Quartus

Input I/O cell <name> has differential I/O standards, but is assigned to a pin that cannot be used as differential input


CAUSE: You assigned the specified input cell to a pin. You have also assigned a differential I/O standard to the specified cell. However, the destination pin cannot be used as a differential input.
ACTION: Remove the I/O standards assigned to the specified input I/O cell, or assign the specified input I/O cell to a different location.

See also:

Assigning Pins
Deleting Assignments in the Assignment Organizer
Changing Assignments
Overview: Working with Assignments in the Assignment Organizer
Overview: Working with Assignments in the Floorplan Editor

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