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Length match diff pair from pin to via

aricbeaver

Hello everyone,

Is it possible to length/propagation match traces from pin to via then via to pin? I know you can do the entire trace but there doesn't seem to be a way to do this without net scheduling. Any ideas?

Thx,

Aric

Parents
  • mcatramb91

    Hi,

    If you are talking about length matching between the two nets in the diff pair from Via transition back to the Pin than it is available in Allegro 17.2

    Static Phase Control at Via Transitions

    • Default Static Phase DRC calculates the phase length from the Receiver Pins back to its designated Driver Pins. When the static phase constraint value is exceeds a DRC marker is reported at the Driver Pin. A new optional behavior will now perform the static phase length calculations from each differential pair via transition back to its designated Driver Pins, and report a DRC marker when the constraint value is exceeded.

    Hope this helps,
    Mike Catrambone

Reply
  • mcatramb91

    Hi,

    If you are talking about length matching between the two nets in the diff pair from Via transition back to the Pin than it is available in Allegro 17.2

    Static Phase Control at Via Transitions

    • Default Static Phase DRC calculates the phase length from the Receiver Pins back to its designated Driver Pins. When the static phase constraint value is exceeds a DRC marker is reported at the Driver Pin. A new optional behavior will now perform the static phase length calculations from each differential pair via transition back to its designated Driver Pins, and report a DRC marker when the constraint value is exceeded.

    Hope this helps,
    Mike Catrambone

Children
  • aricbeaver
    in reply to mcatramb91

    Hey Mike, what license has this option? I can't seem to find it using PCB Editor with the High-speed option.This is more along the lines of what I am looking. Do you know if it can be accomplished per diff pair not cross diff pair? Thanks!

  • mcatramb91
    in reply to aricbeaver

    Hi,

    It is available in Allegro 17.2 using the High Speed option but it was released back in August 2017.  If you don't see it than I would update to the latest ISR to gain access to the functionality. Once the behavior is enabled under Constraint Modes all Diff Pairs will start checking phase at each Via Transition inside of the same diff pair only.

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