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 Constraint Manager - Diff Pair (Cadence 16.2) 

Last post Sat, Mar 13 2010 3:07 AM by gchrisdesign. 3 replies.
Started by mike78 13 Mar 2010 02:02 AM. Topic has 3 replies and 2253 views
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  • Sat, Mar 13 2010 2:02 AM

    • mike78
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    • Joined on Sat, Jan 30 2010
    • Posts 2
    • Points 40
    Constraint Manager - Diff Pair (Cadence 16.2) Reply

    Does anyone have a good explanation on setting up constraints for diff pair to pair spacing using Allegro PCB Design XL version 16.2? I am having trouble getting the minimum line spacing set in physical constraint to override the line to line spacing set in the net class-class.

    • Post Points: 20
  • Sat, Mar 13 2010 2:47 AM

    • gchrisdesign
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    • San Diego, CA
    • Posts 5
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    Re: Constraint Manager - Diff Pair (Cadence 16.2) Reply

     "I am having trouble getting the minimum line spacing set in physical constraint"  ...do you mean Spacing Contraint?

    You want to create a Line to Line diffpair to Default nets and diffpair to diffpair ? 

    Have you created a Class CSet ? and added the diff pairs to that set?

    Under net Class-Class change the Line to Line

    • Post Points: 20
  • Sat, Mar 13 2010 3:03 AM

    • mike78
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    RE: Constraint Manager - Diff Pair (Cadence 16.2) Reply
    Just as I asked the question, I found the solution in the Cadence online help. Solution ID: 11542148 Titled: “Differential Pair line to line drc ignoring Min Line Spacing”. I needed to go into Setup > Constraints > Modes. In the Spacing tab turn off line to line spacing DRC check and apply then turn on line to line spacing on and OK. After that the DRC would not give me line to line spacing errors based on the line to line spacing set in the Net-Class-Class for the diff pairs. The min. line spacing value set in the diff. pair physical cset now overrides the Net-Class-Class line to line spacing.

    Regards,

    Mike Tombrinck
    • Post Points: 20
  • Sat, Mar 13 2010 3:07 AM

    • gchrisdesign
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    • Joined on Wed, Sep 2 2009
    • San Diego, CA
    • Posts 5
    • Points 55
    Re: RE: Constraint Manager - Diff Pair (Cadence 16.2) Reply

    It was so much easier in 15.5... 

    • Post Points: 5
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Started by mike78 at 13 Mar 2010 02:02 AM. Topic has 3 replies.