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4.3 NC-SI Management Interface
The following table list the NC-SI management interface pinout descriptions. For further details, please refer to
Pin# Signal Name
I/O
1
GND
GND
2
PKG_ID1
Input (to
BlueField-3)
3
RBT_RXD0
Output (from
BlueField-3)
4
RBT_REF_CLK
Input
5
RBT_RXD1
Output
6
GND
GND
7
RBT_CRS_DV
Output
NVIDIA BlueField-3 DPU User Guide
Signal Description
Ground
NC-SI PKG_ID
Shoul be connected to the Primary controller NC-SI PKG_ID pins to set the appropriate package ID.
PKG_ID0 should be connected to the endpoint device GPIO associated with Package ID[0]. PKG_ID1 should be associated
with Package ID[1].
Baseboard should connect to GND or leave floating.
DPU should have a 4.7k PU.
Receive data. Data signals from the network controller to the BMC.
For baseboards, this pin should be connected between the baseboard NC-SI over RBT PHY and the connector. This signal
requires a 100 kΩ pull down resistor to GND on the baseboard between the BMC and the RBT isolator to prevent the
signal from floating when no card is installed.
For DPUs, this pin should be connected between the connector and the RBT PHY. External termination determined by
the DPU RBT PHY requirements.
RBT Reference clock. Synchronous clock reference for receive, transmit and control interface. The clock should have a
typical frequency of 50MHz ±50 ppm.
For baseboards, this pin should be connected between the baseboard NC-SI over RBT PHY and the DPU cable connector.
The RBT_REF_CLK should not be driven until 3.3V AUX is present on the DPU. The RBT_REF_CLK should be continuous
once it has started.
For DPUs, this pin should be connected between the connector and the RBT PHY. No external termination is required.
Receive data. Data signals from the network controller to the BMC.
For baseboards, this pin should be connected between the baseboard NC-SI over RBT PHY and the connector. This signal
requires a 100 kΩ pull down resistor to GND on the baseboard between the BMC and the RBT isolator to prevent the
signal from floating when no card is installed.
For DPUs, this pin should be connected between the connector and the RBT PHY. External termination determined by
the DPU RBT PHY requirements.
Ground
Carrier sense/receive data valid. This signal is used to indicate to the baseboard that the carrier sense/receive data is
valid.
NC-SI Management
Interface.
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