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3.3.7 UART Interface Connectivity
A UART debug interface is available on DPU cards via a 20-pin NC-SI connector. For DPUs without onboard BMC hardware, the UART interface is that of the
BlueField-3 device. For DPUs with onboard BMC hardware, the UART interface is that of the NIC BMC device. The connectivity for both cases is shown in the
following table:
NC-SI Connector Pin #
14
16
12
The UART interface is compliant with the TTL 3.3V voltage level. Use a USB-to-UART cable that supports TTL voltage levels to connect the UART Interface for
Arm console access.
It is prohibited to connect any RS-232 cable directly! Only TTL 3.3V voltage level cables are supported.
Do not use the USB-to-UART cable for NC-SI management purposes.
3.3.8 USB 4-pin RA Connector
The USB 4-pin RA USB connector is used to load operating system images. Use a 4-pin male connector to a male Type-A cable to connect to the board.
The male connector to the male Type-A cable is not included in the shipped DPU card box and should be ordered separately as part of the accessories kit
(P/N: MBF35-DKIT).
NVIDIA BlueField-3 DPU User Guide
Signal on DPU without BMC
BF_UART0_RX
BF_UART0_TX
GND
Signal on DPU with BMC
BMC_RX5
BMC_TX5
GND
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