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Extract the number of the top most metal layer of a cell using SKILL

maheshwaran

Hello,

I am fairly new to custom design and SKILL. I have a requirement to extract the number of the top most metal stack for processing for e.g. if a cell a total metal stacks uptill M14 I need to know that the cell's highest metal stack is M14 along with the cell name, If a cell has upto M12 my output should be M12 with the cell name. Is there way in SKILL to do that? if yes, Could anyone help me? 

Thanks,

Mahesh

  • Just threw this together:

    /* abGetHighestLayer.il

Author     A.D.Beckett
Group      Custom IC (UK), Cadence Design Systems Ltd.
Language   SKILL
Date       Jun 17, 2019 
Modified   
By         

Find the highest layer of a certain type (defaults to metal) in
the design.

abGetHighestLayer() => "Metal4"

abGetHighestLayer(?acrossHierarchy t) => "Metal6"

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

SCCS Info: @(#) abGetHighestLayer.il 06/17/19.21:05:07 1.1

*/

/*********************************************************************
*                                                                    *
* abGetHighestLayer(@key (cv geGetEditCellView()) (function "metal") *
*                          acrossHierarchy)                          *
*                                                                    *
* Find the topmost layer with the given function (defaults to metal) *
* in the given cellView (defaults to current), optionally looking at *
*                  all in the hierarchy if needed.                   *
*                                                                    *
*********************************************************************/

procedure(abGetHighestLayer(@key (cv geGetEditCellView()) (function "metal") 
        acrossHierarchy)
    let((tf topToBottom usedLayers)
        ;----------------------------------------------------------------
        ; Figure out the order of the layers matching the given function
        ; and put it in reverse order
        ;----------------------------------------------------------------
	tf=techGetTechFile(cv)
        topToBottom=reverse(
            mapcar('car 
                setof(layerFunc techGetLayerFunctions(tf) cadr(layerFunc)==function)
            )
        )
        ;----------------------------------------------------------------
        ; Now collect all the layers used in the design. If ?acrossHierarchy t
        ; was provided, then include those in lower level cellViews (if opened)
        ;----------------------------------------------------------------
        usedLayers=makeTable('usedLayers nil)
        foreach(lpp cv~>lpps
            when(acrossHierarchy || !zerop(lpp~>nShapes)
                usedLayers[lpp~>layerName]=t
            )
        )
        ;----------------------------------------------------------------
        ; Find the first top to bottom layer that's in the design
        ;----------------------------------------------------------------
        car(exists(layer topToBottom usedLayers[layer]))
    )
)

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