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PVS LVS Deck behaviour

Suryansh Singh

Hi ,

I had a question regarding PVS LVS rules writing behavior. I have a deck from foundry which has some code in the following manner :

not A B -output A1

not A B -output A2 

not A B -output A3 

i.e. same layers with same operation resulting in three different output layers. I ran LVS with Layer viewer and I can see only the A1 layer in the layer viewer. 

Now my question is why I do not see A2 and A3? Could it somehow be dependent on operations that happen next  on A1,A2 and A3? Would this also happen if the operation was something else (like AND)? 

Regards

Suryansh Singh

  • Andrew Beckett

    Hi Suryansh,

    I've not done detailed checking on what happens with PVS rule optimisation, but it wouldn't surprise me if it optimised away the operations if the results are not used. Did you check to see if A2 and A3 are used? This may be best followed up with customer support so that we can see your actual rules in operation. I don't think it's anything to do with the operation used (i.e. AND rather than NOT).

    Andrew.

  • Suryansh Singh
    in reply to Andrew Beckett

    Thanks Andrew

    I will explore a bit about PVS rule optimization and see if that answers my questions completely.

    Regards

    Suryansh Singh

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