Задаю один вывод. Другой парный подключается сам. (* chip_pin = "89", altera_attribute = "-name io_standard lvds" *) input ClkIn,
Но пишет предупреждение. Warning (176118): Pin "ClkIn" is a differential I/O pin but does not have its complement pin. Hence, fitter automatically created the complement pin "ClkIn(n)"