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 Instance Padding  

Last post Thu, Jan 31 2013 6:36 AM by BobD. 3 replies.
Started by victory2vicky 29 Jan 2013 08:49 PM. Topic has 3 replies and 860 views
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  • Tue, Jan 29 2013 8:49 PM

    Instance Padding Reply

     Hi All ,

    Can any one suggest me how should i specify instance padding  i am using following commands but by executing these , specified padding is not appllied for the instance after placement.

    specifyInstPad <instancename> 2

    placeDesign.

    • Post Points: 20
  • Wed, Jan 30 2013 6:24 AM

    • BobD
    • Top 25 Contributor
    • Joined on Fri, Jul 11 2008
    • Chelmsford, MA
    • Posts 247
    • Points 9,325
    Re: Instance Padding Reply

    By "not applied" do you mean you suspect the directive is being silently disregarded by the placer? Or the placer isn't honoring your request as judged by visual inspection?

    If you suspect it's being silently disregarded check the value with "reportInstPad" to make sure the padding you requested is still there.

    If you suspect the placer isn't honoring your constraints, consider a few things:

    • The value is specified in placement site units
    • The padding isn't guaranteed to occur on a specific side of a given instance
    • You can see what the unit size looks like visually compared to the cells by turning on placemen site visibility: All Colors->View Only->Row Site Pattern 

    I suspect that the value of "2" is just really small. Try a larger value, like one which equates to 50-100% the size of the instance you want padded.
     
    Hope this helps,
    Bob 

     

    • Post Points: 20
  • Wed, Jan 30 2013 7:50 PM

    Re: Instance Padding Reply

    Thanks BobD for your valid information.

    reportInstPad is still giving the instances for which i applied padding , but after placement i am not able to visually observing the padding in any side of the instance ,  i tried with larger value of padding also but visually i am not able to see the padding. what might be the reason?

     

    • Post Points: 20
  • Thu, Jan 31 2013 6:36 AM

    • BobD
    • Top 25 Contributor
    • Joined on Fri, Jul 11 2008
    • Chelmsford, MA
    • Posts 247
    • Points 9,325
    Re: Instance Padding Reply

    Hmm. I'd suspect one of 2 things. Either the overall density is so high that the padding can't be honored. Or that some other placement setting is taking precedence over the instance padding. If the overall density is moderate (<95%) I'd try an experiment where I cleared out all non-default placement settings (setPlaceMode -reset), applied the instance padding, and ran a simple placeDesign. Let us know what you find! Sounds like an interesting puzzler.

    PS You're always free to file a service request and if you can provide a testcase we'll be able to pin it down. Thanks for using the forums!

    • Post Points: 5
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Started by victory2vicky at 29 Jan 2013 08:49 PM. Topic has 3 replies.