Each I2C I/O expander and multiplexer component has an active-Low reset connected to the adaptive SoC. All components have an external pull-up resistor and therefore are enabled following a power reset. However, they can also be manually controlled by the adaptive SoC using the following pins.
| Signal | Peripheral | Adaptive SoC Pin | External Pullup |
|---|---|---|---|
| I2C_QSFP_RST_B | Mux 0 and 1, power enable, MCIO expansion port | BJ5 | 3.3V |
| QSFP56_1_IOEXP_RST | QSFP56 1 I/O expander | BJ4 | 3.3V |
| QSFP56_2_IOEXP_RST | QSFP56 2 I/O expander | BH4 | 3.3V |
| QSFP56_3_IOEXP_RST | QSFP56 3 I/O expander | BE6 | 3.3V |
| QSFP56_4_IOEXP_RST | QSFP56 4 I/O expander | BF6 | 3.3V |