Input Transition Time timing assignment logic option

Allows you to change the input transition time from the default value assumed by the Quartus^® Prime software. If you specify this option, you change the timing of the input pin. Input Transition Time assignments made in the Assignment Editor apply to both rising and falling edges. Optionally, in the Tcl Console, you can specify separate transition times for rising and falling edges with -rise and -fall options as shown in the following examples:

1. To specify an input transition time of 10 picoseconds to both the rising and falling edges of in[1], type set_instance_assignment -name INPUT_TRANSITION_TIME "10 ps" -to in[1].
2. To specify an input transition time of 20 picoseconds to the rising edge of in[2], type set_instance_assignment -name INPUT_TRANSITION_TIME "20 ps" -to in[2] -rise.
3. To specify an input transition time of 30 picoseconds to the falling edge of in[3], type set_instance_assignment -name INPUT_TRANSITION_TIME "30 ps" -to in[3] -fall.

For Stratix^® IV designs, the specified input transition time affects the timing of the input buffer in the Quartus^® Prime software.

This logic option is available for supported device ( Arria^® V, Cyclone^® IV , Cyclone^® V , Stratix^® IV, and Stratix^® V ) families.