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Hierarchy tree in SKILL from normal schematic, config based schematic and layout

skillprogramme

Hi!

I am working on some code to return the hierarchy below a given cell, irregardless of the cell being a layout or schematic and irregardless of the eventual schematic being normal or config based. In the solution provided by Cadence (linked at end of post), this is done through GUI forms. I would however like to do everything in SKILL, without any open window sessions (other than CIW). 

In the solution it is checked if the schematic has a config view by calling deGetConfigId with window_id as argument. As I would like to do everything from SKILL, I need some other function to do this. Is it any function that can return if a schematic has a related config?

As well, the solution states that normal schematic (and thus layout) trees (no related config, that is) can be printed in non-GUI mode by invoking CCSschTree directly from CIW. It does not say anything about it being possible to call the config based equivalent CCShdbSchTree from CIW. Would it be possible to do this and if not, why?

Cheers,
Max
 

Related Cadence solution:
https://support.cadence.com/apex/homePage 

Parents

  • Hi Max,

    A quick answer to your question "Will consecutive calls to dbOpenCellViewByType with the same arguments leak virtual memory and cause swapping activity over time?" - no, when the same cellview is opened multiple times this is handled efficiently in Virtuoso by increasing a counter for the number of references pointing to the celliew database id.  Each time a reference is closed the counter is reduced by one; when the counter hits 0 the virtual memory is freed. Another efficiency that you may not be aware of is the instHeaders in a cellview virtual memory representation - each instHeader corresponds to a cell that is used in that cellview, whether it is instantiated once or hundreds of times.  Subsequently if you just need to process cells rather than unique instances, you can iterate through the instHeaders (e.g. cv~>instHeaders versus cv~>instances).

    I hope this helps.

    Regards,

    Lawrence.

Reply

  • Hi Max,

    A quick answer to your question "Will consecutive calls to dbOpenCellViewByType with the same arguments leak virtual memory and cause swapping activity over time?" - no, when the same cellview is opened multiple times this is handled efficiently in Virtuoso by increasing a counter for the number of references pointing to the celliew database id.  Each time a reference is closed the counter is reduced by one; when the counter hits 0 the virtual memory is freed. Another efficiency that you may not be aware of is the instHeaders in a cellview virtual memory representation - each instHeader corresponds to a cell that is used in that cellview, whether it is instantiated once or hundreds of times.  Subsequently if you just need to process cells rather than unique instances, you can iterate through the instHeaders (e.g. cv~>instHeaders versus cv~>instances).

    I hope this helps.

    Regards,

    Lawrence.

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