In G36M by default, the IO voltage is set to 1.0V, and the corresponding PMIC LDO can be configured between 1.0V and 1.8V through FSBL.
Since in G36M SOM the PL HP Bank 65 is configured to operate at 1.8V during booting, the signal type is specified as 1.8V in the datasheet.
Similarly, the IO voltages for the PL HP Bank 66, PL HD Banks 43, 44, 45 and 46 are configurable through PMIC’s LDO9, LDO3, LDO4 and LDO7, respectively.
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Please find the detailed product information here:
Zynq™ UltraScale+™ ZU7/ZU5/ZU4 MPSoC System on Module