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Netlisting of post-layout simulation is very slow

ernie123

Hello, I have run Assura QRC on my layout, and obtained an av_extracted view for post-layout simulation.

Unfortunately, when I change my top-level cell view to av_extracted in the config file for the simulation, and I do Netlist&Run in ADE L, the netlister seems to work very slowly.

It prints "generate netlist..." in the CIW, and the progress bar moves by 1% in around 5 min, so at this rate I will need to wait 8 hours before netlisting is done. That is before the actual simulation, so I am even more worried about the time it will take for the actual simulation...

My design is not very complex (it's like maximum 10 transistors, two capacitors, padframe, a few resistors). I assume that people with far more complicated designs would take even longer to netlist, which seems impractical. This is why I am wondering if there isn't some setting I am not using correctly, or if there is a bug in the netlister. The size of my av_extracted view is around 50 MB, is that considered too large for the netlister?

Perhaps it could be helpful if I have access to an ongoing logfile for the netlister, but I am not sure where the netlister outputs or logs anything during progress. The CIW does not seem to update itself, and I cannot click on the ADE GUI while the netlister is running (the mouse turns into the spinning icon).

My software version is Virtuoso 6.1.5-64b.

Thanks for any help and suggestions.

  • Andrew Beckett

    This seems very odd - I wouldn't expect it to be that slow (by a long way). People have much larger extracted views that don't take anywhere near that long.

    Maybe there was a bug in the rather old version you're using? Even the final hotfix for IC615 was almost 6 years ago - can you try with a recent version? IC617 hotfix or IC618? We do also have a new capability in IC618/EXT182 called "smart view" which will have much faster creation and netlisting performance, but I really doubt you should need to use that for such a small extraction.

    If after trying the latest versions you still have an issue, you should contact customer support so that we can take a look.

    Regards,

    Andrew

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