PCI Express Interface

NVIDIA Docs Hub NVIDIA Networking BlueField DPUs / SuperNICs & DOCA NVIDIA BlueField-2 BF2500 InfiniBand/Ethernet DPU Controller User Manual PCI Express Interface

PCIe x16 Gen 4.0 Edge Connector

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. For further details, please refer to PCIe x16 Gen 3.0/4.0 Edge Interface.

Warning

HSOp(x) and HSOn(x) stand for High Speed Output and HSIp(x) and HSIn(x) stand for High Speed Input. The direction is relative to the motherboard or system board.

Side A

Pin#	Pin Name	Pin Definition	Description
A1	PRSNT1#	INPUT	Card presence detect, connected to PRSNT2#
A2	12V	POWER	12V power
A3	12V	POWER	12V power
A4	GND	GND	Ground
A5	TCK	NC	Not connected
A6	TDI	INPUT	on board loop
A7	TDO	OUTPUT	on board loop
A8	TMS	NC	Not connected
A9	3.3V	POWER	3.3V power
A10	3.3V	POWER	3.3V power
A11	PERST#	OUTPUT	PCIe Interface Reset#, drived by SoC
Key
A12	GND	GND	Ground
A13	REFCLK+	OUTPUT	PCIe Reference Differential Clock. Not connected (default)
A14	REFCLK-	OUTPUT	PCIe Reference Differential Clock. Not connected (default)
A15	GND	GND	Ground
A16	PERP0	OUTPUT	SoC TX
A17	PERN0	OUTPUT	SoC TX
A18	GND	GND	Ground
A19	RSVD	NC	Not connected, option for SER_DO
A20	GND	GND	Ground
A21	PERP1	OUTPUT	SoC TX
A22	PERN1	OUTPUT	SoC TX
A23	GND	GND	Ground
A24	GND	GND	Ground
A25	PERP2	OUTPUT	SoC TX
A26	PERN2	OUTPUT	SoC TX
A27	GND	GND	Ground
A28	GND	GND	Ground
A29	PERP3	OUTPUT	SoC TX
A30	PERN3	OUTPUT	SoC TX
A31	GND	GND	Ground
A32	RSVD	NC	Not connected, option for SER_CLK
A33	RSVD	NC	Not connected, option for SER_CAP
A34	GND	GND	Ground
A35	PERP4	OUTPUT	SoC TX
A36	PERN4	OUTPUT	SoC TX
A37	GND	GND	Ground
A38	GND	GND	Ground
A39	PERP5	OUTPUT	SoC TX
A40	PERN5	OUTPUT	SoC TX
A41	GND	GND	Ground
A42	GND	GND	Ground
A43	PERP6	OUTPUT	SoC TX
A44	PERN6	OUTPUT	SoC TX
A45	GND	GND	Ground
A46	GND	GND	Ground
A47	PERP7	OUTPUT	SoC TX
A48	PERN7	OUTPUT	SoC TX
A49	GND	GND	Ground
A50	RSVD	NC	Not connected
A51	GND	GND	Ground
A52	PERP8	OUTPUT	SoC TX
A53	PERN8	OUTPUT	SoC TX
A54	GND	GND	Ground
A55	GND	GND	Ground
A56	PERP9	OUTPUT	SoC TX
A57	PERN9	OUTPUT	SoC TX
A58	GND	GND	Ground
A59	GND	GND	Ground
A60	PERP10	OUTPUT	SoC TX
A61	PERN10	OUTPUT	SoC TX
A62	GND	GND	Ground
A63	GND	GND	Ground
A64	PERP11	OUTPUT	SoC TX
A65	PERN11	OUTPUT	SoC TX
A66	GND	GND	Ground
A67	GND	GND	Ground
A68	PERP12	OUTPUT	SoC TX
A69	PERN12	OUTPUT	SoC TX
A70	GND	GND	Ground
A71	GND	GND	Ground
A72	PERP13	OUTPUT	SoC TX
A73	PERN13	OUTPUT	SoC TX
A74	GND	GND	Ground
A75	GND	GND	Ground
A76	PERP14	OUTPUT	SoC TX
A77	PERN14	OUTPUT	SoC TX
A78	GND	GND	Ground
A79	GND	GND	Ground
A80	PERP15	OUTPUT	SoC TX
A81	PERN15	OUTPUT	SoC TX
A82	GND	GND	Ground

Side B

Pin#	Pin Name	Pin Definition	Description
B1	12V	POWER	12V power
B2	12V	POWER	12V power
B3	12V	POWER	12V power
B4	GND	GND	Ground
B5	SMCLK	I/O	SMBUS_SCL - connected to BlueField IPU
B6	SMDAT	I/O	SMBUS_SDA - connected to BlueField IPU
B7	GND	GND	Ground
B8	3.3V	POWER	3.3V power
B9	TRST#	NC	Not connected
B10	3.3V_AUX	POWER	3.3V auxilary power
B11	WAKE	NC	Not connected, option connect to NIC_GPIO[13]
Key
B12	RSVD	NC	Not connected, option for SER_DI
B13	GND	GND	Ground
B14	PETP0	IN	SoC RX
B15	PETN0	IN	SoC RX
B16	GND	GND	Ground
B17	PRESNT2#	NC	Not connected
B18	GND	GND	Ground
B19	PETP1	IN	SoC RX
B20	PETN1	IN	SoC RX
B21	GND	GND	Ground
B22	GND	GND	Ground
B23	PETP2	IN	SoC RX
B24	PETN2	IN	SoC RX
B25	GND	GND	Ground
B26	GND	GND	Ground
B27	PETP3	IN	SoC RX
B28	PETN3	IN	SoC RX
B29	GND	GND	Ground
B30	RSVD	NC	Not connected
B31	PRESNT2#	NC	Not connected
B32	GND	GND	Ground
B33	PETP4	IN	SoC RX
B34	PETN4	IN	SoC RX
B35	GND	GND	Ground
B36	GND	GND	Ground
B37	PETP5	IN	SoC RX
B38	PETN5	IN	SoC RX
B39	GND	GND	Ground
B40	GND	GND	Ground
B41	PETP6	IN	SoC RX
B42	PETN6	IN	SoC RX
B43	GND	GND	Ground
B44	GND	GND	Ground
B45	PETP7	IN	SoC RX
B46	PETN7	IN	SoC RX
B47	GND	GND	Ground
B48	PRESNT2#	NC	Not connected
B49	GND	GND	Ground
B50	PETP8	IN	SoC RX
B51	PETN8	IN	SoC RX
B52	GND	GND	Ground
B53	GND	GND	Ground
B54	PETP9	IN	SoC RX
B55	PETN9	IN	SoC RX
B56	GND	GND	Ground
B57	GND	GND	Ground
B58	PETP10	IN	SoC RX
B59	PETN10	IN	SoC RX
B60	GND	GND	Ground
B61	GND	GND	Ground
B62	PETP11	IN	SoC RX
B63	PETN11	IN	SoC RX
B64	GND	GND	Ground
B65	GND	GND	Ground
B66	PETP12	IN	SoC RX
B67	PETN12	IN	SoC RX
B68	GND	GND	Ground
B69	GND	GND	Ground
B70	PETP13	IN	SoC RX
B71	PETN13	IN	SoC RX
B72	GND	GND	Ground
B73	GND	GND	Ground
B74	PETP14	IN	SoC RX
B75	PETN14	IN	SoC RX
B76	GND	GND	Ground
B77	GND	GND	Ground
B78	PETP15	IN	SoC RX
B79	PETN15	IN	SoC RX
B80	GND	GND	Ground
B81	PRESNT2#	OUT	X16 PCIe card detection, connected to PRESNT1#
B82	RSVD	NC	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

The below table lists the NCSI Management Interface pins description. For further details, please refer to NC-SI Management Interface.

Pin#	Signal Name	I/O	Description
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 Interfaces

The below table lists the External Power Supply pins of the external power supply interface on the BF2500 Controller card. For further details, please refer to External PCIe Power Supply Interfaces.

Warning

The mechanical pinout of the 6-pin external +12V power connector is shown below. This +12V connector is sometimes referred to as EPS-12V. 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	Sense	Indicates proper connectivity
6	GND	Power Return

External +12V Mechanical Pinout Diagram

UART Interface

The below table lists the UART0 interface pins from the BlueField Controller Card perspective. For further details, please refer to UART0 Interface.

Warning

The electrical levels of the UART0 interface is TTL (3.3V).

Mini USB Interface

The below table lists the Mini USB interface pins. For further details, please refer to Mini USB Interface.

Pin	Name	Description
1	Vcc	+5v
2	D-	Data -
3	D+	Data +
4	ID	N/A
5	GND	Ground

PCI Express Interface

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