Creating layout pin, where do "pin name" go in GDS out?

Discussion in 'Cadence' started by Reotaro Hashemoto, Jun 24, 2009.

  1. Hi,

    When I create a layout in Cadence, and place a pin giving it a name
    (e.g. VCO_CT) then making stream out for the layout as a GDS, where
    should this "pin name" appear in the GDS? In other words, will it be
    converted to label from a text layer in the GDS?

    Also, how will the LVS decide if the pin is correctly attached to the
    required layer....?

    I am quite confused about that concept!

    Thanks for any comments...

    Best regards,
    Ahmad
     
    Reotaro Hashemoto, Jun 24, 2009
    #1
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  2. Reotaro Hashemoto

    Riad KACED Guest

    Assalamou Alaikoum Ahmad,

    The GDS files retains the physical information only. All the logical
    information, like a pin name would not be translated into your GDS.
    If you are using Calibre for example, usually we put a label a in
    'pin' purpose on the 'drawing' purpose of the same metal. This is not
    a rule, this is what you may define in your Calibre deck. So to answer
    your 2nd question, the LVS does decide upon what you have written in
    your deck, i.e which layer do you attach to what metal. In Calibre one
    could attach a text layer on a metal and then define a port on that
    layer. All this is very detailed in Calibre docs.

    Cheers,
    Riad.
     
    Riad KACED, Jun 24, 2009
    #2
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  3. Reotaro Hashemoto

    Riad KACED Guest

    A quick thought ...

    You could view/check the content of your file using a GDS viewer. I
    would recommend Calibre DesignRev (calibredrv). Otherwise, you could
    use one of the various tools available from the www. I quite like the
    Java application from http://www.owlvision.org/ You use to save your
    GDS as ASCII which might be handy in some cases.

    Cheers,
    Riad.
     
    Riad KACED, Jun 24, 2009
    #3
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