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Trace length matching

Sagetech

I have three traces that need to be matched within a certain percent. ONE of these traces has a resistor inline. How do I combine the two nets that comprise the signal trace into something that CM can calculate the trace lengths and add them together for comparison to the other two? I have tried combining them into a net group and adding that to the match group but that doesn't seem to work.

I only have two traces to do this to and can easily just use the old calculator and add the two lengths together, but I thought there might be another way to have it calculated automatically.

Ver 16.6 latest SP

Thanks, 

Tom

  • steve

    add a default signal model to the resistor and then Allegro with auto create an xnet of the two nets either side of the resistor (one net combined). Watch https://www.youtube.com/watch?v=KLPfatmaxz0&t=13s

  • Sagetech
    in reply to steve

    As usual, great concise answers - thanks Steve!

    Tom

  • CadAce2K
    in reply to steve

    Hi Steve. Once I get the XNets created in CM, what constraints should I set to get the XNets to DRC correctly? I've got them set up, and values are being determined, but I don't get a 'RED' indicator when I analyze them. Something doesn't seem to be set correctly yet. Thanks.

  • steve
    in reply to CadAce2K

    Check Analyze - Analysis Modes - Electrical and make sure that the DRC s turned on. A big clue is that the Column header will have a Yellow background. If it does this means that the DRC mode in not enabled.

  • CadAce2K
    in reply to steve

    Bingo! Case solved. Thanks.

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