Nvidia BlueField-3 User Manual page 41

Pin# Signal Name I/O
8 RBT_ISOLATE_N Output
9 GND GND
10 PKG_ID0 Input
11 RBT_TX_EN Input
12 GND GND
13 RBT_TXD0 Input
14 UART_TX Input
NVIDIA BlueField-3 DPU User Guide
Signal Description
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 on the baseboard between the BMC and the RBT isolator to prevent the signal from
floating when no DPU 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.
This signal is used to indicate the DPU has powered and is ready for NC-SI physical layer connection to be present. When
low the baseboard circuitry will isolate the NC-SI connection to the DPU. When high normal NC-SI RBT connectivity is
available.
Baseboards should terminate this with a 47K-100K PD resistor.
DPUs should terminate with a 10k PU resistor.
Ground
NC-SI PKG_ID
should 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.
Transmit enable.
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 ground on the baseboard between the RBT isolator and the DPU cable connector
to prevent the card-side signals from floating when the RBT signals are isolated.
For DPUs, this pin should be connected between the connector and the RBT PHY. External termination determined by
the DPU RBT PHY requirements.
Ground
Transmit data. Data signals from the BMC to the network controller.
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 RBT isolator and the DPU cable connector to
prevent the card-side signals from floating when the RBT signals are isolated.
For DPUs, this pin should be connected between the connector and the RBT PHY. External termination determined by
the DPU RBT PHY requirements.
3.3V UART TX signal from the baseboard
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