Quartus

Output or bidirectional pin <name> in pin location <name> (Pad_<number>) is too close to VREF pin in pin location <name> (Pad_<number>)

CAUSE: You assigned the specified output or bidirectional pin to the specified pin location in the target device that is too close to the VREF pin in the specified location.
ACTION: Assign the output or bidirectional pin to a different location that is at least two pins away from the VREF pin.

See also:

Assigning an Entity or Node to a Location
Assigning Pins
Overview: Making Assignments
Overview: Working with Assignments in the Floorplan Editor

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