Nvidia BlueField-3 - NC-SI Management Interface; UART Interface Connectivity; USB 4-Pin RA Connector

22
Model OPNs DDR5 SDRAM On-Board Memory
B3210E 900-9D3B6-00CC-EA0 / 900-9D3B6-00SC-
EA0
Dual-channel with 20 DDR5 + ECC (128bit +
16bit ECC)
for a total of 32GB @ 5200MT/s
B3220
B3210
B3240
900-9D3B6-00CV-AA0 / 900-9D3B6-00SV-
AA0
900-9D3B6-00CC-AA0 / 900-9D3B6-00SC-
AA0
900-9D3B6-00CN-AB0 / 900-9D3B6-00SN-
AB0
Dual-channel with 20 DDR5 + ECC (128bit +
16bit ECC)
for a total of 32GB @ 5600MT/s
3.3.6 NC-SI Management Interface
The BlueField-3 enables the connection of a Baseboard Management Controller (BMC) to a set of
Network Interface Controller (NICs) to enable out-of-band remote manageability. The NC-SI
management is supported over RMII and has a connector on the DPU. Please refer to NC-SI
Management Interfacefor pins.
3.3.7 UART Interface Connectivity
A UART debug interface is available on BlueField-3 boards 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 # Signal on DPU without BMC Signal on DPU with BMC
14 BF_UART0_RX BMC_RX5
16 BF_UART0_TX BMC_TX5
12 GND GND
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.
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.
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.