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Constraints Manager, not sure how to define this constraint

likeabletom

Hi all,

I"m still coming to grips with the Constrains Manager and I've run into a constraints definition problem I cant wrap my head around.

I have a design that has a pair of nets (NetA and NetB) that between them use the Default Constraint set, but from them to the rest of the world requires 1500V creepage values.

I have defined a Spacing Constraints set, SCS_1500V which contains NetA and NetB, with creepage values suitable for 1500V.  The problem is, that the SCS_1500V is also applied between NetA and NetB producing a few hundred DRCs.

My question is, how do i define constraints that prevent the SCS_1500V rules applying between NetA and NetB, but continue to have the SCS_1500V between them and the rest of the world?

  • steve

    Try creating netclasses, put the nets into netclasses, you can then create rules from class to class that can be different between the classes. There's an overview video that should help www.youtube.com/watch

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