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Assura LVS - number of edges of first layer butting/coincident with the second layer

windowsdee

Hi,

I am using Cadence version 5.10.41.500.6.145 and assura verison 04.12.006

For LVS extraction, I have to count the number of edges of first layer butting/coincident with the second layer.

I tried using measureParameter( figCount(....)), but this gives the following error and LVS fails.

Illegal Operator (figCount ...) found in measureParameter(); the valid operator is one of area, perimeter, length, regionID, bends_all, bends_full or bends_part.

IS figCount not valid in the version I am using?

Please let me know how I could do this.

Thank you,

  • Hi windowsdee

    Thank you for the clear problem description. You have described your issue very well. figCount only works with "enclosing" function to count the number of shapes that are enclosed by another layer (e.g. number of gate shapes on a diffusion).

    fingers = measureParameter( figCount( diff enclosing gate) )

    Depending on the size of the butting shapes, you might be able to do it as follows:
    a. Use geomButtOrCoin to first identify shapes (layerA) that are butting or coincident to your target shape
    b. Identify a suitable layer (layerB) around the target shape that can enclose the identified layerA shapes
    c. Use figCount to get the number of shapes.

    layerA=geomButtOrCoin(layerX targetShape)
    numShapes=measureParameter( figCount( someSuitableLayer enclosing layerA) )

    The above would of course not work if your butting shapes are very large such that no suitable enclosing shape can be used. There is an old CCR7857 that requested for figCount to also work with other functions like butting, etc but unfortunately it never got implemented.


    Best regards
    Quek

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