ID:14759 Too many input pins in I/O bank <name> assigned in VREF group <name> -- no more than <number> input pins are allowed near the VREF pin when voltage referenced pins are driving in

CAUSE: You've assigned input pins to the specified I/O bank near the specified VREF pin. However, the number of pins exceeds the limit for that VREF bank and can cause instability in the V_REF voltage, which can then cause any inputs depending on that VREF pin to be read incorrectly.

ACTION: Reassign some of the input pins to a different VREF bank. Open up Pin Planner to check the pad placement, and then reassign the conflicting I/O pins to different location.