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Differential pair width in allegro PCB editor

rinj

Tool: Allegro PCB Performance option L Ver16.1

Dear all,

eg:I set net width for a differential net +X to 15mil, and maintain width for net -X as 8 mil in the constraint manager. But while routing the  -X net's with is automatically changing to 15 mil, same as +X and the change is not showing in the constraint manager.

Is it bcz the tool is automatically default set to maintain same with for diff nets?

thanks

rinj

  • redwire

     Yes, the diff pair engine expects like widths.

    I am very curious to know why you want to do line widths like this for diff pairs?

    You can remove the diff pair prop and instead route as a matched pair and then it doesn't care about width.

  • rinj

    Thank you redwire, for your comments for both of my posts. I was trying to help my colleague.

    we were just trying "width changes". Then we noticed that particular property, that's all.

    rinj

  • Javinder

     Idon't know if you have solved this. but one way to solve this,is to set MAX LINE WIDTH on each net and then route it as a group. Then it behaves like a diff pair. You can change the isolation by right click.

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