Quartus

Pin <name> is assigned to location <name>, but must be at least two pads away from VREF pin <name>


CAUSE: You used the Floorplan Editor to assign the specified output or bidirectional pin to the specified location that is too close to the specified VREF pin. You cannot place an output or bidirectional pin within two pads of a VREF pin.
ACTION: Assign the output or bidirectional pin to a location that is at least two pads away from the VREF pin.

See also:

Overview: Working with Assignments in the Floorplan Editor
Pin Placement Restrictions for Mercury Devices

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