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Misalignment of schematic while porting

garry01

When I am porting schematic library from x foundry to y foundry (for now assume all other instance properties like width length etc are same), there is misalignment so net connectivity is lost.

 For example if i have nmos in x foundry on converting to Y foundry it is getting shifted and rotated. So what is the best possible solution?

I was thinking about shifting and rotating the instances (mos,resistors etc) so that it comes to same position on porting  and then connecting the floating terminals to nearest wire if there is still any offset. Hopefully it should work. If yes then please let me know how to go about it . (i am pretty new to skill). 

  • Quek

    Hi Gary

    I think there is no easy solution to this problem. It is commonly encountered when migrating pdks from one foundry to another. The skillscript in COS article 20187499 connects schematic wires to the nearest pin or instance terminals. It might be useful for you.

    Best regards
    Quek

  • garry01

    Hi Andrew,

    I am looking at possibility of combining several such options.

    Please let me know if it is possible to make the symbolic view (since sizes and shapes vary) exactly same between 2 foundry taking source as one of them. If yes please let me know how.

    Thanks

     

     

  • Andrew Beckett

    I don't understand your question, sorry.

    Andrew.

  • garry01

    Suppose we have a nmos from x foundry library and we want to port it to y foundry, the size of nmos (or the symbolic view) is bigger than nmos of x foundry or for other instances (like egnfets) its smaller. So is there a way that we can do try to make the symbolic view of all such instances (mos,caps,res) in schematics same as x foundry so that we can be sure that shapes are exactly same (though there may be offsets).

    If it is unclear i can post some snapshot.

    Please do let me know.

     

    Thanks

     

  • Andrew Beckett

    If the symbols have the same pins, then there's nothing to stop you copying the symbol views of one PDK into the other. If the pins are different, you'd have to do more editing - but I see no reason why it should matter (other than it being a maintenance headache). Could be automated with some SKILL code reasonably easily.

    If no pins need changing, you could just use the "By View" tab of the Copy Wizard in the library manager to copy them all in one go.

    Regards,

    Andrew.

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