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3.3.4 PCI Express Interface
The DPU supports PCI Express Gen 5.0/4.0 through x16 edge connectors. Some cards allow connectivity to an additional PCIe x16 Auxiliary card through the
Cabline CA-II Plus connectors.
The following lists PCIe interface features:
•
PCIe Gen 5.0, 4.0, 3.0, 2.0 and 1.1 compatible
•
2.5, 5.0, or 8.0, 16.0 or 32.0 GT/s link rate x16 lanes
•
Auto-negotiates to x16, x8, x4, x2, or x1
3.3.5 DDR5 SDRAM On-Board Memory
The DPUs incorporate 10 or 20 units of DDR5 SDRAM. See the following table for DDR5 SDRAM memory specifications per ordering part number.
Model
OPNs
B3140L
900-9D3B4-00EN-EA0 / 900-9D3B4-00PN-EA0
B3140H
900-9D3D4-00EN-HA0 / 900-9D3D4-00NN-HA0
B3220
900-9D3B6-00CV-AA0 / 900-9D3B6-00SV-AA0
B3210
900-9D3B6-00CC-AA0 / 900-9D3B6-00SC-AA0
B3240
900-9D3B6-00CN-AB0 / 900-9D3B6-00SN-AB0
3.3.6 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. Please refer to
NVIDIA BlueField-3 DPU User Guide
DDR5 SDRAM On-Board Memory
Single-channel with 10 DDR5 + ECC (64bit + 8bit ECC) for a total of 16GB @ 5200MT/s
Dual-channel with 20 DDR5 + ECC (128bit + 16bit ECC) for a total of 32GB @ 5600MT/s
NC-SI Management Interface
for pins.
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