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Getting alt_symbols into existing design

aemeehan

We have a layout that is complete, but the footprints need to be changed to the alt_symbols called out in Orcad. Importing the netlist as usual leaves the existing footprints as they are. How can we tell it to replace the footprints with the alt_symbol without having to start all over with component placement? Thanks for any advice you can offer.

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  • mcatramb91

    Hi,

    You can switch to the ALT_SYMBOL for several components from Placement Edit Application mode.

     - RMB > Application Mode > Placement Edit
     - Hover over component and RMB > Alternate symbol > All instances > <alt symbol name>

    You can also window select a group of components and use the RMB to switch over to the alternate symbols based on the placed symbol name.

    Hope this helps,
    Mike Catrambone

  • excellon1
    in reply to mcatramb91

    Some elegant ways of accomplishing ALT_Symbol trade out in Allegro. This is great. Now to a caveat, if I use alt_symbols in capture how can you back annotate to capture to make the alt_symbol
    the primary symbol.

    There may be a way to do it, though it is not obvious. My thinking was that when I would back annotate from the board that had the alt_symbol instead of the primary used, capture would switch the
    alt to be the physical primary symbol. I guess the issue is that basically the board and schematic are out of sync with respect to primary footprints. How to resolve.

    Any thoughts ?

    Thanks

    Paul.

Reply
  • excellon1
    in reply to mcatramb91

    Some elegant ways of accomplishing ALT_Symbol trade out in Allegro. This is great. Now to a caveat, if I use alt_symbols in capture how can you back annotate to capture to make the alt_symbol
    the primary symbol.

    There may be a way to do it, though it is not obvious. My thinking was that when I would back annotate from the board that had the alt_symbol instead of the primary used, capture would switch the
    alt to be the physical primary symbol. I guess the issue is that basically the board and schematic are out of sync with respect to primary footprints. How to resolve.

    Any thoughts ?

    Thanks

    Paul.

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