Slew Rate logic option

A logic option that controls the low-to-high or high-to-low transitions on output pins to help reduce switching noise. When a large number of output pins switch simultaneously, pins that use the lowest Slew Rate options help reduce switching noise.

This option is ignored if it is applied to anything other than an output or bidirectional pin, or a top-level design entity containing output or bidirectional pins. Note that using this option may increase the delay for output or bidirectional pins, potentially affecting slack on tCO paths for the affected pins. This option is available for supported device ( Arria^® II, Cyclone^® III, Cyclone^® IV, Stratix^® III, Stratix^® IV, Stratix^® V) families.