The Pin cell in the I/O Attribute Editor displays either the I/O macro’s assigned Pin number or its Unassigned status. If you know the pin number assignment, type the location into the Pin cell.
Edits you make in PinEditor are permanent, as long as they are locked and committed. (See Locking and Unlocking Pins for more information.)
To assign an I/O macro using the I/O Attribute Editor:
Select the Pin cell for the desired macro in the I/O Attribute Editor.
In the Pin cell, type the pin number or select a valid pin assignment from the drop-down list.
Note: If you assign a macro to a pin that has already been assigned a macro, the previously assigned macro becomes unassigned. Since PinEditor locks all assigned macros, the reassignment unlocks the previous assignment.