you can set the transition time for the input pins, the command is: set_input_transtion input_ports
you also can constrain the transition time for the output pins, the command is:
set_max_transtion outpout_ports
Design Compiler will select correct cells to meet the constrain
Hello
can anyone tell me how to select set up time, hold time , rise time , fall time.
This is basically depends on the technology you are targetting you need to see the basic element
there its given min/max/typical
based on that you can choose like eg, for taget technology of 0.18u the mux set up is 0.2 ns
etc
do we need to give transition time for the output pins also
yes we do need to give that
how the user of chip will understand that when i have to capture the signal
for the transition time(slew), usually you dont need to give it out directly, for the input you just specify a driving cell or a drive strength, for the output you just specify a loading capacitance, that's it.
Set up time and hold time are defined in the library and it varies with the size of the flop.... we can give the input slew and it is also dependent on the input capacitance... the output slew is dependent on the output capacitance.. i mean load....