flattening an instance and then removing certain layers

The likely cause of this is that your code is using inconsistent variables:

allShapes = cellview~>shapes

(foreach shape all_shapes

As you can see, the variable names are different... so probably all_shapes contains a different list?

Your code is not the most efficient either - it would be better to iterate through the layer purpose pairs (cellView~>lpps), and then see if that lpp is one to be retained or not, and if not then iterate through all the shapes on that lpp and delete them.

Regards,

Andrew.

Thanks Andrew.

Another query.

Say my cellview has two instances I1 and I2. I want to flatten them and store the dbIds of the resulting shapes in two different variables.

dbIdI1 = All from I1

dbId2 = All from I2

How can I do this because dbflatten returns t/nil?

Thanks,

Shahbaz

There was an enhancement CCR for this in the past, but it was rolled into another CCR which only implemented part of the requested functionality (dbFlattenInst2). I've filed enhancement CCR 1530372 to make up for the earlier one having been only partially fixed.

In the meantime, you can use this code, which has similar semantics to dbFlattenInst2 (which was added in IC6.1.6). The usage would be something like this:

figsA=abFlattenInst2(inset 5 `(nil flattenVias t flattenPCells t))

Regards,

Andrew

/* abFlattenInst2.il

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       Jan 25, 2016 
Modified   
By         

Like dbFlattenInst2 but returns a list of the resulting figures.
Has same call signature as dbFlattenInst2

***************************************************

SCCS Info: @(#) abFlattenInst2.il 01/25/16.11:41:11 1.1

*/

/***************************************************************
*                                                              *
*         abFlattenInst2(instId levels options "dxg")          *
*                                                              *
*    Wrapper around dbFlattenInst2 to return a list of the     *
*                       resulting shapes                       *
*                                                              *
***************************************************************/

procedure(abFlattenInst2(instId levels options "dxg")
    let((cv bBox (before makeTable('before nil)))
        cv=instId~>cellView
        bBox=instId~>bBox
        foreach(fig dbProduceOverlap(cv bBox 0)
            before[fig]=t
        )
        when(dbFlattenInst2(instId levels options)
            setof(fig dbProduceOverlap(cv bBox 0)
                !before[fig]
            )
        )
    )
)