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 SPEF differ between timeDesign and extractRC 

Last post Fri, Mar 8 2013 12:54 PM by Kari. 3 replies.
Started by steven2012 10 Dec 2012 10:18 PM. Topic has 3 replies and 1299 views
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  • Mon, Dec 10 2012 10:18 PM

    • steven2012
    • Not Ranked
    • Joined on Tue, Dec 11 2012
    • Posts 2
    • Points 40
    SPEF differ between timeDesign and extractRC Reply

    Hi Bob & Kari 

    I did the following things,why the spef from "timeDesign -signoff -si" is different to the spef from "extractRC".

    1. spef_01.spef.gz (one way)

    setExtractRCMode -engine postRoute -effortLevel signoff -coupled true -lefTechFileMap qrc.layermap

    timeDesign -signoff -si

    so,the spef file "spef_01.spef.gz" will be extracted.

     2. spef_02.spef.gz (another way)

    setExtractRCMode -engine postRoute -effortLevel signoff -coupled true -lefTechFileMap qrc.layermap

    extractRC

    so,the spef file "spef_02.spef.gz" will be extracted.

    but,why there are slight difference between "spef_01.spef.gz" and "spef_02.spef.gz" and which is more suitable to use?

    Thanks advance!

    Best Regards.

    • Post Points: 20
  • Wed, Feb 27 2013 7:14 AM

    • Kari
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Cary, NC
    • Posts 693
    • Points 14,295
    Re: SPEF differ between timeDesign and extractRC Reply
    your second way does not include the SI analysis.
    • Post Points: 20
  • Thu, Feb 28 2013 5:03 PM

    • steven2012
    • Not Ranked
    • Joined on Tue, Dec 11 2012
    • Posts 2
    • Points 40
    Re: SPEF differ between timeDesign and extractRC Reply

    Hi Kari

    Thank you for reply.I think the option "-couple true" will force the command extractRC to

    extract the si spef.

    so,in my opinion the above two spef should be same,however there are subtle differences between them.

    • Post Points: 20
  • Fri, Mar 8 2013 12:54 PM

    • Kari
    • Top 10 Contributor
    • Joined on Tue, Jul 15 2008
    • Cary, NC
    • Posts 693
    • Points 14,295
    Re: SPEF differ between timeDesign and extractRC Reply
    My guess is that timeDesign -si triggers some other extraction variables/thresholds/etc. to be set, causing the small differences. But as I said that is a guess. If your flow is dependent on this, I would suggest filling a service request.
    • Post Points: 5
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Started by steven2012 at 10 Dec 2012 10:18 PM. Topic has 3 replies.