefetchable Memory Base Address [31:20] RW Defines the bottom address of an address range for the Bridge to determine when to forward memory read and write transactions from one interface to the other. The upper 12 bits correspond to address bits [31:20] and are writable. The lower 20 bits are assumed to be 0. The memory base register upper 32 bits contain the upper half of the base address. Reset to 000h.

7.2.20 PREFETCHABLE MEMORY LIMIT ADDRESS REGISTER – OFFSET 24h

BIT FUNCTION TYPE DESCRIPTION 19:16 64-bit addressing RO Read as 1h to indicate 64-bit addressing. 31:20 Prefetchable Memory Limit Address [31:20] RW Defines the top address of an address range for the Bridge to determine when to forward memory read and write transactions from one interface to the other. The upper 12 bits correspond to address bits [31:20] and are writable. The lower 20 bits are assumed to be FFFFFh. The memory limit upper 32 bits register contains the upper half of the limit address. Reset to 000h.

7.2.21 PREFETCHABLE MEMORY BASE ADDRESS UPPER 32-BITS REGISTER –

BIT FUNCTION TYPE DESCRIPTION 31:0 Prefetchable Memory Base Address, Upper 32-bits [63:32] RW Defines the upper 32-bits of a 64-bit bottom address of an address range for the Bridge to determine when to forward memory read and write transactions from one interface to the other. Reset to 0000_0000h.

7.2.22 PREFETCHABLE MEMORY LIMIT ADDRESS UPPER 32-BITS REGISTER –

BIT FUNCTION TYPE DESCRIPTION 31:0 Prefetchable Memory Limit Address, Upper 32-bits [63:32] RW Defines the upper 32-bits of a 64-bit top address of an address range for the Bridge to determine when to forward memory read and write transactions from one interface to the other. Reset to 0000_0000h.

7.2.23 I/O BASE ADDRESS UPPER 16-BITS REGISTER – OFFSET 30h

BIT FUNCTION TYPE DESCRIPTION 15:0 I/O Base Address, Upper 16-bits [31:16] RW Defines the upper 16-bits of a 32-bit bottom address of an address range for the Bridge to determine when to forward I/O transactions from one interface to the other. Reset to 0000h.

7.2.24 I/O LIMIT ADDRESS UPPER 16-BITS REGISTER – OFFSET 30h

BIT FUNCTION TYPE DESCRIPTION 31:16 I/O Limit Address, Upper 16-bits [31:16] RW Defines the upper 16-bits of a 32-bit top address of an address range for the Bridge to determine when to forward I/O transactions from one interface to the other. Reset to 0000h.

7.2.25 CAPABILITY POINTER REGISTER – OFFSET 34h

BIT FUNCTION TYPE DESCRIPTION 7:0 Capability Pointer RO Pointer points to the PCI power management registers. Reset to 40h.

7.2.26 INTERRUPT LINE REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Interrupt Line RW Reset to 00h.

7.2.27 INTERRUPT PIN REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION 15:8 Interrupt Pin RO The Switch implements INTA virtual wire interrupt signals to represent hot-plug events at downstream ports. The default value on the downstream ports may be changed by SMBus or auto-loading from EEPROM. Reset to 00h.

7.2.28 BRIDGE CONTROL REGISTER – OFFSET 3Ch

BIT FUNCTION TYPE DESCRIPTION

16 Parity Error Response RW

0b: Ignore Poisoned TLPs on the secondary interface 1b: Enable the Poisoned TLPs reporting and detection on the secondary interface Reset to 0b.

17 S_SERR# enable RW

0b: Disables the forwarding of EER_COR, ERR_NONFATAL and ERR_FATAL from secondary to primary interface 1b: Enables the forwarding of EER_COR, ERR_NONFATAL and ERR_FATAL from secondary to primary interface Reset to 0b.

18 ISA Enable RW

0b: Forwards downstream all I/O addresses in the address range defined by the I/O Base, I/O Base, and Limit registers 1b: Forwards 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 0b.

19 VGA Enable RW

0: Ignores access to the VGA memory or IO address range 1: Forwards transactions targeted at the VGA memory or IO address range VGA memory range starts from 000A 0000h to 000B FFFFh VGA IO addresses are in the first 64KB of IO address space. AD [9:0] is in the ranges 3B0 to 3BBh and 3C0h to 3DFh. Reset to 0b.

20 VGA 16-bit decode RW 0b: Executes 10-bit address decoding on VGA I/O accesses

1b: Executes 16-bit address decoding on VGA I/O accesses

PI7C9X2G304SV Page 55 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION Reset to 0b. 21 Master Abort Mode RO Does not apply to PCI Express. Must be hardwired to 0b.

22 Secondary Bus Reset RW

0b: Does not trigger a hot reset on the corresponding PCI Express Port 1b: Triggers a hot reset on the corresponding PCI Express Port At the downstream port, it asserts PORT_RST# to the attached downstream device. At the upstream port, it asserts the PORT_RST# at all the downstream ports. Reset to 0b. Enable RO Does not apply to PCI Express. Must be hardwired to 0b.

24 Primary Master

Timeout RO Does not apply to PCI Express. Must be hardwired to 0b.

25 Secondary Master

Timeout RO Does not apply to PCI Express. Must be hardwired to 0b. 26 Master Timeout Status RO Does not apply to PCI Express. Must be hardwired to 0b.

27 Discard Timer SERR#

enable RO Does not apply to PCI Express. Must be hardwired to 0b. 31:28 Reserved RsvdP Not Support.

7.2.29 POWER MANAGEMENT CAPABILITY REGISTER – OFFSET 40h

BIT FUNCTION TYPE DESCRIPTION 7:0 Enhanced Capabilities ID RO Read as 01h to indicate that these are power management enhanced capability registers. 15:8 Next Item Pointer RO The pointer points to the Message capability register. Reset to 4Ch. 18:16 Power Management Revision RO Read as 011b to indicate the device is compliant to Revision 1.2 of PCI Power Management Interface Specifications. 19 PME# Clock RO Does not apply to PCI Express. Must be hardwired to 0b. 20 Reserved RsvdP Not Support.

21 Device Specific

Initialization RO Read as 0b to indicate Switch does not have device specific initialization requirements. The default value may be changed by SMBus or auto-loading from EEPROM. 24:22 AUX Current RO Reset as 111b to indicate the Switch needs 375 mA in D3 state. The default value may be changed by SMBus or auto-loading from EEPROM.

25 D1 Power State

Support RO Read as 1b to indicate Switch supports the D1 power management state. The default value may be changed by SMBus or auto-loading from EEPROM.

26 D2 Power State

Support RO Read as 1b to indicate Switch supports the D2 power management state. The default value may be changed by SMBus or auto-loading from EEPROM. 31:27 PME# Support RO Read as 11111b to indicate Switch supports the forwarding of PME# message in all power states. The default value may be changed by SMBus or auto-loading from EEPROM.

7.2.30 POWER MANAGEMENT DATA REGISTER – OFFSET 44h

BIT FUNCTION TYPE DESCRIPTION 1:0 Power State RW Indicates the current power state of the Switch. Writing a value of D0 when the previous state was D3 cause a hot reset without asserting DWNRST_L. 00b: D0 state 01b: D1 state 10b: D2 state 11b: D3 hot state Reset to 00b. 2 Reserved RsvdP Not Support.

3 No_Soft_Reset RO

When set, this bit indicates that device transitioning from D3hot to D0 does not perform an internal reset. When clear, an internal reset is performed when power state transits from D3hot to D0. This bit can be rewritten with EEPROM programming. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 1b.

PI7C9X2G304SV Page 56 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 7:4 Reserved RsvdP Not Support. 8 PME# Enable RWS When asserted, the Switch will generate the PME# message. Reset to 0b. 12:9 Data Select RW Select data registers. Reset to 0h. 14:13 Data Scale RO Reset to 00b. 15 PME status ROS Read as 0b as the PME# message is not implemented.

7.2.31 PPB SUPPORT EXTENSIONS – OFFSET 44h

BIT FUNCTION TYPE DESCRIPTION 21:16 Reserved RsvdP Not Support.

22 B2_B3 Support for

D3HOT RO Does not apply to PCI Express. Must be hardwired to 0b.

23 Bus Power / Clock

Control Enable RO Does not apply to PCI Express. Must be hardwired to 0b.

7.2.32 DATA REGISTER – OFFSET 44h

BIT FUNCTION TYPE DESCRIPTION 31:24 Data Register RO Data Register. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 00h.

7.2.33 MSI CAPABILITY REGISTER – OFFSET 4Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Enhanced Capabilities ID RO Read as 05h to indicate that this is message signal interrupt capability register. 15:8 Next Item Pointer RO Pointer points to the Vendor specific capability register. Reset to 64h.

7.2.34 MESSAGE CONTROL REGISTER – OFFSET 4Ch

BIT FUNCTION TYPE DESCRIPTION

16 MSI Enable RW

0b: The function is prohibited from using MSI to request service 1b: The function is permitted to use MSI to request service and is prohibited from using its INTx # pin Reset to 0b. 19:17 Multiple Message Capable RO Read as 010b. 22:20 Multiple Message Enable RW Reset to 000b. 23 64-bit address capable RO 0b: The function is not capable of generating a 64-bit message address 1b: The function is capable of generating a 64-bit message address Reset to 1b. 31:24 Reserved RsvdP Not Support.

7.2.35 MESSAGE ADDRESS REGISTER – OFFSET 50h

BIT FUNCTION TYPE DESCRIPTION 1:0 Reserved RsvdP Not Support.

PI7C9X2G304SV Page 57 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 31:2 Message Address RW If the message enable bit is set, the contents of this register specify the DWORD aligned address for MSI memory write transaction. Reset to 0000_0000h.

7.2.36 MESSAGE UPPER ADDRESS REGISTER – OFFSET 54h

BIT FUNCTION TYPE DESCRIPTION 31:0 Message Upper Address RW This register is only effective if the device supports a 64-bit message address is set. Reset to 0000_0000h.

7.2.37 MESSAGE DATA REGISTER – OFFSET 58h

BIT FUNCTION TYPE DESCRIPTION 15:0 Message Data RW Reset to 0000h. 31:16 Reserved RsvdP Not Support.

7.2.38 VENDOR SPECIFIC CAPABILITY REGISTER – OFFSET 64h

BIT FUNCTION TYPE DESCRIPTION 7:0 Enhanced Capabilities ID RO Read as 09h to indicate that these are vendor specific capability registers. Reset to 09h. 15:8 Next Item Pointer RO Pointer points to the SSID/SSVID capability register. Reset to B0h. 31:16 Length Information RO The length field provides the information for number of bytes in the capability structure (including the ID and Next pointer bytes). Reset to 0034h.

7.2.39 XPIP CSR0 – OFFSET 68h (Test Purpose Only)

BIT FUNCTION TYPE DESCRIPTION 31:0 XPIP_CSR0 RW Reset to 0400_1060h.

7.2.40 XPIP CSR1 – OFFSET 6Ch (Test Purpose Only)

BIT FUNCTION TYPE DESCRIPTION 31:0 XPIP_CSR1 RW Reset to 0000_0800h.

7.2.41 REPLAY TIME-OUT COUNTER – OFFSET 70h

BIT FUNCTION TYPE DESCRIPTION 11:0 User Replay Timer RW A 12-bit register contains a user-defined value. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 000h.

12 Enable User Replay

When asserted, the user-defined replay time-out value is be employed. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

13 Power Management

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

14 MSI Capability

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 15 Reserved RsvdP Not Support.

7.2.42 ACKNOWLEDGE LATENCY TIMER – OFFSET 70h

BIT FUNCTION TYPE DESCRIPTION 29:16 User ACK Latency Timer RW A 14-bit register contains a user-defined value. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000h.

30 Enable User ACK

When asserted, the user-defined ACK latency value is be employed. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

31 VGA Decode Enable RO

Enable the VGA range decode. Reset to 1b.

7.2.43 SWITCH OPERATION MODE – OFFSET 74h (Upstream Port)

BIT FUNCTION TYPE DESCRIPTION

0 Store-Forward RW

When set, a store-forward mode is used. Otherwise, the chip is working under cut- through mode. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 2:1 Cut-through Threshold RW Cut-through Threshold. When forwarding a packet from low-speed port to high-speed mode, the chip provides the capability to adjust the forwarding threshold. The default value may be changed by SMBus or auto-loading from EEPROM. 00b: the threshold is set at the middle of forwarding packet 01b: the threshold is set ahead 1-cycle of middle point 10b: the threshold is set ahead 2-cycle of middle point. 11b: the threshold is set ahead 3-cycle of middle point. Reset to 01b.

3 Port Arbitration Mode RW

When set, the round-robin arbitration will stay in the arbitrated port even if the credit is not enough but request is pending. When clear, the round-robin arbitration will always go to the requesting port, which the outgoing credit is enough for the packet queued in the port. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

4 Credit Update Mode RW

When set, the frequency of releasing new credit to the link partner will be all types per update. When clear, the frequency of releasing new credit to the link partner will be type oriented per update. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

5 Ordering on Different

When set, there has ordering rule on packets for different egress port. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. Ordering on Different Tag of Completion Mode RW When set, there has ordering rule between completion packet with different tag. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

7 Non-Post TLP Sotre-

When set, for Non-post TLP store-forward mode is used. Otherwise, Non-post TLP is working under cut-through mode. The default value may be changed by SMBus or auto- loading from EEPROM. Reset to 0b. 13:8 Power Management Control Parameter RW The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 10_0001b.

14 RX Polarity Inversion

The default value may be changed by the status of strapped pin, SMBus or auto-loading from EEPROM. Reset to the status of RXPOLINV_DIS strapped pin.

15 Compliance pattern

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 20:16 C_DRV_LVL_3P5_N OM RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 1_0011b 25:21 C_DRV_LVL_6P0_N OM RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 10_011b 30:26 C_DRV_LVL_HALF _NOM RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 000_10b 31 Reserved RsvdP Not Support.

7.2.44 SWITCH OPERATION MODE – OFFSET 74h (Downstream Port)

BIT FUNCTION TYPE DESCRIPTION 7:0 Reserved RsvdP Not Support. 13:8 Power Management Control Parameter RW The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 10_0001b. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 20:31 Reserved RsvdP Not Support.

7.2.45 XPIP_CSR2 – OFFSET 78h

BIT FUNCTION TYPE DESCRIPTION 15:0 XPIP_CSR2 RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0080h.

7.2.46 PHY PARAMETER 1 – OFFSET 78h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 20:16 C_EMP_POST_GEN1 _3P5_NOM RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 1_0101b. 25:21 C_EMP_POST_GEN2 _3P5_NOM RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 10_101b. 30:26 C_EMP_POST_GEN2 _6P0_NOM RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 111_01b. 31 Reserved RsvdP Not Support.

7.2.47 PHY PARAMETER 2 – OFFSET 7Ch

BIT FUNCTION TYPE DESCRIPTION 3:0 C_TX_PHY_ LATENCY RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 7h. 6:4 C_REC_DETEC_ USEC RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 010b. 7 Reserved RsvdP Not Support.

8 P_CDR_FREQLOOP_

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 1b. 10:9 P_CDR_ THRESHOLD RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 10b. 12:11 P_CDR_FREQLOOP_ GAIN RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 11b. 15:13 Reserved RsvdP Not Support.

16 P_DRV_LVL_MGN_

DELATA_EN RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

17 P_DRV_LVL_NOM_

DELATA_EN RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

18 P_EMP_POST_MGN

_DELATA_EN RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

19 P_EMP_POST_NOM

_DELATA_EN RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 21:20 P_RX_SIGDET_LVL RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 01b. 25:22 P_RX_EQ_1 RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000b. 29:26 P_RX_EQ_2 RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000b.

30 P_TXSWING RO

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 31 Reserved RsvdP Not Support.

7.2.48 XPIP_CSR3 – OFFSET 80h

BIT FUNCTION TYPE DESCRIPTION 31:0 XPIP_CSR3 RW The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 000F_0000h.

7.2.49 XPIP_CSR4 – OFFSET 84h

BIT FUNCTION TYPE DESCRIPTION 31:0 XPIP_CSR4 RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000_0000h.

7.2.50 XPIP_CSR5 – OFFSET 88h

BIT FUNCTION TYPE DESCRIPTION 29:0 XPIP_CSR5 RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 7308_3333h for Upstream port. Reset to 3308_3333h for Downstream ports.

30 DO_CHG_DATA_

RATE_CTRL RO The default value may be changed by SMBus, I2C or auto-loading from EEPROM. Reset to 1b (Upstream Port). Reset to 0b (Downstream Ports).

31 Gen1_Cap_Only RO

The default value may be changed by SMBus, I2C or auto-loading from EEPROM. 0b: GEN2 capability 1b: GEN1 capability Reset to 0b.

7.2.51 TL_CSR0 – OFFSET 8Ch

BIT FUNCTION TYPE DESCRIPTION

0 TX_SOF_FORM RO

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. PM Data Select Register R/W Capability RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 2 Reserved RsvdP Not Support. 3 4K Boundary Check Enable RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 4 Reserved RsvdP Not Support.

5 MW Overpass Disable RW

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

6 Ordering Frozen

Disable the RO ordering rule. The default value may be changed by SMBus or auto-loading from EEPROM Reset to 0b. 7 Reserved RsvdP Not Support. 8:9 DO_CHG_DATA_CN T_SEL RO The trying number for doing change data rate. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 00b.

10 Port Disable RO

Disable this port. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 11 Reserved RsvdP Not Support.

12 Power Saving Enable HWIni

t 0b: power saving disable 1b: power saving enable. 15:13 Reserved RsvdP Not Support. 23:16 XPIP_CSR6 RO XPIP_CSR6 Value. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 79h. 25:24 REV_TS_CTR RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 00b. 29:26 MAC Control Parameter RO The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0h. 30 Reserved RsvdP Not Support.

31 P35_GEN2_MODE RO

The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

7.2.52 PHY PARAMETER 3 – OFFSET 90h

BIT FUNCTION TYPE DESCRIPTION 6:0 PHY Parameter 3 (per lane) RO PHY’s Lane mode. Reset to 000_0000b. 14:7 Reserved RsvdP Not Support. 31:15 PHY Parameter 3 (global) RO PHY’s delta value setting. Reset to 0001h.

7.2.53 PHY PARAMETER 4 - OFFSET 94h

BIT FUNCTION TYPE DESCRIPTION 15:0 PHY TX Margin RO Reset to 116Bh. 23:16 Multilane RXEQ RO Upstream Port only. Reset to 86h for Upstream Port. Reset to 00h for Downstream Ports. 31:24 Reserved RsvdP Not Support.

7.2.54 OPERATION MODE –OFFSET 98h

BIT FUNCTION TYPE DESCRIPTION 15:0 Operation mode RO {7'd0, VC0_NEGO_PENDING, SCAN_MODE, PKG_SEL[1:0], PHY_MODE, DEBUG_MODE, FAST_MODE, IDDQB, SROM_BYPASS}; Reset to 0102h. 20:16 Clock buffer control HwInt RO For Reference clock buffer control. The default value may be changed by the status of strapped pin, SMBus or auto-loading from EEPROM. Bit[20]: Reset to the status of CLKBUF_PD strapped pin. Bit[19:16]: Reset to 7h. Bit[20]: enable or disable reference clock outputs 0b: enable reference clock outputs 1b: disable reference clock outputs Bit[18:16]: enable or disable REFCLKO_P/N[2:0] 0b: disable 1b: enable Bit[19]: reserved 31:21 Reserved RsvdP Not Support.

7.2.55 LTSSM DEBUG CONTROL REGISTER – OFFSET 9Ch

BIT FUNCTION TYPE DESCRIPTION 1:0 Debug Port Select RW Debug port select. Reset to 00b. 5:2 Trigger Sel RW Select trigger point. 0001b: trigger from Detect state 0010b: trigger from Polling state 0011b: trigger from Configuration state 0100b: trigger from L0 state

PI7C9X2G304SV Page 63 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 0101b: trigger from L0s state 0110b: trigger from L1 state 0111b: trigger from L2 state 1000b: trigger from Disable state 1001b: trigger from Hot Reset state 1010b: trigger from Loopback state 1011b: trigger from Recovery state Others: Reserved Reset to 0h

6 Clear RW

When set, it will clear the embedded debug data buffer. Reset to 0b 31:7 Reserved RsvdP Not Support.

7.2.56 LTSSM DEBUG DATA OUTPUT REGSITER – OFFSET A0h

BIT FUNCTION TYPE DESCRIPTION 31:0 Debug Data Output RO It can be accessed by I2C/SMBUS only.

7.2.57 SSID/SSVID CAPABILITY REGISTER – OFFSET B0h

BIT FUNCTION TYPE DESCRIPTION 7:0 SSID/SSVID Capabilities ID RO Read as 0Dh to indicate that these are SSID/SSVID capability registers. 15:8 Next Item Pointer RO Pointer points to the PCI Express capability register. Reset to C0h. 31:16 Reserved RsvdP Not Support.

7.2.58 SUBSYSTEM ID REGISTER – OFFSET B4h

BIT FUNCTION TYPE DESCRIPTION 15:0 SSVID RO It indicates the sub-system vendor id. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000h. 31:16 SSID RO It indicates the sub-system device id. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000h.

7.2.59 GPIO CONTROL REGISTER – OFFSET B8h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 GPIO [0] Input HwInt

State of GPIO [0] pin

1 GPIO [0] Output

0b: GPIO [0] is an input pin 1b: GPIO [0] is an output pin Reset to 0b.

2 GPIO [0] Output

Value of this bit will be output to GPIO [0] pin if GPIO [0] is configured as an output pin. Reset to 0b. 3 Reserved RsvdP Not Support.

4 GPIO [1] Input HwInt

State of GPIO [1] pin.

5 GPIO [1] Output

0b: GPIO [1] is an input pin 1b: GPIO [1] is an output pin Reset to 0b.

6 GPIO [1] Output

Value of this bit will be output to GPIO [1] pin if GPIO [1] is configured as an output pin. Reset to 0b. 7 Reserved RsvdP Not Support.

8 GPIO [2] Input HwInt

State of GPIO [2] pin

9 GPIO [2] Output

0b: GPIO [2] is an input pin 1b: GPIO [2] is an output pin Reset to 0b.

10 GPIO [2] Output

Value of this bit will be output to GPIO [2] pin if GPIO [2] is configured as an output pin. Reset to 0b. 11 Reserved RsvdP Not Support.

12 GPIO [3] Input HwInt

State of GPIO [3] pin.

13 GPIO [3] Output

0b: GPIO [3] is an input pin 1b: GPIO [3] is an output pin Reset to 0b.

14 GPIO [3] Output

Value of this bit will be output to GPIO [3] pin if GPIO [3] is configured as an output pin. Reset to 0b. 15 Reserved RsvdP Not Support.

16 GPIO [4] Input HwInt

State of GPIO [4] pin.

17 GPIO [4] Output

0b: GPIO [4] is an input pin 1b: GPIO [4] is an output pin Reset to 0b.

18 GPIO [4] Output

Value of this bit will be output to GPIO [4] pin if GPIO [4] is configured as an output pin. Reset to 0b. 19 Reserved RsvdP Not Support.

20 GPIO [5] Input HwInt

State of GPIO [5] pin.

21 GPIO [5] Output

0b: GPIO [5] is an input pin 1b: GPIO [5] is an output pin Reset to 0b.

22 GPIO [5] Output

Value of this bit will be output to GPIO [5] pin if GPIO [5] is configured as an output pin. Reset to 0b. 23 Reserved RsvdP Not Support.

24 GPIO [6] Input HwInt

State of GPIO [6] pin.

25 GPIO [6] Output

0b: GPIO [6] is an input pin 1b: GPIO [6] is an output pin Reset to 0b.

26 GPIO [6] Output

Value of this bit will be output to GPIO [6] pin if GPIO [6] is configured as an output pin. Reset to 0b. 27 Reserved RsvdP Not Support.

28 GPIO [7] Input HwInt

State of GPIO [7] pin.

29 GPIO [7] Output

0b: GPIO [7] is an input pin 1b: GPIO [7] is an output pin Reset to 0b.

30 GPIO [7] Output

Value of this bit will be output to GPIO [7] pin if GPIO [7] is configured as an output pin. Reset to 0b. 31 Reserved RsvdP Not Support.

7.2.60 EEPROM CONTROL REGISTER – OFFSET BCh (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 EEPROM Start RW

Starts the EEPROM read or write cycle. Reset to 0b.

1 EEPROM Command RW

Sends the command to the EEPROM. 0b: EEPROM read 1b: EEPROM write Reset to 0b.

2 EEPROM Error Status RO

1b: EEPROM acknowledge was not received during the EEPROM cycle. Reset to 0b.

3 EEPROM Autoload

0b: EEPROM autoload was unsuccessful or is disabled 1b: EEPROM autolad occurred successfully after RESET. Configuration registers were loaded with values in the EEPROM It will be cleared when read at this bit.

4 EEPROM Autoload

0b: EEPROM autoload was unsuccessful or is disabled 1b: EEPROM autoload occurred successfully after PREST. Configuration registers were loaded with values stored in the EEPROM Reset to 0b.

5 EEPROM Autoload

0b: EEPROM autoload enabled 1b: EEPROM autoload disabled Reset to 1b. 7:6 EEPROM Clock Rate RW Determines the frequency of the EEPROM clock, which is derived from the primary clock. 00b: Reserved 01b: PEXCLK / 1024 (PEXCLK is 125MHz) 10b: Reserved 11b: Test Mode Reset to 01b.

7.2.61 EEPROM ADDRESS REGISTER – OFFSET BCh (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 8 Reserved RsvdP Not Support. 15:9 EEPROM Address RW Contains the EEPROM address. Reset to 00h.

7.2.62 EEPROM DATA REGISTER – OFFSET BCh (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 31:16 EEPROM Data RW Contains the data to be written to the EEPROM. After completion of a read cycle, this register will contain the data from the EEPROM. Reset to 0000h.

7.2.63 PCI EXPRESS CAPABILITY REGISTER – OFFSET C0h

BIT FUNCTION TYPE DESCRIPTION 7:0 Enhanced Capabilities ID RO Read as 10h to indicate that these are PCI express enhanced capability registers. 15:8 Next Item Pointer RO Read as 00h. No other ECP registers. 19:16 Capability Version RO Read as 0010b to indicate the device is compliant to Revision .2.0a of PCI Express Base Specifications. 23:20 Device/Port Type RO Indicates the type of PCI Express logical device. Reset to 0101b for Upstream port. Reset to 0110b for Downstream ports.

24 Slot Implemented HwInt

When set, indicates that the PCIe Link associated with this Port is connected to a slot. This field is valid for downstream port of the Switch. The default value may be changed by the status of strapped pin, SMBus or auto-loading from EEPROM. Reset to the status of SLOT_IMP strapped pin. 29:25 Interrupt Message Number RO Read as 0b. No MSI messages are generated in the transparent mode. 31:30 Reserved RsvdP Not Support.

7.2.64 DEVICE CAPABILITIES REGISTER – OFFSET C4h

BIT FUNCTION TYPE DESCRIPTION 2:0 Max_Payload_Size Supported HwInt RO Indicates the maximum payload size that the device can support for TLPs. Each port of the Switch supports 512 bytes max payload size. The default value may be changed by the status of strapped pin, SMBus or auto-loading from EEPROM. Reset to 001b when PL_512B strapped pin is set to 0. Reset to 010b when PL_512B strapped pin is set to 1. 4:3 Phantom Functions Supported RO Indicates the support for use of unclaimed function numbers as Phantom functions. Read as 00b, since the Switch does not act as a requester. Reset to 00b.

5 Extended Tag Field

Indicates the maximum supported size of Tag field as a Requester. Read as 0, since the Switch does not act as a requester. Reset to 0b. 8:6 Endpoint L0s Acceptable Latency RO Acceptable total latency that an Endpoint can withstand due to the transition from L0s state to the L0 state. For Switch, the ASPM software would not check this value. Reset to 000b. 11:9 Endpoint L1 Acceptable Latency RO Acceptable total latency that an Endpoint can withstand due to the transition from L1 state to the L0 state. For Switch, the ASPM software would not check this value. Reset to 000b. 14:12 Reserved RsvdP Not Support.

15 Role_Based Error

When set, indicates that the device implements the functionality originally defined in the Error Reporting ECN. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 1b. 17:16 Reserved RsvdP Not Support.

PI7C9X2G304SV Page 67 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 25:18 Captured Slot Power Limit Value RO It applies to Upstream Port only. In combination with the Slot Power Limit Scale value, specifies the upper limit on power supplied by slot. This value is set by the Set_Slot_Power_Limit message or hardwired to 00h. Reset to 00h. 27:26 Captured Slot Power Limit Scale RO It applies to Upstream Port only. Specifies the scale used for the Slot Power Limit Value. This value is set by the Set_Slot_Power_Limit message or hardwired to 00b. Reset to 00b. 31:28 Reserved RsvdP Not Support.

7.2.65 DEVICE CONTROL REGISTER – OFFSET C8h

BIT FUNCTION TYPE DESCRIPTION

0 Correctable Error

0b: Disable Correctable Error Reporting 1b: Enable Correctable Error Reporting Reset to 0b.

1 Non-Fatal Error

0b: Disable Non-Fatal Error Reporting 1b: Enable Non-Fatal Error Reporting Reset to 0b.

2 Fatal Error Reporting

0b: Disable Fatal Error Reporting 1b: Enable Fatal Error Reporting Reset to 0b.

3 Unsupported Request

0b: Disable Unsupported Request Reporting 1b: Enable Unsupported Request Reporting Reset to 0b.

4 Enable Relaxed

When set, it permits the device to set the Relaxed Ordering bit in the attribute field of transaction. Since the Switch can not either act as a requester or alter the content of packet it forwards, this bit always returns ‘0’ when read. Reset to 0b. 7:5 Max_Payload_Size RW This field sets maximum TLP payload size for the device. Permissible values that can be programmed are indicated by the Max_Payload_Size Supported in the Device Capabilities register. Any value exceeding the Max_Payload_Size Supported written to this register results into clamping to the Max_Payload_Size Supported value. Reset to 000b.

8 Extended Tag Field

Does not apply to PCI Express Switch. Returns ‘0’ when read. Reset to 0b.

9 Phantom Function

Does not apply to PCI Express Switch. Returns ‘0’ when read. Reset to 0b.

10 Auxiliary (AUX)

When set, indicates that a device is enabled to draw AUX power independent of PME AUX power. Reset to 0b.

11 Enable No Snoop RO

When set, it permits to set the No Snoop bit in the attribute field of transaction. Since the Switch can not either act as a requester or alter the content of packet it forwards, this bit always returns ‘0’ when read. Reset to 0b. 14:12 Max_Read_ Request_Size RO This field sets the maximum Read Request size for the device as a Requester. Since the Switch does not generate read request by itself, these bits are hardwired to 000b. Reset to 000b. 15 Reserved RsvdP Not Support.

7.2.66 DEVICE STATUS REGISTER – OFFSET C8h

BIT FUNCTION TYPE DESCRIPTION

16 Correctable Error

Asserted when correctable error is detected. Errors are logged in this register regardless of whether error reporting is enabled or not in the Device Control register. Reset to 0b.

17 Non-Fatal Error

Asserted when non-fatal error is detected. Errors are logged in this register regardless of whether error reporting is enabled or not in the Device Control register. Reset to 0b.

18 Fatal Error Detected RW1C

Asserted when fatal error is detected. Errors are logged in this register regardless of whether error reporting is enabled or not in the Device Control register. Reset to 0b.

19 Unsupported Request

Asserted when unsupported request is detected. Errors are logged in this register regardless of whether error reporting is enabled or not in the Device Control register. Reset to 0b.

20 AUX Power Detected RO

Asserted when the AUX power is detected by the Switch Reset to 1b.

21 Transactions Pending RO

Each port of Switch does not issue Non-posted Requests on its own behalf, so this bit is hardwired to 0b. Reset to 0b. 31:22 Reserved RsvdP Not Support.

7.2.67 LINK CAPABILITIES REGISTER – OFFSET CCh

BIT FUNCTION TYPE DESCRIPTION 3:0 Maximum Link Speed RO Indicates the maximum speed of the Express link. 0001b: 2.5Gb/s 0010b: 5.0Gb/s Otherwise: Reserved Reset to 0010b. 9:4 Maximum Link Width RO Indicates the maximum width of the given PCIe Link. Reset to 00_0001b (x1). 11:10 Active State Power Management (ASPM) Support RO Indicates the level of ASPM supported on the given PCIe Link. Each port of Switch supports L0s and L1 entry. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 11b. 14:12 L0s Exit Latency RO Indicates the L0s exit latency for the given PCIe Link. The length of time this port requires to complete transition from L0s to L0 is in the range of 256ns to less than 512ns. The default value may be changed by SMBus or auto- loading from EEPROM. Reset to 011b. 17:15 L1 Exit Latency RO Indicates the L1 exit latency for the given PCIe Link. The length of time this port requires to complete transition from L1 to L0 is in the range of 16us to less than 32us. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 000b.

18 Clock Power

For upstream port, a value of 1b indicates that component tolerates the removal of any reference clock via CLKREQ#. The default value may be changed by SMBUS or auto- loading from EEPROM. Reset to 1b for Upstream port. Reset to 0b for Downstream ports.

19 Surprise Down

Valid for downstream ports only. Reset to 0b for Upstream port. Reset to 1b for Downstream ports. Data Link Layer Active Reporting Capable RO For a Downstream Port, this bit must be set to 1b if the component supports the optional capability of reporting the DL_Active state of the Data Link Control and Management State Machine. For a hot-plug capable Downstream Port, this bit must be set to 1b. For Upstream Port, this bit must be hardwired to 0b. Reset to 0b for upstream port. Reset to 0b for downstream ports. 21 Link bw notify cap RO Reset to 0b for Upstream port. Reset to 1b for Downstream ports. 23:21 Reserved RsvdP Not Support. 31:24 Port Number RO Indicates the PCIe Port Number for the given PCIe Link. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 00h for Port 0. Reset to 01h for Port 1. Reset to 02h for Port 2.

7.2.68 LINK CONTROL REGISTER – OFFSET D0h

BIT FUNCTION TYPE DESCRIPTION 1:0 Active State Power Management (ASPM) Control RW 00b: ASPM is Disabled 01b: L0s Entry Enabled 10b: L1 Entry Enabled 11b: L0s and L1 Entry Enabled Note that the receiver must be capable of entering L0s even when the field is disabled. Reset to 00b. 2 Reserved RsvdP Not Support.

3 Read Completion

Boundary (RCB) RO Does not apply to PCI Express Switch. Returns ‘0’ when read. Reset to 0b.

4 Link Disable RW

At upstream port, it is not allowed to disable the link, so this bit is hardwired to ‘0’. For downstream ports, it disables the link when this bit is set. Reset to 0b.

5 Retrain Link RW

At upstream port, it is not allowed to retrain the link, so this bit is hardwired to 0b. For downstream ports, it initiates Link Retraining when this bit is set. This bit always returns 0b when read.

6 Common Clock

0b: The components at both ends of a link are operating with asynchronous reference clock 1b: The components at both ends of a link are operating with a distributed common reference clock Reset to 0b.

7 Extended Synch RW

When set, it transmits 4096 FTS ordered sets in the L0s state for entering L0 state and transmits 1024 TS1 ordered sets in the L1 state for entering L0 state. Reset to 0b. 8 Reserved RsvdP Not Support.

9 HW Autonomous

Width Disable RW Reset to 0b.

10 Reserved

For upstream Port is RO and reset to 0b. For downstream Port is RW and Reset to 0b.

11 Reserved

For upstream Port is RO and reset to 0b. For downstream Port is RW and Reset to 0b. 15:12 Reserved RsvdP Not Support.

7.2.69 LINK STATUS REGISTER – OFFSET D0h

BIT FUNCTION TYPE DESCRIPTION 19:16 Link Speed RO Indicate the negotiated speed of the Express link: 0001b: 2.5 Gb/s. 0010b: 5.0 Gb/s. Reset to 0010b. 25:20 Negotiated Link Width RO Indicates the negotiated width of the given PCIe link. 0001b: x1 link Reset to 0001b.

26 Training Error RO

When set, indicates a Link training error occurred. This bit is cleared by hardware upon successful training of the link to the L0 link state. Reset to 0b.

27 Link Training RO

When set, indicates the link training is in progress. Hardware clears this bit once link training is complete. Reset to 0b.

28 Slot Clock

0b: the Switch uses an independent clock irrespective of the presence of a reference on the connector 1b: the Switch uses the same reference clock that the platform provides on the connector The default value may be changed by the status of strapped pin, SMBus or auto-loading from EEPROM. Reset to the status of SLOTCLK strapped pin.

29 Data Link Layer Link

Indicates the status of the Data Link Control and Management State Machine. It returns a 1b to indicate the DL_Active state, 0b otherwise. Reset to 0b. 31:30 Reserved RsvdP Not Support.

7.2.70 SLOT CAPABILITIES REGISTER – OFFSET D4h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 Attention Button

When set, it indicates that an Attention Button is implemented on the chassis for this slot. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

1 Power Controller

When set, it indicates that a Power Controller is implemented for this slot. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b. 2 Reserved RsvdP Not Support.

3 Attention Indicator

When set, it indicates that an Attention Indicator is implemented on the chassis for this slot. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

4 Power Indicator

When set, it indicates that a Power Indicator is implemented on the chassis for this slot. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

5 Hot-Plug Surprise RO

When set, it indicates that a device present in this slot might be removed from the system without any prior notification. The default value may be changed by SMBus or auto- loading from EEPROM. Reset to 0b.

6 Hot-Plug Capable RO

When set, it indicates that this slot is capable of supporting Hot-Plug operation. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0b.

PI7C9X2G304SV Page 71 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 14:7 Slot Power Limit Value RW It applies to Downstream Port only. In combination with the Slot Power Limit Scale value, specifies the upper limit on power supplied by slot. Writes to this register also cause the Port to send the Set_Slot_Power_Limit message. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 00h. 16:15 Slot Power Limit Scale RW It applies to Downstream Port only. Specifies the scale used for the Slot Power Limit Value. Writes to this register also cause the Port to send the Set_Slot_Power_Limit message. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 00b. 18:17 Reserved RsvdP Not Support. 31:19 Physical Slot Number RO It indicates the physical slot number attached to this Port. The default value may be changed by SMBus or auto-loading from EEPROM. Reset to 0000h.

7.2.71 SLOT CONTROL REGISTER – OFFSET D8h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION When set, it enables the generation of Hot-Plug interrupt or wakeup event on an attention button pressed event. Reset to 0b.

1 Power Fault Detected

When set, it enables the generation of Hot-Plug interrupt or wakeup event on a power fault event. Reset to 0b. 2 Reserved RsvdP Not Support.

3 Presence Detect

When set, it enables the generation of Hot-Plug interrupt or wakeup event on a presence detect changed event. Reset to 0b.

4 Command Completed

When set, it enables the generation of Hot-Plug interrupt when the Hot-Plug Controller completes a command. Reset to 0b.

5 Hot-Plug Interrupt

When set, it enables generation of Hot-Plug interrupt on enabled Hot-Plug events. Reset to 0b. 7:6 Attention Indicator Control RW Controls the display of Attention Indicator. 00b: Reserved 01b: On 10b: Blink 11b: Off Writes to this register also cause the Port to send the ATTENTION_INDICATOR_* Messages. Reset to 11b. 9:8 Power Indicator Control RW Controls the display of Power Indicator. 00b: Reserved 01b: On 10b: Blink 11b: Off Writes to this register also cause the Port to send the POWER_INDICATOR_* Messages. Reset to 11b.

10 Power Controller

0b: reset the power state of the slot (Power On) 1b: set the power state of the slot (Power Off) Reset to 0b.

PI7C9X2G304SV Page 72 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 11 Reserved RsvdP Not Support.

12 Data Link Layer State

If the Data Link Layer Link Active capability is implemented, when set to 1b, this field enables software notification when Data Link Layer Link Active field is changed. Reset to 0b. 15:13 Reserved RsvdP Not Support.

7.2.72 SLOT STATUS REGISTER – OFFSET D8h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

16 Attention Button

When set, it indicates the Attention Button is pressed. Reset to 0b.

17 Power Fault Detected RW1C

When set, it indicates a Power Fault is detected. Reset to 0b.

18 MRL Sensor Changed RO

When set, it indicates a MRL Sensor Changed is detected. Reset to 0b.

19 Presence Detect

When set, it indicates a Presence Detect Changed is detected. Reset to 0b.

20 Command Completed RW1C

When set, it indicates the Hot-Plug Controller completes an issued command. Reset to 0b.

21 MRL Sensor State RO

Reflects the status of MRL Sensor. 0b: MRL Closed 1b: MRL Opened Reset to 0b.

22 Presence Detect State HwInt

Indicates the presence of a card in the slot. 0b: Slot Empty 1b: Card Present in slot This register is implemented on all Downstream Ports that implement slots. For Downstream Ports not connected to slots (where the Slot Implemented bit of the PCI Express Capabilities register is 0b), this bit returns 1b. Reset to 0b when PRSNT strapped pin is set to 1. Reset to 1b when PRSNT strapped pin is set to 0. 23 Reserved RsvdP Not Support.

24 Data Link Layer State

This bit is set when the value reported in the Data Link Layer Link Active field of the Link Status register is changed. Reset to 1b. 31:25 Reserved RsvdP Not Support.

7.2.73 DEVICE CAPABILITIES REGISTER 2 – OFFSET E4h

BIT FUNCTION TYPE DESCRIPTION 10:0 Device Capabilities 2 RO Reset to 000h.

11 LTR Mechanism

A value of 1b indicates support for the optional Latency Tolerance Reporting (LTR) mechanism. Reset to 1b. 17:12 Device Capabilities 2 RO Reset to 00h. 19:18 OBFF Supported RO This field indicates if OBFF is supported. Reset to 01b. 31:20 Device Capabilities 2 RO Reset to 000h.

7.2.74 DEVICE CONTROL REGISTER 2 – OFFSET E8h

BIT FUNCTION TYPE DESCRIPTION 9:0 Device Control 2 RO Reset to 000h.

10 LTR Mechanism

Reset to 0b. 12:11 Device Control 2 RO Reset to 00b. 14:13 OBFF Enable RW Enable OBFF Mechanism and select the signaling method. Reset to 00b. 15 Device Control 2 RO Reset to 0b.

7.2.75 DEVIDE STATUS REGISTER 2 – OFFSET E8h

BIT FUNCTION TYPE DESCRIPTION 31:16 Device Status 2 RO Reset to 0000_0000h.

7.2.76 LINK CAPABILITIES REGISTER 2 – OFFSET ECh

BIT FUNCTION TYPE DESCRIPTION 31:0 Link Capabilities 2 RO Reset to 0000_0000h.

7.2.77 LINK CONTROL REGISTER 2 – OFFSET F0h

BIT FUNCTION TYPE DESCRIPTION 3:0 Target Link Speed RWS Reset to 0010b. 4 Enter Compliance RWS Reset to 0b. 5 HW_AutoSpeed_Dis RW Reset to 0b. 6 Select_Deemp RO Reset to 0b for Upstream port. Reset to 1b for Downstream ports. 9:7 Tran_Margin RWS Reset to 000b.

10 Enter Modify

Compliance RWS Reset to 0b. 11 Compliance SOS RWS Reset to 0b. 12 Compliance_Deemp RWS Reset to 0b. 15:13 Reserved RsvdP Not Support.

7.2.78 LINK STATUS REGISTER 2 – OFFSET F0h

BIT FUNCTION TYPE DESCRIPTION

16 Current De-emphasis

Level RO Reset to 0b. 31:17 Link Status 2 RO Reset to 0000h.

7.2.79 SLOT CAPABILITIES REGISTER 2 – OFFSET F4h

BIT FUNCTION TYPE DESCRIPTION 31:0 Slot Capabilities 2 RO Reset to 0000_0000h.

7.2.80 SLOT CONTORL REGISTER 2 – OFFSET F8h

BIT FUNCTION TYPE DESCRIPTION 15:0 Slot Control 2 RO Reset to 0000h.

7.2.81 SLOT STATUS REGISTER 2 – OFFSET F8h

BIT FUNCTION TYPE DESCRIPTION 31:16 Slot Status 2 RO Reset to 0000h.

7.2.82 PCI EXPRESS ADVANCED ERROR REPORTING CAPABILITY REGISTER –

BIT FUNCTION TYPE DESCRIPTION 15:0 Extended Capabilities ID RO Read as 0001h to indicate that these are PCI express extended capability registers for advance error reporting. 19:16 Capability Version RO Read as 1h. Indicates PCI-SIG defined PCI Express capability structure version number. 31:20 Next Capability Offset RO Pointer points to the PCI Express Extended VC capability register. Reset to 140h.

7.2.83 UNCORRECTABLE ERROR STATUS REGISTER – OFFSET 104h

BIT FUNCTION TYPE DESCRIPTION

0 Training Error Status RW1CS

When set, indicates that the Training Error event has occurred. Reset to 0b. 3:1 Reserved RsvdP Not Support.

4 Data Link Protocol

When set, indicates that the Data Link Protocol Error event has occurred. Reset to 0b.

5 Surprise Down Error

When set, indicates that the Surprise Down Error event has occurred. It is valid for downstream ports only. Reset to 0b. 11:6 Reserved RsvdP Not Support.

12 Poisoned TLP Status RW1CS

When set, indicates that a Poisoned TLP has been received or generated. Reset to 0b.

13 Flow Control Protocol

When set, indicates that the Flow Control Protocol Error event has occurred. Reset to 0b.

14 Completion Timeout

When set, indicates that the Completion Timeout event has occurred. Reset to 0b.

15 Completer Abort

When set, indicates that the Completer Abort event has occurred. Reset to 0b.

16 Unexpected

When set, indicates that the Unexpected Completion event has occurred. Reset to 0b.

17 Receiver Overflow

When set, indicates that the Receiver Overflow event has occurred. Reset to 0b.

18 Malformed TLP Status RW1CS

When set, indicates that a Malformed TLP has been received. Reset to 0b.

19 ECRC Error Status RW1CS

When set, indicates that an ECRC Error has been detected. Reset to 0b.

20 Unsupported Request

When set, indicates that an Unsupported Request event has occurred. Reset to 0b.

21 ACS Violation Status RW1CS

When set, indicates that an ACS Violation event has occurred Reset to 0b. 31:21 Reserved RsvdP Not Support.

7.2.84 UNCORRECTABLE ERROR MASK REGISTER – OFFSET 108h

BIT FUNCTION TYPE DESCRIPTION

0 Training Error Mask RWS

When set, the Training Error event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. 3:1 Reserved RsvdP Not Support. When set, the Data Link Protocol Error event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Surprise Down Error event is not logged in the Header Log register and not issued as an Error Message to RC either. It is valid for downstream ports only. Reset to 0b. 11:6 Reserved RsvdP Not Support.

12 Poisoned TLP Mask RWS

When set, an event of Poisoned TLP has been received or generated is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Flow Control Protocol Error event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Completion Timeout event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b.

15 Completer Abort Mask RWS

When set, the Completer Abort event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Unexpected Completion event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Receiver Overflow event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b.

18 Malformed TLP Mask RWS

When set, an event of Malformed TLP has been received is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b.

19 ECRC Error Mask RWS

When set, an event of ECRC Error has been detected is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Unsupported Request event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b.

21 ACS Violation Mask RWS Reset to 0b

31:22 Reserved RsvdP Not Support.

7.2.85 UNCORRECTABLE ERROR SEVERITY REGISTER – OFFSET 10Ch

BIT FUNCTION TYPE DESCRIPTION

0 Training Error

0b: Non-Fatal 1b: Fatal Reset to 1b. 3:1 Reserved RsvdP Not Support.

PI7C9X2G304SV Page 76 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 0b: Non-Fatal 1b: Fatal Reset to 1b. 0b: Non-Fata 1b: Fatal It is valid for downstreams port only. Reset to 1b. 11:6 Reserved RsvdP Not Support.

12 Poisoned TLP Severity RWS

0b: Non-Fatal 1b: Fatal Reset to 0b. 0b: Non-Fatal 1b: Fatal Reset to 1b. 0b: Non-Fatal 1b: Fatal Reset to 0b. 0b: Non-Fatal 1b: Fatal Reset to 0b. 0b: Non-Fatal 1b: Fatal Reset to 0b. 0b: Non-Fatal 1b: Fatal Reset to 1b.

18 Malformed TLP

0b: Non-Fatal 1b: Fatal Reset to 1b.

19 ECRC Error Severity RWS

0b: Non-Fatal 1b: Fatal Reset to 0. 0b: Non-Fatal 1b: Fatal Reset to 0b.

21 ACS violation

0b: Non-Fatal 1b: Fatal Reset to 0b. 31:21 Reserved RsvdP Not Support.

7.2.86 CORRECTABLE ERROR STATUS REGISTER – OFFSET 110 h

BIT FUNCTION TYPE DESCRIPTION

0 Receiver Error Status RW1CS

When set, the Receiver Error event is detected. Reset to 0b. 5:1 Reserved RsvdP Not Support.

6 Bad TLP Status RW1CS

When set, the event of Bad TLP has been received is detected. Reset to 0b.

7 Bad DLLP Status RW1CS

When set, the event of Bad DLLP has been received is detected. Reset to 0b.

8 REPLAY_NUM

When set, the REPLAY_NUM Rollover event is detected. Reset to 0b. 11:9 Reserved RsvdP Not Support.

12 Replay Timer Timeout

When set, the Replay Timer Timeout event is detected. Reset to 0b.

13 Advisory Non-Fatal

When set, the Advisory Non-Fatal Error event is detected. Reset to 0b. 31:14 Reserved RsvdP Not Support.

7.2.87 CORRECTABLE ERROR MASK REGISTER – OFFSET 114 h

BIT FUNCTION TYPE DESCRIPTION

0 Receiver Error Mask RWS

When set, the Receiver Error event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. 5:1 Reserved RsvdP Not Support.

6 Bad TLP Mask RWS

When set, the event of Bad TLP has been received is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b.

7 Bad DLLP Mask RWS

When set, the event of Bad DLLP has been received is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the REPLAY_NUM Rollover event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. 11:9 Reserved RsvdP Not Support. When set, the Replay Timer Timeout event is not logged in the Header Log register and not issued as an Error Message to RC either. Reset to 0b. When set, the Advisory Non-Fatal Error event is not logged in the Header Long register and not issued as an Error Message to RC either. Reset to 1b. 31:14 Reserved RsvdP Not Support.

7.2.88 ADVANCE ERROR CAPABILITIES AND CONTROL REGISTER – OFFSET 118h

BIT FUNCTION TYPE DESCRIPTION 4:0 First Error Pointer ROS It indicates the bit position of the first error reported in the Uncorrectable Error Status register. Reset to 00000b.

5 ECRC Generation

When set, it indicates the Switch has the capability to generate ECRC. Reset to 1b.

6 ECRC Generation

When set, it enables the generation of ECRC when needed. Reset to 0b.

7 ECRC Check Capable RO

When set, it indicates the Switch has the capability to check ECRC. Reset to 1b.

8 ECRC Check Enable RWS

When set, the function of checking ECRC is enabled. Reset to 0b. 31:9 Reserved RsvdP Not Support.

7.2.89 HEADER LOG REGISTER – OFFSET From 11Ch to 128h

BIT FUNCTION TYPE DESCRIPTION 31:0 1st DWORD ROS Hold the 1st DWORD of TLP Header. The Head byte is in big endian. 63:32 2nd DWORD ROS Hold the 2nd DWORD of TLP Header. The Head byte is in big endian. 95:64 3rd DWORD ROS Hold the 3rd DWORD of TLP Header. The Head byte is in big endian. 127:96 4th DWORD ROS Hold the 4th DWORD of TLP Header. The Head byte is in big endian.

7.2.90 PCI EXPRESS VIRTUAL CHANNEL CAPABILITY REGISTER – OFFSET 140h

BIT FUNCTION TYPE DESCRIPTION 15:0 Extended Capabilities ID RO Read as 0002h to indicate that these are PCI express extended capability registers for virtual channel. 19:16 Capability Version RO Read as 1h. Indicates PCI-SIG defined PCI Express capability structure version number. 31:20 Next Capability Offset RO Pointer points to the PCI Express Power Budgeting capability register. Reset to 20Ch.

7.2.91 PORT VC CAPABILITY REGISTER 1 – OFFSET 144h

BIT FUNCTION TYPE DESCRIPTION 2:0 Extended VC Count RO HwInt It indicates the number of extended Virtual Channels in addition to the default VC supported by the Switch. The default value may be changed by the status of strapped pin, or auto-loading from EEPROM. Bit[2:1]: Reset to 00b. Bit[0]: Reset to the status of VC1_EN strapped pin. 3 Reserved RsvdP Not Support. 6:4 Low Priority Extended VC Count RO It indicates the number of extended Virtual Channels in addition to the default VC belonging to the low-priority VC (LPVC) group. The default value may be changed by auto-loading from EEPROM. Reset to 000b. 7 Reserved RsvdP Not Support. 9:8 Reference Clock RO It indicates the reference clock for Virtual Channels that support time-based WRR Port Arbitration. Defined encoding is 00b for 100 ns reference clock. Reset to 00b. 11:10 Port Arbitration Table Entry Size RO Read as 10b to indicate the size of Port Arbitration table entry in the device is 4 bits. Reset to 10b. 31:12 Reserved RsvdP Not Support.

7.2.92 PORT VC CAPABILITY REGISTER 2 – OFFSET 148h

BIT FUNCTION TYPE DESCRIPTION 7:0 VC Arbitration Capability RO It indicates the types of VC Arbitration supported by the device for the LPVC group. This field is valid when LPVC is greater than 0. The Switch supports Hardware fixed arbitration scheme, e.g., Round Robin and Weight Round Robin arbitration with 32 phases in LPVC. Reset to 03h if offset 144h.bit[0]=1. Reset to 00h if offset 144h.bit[0]=0. 23:8 Reserved RsvdP Not Support.

PI7C9X2G304SV Page 79 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 31:24 VC Arbitration Table Offset RO It indicates the location of the VC Arbitration Table as an offset from the base address of the Virtual Channel Capability register in the unit of DQWD (16 bytes). Reset to 03h if offset 144h.bit[0]=1. Reset to 00h if offset 144h.bit[0]=0.

7.2.93 PORT VC CONTROL REGISTER – OFFSET 14Ch

BIT FUNCTION TYPE DESCRIPTION

0 Load VC Arbitration

When set, the programmed VC Arbitration Table is applied to the hardware. This bit always returns 0b when read. Reset to 0b. 3:1 VC Arbitration Select RW This field is used to configure the VC Arbitration by selecting one of the supported VC Arbitration schemes. The valid values for the schemes supported by Switch are 0b and 1b. Other value than these written into this register will be treated as default. Reset to 0b. 15:4 Reserved RsvdP Not Support.

7.2.94 PORT VC STATUS REGISTER – OFFSET 14Ch

BIT FUNCTION TYPE DESCRIPTION

16 VC Arbitration Table

When set, it indicates that any entry of the VC Arbitration Table is written by software. This bit is cleared when hardware finishes loading values stored in the VC Arbitration Table after the bit of “Load VC Arbitration Table” is set. Reset to 0b. 31:17 Reserved RsvdP Not Support.

7.2.95 VC RESOURCE CAPABILITY REGISTER (0) – OFFSET 150h

14 Advanced Packet

When set, it indicates the VC resource only supports transaction optimized for Advanced Packet Switching (AS). Reset to 0b.

15 Reject Snoop

This bit is not applied to PCIe Switch. Reset to 0b. 22:16 Maximum Time Slots RO It indicates the maximum numbers of time slots (minus one) are allocated for Isochronous traffic. The default value may be changed by auto-loading from EEPROM. Reset to 7Fh. 23 Reserved RsvdP Not Support. 31:24 Port Arbitration Table Offset RO It indicates the location of the Port Arbitration Table (n) as an offset from the base address of the Virtual Channel Capability register in the unit of DQWD (16 bytes). Reset to 04h for Port Arbitration Table (0).

7.2.96 VC RESOURCE CONTROL REGISTER (0) – OFFSET 154h

BIT FUNCTION TYPE DESCRIPTION 7:0 TC/VC Map RW This field indicates the TCs that are mapped to the VC resource. Bit locations within this field correspond to TC values. When the bits in this field are set, it means that the corresponding TCs are mapped to the VC resource. The default value may be changed by auto-loading from EEPROM. Reset to FFh. 15:8 Reserved RsvdP Not Support.

16 Load Port Arbitration

When set, the programmed Port Arbitration Table is applied to the hardware. This bit always returns 0b when read. Reset to 0b. 19:17 Port Arbitration Select RW This field is used to configure the Port Arbitration by selecting one of the supported Port Arbitration schemes. The permissible values for the schemes supported by Switch are 000b and 011b at VC0, other value than these written into this register will be treated as default. Reset to 000b. 23:20 Reserved RsvdP Not Support. 26:24 VC ID RO This field assigns a VC ID to the VC resource. Reset to 000b. 30:27 Reserved RsvdP Not Support.

31 VC Enable RW

0b: disables this Virtual Channel 1b: enables this Virtual Channel Reset to 1b.

7.2.97 VC RESOURCE STATUS REGISTER (0) – OFFSET 158h

BIT FUNCTION TYPE DESCRIPTION 15:0 Reserved RsvdP Not Support.

16 Port Arbitration Table

When set, it indicates that any entry of the Port Arbitration Table is written by software. This bit is cleared when hardware finishes loading values stored in the Port Arbitration Table after the bit of “Load Port Arbitration Table” is set. Reset to 0b.

17 VC Negotiation

When set, it indicates that the VC resource is still in the process of negotiation. This bit is cleared after the VC negotiation is complete. Reset to 0b. 31:18 Reserved RsvdP Not Support.

7.2.98 VC RESOURCE CAPABILITY REGISTER (1) – OFFSET 15Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 Port Arbitration Capability RO It indicates the types of Port Arbitration supported by the VC resource. The Switch supports Hardware fixed arbitration scheme, e.g., Round Robin, Weight Round Robin (WRR) arbitration with 128 phases (3~4 enabled ports) and Time-based WRR with 128 phases (3~4 enabled ports). Note that the Time-based WRR is only valid in VC1. Reset to 19h if offset 144h.bit[0]=1. Reset to 00h if offset 144h.bit[0]=0. 13:8 Reserved RsvdP Not Support. When set, it indicates the VC resource only supports transaction optimized for Advanced Packet Switching (AS). Reset to 0b. This bit is not applied to PCIe Switch. Reset to 0b.

PI7C9X2G304SV Page 81 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 22:16 Maximum Time Slots RO It indicates the maximum numbers of time slots (minus one) are allocated for Isochronous traffic. The default value may be changed by auto-loading from EEPROM. Reset to 7Fh if offset 144h.bit[0]=1. Reset to 00h if offset 144h.bit[0]=0. 23 Reserved RsvdP Not Support. 31:24 Port Arbitration Table Offset RO It indicates the location of the Port Arbitration Table (n) as an offset from the base address of the Virtual Channel Capability register in the unit of DQWD (16 bytes). Reset to 08h for Port Arbitration Table (1) if offset 144h.bit[0]=1. Reset to 00h if offset 144h.bit[0]=0.

7.2.99 VC RESOURCE CONTROL REGISTER (1) – OFFSET 160h

BIT FUNCTION TYPE DESCRIPTION 7:0 TC/VC Map RW (Exception for bit0) This field indicates the TCs that are mapped to the VC resource. Bit locations within this field correspond to TC values. When the bits in this field are set, it means that the corresponding TCs are mapped to the VC resource. Bit 0 of this filed is read-only and must be set to “0” for the VC1. The default value may be changed by auto- loading from EEPROM. Reset to 00h. 15:8 Reserved RsvdP Not Support. When set, the programmed Port Arbitration Table is applied to the hardware. This bit always returns 0b when read. Reset to 0b. 19:17 Port Arbitration Select RW This field is used to configure the Port Arbitration by selecting one of the supported Port Arbitration schemes. The permissible values for the schemes supported by Switch are 000b, 011b and 100b at VC1, other value than these written into this register will be treated as default. Reset to 000b. 23:20 Reserved RsvdP Not Support. 26:24 VC ID RW This field assigns a VC ID to the VC resource. Reset to 001b if offset 144h.bit[0]=1. Reset to 000b if offset 144h.bit[0]=0. 30:27 Reserved RsvdP Not Support. 0b: disables this Virtual Channel 1b: enables this Virtual Channel Reset to 0b.

7.2.100 VC RESOURCE STATUS REGISTER (1) – OFFSET 164h

BIT FUNCTION TYPE DESCRIPTION 15:0 Reserved RsvdP Not Support. When set, it indicates that any entry of the Port Arbitration Table is written by software. This bit is cleared when hardware finishes loading values stored in the Port Arbitration Table after the bit of “Load Port Arbitration Table” is set. Reset to 0b. When set, it indicates that the VC resource is still in the process of negotiation. This bit is cleared after the VC negotiation is complete. Reset to 0b. 31:18 Reserved RsvdP Not Support.

7.2.101 VC ARBITRATION TABLE REGISTER – OFFSET 170h

The VC arbitration table is a read -write register array that contains a table for VC arbitration. Each table entry allocates four bits, of which three bits are used to represent VC ID and one bit is reserved. A total of 32 entries are used to construct the VC arbitration table. The layout for this register array is shown below. Table 7-1 Register Array Layout for VC Arbitration 31 - 28 27 - 24 23 - 20 19 - 16 15 - 12 11 - 8 7 - 4 3 - 0 Byte Location Phase [7] Phase [6] Phase [5] Phase [4] Phase [3] Phase [2] Phase [1] Phase [0] 00h Phase [15] Phase [14] Phase [13] Phase [12] Phase [11] Phase [10] Phase [9] Phase [8] 04h Phase [23] Phase [22] Phase [21] Phase [20] Phase [19] Phase [18] Phase [17] Phase [16] 08h Phase [31] Phase [30] Phase [29] Phase [28] Phase [27] Phase [26] Phase [25] Phase [24] 0Ch

7.2.102 PORT ARBITRATION TABLE REGISTER (0) and (1) – OFFSET 180h and 1C0h

The Port arbitration table is a read -write register array that contains a table for Port arbitration. Each table entry allocates two bits to represent Port Number. The table entry size is dependent on the number of enabled ports (refer to bit 10 and 11 of Po rt VC capability register 1). The arbitration table contains 128 entries if three or four ports are to be enabled. The following table shows the register array layout for the size of entry equal to two. Table 7-2 Table Entry Size in 4 Bits 63 - 56 55 - 48 47 - 40 39 - 32 31 - 24 23 - 16 15 - 8 7 - 0 Byte Location Phase [15:14] Phase [13:12] Phase [11:10] Phase [9:8] Phase [7:6] Phase [5:4] Phase [3:2] Phase [1:0] 00h Phase [31:30] Phase [29:28] Phase [27:26] Phase [25:24] Phase [23:22] Phase [21:20] Phase [19:18] Phase [17:16] 08h Phase [47:46] Phase [45:44] Phase [43:42] Phase [41:40] Phase [39:38] Phase [37:36] Phase [35:34] Phase [33:32] 10h Phase [63:62] Phase [61:60] Phase [59:58] Phase [57:56] Phase [55:54] Phase [53:52] Phase [51:50] Phase [49:48] 18h Phase [79:78] Phase [77:76] Phase [75:74] Phase [73:72] Phase [71:70] Phase [69:68] Phase [67:66] Phase [65:64] 20h Phase [95:94] Phase [93:92] Phase [91:90] Phase [89:88] Phase [87:86] Phase [85:84] Phase [83:82] Phase [81:80] 28h Phase [111:110] Phase [109:108] Phase [107:106] Phase [105:104] Phase [103:102] Phase [101:100] Phase [99:98] Phase [97:96] 30h Phase [127:126] Phase [125:124] Phase [123:122] Phase [121:120] Phase [119:118] Phase [117:116] Phase [115:114] Phase [113:112] 38h

7.2.103 PCI EXPRESS POWER BUDGETING CAPABILITY REGISTER – OFFSET 20Ch

BIT FUNCTION TYPE DESCRIPTION 15:0 Extended Capabilities ID RO Read as 0004h to indicate that these are PCI express extended capability registers for power budgeting. 19:16 Capability Version RO Read as 1h. Indicates PCI-SIG defined PCI Express capability structure version number. 31:20 Next Capability Offset RO Pointer points to the PCI Express Extended ACS capability register/LTR capability register. Reset to 230h for Upstream port. Reset to 220h for Downstream ports.

7.2.104 DATA SELECT REGISTER – OFFSET 210h

BIT FUNCTION TYPE DESCRIPTION 7:0 Data Selection RW It indexes the power budgeting data reported through the data register. When 00h, it selects D0 Max power budget When 01h, it selects D0 Sustained power budget Other values would return zero power budgets, which means not supported Reset to 00h. 31:8 Reserved RsvdP Not Support.

7.2.105 POWER BUDGETING DATA REGISTER – OFFSET 214h

BIT FUNCTION TYPE DESCRIPTION 7:0 Base Power RO It specifies the base power value in watts. This value represents the required power budget in the given operation condition. The default value may be changed by auto- loading from EEPROM. Reset to 04h. 9:8 Data Scale RO It specifies the scale to apply to the base power value. Reset to 00b. 12:10 PM Sub State RO It specifies the power management sub state of the given operation condition. It is initialized to the default sub state. Reset to 000b. 14:13 PM State RO It specifies the power management state of the given operation condition. It defaults to the D0 power state. Reset to 00b. 17:15 Type RO It specifies the type of the given operation condition. It defaults to the Maximum power state. Reset to 111b. 20:18 Power Rail RO It specifies the power rail of the given operation condition. Reset to 010b. 31:21 Reserved RsvdP Not Support.

7.2.106 POWER BUDGET CAPABILITY REGISTER – OFFSET 218h

BIT FUNCTION TYPE DESCRIPTION

0 System Allocated RO

When set, it indicates that the power budget for the device is included within the system power budget. The default value may be changed by auto-loading from EEPROM. Reset to 0b. 31:1 Reserved RsvdP Not Support.

7.2.107 ACS EXTENDED CAPABILITY HEADER – OFFSET 220h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 15:0 PCI Express Extended Capability ID RO Read as 000Dh to indicate PCI Express Extended Capability ID for ACS Extended Capability. 19:16 Capability Version RO Must be 1h for this version. 31:20 Next Capability ID RO Pointer points to the PCI Express Extended L1PM Substates Extended capability register. Reset to 240h.

7.2.108 ACS CAPABILITY REGISTER – OFFSET 224h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 ACS Source

Indicated the implements of ACS Source Validation. Reset to 1b.

1 ACS Translation

Indicated the implements of ACS Translation Blocking. Reset to 1b.

2 ACS P2P Request

Indicated the implements of ACS P2P Request Redirect. Reset to 1b.

3 ACS P2P Completion

Indicated the implements of ACS P2P Completion Redirect. Reset to 1b.

4 ACS Upstream

Indicated the implements of ACS Upstream Forwarding. Reset to 1b.

5 ACS P2P Egress

Indicated the implements of ACS P2P Egress control. Reset to 1b.

6 ACS Direct Translated

Indicated the implements of ACS Direct Translated P2P. Reset to 1b. 7 Reserved RsvdP Not Support. 15:8 Egress Control Vector Size RO Encodings 01h –FFh directly indicate the number of applicable bits in the Egress Control Vector. Reset to 08h.

16 ACS Source

Enable the source validation. Reset to 0b.

17 ACS Translation

Enable ACS Translation Blocking. Reset to 0b.

18 ACS P2P Request

Enable ACS P2P Request Redirect. Reset to 0b.

19 ACS P2P Completion

Enable ACS P2P Completion Redirect. Reset to 0b.

20 ACS Upstream

Enable ACS Upstream Forwarding. Reset to 0b.

21 ACS P2P Egress

Enable ACS P2P Egress control. Reset to 0b.

22 ACS Direct Translated

Enable ACS Direct Translated P2P. Reset to 0b. 31:23 Reserved RsvdP Not Support.

7.2.109 EGRESS CONTROL VECTOR – OFFSET 228h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 7:0 Egress Control Vector RW When a given bit is set, peer-to-peer requests targeting the associated Port are blocked or redirected. Reset to 00h. 31:8 Reserved RsvdP Not Support.

7.2.110 LTR EXTENDED CAPABILITY HEADER – OFFSET 230h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 15:0 PCI Express Extended Capability ID RO Read as 0018h to indicate PCI Express Extended Capability ID for LTR Extended Capability. 19:16 Capability Version RO Must be 1h for this version. 31:20 Next Capability ID RO Pointer points to the PCI Express Extended L1PM Substates Extended capability register. Reset to 240h.

7.2.111 MAX SNOOP LATENCY REGISTER – OFFSET 234h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 9:0 Max Snoop Latency Value RW Specifies the maximum snoop latency that a device is permitted to request Reset to 000h. 12:10 Max Snoop Latency Scale RW This register provides a scale for the value contained within the Maximum Snoop Latency Value field Reset to 000b 15:13 Reserved RsvdP Not Support.

7.2.112 MAX NO-SNOOP LATENCY REGISTER – OFFSET 234h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 25:16 Max No-Snoop Latency Value RW Specifies the maximum no-snoop latency that a device is permitted to request Reset to 000h. 28:26 Max No-Snoop Latency Scale RW This register provides a scale for the value contained within the Maximum No-Snoop Latency Value field Reset to 000b. 31:29 Reserved RsvdP Not Support.

7.2.113 LI PM SUBSTATES EXTENDED CAPABILITY HEADER – OFFSET 240h

BIT FUNCTION TYPE DESCRIPTION 15:0 PCI Express Extended Capability ID RO Read as 001Eh to indicate PCI Express Extended Capability ID for L1 PM Substates Extended Capability. Reset to 001Eh. 19:16 Capability Version RO Must be 1h for this version. 31:20 Next Capability ID RO Pointer points to the PCI Express Extended PTM Extended capability register/DPC Extended capability register. Reset to 260h for Upstream port. Reset to 250h for Downstream ports.

7.2.114 L1 PM SUBSTATES CAPABILITY REGISTER – OFFSET 244h

BIT FUNCTION TYPE DESCRIPTION 0 Reserved RsvdP Not Support. 1 PCI-PM L1.1 Supported RO When set this bit indicates that PCI-PM L1.1 is supported and must be set by all ports implementing L1 OM Substates. The default value may be changed by auto-loading from EEPROM. Reset to 1b.

PI7C9X2G304SV Page 86 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 2 Reserved RsvdP Not Support. 3 ASPM L1.1 Supported RO When set this bit indicates that ASPM L1.1 is supported. The default value may be changed by SMBus, I2C or auto-loading from EEPROM. Reset to 0b.

4 L1 PM Substates

When set this bit indicates that this port supports L1 PM Substates. The default value may be changed by auto-loading from EEPROM. Reset to 1b. 31:5 Reserved RsvdP Not Support.

7.2.115 L1 PM SUBSTATES CONTROL 1 REGISTER – OFFSET 248h

BIT FUNCTION TYPE DESCRIPTION 0 Reserved RsvdP Not Support. 1 PCI-PM L1.1 Enable RW When set this bit enables PCI-PM L1.1. Required for both upstream and downstream ports. Reset to 0b. 2 Reserved RsvdP Not Support. 3 ASPM L1.1 Enable RW When set this bit enables ASPM L1.1. Required for both upstream and downstream ports. Reset to 0b. 31:4 Reserved RsvdP Not Support.

7.2.116 L1 PM SUBSTATES CONTROL 2 REGISTER – OFFSET 24Ch

BIT FUNCTION TYPE DESCRIPTION 31:0 Reserved RO Reset to 0000_0000h.

7.2.117 DPC EXTENDED CAPABILITY HEADER – OFFSET 250h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 15:0 PCI Express Extended Capability ID RO Read as 001Dh to indicate PCI Express Extended Capability ID for DPC Extended Capability. Reset to 001Dh. 19:16 Capability Version RO Must be 1h for this version. 31:20 Next Capability ID RO Read as 000h. No other ECP registers.

7.2.118 DPC CAPABILITY REGISTER – OFFSET 254h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 4:0 DPC Interrupt Message Number RO This field indicates which MSI vector is used for the interrupt message generated in association with the DPC Capability structure. Reset to 0_0001b. 15:5 Reserved RsvdP Not Support.

7.2.119 DPC CONTROL REGISTER – OFFSET 254h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 17:16 DPC Trigger Enable RW This field enables DPC and controls the conditions that cause DPC to be triggered. 00b… DPC is disabled 01b… DPC is enabled and is triggered when the Downstream port detects and unmasked uncorrectable error or when the Downstream port receives an ERR_FATAL message. 10b… DPC is enabled and is triggered when the Downstream port detects an unmasked uncorrectable error or when the Downstream port receives an ERR_NONFATAL or ERR_FATAL message 11b… Reserved Reset to 00b.

18 DPC Completion

This bit controls the Completion Status for Completions formed during DPC. 0b: Completer Abort (CA) Completion Status 1b: Unsupported Request (UR) Completion Status Reset to 0b.

19 DPC Interrupt Enable RW

When set, this bit enables the generation of an interrupt to indicate that DPC has been triggered. Reset to 0b.

20 DPC ERR_COR

When set, this bit enables the sending of an ERR_COR message to indicate that DPC has been triggered. Reset to 0b. 31:21 Reserved RsvdP Not Support.

7.2.120 DPC STATUS REGISTER – OFFSET 258h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 DPC Trigger Status RW1C

When set, this bit indicates that DPC has been triggered. Reset to 0b. 2:1 DPC Trigger Reason RW1C This field indicates why DPC has been triggered. 00b… DPC was triggered due to an unmasked uncorrectable error 01b… DPC was triggered due to receiving an ERR_NONFATAL 10b… DPC was triggered due to receiving an ERR_FATAL 11b… Reserved Reset to 2’b00.

3 DPC Interrupt Status RW1C

This bit is set if DPC is triggered while the DPC interrupt Enable bit is set. Reset to 0b. 15:4 Reserved RsvdP Not Support.

7.2.121 DPC ERROR SOURCE ID REGISTER – OFFSET 258h (Downstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 31:16 DPC Error Source ID RO When the DPC Trigger Reason field indicates that DPC was triggered due to the reception of an ERR_NONFATAL or ERR_FATAL, this register contains the Requester ID of the received message. Otherwise, the value of this register is undefined. Reset to 0000h.

7.2.122 PTM EXTENDED CAPABILITY HEADER REGISTER – OFFSET 260h (Upstream

Port Only) BIT FUNCTION TYPE DESCRIPTION 15:0 PCI Express Extended Capability ID RO Read as 001Fh to indicate PCI Express Extended Capability ID for PTM Extended Capability. 19:16 Capability Version RO Must be 1h for this version. 31:20 Next Capability ID RO Read as 000h. No other ECP registers.

7.2.123 PTM CAPABILITY REGISTER – OFFSET 264h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 PTM Requester

Capable RO Read as 1b to indicate the switch implement the PTM Requester role.

1 PTM Responder

Capable RO Read as 1b to indicate the switch implement the PTM Responder role. 2 PTM Root Capable RO Read as 1b to indicate the switch implement a PTM Time Source Role and are capable of serving as the PTM Root. 7:3 Reserved RsvdP Not Support. 15:8 Local Clock Granularity RO Indicates the period of this Time Source’s local clock in ns. Reset to 00h. 31:16 Reserved RsvdP Not Support.

7.2.124 PTM CONTROL REGISTER – OFFSET 268h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION

0 PTM Enable RW

When set, this function is permitted to participate in the PTM mechanism according to its selected role. Reset to 0b.

1 Root Select RW

When set, if the PTM Enable bit is also set, this Time Source is the PTM Root. Reset to 0b. 7:2 Reserved RsvdP Not Support. 15:8 Effective Granularity RW This field provides information relating to the expected accuracy of the PTM clock, but doesn not otherwise affect the PTM mechanism. Reset to 00h. 31:16 Reserved RsvdP Not Support.

7.2.125 MISC CONTROL 0 REGISTER – OFFSET 300h

BIT FUNCTION TYPE DESCRIPTION 19:0 CLKREQ_L Wait Time RW Once entering L1.1 power state, the port will deassert CLKREQ_L immediately. However, CLKREQ_L signal is an open-drain wire-or signal with the link partner. If the link partner does not deassert CLKREQ_L for a certain period of time, which is defined by CLKREQ_L Wait Time, the port will assert CLKREQ_L again to resume back to L1 state. The CLKREQ_L wait time decides how long the switch will wait for CLKREQ_L being deasserted by the link partner. The unit is “10 ns”. Reset to 0_0FFFh. It is about 40 us. 31:20 Reserved RsvdP Not Support.

7.2.126 MISC CONTROL 1 REGISTER – OFFSET 304h

BIT FUNCTION TYPE DESCRIPTION 15:0 PM_L1.1 Delay Time RW It is used to decide when the port will enter into PM L1.1 state from L1 state. If the value of PM L1.1 delay time is smaller, the power saving is much effective, but it takes longer time to recover from low power state. If the timer delay value is larger, the power saving is not much effective, but it recovers from low power state to normal power state quicker. The smallest value for PM L1.1 Delay is 0001h, which is equivalent to 4 ns. Reset to 01FFh. 31:16 ASPM_L1.1 Delay Time RW It is used to decide when the port will enter into ASPM L1.1 state from L1 state. If the value of ASPM L1.1 delay time is smaller, the power saving is much effective, but it takes longer time to recover from low power state. If the timer delay value is larger, the power saving is not much effective, but it recovers from low power state to normal power state quicker. The smallest value for ASPM L1.1 Delay is 0001h, which is equivalent to 4ns. Reset to 01FFh.

7.2.127 MISC CONTROL 2 REGISTER – OFFSET 308h

BIT FUNCTION TYPE DESCRIPTION 31:0 Misc Control 2 RW Reset to 0.

7.2.128 MISC CONTROL 3 REGISTER – OFFSET 30Ch

BIT FUNCTION TYPE DESCRIPTION 31:0 Misc Control 3 RW Reset to 0.

7.2.129 MISC CONTROL 4 REGISTER – OFFSET 310h

BIT FUNCTION TYPE DESCRIPTION 31:0 Misc Contro 4 RW Reset to 000F_FFFFh.

7.2.130 PHY/DLL/TL ERROR COUNTER – OFFSET 318h

BIT FUNCTION TYPE DESCRIPTION 15:0 PHY/DLL/TL Error Counter RO Indicates the error number. Reset to 00h.

16 CPL Available Credit

When set, the CPL available credit error is detected. Reset to 0b.

17 NP Available Credit

When set, the NP available credit error is detected. Reset to 0b.

18 Post Available Credit

When set, the Post available credit error is detected. Reset to 0b. 23:19 Reserved RsvdP Not Support.

PI7C9X2G304SV Page 90 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 28:24 PHY/DLL/TL Error Source Select RW 0_0000b: training error 0_0001b: uc_sts error 0_0011b: acs error 0_0100b: rx error 0_0101b: replay rollover error 0_0110b: replay timerout error 0_0111b: cpl available credit error 0_1000b: np available credit error 0_1001b: post available credit error 0_1010b: rx nack 0_1011b: rx nack 0_1100b: rx recovery 0_1101b: tx recovery Others: reserved Reset to 0_0000b. 29 Reserved RsvdP Not Support.

30 Error Counter Clear RW

When set, PHY/DLL/TL Error counter is clear. When read, will return ‘1’ always. Reset to 0b.

31 Enable Error Counter RW

When set, it will enable PHY/DLL/TL Error counter. Reset to 0b.

7.2.131 PORT PHYSICAL LAYER COMMAND AND STATUS REGISTER – OFFSET 320h

BIT FUNCTION TYPE DESCRIPTION

0 PORT0_Loopback_

CMD RW Test used only. Reset to 0b.

1 PORT0_Scramble_

Disable_CMD RW Test used only. Reset to 0b.

2 PORT0_Compliance_

Receive RW Test used only. Reset to 0b.

3 PORT0_

LOOPBACK_ST_I RW Test used only. Reset to 0b. 4 PORT0_Rate_Ctrl RW Test used only. Reset to 0b.

5 PORT0_Deemphasis_

Ctrl RW Test used only. Reset to 0b.

6 PORT0_Compliance_

Mode RW Test used only. Reset to 0b. 7 Reserved RsvdP Not Support.

8 PORT1_Loopback_

CMD RW Test used only. Reset to 0b.

9 PORT1_Scramble_

Disable_CMD RW Test used only. Reset to 0b.

10 PORT1_Compliance_

Receive RW Test used only. Reset to 0b.

11 PORT1_

LOOPBACK_ST_I RW Test used only. Reset to 0b. 12 PORT1_Rate_Ctrl RW Test used only. Reset to 0b.

13 PORT1_Deemphasis_

Ctrl RW Test used only. Reset to 0b.

14 PORT1_Compliance_

Mode RW Test used only. Reset to 0b. 15 Reserved RsvdP Not Support.

16 PORT2_Loopback_

CMD RW Test used only. Reset to 0b.

17 PORT2_Scramble_

Disable_CMD RW Test used only. Reset to 0b.

18 PORT2_Compliance_

Receive RW Test used only. Reset to 0b.

19 PORT2_

LOOPBACK_ST_I RW Test used only. Reset to 0b.

PI7C9X2G304SV Page 91 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV BIT FUNCTION TYPE DESCRIPTION 20 PORT2_Rate_Ctrl RW Test used only. Reset to 0b.

21 PORT2_Deemphasis_

Ctrl RW Test used only. Reset to 0b.

22 PORT2_Compliance_

Mode RW Test used only. Reset to 0b. 31:23 Reserved RsvdP Not Support.

7.2.132 PORT DISABLE/QUIET/TEST PATTERN RATE REGISTER – OFFSET 324h

BIT FUNCTION TYPE DESCRIPTION 2:0 Port Disable RW 0b: Enable Link Training operation 1b: LTSSM remains in the Detect.Quiet state. Bit[0]: for Port 0 Bit[1]: for Port 1 Bit[2]: for Port 2 Reset to 000b. 7:3 Reserved RsvdP Not Support. 10:8 Port Quiet/Test Pattern Rate RW 0b: LTSSM is allowed to exit the Detect.Quiet state 1b: LTSSM remains in the Detect.Quiet state Bit[8]: for Port 0 Bit[9]: for Port 1 Bit[10]: for Port 2 Reset to 000b. 15:11 Reserved RsvdP Not Support. 18:16 Port Pattern Rate RW Test used only. Bit[16]: for Port 0 Bit[17]: for Port 1 Bit[18]: for Port 2 Reset to 000b. 31:19 Reserved RsvdP Not Support.

7.2.133 CSR_LED0 – OFFSET 328h

BIT FUNCTION TYPE DESCRIPTION 7:0 LED_CSR00 RW Reset to 00h. 8 LED_CSR01 RW Reset to 0b. 31:9 Reserved RsvdP Not Support.

7.2.134 CSR_LED1 – OFFSET 32Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 LED_CSR10 RW Reset to 00h. 15:8 LED_CSR11 RW Reset to 00h. 23:16 LED_CSR12 RW Reset to 00h. 31:24 LED_CSR13 RW Reset to 00h.

7.2.135 LTSSM_CSR – OFFSET 33Ch

BIT FUNCTION TYPE DESCRIPTION 7:0 LTSSM_CSR RO The default value may be changed by auto-loading from EEPROM. Reset to 04h. 31:8 Reserved RsvdP Not Support.

7.2.136 MAC_CSR – OFFSET 340h

BIT FUNCTION TYPE DESCRIPTION MAC_CSR RO The default value may be changed by auto-loading from EEPROM. Bit[4]: Adaptive ACK Policy Bit[5]: Fix_Disable_Detect Reset to 04h. 31:16 Reserved RsvdP Not Support.

7.2.137 TL_CSR1 – OFFSET 344h

BIT FUNCTION TYPE DESCRIPTION 7:0 TL_CSR1 RW Reset to 03h. 31:8 Reserved RsvdP Not Support.

7.2.138 DEBUGOUT CONTROL – OFFSET 348h (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 4:0 Debug Mode Select RW Debug mode select. Selects a signal group for probing the current internal status. For example, “0” represents LTSSM signal group. As to other values, please inquire internal team for further information, 7:5 Debug Port_Select RW Selects a port number for monitoring at a given signal group. 8 Debug Output Start RW Start to capture debug output data. 31:9 Reserved RsvdP Not Support.

7.2.139 DEBUGOUT DATA – OFFSET 34Ch (Upstream Port Only)

BIT FUNCTION TYPE DESCRIPTION 31:0 Debug Output Data RO Content of the debug output data.

8 CLOCK SCHEME

The built-in HCSL integrated reference clock buffer of the PI7C9X2G304SV supports three reference clock outputs. It can be enabled and disabled by strapping the CLKBUF_PD pin. When CLKBUF_PD pin is asserted low, the integrated reference clock buffer is enabled. The integrated reference clock buffer distributes a single 100MHz reference clock input to three reference clock output pairs, REFCLKO _P[2:0] and REFCLKO_N[2:0]. One of the integrated reference clock buffer output pairs of the Switch can be connected to the Switch through REFCLKP/N pins, and the other two integrated reference clock buffer outputs can be used by downstream devices. Specified reference clock output pairs can be disable d through the Clock Buffer Control bits in the Operation Mode Register (offset 98h.bit[23:16]) via either I2C, SMBUS or EEPROM. The integrated reference clock buffer requires an external 100MHz differential clock input pair through REFCLKI _P and REFCLKI_N pins as shown in Table 5-1. Table 8-1 AC Switching and DC Electrical Characteristics for REFCLKIP/N and REFCLKOP/N[2:0] Symbol Parameters Min. Typ. Max. Unit Note FIN Reference Clock Frequency 100 MHz Trise/ Tfall Rise and Fall Time in 20-80% 175 700 ps 2 ΔTrise/ ΔTfall Rise and Fall Time Variation 125 ps 2 Tpd Propagation Delay 2.5 6.5 ns VHIGH Voltage High including overshoot 660 1150 mV 2 VLOW Voltage Low including undershoot -300 VHIGH-0.5V mV 2 Vcross Absolute crossing point voltage 250 550 mV 2 Vswing Voltage including overshoot 300 1800 mV 2, 4 TDC Duty Cycle 45 55 % 3 Note: 1. Test configuration is Rs=33.2Ω and 2pF. 2. Measurement taken from Single Ended waveform. 3. Measurement taken from Differential waveform. 4. If the reference clock input is HCSL type, it should use DC coupling; if not in HCSL protocol (ex: LVPECL, LVDS , etc), it should be AC coupling, and refer to application note to add application circuit to rebuild dc bias. If rebuild dc bias for the best 400mV, there is no limit on the Vswing. However, there have two exceptions can be accepted: a. If input is LVPECL, use ac-coupling and no rebuild dc bias, the min Vswing is 550mV (single ended). b. If input is LVDS with 100 ohm cross at the inputs and use dc-coupling, the min Vswing is 250mV (single ended). When CLKBUF_PD pin is asserted high, the clock buffer is disabled. PI7C9X2G304SV requires an external 100MHz different clock input pair through REFCLKP/N Pins as shown in Table 8-2. Table 8-2 AC Switching and DC Electrical Characteristics for REFCLKP/N Symbol Parameters Min. Typ. Max. Unit Note FIN Reference Clock Frequency 100 MHz 1, 2 Aj Accuracy -300 +300 ppm 3 TREFCLK-HF-RMS > 1.5 MHz to Nyquist RMS jitter after applying PCIe filter function 3.1 ps RMS 3 TREFCLK-LF-RMS 10 kHz - 1.5 MHz RMS jitter 3.0 ps RMS 3 SSC freq Spread Spectrum Clock frequency 30 33 kHz 3 Trise/ Tfall Rise and Fall Time in 20-80% 175 700 ps 2 ΔTrise/ ΔTfall Rise and Fall Time Variation 125 ps 2 Tpd Propagation Delay 2.5 6.5 ns VHIGH Voltage High including 0.8 V 2

PI7C9X2G304SV Page 94 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Symbol Parameters Min. Typ. Max. Unit Note overshoot VLOW Voltage Low including undershoot 800 mV 2 Vswing Voltage including overshoot 300 mV 2 TDC Duty Cycle 45 55 % 3 Note: 1. Does not include ±300ppm. Only certain clock frequencies will produce valid PCI Express data. 2. Measurement taken from Single-end waveform. 3. Measurement taken from Differential waveform. 4. As PCIe PHY accept CML type reference clock source and will rebuild command mode voltage by itself, it needs add ac-coupling. When implement L1.1 function, t he connection of REFCLKO _P[2:0] and REFCLKO _N[2:0] to the REFCLKP/N pins of PI7C9X2G304SV and the reference clock input of downstream-port devices have to follow the table shown below. Table 8-3 Connection Map for REFCLKO_P/N[2:0] Reference Clock Source Pins REFCLKOP [0] REFCLKON [0] REFCLKO_P[1] REFCLKO_N[1] REFCLKO_P[2] REFCLKO_N[2] Reference Clock Destination Pins REFCLKP REFCLKN Downstream port-1 device Downstream port-2 device The REFCLK O_P/N[2:0] is not only enabled or disabled by a global control signal CLKBUF_PD, but also controlled by CLKREQ_L[2:0] pins and internal downstream -port device clock status individually based on L1 PM Substate rule. The output control signals for REFCLKO_P/N[2:0] are mapped as the following table. Table 8-4 Output Control for REFCLKO_P/N[2:0] Reference Clock Source Pins REFCLKOP [0] REFCLKON [0] REFCLKO_P[1] REFCLKO_N[1] REFCLKO_P[2] REFCLKO_N[2] Clock Request Control Pins CLKREQ_L[0] CLKREQ_L[1] CLKREQ_L[2] The CLKREQ_L[0] is an upstream control signal that should be connected from the switch output with external pull -up to the CLKREQ_L pin on the host chip (Root Complex). The switch combines the CLKREQ_L[ 2:1] and drives the resulting signal out on the CLKREQ_L[0]. When endpoints do not have any packets to transmit, the switch and endpoints will not drive CLKREQ_L[ 2:1], CLKREQ_L[ 2:1] will be high due to external pull -up resistor and the reference clock REFCLKOP/N[2:1] for down ports will stop. Then, the switch does not drive the CLKREQ_L[0] low on its upstream port. If the Root Complex does not have any packets requiring transmission, it does not drive the CLKREQ_L[0] either. In this case, the CLKREQ_L[0] will be high due to external pull -up resistor and the reference clock REFCLKO/P[0] for the upstream port will stop.

PI7C9X2G304SV Page 95 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV 9 IEEE 1149.1 COMPATIBLE JTAG CONTROLLER An IEEE 1149.1 compatible Test Access Port (TAP) controller and associated TAP pins are provided to support boundary scan in PI7C9X2G304SV 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.

9.1 INSTRUCTION REGISTER

The IEEE 1149.1 Test Logic consists of a TAP controller, an instruction register, and a group of test data registers includin g 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. PI7C9X2G304SV implements a 5-bit Instruction register to control the operation of the JTAG logic. The defined instruction codes are shown in the following table . Those bit combinations that are not listed are equivalent to the BYPASS (11111) instruction. Table 9-1 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 PHY_TEST_SIG 01001 Private Private MEM_BIST 01010 Memory BIST Memory BIST test

9.2 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 PI7C9X2G304SV.

9.3 DEVICE ID REGISTER

This register identifies Pericom as the manufacturer of the device and details the part number and revision number for the device. Table 9-2 JTAG Device ID Register Bit Type Value Description 31-28 RO 0001 Version number 27-12 RO 0000010100001000 Last 4 digits (hex) of the die part number 11-1 RO 01000111111 Pericom identifier assigned by JEDEC

0 RO 1 Fixed bit equal to 1’b1

9.4 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 PI7C9X2G304SV 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.

9.5 JTAG BOUNDARY SCAN REGISTER ORDER

Table 9-3 JTAG Boundary Scan Register Definition Boundary Scan Register Number Pin Name Ball Location Type Tri-state Control Cell

0 DWNRST_L[1] 5 Output2

1 DWNRST_L[2] 6 Output2

2 Internal

3 TEST1 9 Input

4 PERST_L 10 Input

5 TEST2 16 Input

6 TEST3 17 Birdir 12

7 VC1_EN 18 Birdir 12

8 PRSNT[1] 19 Birdir 12

9 PRSNT[2] 20 Birdir 12

10 Internal

11 PORTSTATUS_L1.1_SEL 22 Birdir 12

12 Control

13 RXPOLINV_DIS 24 Birdir 12

14 TEST5 25 Birdir 12

15 SMBCLK 26 Birdir 12

16 SMBDATA 27 Birdir 12

17 PWR_SAV 28 Birdir 12

18 SLOTCLK 33 Birdir 12

19 GPIO[0] 36 Birdir 20

20 Control

21 GPIO[1] 35 Birdir 22

22 Control

23 GPIO[2] 37 Birdir 24

24 Control

25 GPIO[3] 38 Birdir 26

26 Control

27 GPIO[4] 39 Birdir 28

28 Control

29 GPIO[5] 42 Birdir 30

30 Control

31 GPIO[6] 43 Birdir 32

32 Control

33 GPIO[7] 44 Birdir 34

34 Control

35 SLOT_IMP[1] 45 Birdir 45

36 SLOT_IMP[2] 46 Birdir 45

37 Internal

38 Internal

39 TEST6 51 Birdir 45

40 Internal

41 PL_512B 53 Birdir 45

42 SMBUS_EN 54 Birdir 45

43 Internal

PI7C9X2G304SV Page 97 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Boundary Scan Register Number Pin Name Ball Location Type Tri-state Control Cell

44 Internal

45 Control

46 Internal

47 CLKBUF_PD 60 Birdir 45

48 CLKREQ_L[0] / PORTSTATUS[0] 67 Birdir 49

49 Control

50 CLKREQ_L[1] / PORTSTATUS[1] 68 Birdir 51

51 Control

52 CLKREQ_L[2] / PORTSTATUS[2] 69 Birdir 53

53 Control

54 EECLK 70 Output2

55 EEPD 71 Birdir 56

56 Control

10 POWER MANAGEMENT

The PI7C9X2G304SV supports D0, D1, D2, D3-hot, and D3-cold Power States. The PCI Express Physical Link Layer of the PI7C9X2G304SV device supports the PCI Express Link Power Management with L0, L0s, L1, L2/L3 ready and L3 Power States. PI7C9X2G 304SV also supports ASPM (Active State Power Management) to facilitate the link power saving. In addition, PCI-PM and ASPM L1.1 of L1 PM Substate is supported to reduce power consumption further. In order to reduce further power consumption of high -speed circuit in L1 power state, the switch follows PCI-SIG ECN of L1 PM Substates with CLKREQ to implement L1.1 power sub -state for each port of packet switch. When the link is already put into L1 state, it can enter L1.1 sub -state by asserting CLKREQ sideband signal. In L1.1 sub -state, the PLL circuit and receiver buffer are turned off to lower idle power dramatically for that link of associated port. Once CLKREQ de -assertion is detected, the link is recovered from L1.1 sub-state to L1 state and the previously shut-down circuit is resumed. The PI7C9X2G 304SV requires that all lanes and ports enter L1.1 for power -saving to be effective. If any one of lanes or ports is not in L1.1 (such as an empty downstream port or the port connected to device not supporting L1.1 ), the PLL, which is shared by all lanes or ports, cannot be turned off. As a result, the core power would not be reduced because of internal clock kept running. In such a scenario, it suggests to put that port in L1 state instead of L1.1.

11 POWER SEQUENCE

As long as PERST# is active, all PCI Express functions are held in reset. The main supplies ramp up to their specifie d levels (3.3V). Sometime during this stabilization time, the REFCLK starts and stabilizes. After there has been time (100 ms) for the power and clock to become stable, PERST# is deasserted high and the PCI Express functions can start up. It is recommended to power up the I/O voltage (3.3V) first and then the core voltage (1.0V) or power up I/O voltage and core voltage simultaneously for both Aux and Main power rails. Figure 11-1 Initial Power-Up Sequence Power-down sequence is the reverse of power-up sequence.

12 ELECTRICAL AND TIMING SPECIFICATIONS

12.1 ABSOLUTE MAXIMUM RATINGS

Table 12-1 Absolute Maximum Ratings (Above which the useful life may be impaired. For user guidelines, not tested.) Item Absolute Max. Rating Storage Temperature (Tstore) -65oC to 150oC Junction Temperature (Tj) 125 oC Digital core and analog supply voltage to ground potential (VDDC , AVDD and VDDCAUX) -0.3V to 1.5V Digital I/O and analog high supply voltage to ground potential (VDDR , CVDDR, AVDDH and VAUX) -0.3V to 4.0V DC input voltage for Digital I/O signals -0.3V to 4.0V ESD Rating Human Body Model (JEDEC Class 2) Charge Device Mode (JEDEC Class 2) 2 kV 200V 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.

12.2 DC SPECIFICATIONS

Table 12-2 DC Electrical Characteristics Symbol Description Min. Typ. Max. Unit VDDC1 Digital Core Power 0.95 1.0 1.1 V VDDR Digital I/O Power 3.0 3.3 3.6 CVDDR Reference Clock Power 3.0 3.3 3.6 VDDCAUX1 Auxiliary Core Power 0.95 1.0 1.1 VAUX Auxiliary I/O Power 3.0 3.3 3.6 AVDD1 PCI Express Analog Power 0.95 1.0 1.1 AVDDH PCI Express Analog High Voltage Power 3.0 3.3 3.6 VIH Input High Voltage 2.0 5.5 VIL Input Low Voltage -0.3 0.8 VOH Output High Voltage 2.4 VOL Output Low Voltage 0.4 RPU Pull-up Resistor 63K 92K 142K Ω RPD Pull-down Resistor 57K 91K 159K RST#Slew2 PERST_L Slew Rate 50 mV/ns Note: 1. VDDC/VDDCAUX/AVDD pins' voltage is 0.95v min. important to not operate below these levels. Taking typical PCB/power supply noise factors into consideration, we recommend that customers use 1.0v typical voltage in their board design to ensure solid margin. 2. The min. value for PERST_L Slew Rate is 50 mV/ns, which translates to the requirement that the time for PERST_L from 0V to 3.3V should be less than 66 ns.

12.3 AC SPECIFICATIONS

Table 12-3 PCI Express Interface - Differential Transmitter (TX) Output (5.0 Gbps) Characteristics Parameter Symbol Min Typ Max Unit Unit Interval UI 199.94 200.0 200.06 ps Differential p-p TX voltage swing VTX-DIFF-P-P 800 mV ppd Low power d ifferential p-p TX voltage swing VTX-DIFF-P-P-LOW 400 mV ppd TX de-emphasis level ratio VTX-DE-RATIO-3.5dB -3.0 -4.0 dB TX de-emphasis level ratio VTX-DE-RATIO-6dB -5.5 -6.5 dB Transmitter Eye including all jitter sources TTX-EYE 0.75 UI TX deterministic jitter > 1.5 MHz TTX-HF-DJ-DD 0.15 UI TX RMS jitter < 1.5 MHz TTX-LF-RMS 3.0 Ps RMS Transmitter rise and fall time TTX-RISE-FALL 0.15 UI TX rise/fall mismatch TRF-MISMATCH 0.1 UI Maximum TX PLL Bandwidth BWTX-PLL 16 MHz Minimum TX PLL BW for 3dB peaking BWTX-PLL-LO-3DB 8 MHz TX PLL peaking with 8 MHz min BW PKGTX-PLL1 3.0 dB DC Differential TX Impedance ZTX-DIFF-DC 80 120 Ω Transmitter Short-Circuit Current Limit ITX-SHORT 90 mA TX DC Common Mode Voltage VTX-DC-CM 0 3.6 V Absolute Delta of DC Common Mode Voltage During L0 and Electrical Idle VTX-CM-DC-ACTIVE-IDLE- DELTA 0 100 mV Absolute Delta of DC Common Mode Voltage between D+ and D– VTX-CM-DC-LINE-DELTA 0 25 mV Electrical Idle Differential Peak Output Voltage VTX-IDLE-DIFF-AC-p 0 20 mV Voltage VTX-IDLE-DIFF-DC 0 5 mV The Amount of Voltage Change Allowed During Receiver Detection VTX-RCV-DETECT 600 mV Lane-to-Lane Output Skew LTX-SKEW 500 ps + 4 UI ps Table 12-4 PCI Express Interface - Differential Transmitter (TX) Output (2.5 Gbps) Characteristics Parameter Symbol Min Typ Max Unit Unit Interval UI 399.88 400.0 400.12 ps Differential p-p TX voltage swing VTX-DIFF-P-P 800 mV ppd Low power d ifferential p-p TX voltage swing VTX-DIFF-P-P-LOW 400 mV ppd TX de-emphasis level ratio VTX-DE-RATIO -3.0 -4.0 dB Minimum TX eye width TTX-EYE 0.75 UI Maximum time between the jitter median and max deviation from the median TTX-EYE-MEDIAN-to-MAX- JITTER 0.125 UI Transmitter rise and fall time TTX-RISE-FALL 0.125 UI Maximum TX PLL Bandwidth BWTX-PLL 22 MHz Maximum TX PLL BW for 3dB peaking BWTX-PLL-LO-3DB 1.5 MHz Absolute Delta of DC Common Mode Voltage During L0 and Electrical Idle VTX-CM-DC-ACTIVE-IDLE- DELTA 0 100 mV Absolute Delta of DC Common Mode Voltage between D+ and D– VTX-CM-DC-LINE-DELTA 0 25 mV Electrical Idle Differential Peak Output Voltage VTX-IDLE-DIFF-AC-p 0 20 mV The Amount of Voltage Change Allowed During Receiver Detection VTX-RCV-DETECT 600 mV Transmitter DC Common Mode Voltage VTX-DC-CM 0 3.6 V Transmitter Short-Circuit Current Limit ITX-SHORT 90 mA DC Differential TX Impedance ZTX-DIFF-DC 80 100 120 Ω Lane-to-Lane Output Skew LTX-SKEW 500 ps ps

PI7C9X2G304SV Page 102 of 105 June 2025 Document Number DS41218 Rev 11-2 www.diodes.com © 2025 Copyright Diodes Incorporated. All Rights Reserved. PI7C9X2G304SV Parameter Symbol Min Typ Max Unit + 2 UI Table 12-5 PCI Express Interface - Differential Receiver (RX) Input (5.0 Gbps) Characteristics Parameter Symbol Min Typ Max Unit Unit Interval UI 199.94 200.0 200.06 ps Differential RX Peak-to-Peak Voltage VRX-DIFF-PP-CC 120 1200 mV Total jitter tolerance TJRX 0.68 UI Receiver DC common mode impedance ZRX-DC 40 60 Ω RX AC Common Mode Voltage VRX-CM-AC-P 150 mV Electrical Idle Detect Threshold VRX-IDLE-DET-DIFFp-p 65 175 mV Table 12-6 PCI Express Interface - Differential Receiver (RX) Input (2.5 Gbps) Characteristics Parameter Symbol Min Typ Max Unit Unit Interval UI 399.88 400.0 400.12 ps Differential RX Peak-to-Peak Voltage VRX-DIFF-PP-CC 175 1200 mV Receiver eye time opening TRX-EYE 0.4 UI Maximum time delta between median and deviation from median TRX-EYE-MEDIAN-to-MAX- JITTER 0.3 UI Receiver DC common mode impedance ZRX-DC 40 60 Ω DC differential impedance ZRX-DIFF-DC 80 120 Ω RX AC Common Mode Voltage VRX-CM-AC-P 150 mV DC input CM input i mpedance during reset or power down ZRX-HIGH-IMP-DC 200 kΩ Electrical Idle Detect Threshold VRX-IDLE-DET-DIFFp-p 65 175 mV Lane to Lane skew LRX-SKEW 20 ns

12.4 POWER CONSUMPTION

Table 12-7 Power Consumption Active Lane per Port Unit Typ Max Typ Max Typ Max Typ Max Typ Max Typ Max Typ Max Test Conditions: - Typical power measured under the conditions of 1.0V/ 3.3V power rail without device usage on all downstream ports. - Maximum power measured under the conditions of 1.1V/ 3.63V with PCIe2 devices usage on all downstream ports. - Ambient Temperature at 25oC - Power consumption in the table is a reference, be affected by various environments, bus traffic and power supply etc.

12.5 OPERATING AMBIENT TEMPERATURE

Table 12-8 Operating Ambient Temperature (Above which the useful life may be impaired.) Item Min. Max. Unit Ambient Temperature with power applied -40 85 oC Note: Exposure to high temperature conditions for extended periods of time may affect reliability.

13 THERMAL DATA

The information described in this section is provided for reference only. Table 13-1 Thermal Data Power (Watt) Ta (℃) JEDEC Board Airflow (m/s) ƟJA (℃/W) Tj (℃) ƟJC (℃/W) 0.64 85 4-Layer 0 25.5 101.32 11.7 1 21.3 98.632 2 19.9 97.736 Note: 1. Ta: Ambient Temperature 2. TJ: Junction Temperature 3. Maximum allowable junction temperature = 125℃ 4. ƟJA: Thermal Resistance, Junction-to-Ambient 5. ƟJC: Thermal Resistance, Junction-to-Case 6. Power measured under the conditions of 1.0V/ 3.3V with PCIe2 devices usage on all downstream ports 7. The shaded fields provide a recommendation that allows PI7C9X2G304SV to support Industrial Temperature Range.

14 PACKAGE INFORMATION

The package of PI7C9X2 G304SV is a 14mm x 14mm LQFP (128 Pin) package. The following are the package information and mechanical dimension: Figure 14-1 Package Outline Drawing Figure 14-2 Part Marking

15 ORDERING INFORMATION

Orderable Part Number Temperature Range Package Description Pb-Free & Green PI7C9X2G304SVAFDEEX -40o to 85oC (Industrial Temperature) 128-pin, Low Profile Quad Flat Package (LQFP) Yes Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ for more information about Diodes Incorporated’s definitions of Halogen - and Antimony-free, "Green" and Lead- free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. PI 7C 9X2G304SV A FDE E X Pb-Free and Green Package Code Revision Device Type Device Number Pericom Family Tape & Reel

Product Information

PI7C9X2G304SV specifications and overview.

Summary

Gen2 PCIe짰 3-Port/4-Lane ExtremeLo Packet Switch 2011

Description

Gen2 PCIe짰 3-Port/4-Lane ExtremeLo Packet Switch 2011

Source title PI7C9X2G304SV Datasheet(PDF) - Diodes Incorporated

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