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Guidance in finding the Replace/Change Via Mode Functionality

Roger BFS

I've stumbled into a rather dense board layout with several painfully placed via fanouts in place. I now need to replace the vias with slightly smaller padstacks due to density and spacing issues.

I can not locate the mode/function to interactively change the via padstacks on the already placed and routed fanouts! I have found references to such a mode and operation in user guides, but none apparently work for the PCB editor (apparently only the router).  I DO NOT want to spend hours painfully deleting and re-doing the fanouts to get smaller via padstack selections. None of the "mode change_via" commands appear to work.

I'm running Allegro "Performance" Editor 16.6 hotfix 64.  If anyone can educate me on how to "change vias" I would be extremely grateful.  (Yes, I've "unfixed" the via fanouts that get implemented by default,. so I can manually slide and edit the traces one by one. I've also edited the CM to allow smaller via padstacks and such).

Thanks in advance!

  • oldmouldy
    It's possible that the "created fanout" is "marked", try Route>Convert Fanout>Unmark, and select the fanout to unmark - you could "window" the board for "everything". Then you should be able to replace the Vias.
  • mcatramb91
    Hello,
    In General Application mode you have the ability to drag window select that pads and perform a padstack replacement.

    No need to go into any command just follow these steps:
    - Ensure you are in General Edit Application Mode (RMB > Application Mode > General Edit)
    - Window Select the padstacks you would like to replace.
    - Hover over one of the selected padstacks and RMB > Replace padstack > Selected instance(s)
    - Select new padstack from the dialog and click OK.

    This will replace the selected padstacks with the new padstack.

    Hope this helps,
    Mike Catrambone
  • Roger BFS
    Thanks fellows, got me there! Only been using Allegro for around 10 yrs, so still learning <grin>.
  • redwire
    Also, go to the menu Tools->Padstack Replace

    Select "single via replace" and select the existing via then choose its replacement from the pulldown. There are several more options available in the options panel to go explore.

    This is the method I always use for what you are doing. RMB works but I'm too old to learn it :)
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