HP Bank Voltage Architecture (Banks 64 & 66): In G30M SOM, the HP Bank 64 and 66 voltage are sourced from a single source power regualtor. There is no option to select different VCCO for bank 64 and 66.
Due to this shared hardware architecture, independent voltage selection for these two banks is not possible. Both Bank 64 and Bank 66 must operate at the same voltage level.
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Please find the detailed G30M product information in the below link,