Causes for UO faults in ATPG

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ranger01

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Hello DFT experts,

UO faults are faults which are not observed at the POs. What could be the possible causes for this category of faults ? When I run analyze_faults on a UO fault in mentor, it is detected successfully, however I do not understand why it wasn't put under DI/DS bucket.
 

you're PO always drive the same value?
or do you mean the PO is not connected to the internal scan chain and so the scan out does change?
 

I just defined UO faults in my question. The issue is with the tool. I had to re-target only the UO faults to detect them with higher abort.
 

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