Pci Express Interface; Ddr4 Sdram On-Board Memory; Nc-Si Management Interface - Nvidia BlueField-2 InfiniBand/VPI DPU User Manual

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PCI Express Interface

The DPU supports PCI Express Gen 4.0 (1.1, 2.0 and 3.0 compatible) through x16 edge
connectors. The following lists PCIe interface features:
• PCIe Gen 4.0, and 3.0, 2.0 and 1.1 compatible
• 2.5, 5.0, or 8.0, or 16.0 GT/s link rate x16 lanes
• Auto-negotiates to x16, x8, x4, x2, or x1
• Support for MSI/MSI-X mechanisms
DDR4 SDRAM On-Board Memory
The DPU incorporates 16GB @ 3200MT/s single DDR4 channel, 64bit + 8bit ECC, solder-down
memory.
NC-SI Management Interface
The DPU 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. For connecting to the NCSI RBT interface on
the 20 or 30-pin connector, a customized cable is needed based on the
pinouts.
The below table specifies the maximum trace lengths on the board per board type. Please take the
maximum trace length on the board into consideration in your design.

The USB to UART cable is not used for NC-SI management purposes.
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State
4Hz blinking Yellow Indicates an error with the
link. The error can be one of the following:
Error Type
2
I
Over-
current
Blinking Green
Solid Green
Solid Yellow
Bi-Color LED (Yellow/Green)
Description
2
I C access to the
C
networking ports
fails
Over-current
condition of the
networking ports
LED Behavior
Blinks until
error is fixed
Blinks until
error is fixed

NC-SI Management Interface

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