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Ques.regarding setup fixing?

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fail1

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How changing the driver cell can help fix the setup?
Also, why should we change the driver strength of the cells which has cross talk effects to fix setup?
 

sekapr

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you get setup violation when the delay through the datapath is more than the clock path. Increasing drive strength reduces delay
 

onlymusic16

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Initially it helps but after a point, upsizing actually degrades the delay since the gate cap of the increased driver also gets counted in.
 

lakshman.ar

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the cell with a higher strength propagates the signal faster, cos of bigger size ( correct me if i am wrong)

so since in the setup chk, u always chk for the data to arrvive well b4 clk ... replacing the cell with a higher drive strength actually propagates the signal faster .... hence u can meet the setup time !!!

WBR
lakshman
 

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In fact, driver signal speed depend on Voltage, R and C so adjusting them in order to fix delays.
 

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