9.3.25 Slew
(Ask a Question)The slew rate is the amount of rise or fall time an input signal takes to get from logic low to logic high or vice versa. It is commonly defined to be the propagation delay between 10% and 90% of the signal's voltage swing. The I/O Editor supports slew rate control in non-differential output mode.
Turning the slew rate on (either by setting it to ON in the I/O Editor or in a PDC file) results in a slew rate limited for the I/O standard in the device. When the value for SLEW in the I/O Editor or PDC command is (chosen) OFF, the device uses the maximum slew rate for the I/O standard to reduce the impact of simultaneous switching noise (SSN). Not all I/O standards support the slew rate control.