Coverage improvement from AU.TC faults

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aakashaspires

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I am losing around 38% of my test coverage due to Black Box (11.60%) and Tied Cells (26.56%). I have traced back all the AU.TC faults in the schematic but couldn't found any missing instance that I van add in the netlist and improve the coverage.

Kindly help me with the solution especially for Tied cells, how can I improve the coverage from that?

Thanks,
Akash
 

can you clarify what do you mean by 'tied cells'? are you referring to tie high/tie low cells?
 
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