ID:169071 Too many output and bidirectional pins in I/O bank <name> assigned near VREF pin <name> (<name>) on device <name> -- no more than <number> output and bidirectional pins allowed near the VREF pin when voltage referenced pins are driving in, but there are potentially <number> pins driving out

CAUSE: You assigned output and bidirectional pins to the specified I/O bank near the specified VREF pin. However, the number of pins exceeds the limit for the 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 output and/or bidirectional pins to a different VREF bank, or move all input pins to a different VREF bank. To display I/O banks, open the Chip Planner and turn on I/O bank display IN the Layers Settings dialog box.