Quartus

Can't place VREF pin <name> in I/O bank <number> -- pin requires a VREF voltage of <name> but the I/O bank uses a VREF voltage of <name>

CAUSE: You assigned the specified VREF pin to the specified I/O bank. However, the Fitter cannot place the VREF pin because the VREF pin and the I/O bank use different VREF voltages.
ACTION: Assign the VREF pin to a different I/O bank or remove the assignment.

See also:

Assigning Pins
Overview: Making Assignments
Overview: Working with Assignments in the Floorplan Editor

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