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

Charley,

The ~>lpps attribute gives you a list of all the layer purpose pairs either in this cellView or anything instantiated below (providing the lower levels have been loaded into memory). To get just those in this cellView you could do:

lppsInThisCellView=setof(lpp geGetEditCellView()~>lpps plusp(lpp~>nShapes))

Regards,

Andrew.

Hi Andrew,

If cellview has shapes , it return (db:222231123) ..)  ==>  lppsInThisCellView=setof(lpp geGetEditCellView()~>lpps plusp(lpp~>nShapes))

If cellview only has instances (include pcell ....), it return nil

Cound you help it ?

Thank you,

Charley

Charley,

If the cellView only has instances, no layers are actually used in that cellView, so it should return nil! If you want to see what is used down in the hierarchy, cv~>lpps tells you that already.

Regards,

Andrew.

Hi Andrew,

Yes, cv~>lpps tell me , but when I stream out , all layers in PIPO.LOG not same as cv~>lpps.

;;cv~>lpps  >  PIPO.LOG layers

If lppAll = cv~>lpps

foreach(lpp lppAll

         printf("Layer is %L,%L\n" lpp~>layerName layer~>purpose)  ;;It shows the layer is not really in PIPO.LOG

)

I use leHiSearch() , it also can not find the layer , I want to filter cv~>lpps that not really exists

Thank you,

Charley

I'd have to see an example of where this does not work. I can imagine that stream out might not show it because the layer has been marked to not translate to stream. leHiSearch may not find something that's inside a pcell (I'm guessing).

Andrew.

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

Derek raises a good point - although to clarify you will get the lpps used for both the pcell superMaster (which is effectively the layout corresponding to the default parameters) and all pcell subMasters (i.e. all variants that exist).

This means that if you have layers used in the default, but in none of the actual variants used, then cv~>lpps will list these too. It errs on the side of too many lpps rather than too few.

If you really need to filter out which are truly not used, you'd have to use an approach such as Derek suggests.

Andrew.

Hi Derek,

 It works. It is very helpful.

Thank you very much,

Charley

Hi Andrew,

Thank you for explanation.

Charley