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 Generating LEF from layout view 

Last post Tue, Jun 12 2012 5:45 AM by Quek. 1 replies.
Started by BraveHeart 12 Jun 2012 04:22 AM. Topic has 1 replies and 2179 views
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  • Tue, Jun 12 2012 4:22 AM

    Generating LEF from layout view Reply

     Hi all!

    I have been trying to export LEF from standard cells layout in order to use that LEF file in Encounter for automatic PnR. From virtuoso I select File -> Export -> LEF and fill the form appropriately but the lefout.log is giving a warning on metal 4 as shown below:

    Warning (OALEFDEF-50144): NONDEFAULTRULE: VirtuosoDefaultExtractorSetup: Layer A4: invalid definition. This rule will be ignored. Ensure all layers in the valid routing layers constraints have a minWidth constraint defined and are metal or poly routing material.

    When I opened the lef file, it is missing REC and OBS statements etc and only gives 3 lines on origin,  foreign and size of the macro, e.g. OR gate. I am sure the lef is not being generated properly. Please guide me what am I missing here.

    Thanks for reading.

    • Post Points: 20
  • Tue, Jun 12 2012 5:45 AM

    • Quek
    • Top 10 Contributor
    • Joined on Wed, Oct 14 2009
    • Singapore, 00-SG
    • Posts 1,069
    • Points 16,275
    Re: Generating LEF from layout view Reply

    Hi BraveHeart

    It would be better if you use the abstract generator to first generate abstract views from your standard cell layout views and then export lef from the abstract views. There is a step-by-step tutorial in $CDSHOME/doc/abstract/abstract.pdf. Perhaps you can try it first.


    Best regards
    Quek

    • Post Points: 5
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Started by BraveHeart at 12 Jun 2012 04:22 AM. Topic has 1 replies.