Nc-Si Management Interface - Nvidia BlueField-3 User Manual

Pin Number
5
6
7
8

4.3 NC-SI Management Interface

The following table list the NC-SI management interface pinout descriptions. For further details,
please refer to NC-SI Management
Pin Signal
# Name
1 GND GND
2 PKG_ID1 Input (to
BlueField-
3)
3 RBT_RXD0 Output
(from
BlueField-
3)
4 RBT_REF_C Input
LK
5 RBT_RXD1 Output
6 GND GND
Interface.
I/O
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
Description
GND
Sense0
GND
GND
Signal Description
30