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QRC Extraction

kaydense

Layout passed DRC and LVS checks Using Assura.

I want to do post layout simulation and there I have this error showing up when I try to extract the layout

ERROR (LBMISC-215479): at "Techgen -trans": Connect layer 'net_nwell' from lvsfile is declared as stamped layer in p2lvsfile. Please check the p2lvsfile.

I have checked the p2lvsfile inside Assura folder and there is the first line that states "pro_layer=fox  ext_layer=net_nwell,net_psub  other_ext_layer=pnpvert10_c  stamp=1 ;". I changed stamp=1 to 0, 2 but it still showed same error when I ran Assura QRC again. I guess it is because p2lvsfile is rewritten for each run (since the value goes back to stamp=1).

Directions on what to do would be great.

It extracted when I changed Output dropdwon in QRC form, from Extracted to Lvs Extracted View. I really don't know if this will affect the results of the post layout simulation.

I use Cadence Virtuoso Layout Suite version IC6.1.6-64b

  • Andrew Beckett

    You didn't say which QRC (EXT) version you're using. Looking through a few CCRs, this may have been fixed in EXT13.2 but let's see which version you're using. I don't think you should be editing the p2lvsfile with hindsight and checking a bit further. It might also have a dependency on the ASSURA version - which version are you using? (to get the versions, type "assura -W" and "qrc -version").

    Changing to LVS Extracted view is almost certainly not what you want. That won't contain any parasitics.

    Regards,

    Andrew.

  • kaydense
    Thank you Andrew.

    Problem resolved.

    It gave me that error message because when I did Assura -> LVS Run, I did not select "resimulate_extracted" for Set Switches.
  • Andrew Beckett

    There is no chance I ever would have been able to suggest that, because that switch is something defined in the particular LVS rule deck you're using. Many technologies don't require any switch settings in order to run LVS prior to QRC. If you'd have mentioned which technology you were using, maybe somebody might have known that and could have helped you out.

    Kindest Regards,

    Andrew.

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