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Assura LVS errors

RFStuff

 Dear All,

 We are switchig to ASSURA (sub-version 4.1_USR4_HF3) from CALIBR.

But we are seeing following errors in LVS log file. These errors were NOT shown by CALIBRE.

1:-
Executing: nnbdif = geomButtOnly(nsd ptap diffNet)
errorLayer(nnbdif " nsd/ptap butting issue: nsd/ptap need to be connected by metal and contact")

2:-
Executing: ppbdif = geomButtOnly(psd ntap diffNet)
errorLayer(ppbdif " psd/ntap butting issue: psd/ntap need to be connected by metal and contact")

3:-
Executing: ptap99 = geomAvoiding(geomGetNet(ptap PWR1 PWR2) geomOr(CSYMBOL DSYMBOL BJTSY...
errorLayer(ptap99 "ptap is wrongly connected to POWER ! ")
4:-
Executing: ntap99 = geomAvoiding(geomGetNet(ntap GND1 GND2) geomOr(CSYMBOL DSYMBOL BJTSY...
errorLayer(ntap99 "ntap is wrongly connected to GROUND ! ")

 

Can anybody please tell what are the causes of these errors.

 

Kind Regatrds,

  • Given that these will be specific to the particular rules you're using, it's hard to know precisely what the issue is and why there is a discrepancy. I'm sure there's a difference in the implementation of the two rule sets for the two different tools, and you'd have to ask the foundry that provided the rules for guidance about the discrepancy.

    I would however check the errors because it would appear that it thinks there is some issue with your well and substrate taps.

    Other than that, giving advice here without being able to see the layout or knowing the precise rule deck you're using is going to be pretty hard!

    Regards,

    Andrew.

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