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asign a net name to a dummy net

Kennn

I am a new user of Allegro PCB editor of OrCAD 16.2. I want to modify an existed PCB design (*.brd). I add a set of new connect pins and want to assign nets to that pins (dummy nets). Question is I do not know how to do it.

I read someone's suggestion is utilizing "Net Logic" on Logic menu. But I not found "Net Logic" on Logic menu. There are only "Identify DC Nets", "Assign EefDes", and "Auto Refdes".

I was stopped there, please giving me a clear method to solve it. Thank you!!

  • Kennn

    Thank you very much for the kindly response. I would like to try your suggestion. Best

  • R Gibson

    I have a similar problem...OrCAD is extremely un-intuitive...

    I have a net (contains both a shape and a trace) that have becomed orphaned. They currently are labeled as "dummy net." I don't want to have to delete them and re-draw them...I simply want to assign a net to them. This seems like such an easy task, and yet OrCAD doesn't seem to offer this capability...?

    In answer to some of the above responses, I have a full-blown licence to this software...this isn't an eval version or something.

    IMO, there should be either a right-click menu item called "assign net" or an "options window" field to assign a net when in the "change" command...but neither seem to exist.

  • redwire

     Cadence has always had a top-down design flow.  That means you can't start at the pcb and start connecting to make their flow work.  Other tools in the industry have no policing of the flow and you can end up with arbitrary connections.

    Modify your schematic (or netlist) and Allegro/OrCAD PCB will happily connect the missing pins.

    There are other discussed back-door solutions in this thread but none of them are as simple as doing it right.

  • Afgncaap
    OK, my response may be a bit late in this, but I figured out how to do at least some of what you want to do: If you want to assign a net to a SHAPE, this can be done but it is not intuitive. I first discovered that under the Shape menu, there is an option called "Edit Boundary." When you select a shape with this command and right click, there is the option to "Assign Net." THIS DOES NOT WORK. It will claim to work, and then still fail. Instead, deselect your shape and go to the Shape menu. Choose "Select Shape or Void" and then select your shape. If you do this, all of the vertices in the shape should get little boxes (so this is really handy if you want to change the shape, too). Go to the Options tab on the right side and choose the desired net from the drop down menu. Now right click on the shape and the "Assign Net" option will work. Hope this helps you. This was the only way I could find to get an odd shaped ground plane and have the power plane underneath it be shaped the same (without redrawing the whole thing).
  • EvanShultz

     If I have Cline with no connectivity, so the net is "Dummy net", I can simply connect to the Cline with another Cline or else draw from the orphaned Cline (use "add connect" mode) and connect the orphaned Cline to some element with net connectivity. Allegro figures out the rest. If you bring a Cline with connectivity to you orphaned Cline, you may have to "chase" the orphaned Cline back to a vertex, but it works for me.

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