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pCell skill for beginners

stuso

Hi,

i'd like some advice for creating my first simple pCell from skill. I have no skill experience so i'm looking for a good place to start.

My ultimate aim (for now) is to create a rectangular via array with X and Y stretch handles. For example you have M1->M4(the top & bottom layers would be parameters) that you can stretch in X or Y and it fills with the max vias allowed by spacing rules. However to begin with i'd be happy to create a parameterised rectangle of M1 that i can stretch in one direction & take it from there.

Pointers to on-line tutorials and very simple examples would be great, right now i am blindly searching around source-link.

Thanks

Stu

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  • Andrew Beckett

    Hi Stuart,

    1. Simple way would be to add something like w=max(w 0.2) and l=max(l 0.2) (0.2 is just an example of a minimum) before the rodCreateRect. That would clip it to the minimum value.
    2. Surround the pcDefinePCell call in a procedure definition, and then load the SKILL code from a file called libInit.il in  the library that contains the pcell ("stu_test_skill" in this case).
      The reason for wrapping the pcDefinePCell is a procedure is that you don't want to redefine the pcell every time it gets loaded - just when you choose. By having the code loaded from libInit.il, it will get auto-loaded by PVS, by Virtuoso, for any user that references the library. If you put the code in the .cdsinit, it won't get picked up by PVS.

    Regards,

    Andrew.

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  • Andrew Beckett

    Hi Stuart,

    1. Simple way would be to add something like w=max(w 0.2) and l=max(l 0.2) (0.2 is just an example of a minimum) before the rodCreateRect. That would clip it to the minimum value.
    2. Surround the pcDefinePCell call in a procedure definition, and then load the SKILL code from a file called libInit.il in  the library that contains the pcell ("stu_test_skill" in this case).
      The reason for wrapping the pcDefinePCell is a procedure is that you don't want to redefine the pcell every time it gets loaded - just when you choose. By having the code loaded from libInit.il, it will get auto-loaded by PVS, by Virtuoso, for any user that references the library. If you put the code in the .cdsinit, it won't get picked up by PVS.

    Regards,

    Andrew.

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