The VIO_BANK pins A1, B1, C1, D1, B99, and B100 are output power pins used to provide the reference voltage for their respective I/O banks on the carrier card. These pins can be used to supply I/O level translators for the corresponding banks.
iWave does not recommend connecting any external power input to these pins. For more details, please refer SOM datasheet.
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Please find the detailed product information here:
Agilex™ 7 (R31A/R31B/R31C) SoC FPGA System on Module