NVIDIA External Multi-Host Adapter Kit for OCP 3.0 User Manual
NVIDIA External Multi-Host Adapter Kit for OCP 3.0 User Manual

Pinouts Description

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

Pin#

Signal Name

I/O

Description

1

REF_CLK

I

50M REF CLK for NCSI BUS

2

GND

GND

Ground

3

ARB_IN

I

NCSI hardware arbitration input

4

GND

GND

Ground

5

ARB_OUT

O

NCSI hardware arbitration output

6

GND

GND

Ground

7

RX_D0

O

Receive data

8

GND

GND

Ground

9

RX_D1

O

Receive data

10

GND

GND

Ground

11

CRS_DV

O

Carrier sense/Receive Data Valid

12

GND

GND

Ground

13

TX_D0

I

Transmit data

14

RSRV

Reserved

15

TX_D1

I

Transmit data

16

GND

GND

Ground

17

TX_EN

I

Transmit enable

18

GND

GND

Ground

19

NC

20

GND

GND

Ground

21

I2C_SDA

B

I2C Serial Data

22

GND

GND

Ground

23

I2C_SCL

I

I2C Serial Clock

24

GND

GND

Ground

25

GND

GND

Ground

26

GND

GND

Ground

27

3.3V

VDD

Power

28

3.3V

VDD

Power

29

3.3V

VDD

Power

30

3.3V

VDD

Power

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

The mechanical pinout of the 8-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 8-pin ATX type connector can have different pinouts.

Pin#

Signal Name

Description

1

GND

Power Return

2

GND

Power Return

3

GND

Power Return

4

GND

Power Return

5

12V

ATX Supplied 12V

6

12V

ATX Supplied 12V

7

12V

ATX Supplied 12V

8

12V

ATX Supplied 12V

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