How to get all the really used layer in the cellview .

I have seen this before. What is probably happening is that you have a layer used in your pcells when all parameters are defaults, but that layer is not used when your pcell instance parameters are changed.

For example, let's say you have a pcell called "nmos". If you place a default "nmos", maybe it has an implant layer. However, in the cellview you are describing you have placements of "nmos", but all of them have the implant layer turned off. The lpps attribute of the top cellview will show you the layers in all of the cells in the hierarchy, but for pcells, it is looking at their default representation in the library. Open each of your pcells directly from the pcell library and you should see the layer you are describing in one of those pcell masters.

The only way around this is to traverse the hierarchy of your cellview, visiting every master once (including pcell submasters) and look at the lpps with nShapes as Andrew mentioned earlier.

procedure( myGetLppsUsed(cv)
  let((masterTbl lppTable )
    masterTbl = makeTable("masterTbl" nil)
    lppTable = makeTable("table" nil)
    myGetLppsUsedHierTraversal(cv masterTbl lppTable)
    lppTable->?
  )
)

procedure(myGetLppsUsedHierTraversal(@optional (cv geGetTopLevelCellView()) masterTbl lppTable)
    foreach(masterList list(cv~>instanceMasters cv~>viaHeaders)
        foreach(master masterList
            unless(masterTbl[master]
                unless(master~>isParamCell
                    masterTbl[master]=t
                    mapcar(
                        lambda((x)
                            lppTable[list(x~>layerName x~>purpose)] = t
                        )
                        setof(x master~>lpps x~>nShapes > 0)
                    )
                    myGetLppsUsedHierTraversal(master masterTbl lppTable)
                )
            )
        )
    )
    t
) ;proc

Derek

I have seen this before. What is probably happening is that you have a layer used in your pcells when all parameters are defaults, but that layer is not used when your pcell instance parameters are changed.

For example, let's say you have a pcell called "nmos". If you place a default "nmos", maybe it has an implant layer. However, in the cellview you are describing you have placements of "nmos", but all of them have the implant layer turned off. The lpps attribute of the top cellview will show you the layers in all of the cells in the hierarchy, but for pcells, it is looking at their default representation in the library. Open each of your pcells directly from the pcell library and you should see the layer you are describing in one of those pcell masters.

The only way around this is to traverse the hierarchy of your cellview, visiting every master once (including pcell submasters) and look at the lpps with nShapes as Andrew mentioned earlier.

procedure( myGetLppsUsed(cv)
  let((masterTbl lppTable )
    masterTbl = makeTable("masterTbl" nil)
    lppTable = makeTable("table" nil)
    myGetLppsUsedHierTraversal(cv masterTbl lppTable)
    lppTable->?
  )
)

procedure(myGetLppsUsedHierTraversal(@optional (cv geGetTopLevelCellView()) masterTbl lppTable)
    foreach(masterList list(cv~>instanceMasters cv~>viaHeaders)
        foreach(master masterList
            unless(masterTbl[master]
                unless(master~>isParamCell
                    masterTbl[master]=t
                    mapcar(
                        lambda((x)
                            lppTable[list(x~>layerName x~>purpose)] = t
                        )
                        setof(x master~>lpps x~>nShapes > 0)
                    )
                    myGetLppsUsedHierTraversal(master masterTbl lppTable)
                )
            )
        )
    )
    t
) ;proc

Derek