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lxGenFromSource - BUT ignore existing layout views and give me "flat" devices

vtboy51

I am using the lxGenFromSource in my SKILL routine to generate a layout view of my top level cellview (which has multiple sub-cells instantiated). As we all know if a layout view is found for any of the schematic sub-cells it will place that layout view and not generate "flat" devices. However, for my needs I would like to specify a temp library to generate the top level layout in, and NOT pull-in the existing layouts. 

My workaround has been to copy the schem/symbols into a temp lib and then run, but the copy is slow for larger designs.

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  • RobMan

    The schematic/layout binding initialisation is defined in the physConfig cellview. Follow these steps...

    Edit the physConfig, You will need to add at least one 'Physical stop Library'. Typically the pdk device lib (XL needs to know where to stop descending the hierarchy).

    Then select all the instnaces: RMB -> Set hierarchical force descend. Save CPH.

    Layout -> Generate From Source: Should result in all hierarchy expanded down to primitive devices.

  • RobMan
    in reply to RobMan

    Also consider the Design Planning and Analysis flow...

    Virtuoso Design Planning and Analysis (IC25.1)

    Offers a more flexible approach to design planning.

  • Andrew Beckett
    in reply to RobMan

    In addition to Rob's suggestions, if this is all being done from SKILL, there are "cph" functions for setting force descend too...

    Andrew

  • vtboy51
    in reply to Andrew Beckett

    Yes, this is all being done inside my code so I'll look up the cph fuctions. Thanks

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  • vtboy51
    in reply to Andrew Beckett

    Yes, this is all being done inside my code so I'll look up the cph fuctions. Thanks

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