Nov 25, 2012 #1 ivlsi Advanced Member level 3 Joined Feb 17, 2012 Messages 883 Helped 17 Reputation 32 Reaction score 16 Trophy points 1,298 Activity points 6,868 Hi All, As for DRC, why both Fanout & Capacitance Constraints are needed? Isn't enough have just one of them? Thank you!
Hi All, As for DRC, why both Fanout & Capacitance Constraints are needed? Isn't enough have just one of them? Thank you!
Nov 25, 2012 #2 R rca Advanced Member level 5 Joined May 20, 2010 Messages 1,527 Helped 355 Reputation 710 Reaction score 336 Trophy points 1,363 Location Marin Activity points 8,773 Capacitance is required to respect liberty timing. Fanout is not mandatory to be respected as timing but it could be needed as company rule, like tie cell.
Capacitance is required to respect liberty timing. Fanout is not mandatory to be respected as timing but it could be needed as company rule, like tie cell.
Nov 25, 2012 #3 ivlsi Advanced Member level 3 Joined Feb 17, 2012 Messages 883 Helped 17 Reputation 32 Reaction score 16 Trophy points 1,298 Activity points 6,868 sure rca! the max fanout also make a limit for the current driven into output stage of the driving cell (IMHO)
sure rca! the max fanout also make a limit for the current driven into output stage of the driving cell (IMHO)