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ANNOTATING A SCHEMATIC

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I am a new user of the Allegro tools. I am almost finished with my design and I want to renumber the schematic so that the RefDes' are in sequence. I can annotate the schematic without any problems, but when I import the logic into PCB Editor I get errors and all of the components become unplaced. What is the process of annotating a schematic in Allegro DE CIS and then importing that into Allegro PCB Editor?

  • AshVarma

    Hi pcbrob,

    Please post this question to the PCB Design forum
    (http://www.cadence.com/community/forums/27.aspx) as the System Design
    and Verification forum is meant to discuss high level system design and
    verification topics.

    -ashutosh

  • oldmouldy

    In the DE CIS <> PCB Editor flow, the Reference Designator is THE property that connects the schematic and the physical designs, so re-ordering the schematic references will break the link - the component references will have different net connections and the components will be unpplaced from the board.

    You may be able to ... manually change the references, note that duplicates are not allowed, this could be a lot of work.

    If you have the "before" and "after" versions of the board, you could export the placement from the "before" version, edit the placement text file to reflect the reference changes and then import the modified plament text file into the "after" version.

    Being able to freely renumber the schematiic would require that the products were changed to use an independent property value to link the schematic and physical designs.

  • redwire

     Flow is OrCAD->Allegro->OrCAD

     Renumber your components in Allegro (very quick and easy), then backannotate to the schematic.  NEVER reassign components in the schematic once you've placed them in Allegro.

     

     

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