The VIO_BANKx output power pin can be used as the reference voltage for the corresponding B2B connector I/O banks.
For example, B2B Connector 1 – I/O Bank 0 is connected to FPGA Bank 2F, and the I/O voltage of FPGA Bank 2F is connected to the corresponding VIO_BANK0 output pin.
Therefore, VIO_BANK0 can be used as the reference voltage for external components connected to this bank, such as level translators and other interface circuits, ensuring that their I/O voltage levels are compatible with the FPGA bank.
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Please find the detailed product information here:
Agilex™ 7 (R31A/R31B/R31C) SoC FPGA System on Module