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What is Tranisition Delay and Path Delay Fault models in DFT ATPG?

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Nanda_DFT

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Can I get the difference between TDF and PDF models in DFT ATPG
 

Transition faults are faults located at precise pins. The atpg engine will choose whatever convenient path to cover the transition fault(s) to be tested, often the shortest path.
For Path delay faults, each fault is described as a list of pins where the transition from the launch point to the capture point is described.That forces the ATPG to use that path. You often get this paths from the STA team.
 

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