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Any option in VLS to save one particular layer in hierarchy to a new view?

ssram

Hi,

I've a layout which has hierarchies and groups in it. I need to save one particular layer or couple of layers selectively to a new view/cell. For example, I've got Matal5 in different hierarchies and groups and VIAs. I need to save just Metal5 to a new view/cell. How do i do this? The easiest method for me would be to do some kind of operation when i've only the intended layers made selectable/visible in the LSW. I do not want to flatten the whole hierarchy/group/VIA manually since its a really complex layout with too many of them.

Thanks

Sooraj

Parents
  • Andrew Beckett

    Hi Sooraj,

    There are various articles on Cadence Online Support to allow you to do this kind of thing. Currently there's no built-in UI to do this because it's a relatively unusual request - but easy enough to write SKILL.

    In IC617/ICADV122 there are some new SKILL APIs (the "abe" functions (Advanced Boolean Engine)) which will make this much easier and more performant, however, be cautious about using them until about IC617 ISR5 since the arguments are changing slightly as they settle down,

    Before that you can take a look at this article.

    Regards,

    Andrew.

  • shlomo34
    in reply to Andrew Beckett

    Hi, I am currently having the same issue. From your answer it sounds like the methodology was a work in progress 6 years ago - what is the best method right now?

    The script in your linked article looks promising - would it be possible to modify it to select multiple named layers rather than just one?

    Will this script run in a reasonable time with a very large layout (multiple GB if fully flattened) or might a different approach be faster?

Reply
  • shlomo34
    in reply to Andrew Beckett

    Hi, I am currently having the same issue. From your answer it sounds like the methodology was a work in progress 6 years ago - what is the best method right now?

    The script in your linked article looks promising - would it be possible to modify it to select multiple named layers rather than just one?

    Will this script run in a reasonable time with a very large layout (multiple GB if fully flattened) or might a different approach be faster?

Children
  • Andrew Beckett
    in reply to shlomo34

    The performance is likely to depend mostly on the number of objects there are to be "flattened" and the complexity of the hierarchy in the hierarchy traversal. It's hard to generalise. There's not particularly any benefit in updating the code to select multiple layers - you might just as well call it in a loop, iterating over the layers.

    Another approach would be to use the abe functions as I mentioned before. Something as simple as:

    abeInit(srcCv)
    M1=abeLayerFromCellView("Metal1")
    abeLayerToCellView(M1 "Metal1" ?cvId dstCv)
    abeDone()

    would copy the shapes on one layer (throughout the hierarchy) from a srcCv to a dstCv id. Note that the "abe" functions are limited to octalinear shapes (multiples of 45 degree angles), but providing that's OK, they're very likely to be the fastest approach. The code is also very simple...

    Andrew

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