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How to flatten layout cells and preserve pin names when pin names from different cells are the same

twen

I am using virtuoso version 6.1.6-64b 12/07/2015 20:18 (sjfbm186) .

Suppose I have a top level cell T, and T contains two cells A and B, and there are a pin called P in both A and B. When I flatten cells A and B by gui (Preserve pins, preserve ROD Objects) to by foreach(s list(dbA dbB) dbFlattenInst(s 1 t t t t t t t)), the pin P in cell A is brought up into cell T without any problem. However, the label on pin P in cell B is renamed to something like dbNet032. I see this can be useful in certain cases, but it is not what I want.

Is there anyway that I can flatten A and B and brought up the pin P to cell T and keep both pins' label as it was?

Thanks in advance,

TJ

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  • Andrew Beckett

    The problem is that you passed "" as the fifth argument to abFlattenInst. That will break the code completely, because it means that it tries to rename each net to the same name it is already - the whole point is that it temporarily renames the nets with a suffix (default called "_abFlatTmp") to avoid a clash, flattens, and then merges them back afterwards. The temporary name no longer exists at the end - so you should not have to specify this at all except in the unlikely event that you already have nets/terms with the suffix "_abFlatTmp".

    The comments at the top of the code also suggest you can ignore the suffix comment.

    By specifying the suffix as "", nothing gets renamed, and hence you end up with the clash still every time it tries to flatten.

    I ran:

    foreach(sel geGetSelSet() abFlattenInst(sel 1 t t))

    and that worked fine.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    The problem is that you passed "" as the fifth argument to abFlattenInst. That will break the code completely, because it means that it tries to rename each net to the same name it is already - the whole point is that it temporarily renames the nets with a suffix (default called "_abFlatTmp") to avoid a clash, flattens, and then merges them back afterwards. The temporary name no longer exists at the end - so you should not have to specify this at all except in the unlikely event that you already have nets/terms with the suffix "_abFlatTmp".

    The comments at the top of the code also suggest you can ignore the suffix comment.

    By specifying the suffix as "", nothing gets renamed, and hence you end up with the clash still every time it tries to flatten.

    I ran:

    foreach(sel geGetSelSet() abFlattenInst(sel 1 t t))

    and that worked fine.

    Regards,

    Andrew.

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