Pin Description | NVIDIA BlueField-2 BF2500 Ethernet DPU Controller User Manual

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 Name	I/O	Description	Pin #	Signal Name	I/O	Description
A1	PRSNT1#	Input	Card presence detect, connected to PRSNT2#	B1	12V	Power	12V
A2	12V	Power	12V	B2	12V	Power	12V
A3	12V	Power	12V	B3	12V	Power	12V
A4	GND	GND	Ground	B4	GND	GND	Ground
A5	TCK		JTAG - Not Connected	B5	SMCLK	I/O	SMBUS_SCL - connected to DPU SoC
A6	TDI	Input	On-board loop	B6	SMDAT	I/O	SMBUS_SDA - connected to DPU SoC
A7	TDO	Output	On-board loop	B7	GND	GND	Ground
A8	TMS		JTAG - Not Connected	B8	3.3V	Power	3.3V - Not Connected
A9	3.3V	Power	3.3V - Not Connected	B9	TRST#		JTAG - Not Connected
A10	3.3V	Power	3.3V - Not Connected	B10	3.3V_AUX	Power	3.3V auxiliary power
A11	PERST#	Input	PCIe Interface Reset#, driven by DPU SoC	B11	WAKE#/RSVD		Not connected, option connect to NIC_GPIO[13]
A12	GND	GND	Ground	B12	RSVD		Not connected
A13	REFCLK+	Output	PCIe Reference Differential Clock. Not connected (default)	B13	GND	GND	Ground
A14	REFCLK-	Output	PCIe Reference Differential Clock. Not connected (default)	B14	PETP0	Input	DPU SoC RX
A15	GND	GND	Ground	B15	PETN0	Input	DPU SoC RX
A16	PERP0	Output	DPU SoC TX	B16	GND	GND	Ground
A17	PERN0	Output	DPU SoC TX	B17	RSVD		Ground
A18	GND	GND	Ground	B18	GND	GND	Ground
A19	RSVD		Not connected	B19	PETP1	Input	DPU SoC RX
A20	GND	GND	Ground	B20	PETN1	Input	DPU SoC RX
A21	PERP1	Output	DPU SoC TX	B21	GND	GND	Ground
A22	PERN1	Output	DPU SoC TX	B22	GND	GND	Ground
A23	GND	GND	Ground	B23	PETP2	Input	DPU SoC RX
A24	GND	GND	Ground	B24	PETN2	Input	DPU SoC RX
A25	PERP2	Output	DPU SoC TX	B25	GND	GND	Ground
A26	PERN2	Output	DPU SoC TX	B26	GND	GND	Ground
A27	GND	GND	Ground	B27	PETP3	Input	DPU SoC RX
A28	GND	GND	Ground	B28	PETN3	Input	DPU SoC RX
A29	PERP3	Output	DPU SoC TX	B29	GND	GND	Ground
A30	PERN3	Output	DPU SoC TX	B30	RSVD		Not connected
A31	GND	GND	Ground	B31	RSVD		Not connected
A32	RSVD		Not connected	B32	GND	GND	Ground
A33	RSVD		Not connected	B33	PETP4	Input	DPU SoC RX
A34	GND	GND	Ground	B34	PETN4	Input	DPU SoC RX
A35	PERP4	Output	DPU SoC TX	B35	GND	GND	Ground
A36	PERN4	Output	DPU SoC TX	B36	GND	GND	Ground
A37	GND	GND	Ground	B37	PETP5	Input	DPU SoC RX
A38	GND	GND	Ground	B38	PETN5	Input	DPU SoC RX
A39	PERP5	Output	DPU SoC TX	B39	GND	GND	Ground
A40	PERN5	Output	DPU SoC TX	B40	GND	GND	Ground
A41	GND	GND	Ground	B41	PETP6	Input	DPU SoC RX
A42	GND	GND	Ground	B42	PETN6	Input	DPU SoC RX
A43	PERP6	Output	DPU SoC TX	B43	GND	GND	Ground
A44	PERN6	Output	DPU SoC TX	B44	GND	GND	Ground
A45	GND	GND	Ground	B45	PETP7	Input	DPU SoC RX
A46	GND	GND	Ground	B46	PETN7	Input	DPU SoC RX
A47	PERP7	Output	DPU SoC TX	B47	GND	GND	Ground
A48	PERN7	Output	DPU SoC TX	B48	RSVD		Not connected
A49	GND	GND	Ground	B49	GND	GND	Ground
A50	RSVD		Not connected	B50	PETP8	Input	DPU SoC RX
A51	GND	GND	Ground	B51	PETN8	Input	DPU SoC RX
A52	PERP8	Output	DPU SoC TX	B52	GND	GND	Ground
A53	PERN8	Output	DPU SoC TX	B53	GND	GND	Ground
A54	GND	GND	Ground	B54	PETP9	Input	DPU SoC RX
A55	GND	GND	Ground	B55	PETN9	Input	DPU SoC RX
A56	PERP9	Output	DPU SoC TX	B56	GND	GND	Ground
A57	PERN9	Output	DPU SoC TX	B57	GND	GND	Ground
A58	GND	GND	Ground	B58	PETP10	Input	DPU SoC RX
A59	GND	GND	Ground	B59	PETN10	Input	DPU SoC RX
A60	PERP10	Output	DPU SoC TX	B60	GND	GND	Ground
A61	PERN10	Output	DPU SoC TX	B61	GND	GND	Ground
A62	GND	GND	Ground	B62	PETP11	Input	DPU SoC RX
A63	GND	GND	Ground	B63	PETN11	Input	DPU SoC RX
A64	PERP11	Output	DPU SoC TX	B64	GND	GND	Ground
A65	PERN11	Output	DPU SoC TX	B65	GND	GND	Ground
A66	GND	GND	Ground	B66	PETP12	Input	DPU SoC RX
A67	GND	GND	Ground	B67	PETN12	Input	DPU SoC RX
A68	PERP12	Output	DPU SoC TX	B68	GND	GND	Ground
A69	PERN12	Output	DPU SoC TX	B69	GND	GND	Ground
A70	GND	GND	Ground	B70	PETP13	Input	DPU SoC RX
A71	GND	GND	Ground	B71	PETN13	Input	DPU SoC RX
A72	PERP13	Output	DPU SoC TX	B72	GND	GND	Ground
A73	PERN13	Output	DPU SoC TX	B73	GND	GND	Ground
A74	GND	GND	Ground	B74	PETP14	Input	DPU SoC RX
A75	GND	GND	Ground	B75	PETN14	Input	DPU SoC RX
A76	PERP14	Output	DPU SoC TX	B76	GND	GND	Ground
A77	PERN14	Output	DPU SoC TX	B77	GND	GND	Ground
A78	GND	GND	Ground	B78	PETP15	Input	DPU SoC RX
A79	GND	GND	Ground	B79	PETN15	Input	DPU SoC RX
A80	PERP15	Output	DPU SoC TX	B80	GND	GND	Ground
A81	PERN15	Output	DPU SoC TX	B81	PRSNT2#	Output	x16 PCIe card detection, connected to PRESNT1#
A82	GND	GND	Ground	B82	RSVD		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
1	REF_CLK	Input	50M REF CLK for NCSI BUS
2	GND	GND	Ground
3	ARB_IN	Input	NCSI hardware arbitration input
4	GND	GND	Ground
5	ARB_OUT	Output	NCSI hardware arbitration output
6	GND	GND	Ground
7	RX_D0	Output	Receive data	Output for SoC
8	GND	GND	Ground
9	RX_D1	Output	Receive data	Output for SoC
10	GND	GND	Ground
11	CRS_DV	Output	Carrier sense/Receive Data Valid
12	GND	GND	Ground
13	TX_D0	Input	Transmit data	Input for SoC
14	GND	GND	Ground
15	TX_D1	Input	Transmit data	Input for SoC
16	GND	GND	Ground
17	TX_EN	Input	Transmit enable
18	GND	GND	Ground
19	NC
20	NC
21	I2C_SDA	Bidirectional	I2C Serial Data	GW_ARM1
22	GND	GND	Ground
23	I2C_SCL	Bidirectional	I2C Serial Clock	GW_ARM1
24	GND	GND	Ground
25	GND	GND	Ground
26	GND	GND	Ground
27	NC
28	UART_TX	Output	Transmit data	Output for SoC
29	NC
30	UART_RX	Input	Receive 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
1	12V	ATX Supplied 12V
2	12V	ATX Supplied 12V
3	12V	ATX Supplied 12V
4	GND	Power Return
5	GND	Power Return
6	GND	Power Return

External +12V Mechanical Pinout Diagram

Last updated: June 17, 2021