how to determine the parameter of set_max_fanout?

[lee_polaris]

Hi:
I have known the function of set_max_fanout,but I don't understand how to confirm the parameter which following set_max_fanout.is this parameter determined according to target library. please help me!
thank you!

 

[srinivasan.s]

Hi,
parameter for the set_max_fanout is value and port or pin list, syntax set_max_fanout value port|pin list
but i hope so thats not your problem you need to know which port or pin need to be listed and why?
if its not please highlight your question

 

[rca]

You should not need to define this parameter if the library is correct. This parameter is already define in the liberty file.

 

[tangqin55]

The max_fanout is not defined in all .lib files I have.
I think those .lib files are correct.

 

[yadavvlsi]

Max fanout limit is used to avoid max cap violations. As far as you are not violating max cap limit, you need not to worry about max fanout.

 

[lee_polaris]

I want to use the set_max_fanout to constraint the fanout of the net in the internal circuit,but I still don't understand how to confirm the parameter of set_max_capacitance.I just want to know in which case use the set_max_fanout and set_max_capacitance.
thank you!