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OrCAD16.6 DRC check problem: "Net has two or more aliases"

Hossein1357

Hi,

I have used net names of my power symbols for various pins. Running DRC I see below messages. How can I get rid of such messaes?

INFO(ORCAP-2212): Check Power Ground Mismatch
QUESTION(ORCAP-1589): Net has two or more aliases - possible short? U18,PVIN  PVIN  DDR1V8
                    SCHEMATIC1, 05-DDR2 & GP Flash  (106.68, 185.42)
QUESTION(ORCAP-1589): Net has two or more aliases - possible short? U18,VDDQ  VDDQ  DDR1V8
                    SCHEMATIC1, 05-DDR2 & GP Flash  (106.68, 175.26)
QUESTION(ORCAP-1589): Net has two or more aliases - possible short? U16,VDD  VDD  DDR1V8
                    SCHEMATIC1, 05-DDR2 & GP Flash  (241.30, 22.86)
QUESTION(ORCAP-1589): Net has two or more aliases - possible short? U16,VDD  VDD  DDR1V8
                    SCHEMATIC1, 05-DDR2 & GP Flash  (243.84, 22.86)

Any comment would be appreciated.

Thanks in advance,

Hossein

  • Dhamodharann
    Check the ground and power connections with the reference designators.After run the DRC check.
  • Hossein1357

    I have checked it many times. There is no mistake with the Schematic. I have some parts with various power pin names(VDDQ, PVIN,..) :accordingly, I made my part pins. I have to use a one power label for these pins and here the problem arises, when I run Physical check in DRC it displays those mentioned messages, Hope it makes sense!.

    Hossein,

  • tltoth

     Try to use Edit->Browse->Nets to see how many aliases your nets have

  • francomaggi

    I also have this problem and I do not see any issue with my design either.

    Browsing the DRC, I see other names have been attached to the concerned power nets. Those "alternative" and confusing aliases that trig errors reflect power pin names.

    My feeling is that, whenever OrCAD finds a power port, it attaches a tag to the power net it connects to or, better, it tries to rename the power network with pin names, generating more than one net aliases. Later, when running DRC, it will complain about this.

    Is my suspect correct? How do I eventually remove this annoying option?

  • steve
    More than likely you have connected the power symbols to an off page connector or hierarchical port. If you do this then that "wins" in the net naming so whatever that port is called higher up the hierarchy becomes the power net name. Take a look at orcad.co.uk/.../Capture_Power_Nets_Usage.pdf which will give you details of how this all works.
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