fixing setup violation

[newebu]

Hi,
Is it true that replacing buffer with 2 inverter in datapath can fix setup violation ? If so please clarify

 

[rca]

Setup violation means not enought time for the data to respect the setup condition relative to the next clock edge.
If the delay due to the two inverters + routing is less than the delay due to the buffer, yes that could help to fix the setup violation.

 

[sohiljain]

Hi newebu,
Setup violation means due to greater delay in datapath,data cannot get set on the input of second flip flop when clk arrives (posedge or negedge) on its clk terminal.Hence for its removal you need to decrease the data path delay or inrease the clock path delay.So if delay of 2 inverters is less than buffer it can fix or decreasing the clock frequency also works.