The below table applies to the engineering samples of the following OPNs:
MBF2H516C-EECOT, MBF2H516C-EESOT, MBF2M516C-EECOT and MBF2M516C-EESOT.
| Pin # | Pinout | I/O | Description / Comments |
| 1 | NCSI_REF_CLK | Input | 50MHz REF CLK for NC-SI BUS |
| 2 | GND | GND | Ground |
| 3 | NCSI_ARB_IN | Input | NC-SI hardware arbitration input |
| 4 | PACK_ID0, connected to BlueField-2 device pin NIC_GPIO[49] | Input | See the note above table |
| 5 | NCSI_ARB_OUT | Output | NC-SI hardware arbitration output |
| 6 | PACK_ID1, connected to BlueField-2 device pin NIC_GPIO[47] | Input | See the note above table |
| 7 | NCSI_RX_D0 | Output | Receive Data Out 0 |
| 8 | GND | GND | Ground |
| 9 | NCSI_RX_D1 | Output | Receive Data Out 1 |
| 10 | GND | GND | Ground |
| 11 | NCSI_CRS_DV | Output | Carrier Sense / Receive Data Valid |
| 12 | GND | GND | Ground |
| 13 | NCSI_TX_D0 | Input | Transmit Data In 0 |
| 14 | GND | GND | Ground |
| 15 | NCSI_TX_D1 | Input | Transmit Data In 0 |
| 16 | GND | GND | Ground |
| 17 | NCSI_TX_EN | Input | Transmit Enable |
| 18 | GND | GND | Ground |
| 19 | Reserved | ||
| 20 | Reserved | ||
| 21 | BMC_I2C2_SDA | Input/Output | Open-drain signal |
| 22 | NIC_BMC_CTRL1, connected to BMC device pin W4 (Open Drain) | Input/Output | Open-drain signal |
| 23 | BMC_I2C2_SCL | Input/Output | Open-drain signal |
| 24 | PACK_ID2, connected to BlueField-2 device pin NIC_GPIO[46] | Input | See description above table |
| 25 | GND | GND | Ground |
| 26 | NIC_BMC_CTRL0, connected to BMC device pin Y3 (Open Drain) | ||
| 27 | Not Connected | ||
| 28 | BMC_TX5 | Output | UART transmit serial data output |
| 29 | Not Connected | ||
| 30 | BMC_RX5 | Input | UART transmit serial data input |