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Heads up Display

WallyWare

I'm trying to route some differential pairs in Allegro 17.4 and want to ensure my phase error is less than the specified MAX. Everything I'm reading and seeing online refers to a heads up display that shows my trace length differences as I route my net pair but I'm not seeing this. I'm also not seeing a dynamic phase column in the Electrical tab of the constraint manager. Do I need an add-on to do these things or have I failed to enable something?

  • steve
    0

    So this is available in OrCAD Professional and Allegro PCB Designer but not OrCAD Standard. If you have one of the first two licenses, make sure that you have rules defined in Constraint Manager and they are applied to the diff pair. Also make usre you are up to date in regard to software version. Latest one is 17.4-2019 S031 available from Download Manager or Cadence Online Support.

  • WallyWare
    0 in reply to Robert Finley

    I'm not sure where that is - here's what I do have:

    1) In my Design Workflow - Timing window, both Delay Tune and Timing Tune are greyed out.

    2) Under my Design Parameters - Route tab, I have a Delay Tune option that lets me set the style and allow DRCs 

    3)  And, under Analysis Modes - Electrical, All Differential Pair Checks is ON

  • WallyWare
    0 in reply to steve

    I suspect I just have ORCAD standard - your video was helpful though and I can use the table in the Electrical-Routing-Differential Pair to observe the effects of my tuning. Just wish I could see that little tuning window - it would save some time.

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