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PCI Express Interface

The BF2500 Controller Card uses a PCI Express x16 connector (component and print sides) according to the PCI Express 4.0 specifications. The following two tables provide component side pins description and print side pins description. 

Pin #Signal NameI/ODescriptionPin #Signal NameI/ODescription
A1PRSNT1#Input

Card presence detect, connected to PRSNT2#

B112VPower12V
A212VPower12VB212VPower12V
A312VPower12VB312VPower12V
A4GNDGNDGroundB4GNDGNDGround
A5TCK
JTAG - Not ConnectedB5SMCLKI/O

SMBUS_SCL - connected to DPU SoC

A6TDIInputOn-board loop

B6SMDATI/OSMBUS_SDA - connected to DPU SoC
A7TDOOutputB7GNDGNDGround
A8TMS
JTAG - Not ConnectedB83.3VPower3.3V - Not Connected
A93.3VPower3.3V - Not ConnectedB9TRST#
JTAG - Not Connected
A103.3VPower3.3V - Not ConnectedB103.3V_AUXPower3.3V auxiliary power
A11PERST#Input

PCIe Interface Reset#, driven by DPU SoC

B11WAKE#/RSVD
Not connected, option connect to NIC_GPIO[13]
A12GNDGNDGroundB12RSVD
Not connected
A13REFCLK+Output

PCIe Reference Differential Clock. Not connected (default)

B13GNDGNDGround
A14REFCLK-Output

PCIe Reference Differential Clock. Not connected (default)

B14PETP0InputDPU SoC RX
A15GNDGNDGroundB15PETN0InputDPU SoC RX
A16PERP0OutputDPU SoC TXB16GNDGNDGround
A17PERN0OutputDPU SoC TXB17RSVD
Ground
A18GNDGNDGroundB18GNDGNDGround
A19RSVD
Not connectedB19PETP1InputDPU SoC RX
A20GNDGNDGroundB20PETN1InputDPU SoC RX
A21PERP1OutputDPU SoC TXB21GNDGNDGround
A22PERN1OutputDPU SoC TXB22GNDGNDGround
A23GNDGNDGroundB23PETP2InputDPU SoC RX
A24GNDGNDGroundB24PETN2InputDPU SoC RX
A25PERP2OutputDPU SoC TXB25GNDGNDGround
A26PERN2OutputDPU SoC TXB26GNDGNDGround
A27GNDGNDGroundB27PETP3InputDPU SoC RX
A28GNDGNDGroundB28PETN3InputDPU SoC RX
A29PERP3OutputDPU SoC TXB29GNDGNDGround
A30PERN3OutputDPU SoC TXB30RSVD
Not connected
A31GNDGNDGroundB31RSVD
Not connected
A32RSVD
Not connectedB32GNDGNDGround
A33RSVD
Not connectedB33PETP4InputDPU SoC RX
A34GNDGNDGroundB34PETN4InputDPU SoC RX
A35PERP4OutputDPU SoC TXB35GNDGNDGround
A36PERN4OutputDPU SoC TXB36GNDGNDGround
A37GNDGNDGroundB37PETP5InputDPU SoC RX
A38GNDGNDGroundB38PETN5InputDPU SoC RX
A39PERP5OutputDPU SoC TXB39GNDGNDGround
A40PERN5OutputDPU SoC TXB40GNDGNDGround
A41GNDGNDGroundB41PETP6InputDPU SoC RX
A42GNDGNDGroundB42PETN6InputDPU SoC RX
A43PERP6OutputDPU SoC TXB43GNDGNDGround
A44PERN6OutputDPU SoC TXB44GNDGNDGround
A45GNDGNDGroundB45PETP7InputDPU SoC RX
A46GNDGNDGroundB46PETN7InputDPU SoC RX
A47PERP7OutputDPU SoC TXB47GNDGNDGround
A48PERN7OutputDPU SoC TXB48RSVD
Not connected
A49GNDGNDGroundB49GNDGNDGround
A50RSVD
Not connectedB50PETP8InputDPU SoC RX
A51GNDGNDGroundB51PETN8InputDPU SoC RX
A52PERP8OutputDPU SoC TXB52GNDGNDGround
A53PERN8OutputDPU SoC TXB53GNDGNDGround
A54GNDGNDGroundB54PETP9InputDPU SoC RX
A55GNDGNDGroundB55PETN9InputDPU SoC RX
A56PERP9OutputDPU SoC TXB56GNDGNDGround
A57PERN9OutputDPU SoC TXB57GNDGNDGround
A58GNDGNDGroundB58PETP10InputDPU SoC RX
A59GNDGNDGroundB59PETN10InputDPU SoC RX
A60PERP10OutputDPU SoC TXB60GNDGNDGround
A61PERN10OutputDPU SoC TXB61GNDGNDGround
A62GNDGNDGroundB62PETP11InputDPU SoC RX
A63GNDGNDGroundB63PETN11InputDPU SoC RX
A64PERP11OutputDPU SoC TXB64GNDGNDGround
A65PERN11OutputDPU SoC TXB65GNDGNDGround
A66GNDGNDGroundB66PETP12InputDPU SoC RX
A67GNDGNDGroundB67PETN12InputDPU SoC RX
A68PERP12OutputDPU SoC TXB68GNDGNDGround
A69PERN12OutputDPU SoC TXB69GNDGNDGround
A70GNDGNDGroundB70PETP13InputDPU SoC RX
A71GNDGNDGroundB71PETN13InputDPU SoC RX
A72PERP13OutputDPU SoC TXB72GNDGNDGround
A73PERN13OutputDPU SoC TXB73GNDGNDGround
A74GNDGNDGroundB74PETP14InputDPU SoC RX
A75GNDGNDGroundB75PETN14InputDPU SoC RX
A76PERP14OutputDPU SoC TXB76GNDGNDGround
A77PERN14OutputDPU SoC TXB77GNDGNDGround
A78GNDGNDGroundB78PETP15InputDPU SoC RX
A79GNDGNDGroundB79PETN15InputDPU SoC RX
A80PERP15OutputDPU SoC TXB80GNDGNDGround
A81PERN15OutputDPU SoC TXB81PRSNT2#Outputx16 PCIe card detection, connected to PRESNT1#
A82GNDGNDGroundB82RSVD
Not connected


Power Sequencing

The BF2500 Controller Card requires the 12V ATX PCIe power to come up prior or at the same time to the +12V at the PCIe edge connector.

NC-SI Management Interface


Pin#

Signal Name

I/O

Description

Comment
1REF_CLKInput50M REF CLK for NCSI BUS
2GNDGNDGround
3ARB_INInputNCSI hardware arbitration input
4GNDGNDGround
5ARB_OUTOutputNCSI hardware arbitration output
6GNDGNDGround
7RX_D0OutputReceive dataOutput for SoC
8GNDGNDGround
9RX_D1OutputReceive dataOutput for SoC
10GNDGNDGround
11CRS_DVOutputCarrier sense/Receive Data Valid
12GNDGNDGround
13TX_D0InputTransmit dataInput for SoC
14GNDGNDGround
15TX_D1InputTransmit dataInput for SoC
16GNDGNDGround
17TX_ENInputTransmit enable
18GNDGNDGround
19NC


20NC 


21I2C_SDABidirectionalI2C Serial DataGW_ARM1
22GNDGNDGround
23I2C_SCLBidirectionalI2C Serial ClockGW_ARM1
24GNDGNDGround
25GNDGNDGround
26GNDGNDGround
27NC 


28UART_TXOutputTransmit data Output for SoC
29NC


30UART_RXInputReceive data 


External Power Supply Connector (6-pin ATX Connector)

The below table provides the External Power Supply pins of the external power supply interfaces on the DPU. For further details, please refer to External PCIe Power Supply Connector.

The mechanical pinout of the 6-pin external +12V power connector is shown below. The +12V connector is a GPU power PCIe standard connector. Care should be taken to ensure the power is applied to the correct pins as some 6-pin ATX type connector can have different pinouts.

Pin#

Signal Name

Description

112VATX Supplied 12V
212VATX Supplied 12V
312VATX Supplied 12V
4GNDPower Return
5GNDPower Return
6GNDPower Return



External +12V Mechanical Pinout Diagram