Forum › Category: Layout › In A Reg to Reg Path If You Have Setup Problem Where Will You Insert Buffer-Near to Launching Flop or Capture Flop? Why?
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AvatarCircuitDesigner asked 2 months ago
For a setup problem in a reg-to-reg path, the best approach is to insert the buffer near the launching flop.  
1 Answers
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Avatarsemiconductor answered 2 months ago

Reason: Inserting the buffer near the launching flop delays the clock signal to the launching flip-flop, effectively increasing the available time for the signal to propagate and meet the setup requirement at the capture flip-flop. This helps in resolving the setup timing issue.

Placing the buffer near the capture flop would increase the clock delay at the capture end, worsening the setup problem.