Nvidia BlueField-2 User Manual page 91

Pin Signal I/O Description
# Name
21 I2C_SDA Bidirection I2C Serial Data
al
22 GND GND Ground
23 I2C_SCL Bidirection I2C Serial Clock
al
24 GND GND Ground
25 GND GND Ground
26 GND GND Ground
27 NC
28 UART_TX Output Transmit data
29 NC
30 UART_RX Input Receive data
Table B - NC-SI Connector Pins

PACK_ID[2:0] signals allow for 8 unique card IDs. The system configurator sets the unique value per card via the connecting harness.
Pin #
1 NCSI_REF_CLK
2 GND
3 NCSI_ARB_IN
GW_ARM1
GW_ARM1
Output for SoC. 3.3V UART TX signal from the baseboard.
3.3V UART RX signal to the baseboard.
Pin Name
Comments
I/O
Input
GND
Input
Description / Comments
50MHz REF CLK for NC-SI BUS
Ground
NC-SI hardware arbitration input
91