ID:176673 Following <number> pin(s) must use differential I/O standard -- the Fitter will automatically assign <name> differential I/O standard to pin(s)

CAUSE: You assigned a non-differential I/O standard to the specified transmitter or receiver pin(s). However, the specified pin(s) can use only a differential I/O standard. The Fitter will automatically assign the specified differential I/O standard to the transmitter or receiver pin(s).

ACTION: No action is required. To avoid receiving this message in the future, delete the assignment or replace the pin(s) assignment I/O standard with a differential I/O standard.