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How to verify LEF vs GDS

noramirkh

Dear forum,

I would like to know how I should verify LEF vs GDS to make sure LEF is really synced with the GDS? What Cadence tools do I need to use?

Is there any recommended flow for this?

Thanks,

Norayr Amirkhanyan

  • Usually the LEF is an abstract, so not sure you’d want to compare it against the GDS (the abstract would not be the same as the layout in that case, because it would be focusing on the pins, blockages etc). I’m not sure I’ve come across anyone trying to do this, but I guess you could use Import LEF in Virtuoso and then stream it out, and then do an XOR comparison in a physical verification tool (e.g. PVS) to compare the GDS and one generated by import LEF then export Stream.

    Regards,

    Andrew

  • in reply to Andrew Beckett

    Hi Andrew,

    Thank you so much for your response. 

    What I am really up to is to understand to what extent it is possible to cross check LEF and GDS using automation. 

    I can check pin names, but that seems really basic cross check if I do that only. 

    What extent of consistency between LEF and GDS would be checked using your proposal. 

    Thanks

    Norayr Amirkhanyan

  • in reply to noramirkh

    There isn't really anything in Virtuoso to do this (as far as I know). Given that the LEF is an abstracted representation (usually) of the layout, you'd probably need to regenerate the abstract using the abstract generator and then you could compare that somehow using XOR.

    There is this article that might help at least do a partial consistency check: SKILL script to compare pins in LEF/GDS files

    Andrew.

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