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How to indicate off-board connections in LAYOUT

ac9ts

I'm designing a daughter board using OrCad Layout (old, I know). The board has 2 40 pin connectors at opposite ends. Both connectors have VCC net connections to the main board. The main board has the power supply and supplies VCC to multiple pins on each connector. I routed the board to use the closest VCC pin on a connector.

The issue I am having is that when I check connectivity, it shows all the VCC pins on each connector not being connected to each other as they are actually connected together on the main board. Short term, I added routes to all the VCC pins between the 2 connectors so I can check to see if I'm missing any other connections. I would rather not leave the connections there.

The question: Is there a way to indicate that multiple pins are connected externally from the PCB so Layout doesn't show them as being disconnected?

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  • in reply to avant

    But I want the connections. I'm trying to find a way to indicate the connections are made off the PCB. I don't want to run a VCC trace all around the board to satisfy the PCB net connectivity when I know the VCC pins on the connectors are all connected externally.

  • in reply to ac9ts

    Classic - Make one net VCC1 and the other VCC2, and on the schematic place a NOTE saying in essence - "VCC1/VCC2 are common VCC. This connection is intended for an external power supply (+5V, or whatever your VCC voltage is)"

  • in reply to CadAce2K

    I was thinking along those line as well. The issues that I see are:

    1) VCC comes in, basically, on the 4 corners of the PCB. I had a general idea how I wanted to lay the board out but the VCC source might change from what I thought to what I end up with. A lot of back and forth net changing.

    2) It's a single voltage design so I used symbols with the power pins hidden. I would need to edit each symbol to make them visible.

  • in reply to ac9ts

    That's fine. Use LDOs at each corner instead too.  :)

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