ID:176187 Transmitter or receiver pin <name> must use differential I/O standard -- Fitter will automatically assign <name> differential I/O standard to pin

CAUSE: You assigned a non-differential I/O standard to the specified transmitter or receiver pin. However, the specified pin 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.

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