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check io standard in bank8a, if all io doesnot reference voltage, you can connect it to gnd or vccio in the bank.
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VREF is only needed for inputs. Since all of the signals in your bank 8A are address/control outputs (except for the diff clock input) I'm 99% sure you're fine to tie the VREF pin to GND. Read the handbook and pin connection guidelines to make sure.
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