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 Enable DRC By-Layer on Same net spacing constraints 

Last post Fri, Nov 30 2012 12:12 PM by Mstrghettorigg. 5 replies.
Started by Mstrghettorigg 29 Nov 2012 02:28 PM. Topic has 5 replies and 1340 views
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  • Thu, Nov 29 2012 2:28 PM

    Enable DRC By-Layer on Same net spacing constraints Reply

    Hello all,

    Can anyone tell me how to turn on the "Enable DRC By-Layer" in the same net spacing constraints tab under all layers-->all?

    Thank you in advance! 

    • Post Points: 20
  • Fri, Nov 30 2012 3:44 AM

    • oldmouldy
    • Top 10 Contributor
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    • Woking, Surrey
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    Re: Enable DRC By-Layer on Same net spacing constraints Reply
    You need the Options entry in Same Net Spacing, you can only change this setting there.
    • Post Points: 20
  • Fri, Nov 30 2012 7:06 AM

    Re: Enable DRC By-Layer on Same net spacing constraints Reply

    Hi Oldmouldy, 

    Could you explain what you mean by options entry?

    Are you saying that this can't be changed via skill?

    Thank you for your help!

    • Post Points: 35
  • Fri, Nov 30 2012 11:20 AM

    • oldmouldy
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    Re: Enable DRC By-Layer on Same net spacing constraints Reply
    Apologies, I answered this without realising it was within the SKILL forum and gave the UI answer! Anyway, Properties assigned to the nets control this, I attached the "Options>Enable DRC by Layer" to some nets and they get a property of "SAME_NET=TRUE" assigned, so this is the property that you need to attach to the NET through SKILL. The same property would be assigned to the Constraint Set in my humble if you are going down the SN Constraint Set and Net / Class assignment in your SKILL code.
    • Post Points: 5
  • Fri, Nov 30 2012 11:30 AM

    • fxffxf
    • Top 25 Contributor
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    Re: Enable DRC By-Layer on Same net spacing constraints Reply

     Could you explain what you mean by options entry?

    You have the ability enable same net check by layer on a per cset basis. In Constraint Manager, open the Same Net Spacing Constraint -> Options worksheet to acces this option.

     Are you saying that this can't be changed via skill?

    While you can set the SAME_NET property at the net level this takes precedence and enables same net checks for all layers for each net with the property. Normally you will want to set this option in Same Net Spacing csets.This allows for same net checking on same layers but not others.

    In Skill to turn on the option for all csets and all layers do (see the Allegro Skill doc for more options):

         axlCNSSetSameNet(nil nil 'same_net t)

    • Post Points: 20
  • Fri, Nov 30 2012 12:12 PM

    Re: Enable DRC By-Layer on Same net spacing constraints Reply

    Hello oldmouldy and fxffxf,

    With you guys help I was able to get the result I was looking for.

    Thank you for the help guys! 

    • Post Points: 5
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Started by Mstrghettorigg at 29 Nov 2012 02:28 PM. Topic has 5 replies.