Accessing certain layer and get its ll and ur coordinates

I read old threads about this topic specially how to access a layer without flattening and i found:

lpId = car(setof(lp geGetEditCellView()~>lpps lp~>layerName == "metal1" && lp~>purpose == "drawing"))
lpId~>shapes~>bBox

But after getting the layer ID and search for its bBox it gives me nil.

So please i need your help for a skill script perform the tasks in the first thread without flattening which are:
1) Grouping the instances.

2) Accessing the needed layer.

3) Get its ll and ur coordinates.

4)Create rect with this layer and list of gotten points.

5)ungroup them again.

Thanks in advance

Hi Inas Mohammad,

I believe geGetEditCellView()~>lpp will return shapes's lpp which are used in that cell view alone and not hierarchically. That's why you may be getting nil return. To get hierarchical shape information you can use leSearchHierarchy or dbGetOverlaps

Instead you may try the following

1. Try using already available Layer generation script.

2. Or you can write using rteGeom* functions.

Thanks

Ramakrishnan

Actually the ~>lpp attribute on a cellView will list all the layer purpose pairs used in the hierarchy (provided the lower level cellViews are loaded in memory). However, the ~>lpp~>shapes will only give the shapes in the current cellView, as Ramakrishnan said. So you may find some lpp objects have no shapes, because the layer purpose is used in a lower level cellView, but there's nothing in the top level.

Regards,

Andrew.

Thanks for the correction.

ok i tried the leSearchHierarchy for a single transistor and it gives me 2 bBox values for the 2 PP layers used.

But when i applied this to a pattern of transistor it gives me many bBox values but all are for the 1st transistor in the lower left corner.

what i want is to get the most ll and most ur PP bBox for the whole boundary to be able to draw a PP rectangle to solve the in between spacing DRC error.

Can you help me achieving this goal in a pattern shown blow know that i need the size of the PP rectangle changes with changing the pattern size?

So i need a script the gets the bBox of the PP layer then draw a rectangle of this information a pattern

Hope you get my point.

Thanks

Your requirements are a bit imprecise, so I'll provide some code which illustrates the principle. If you have a list of instances and a named layer purpose pair, you can use this code:

/******************************************************************
*                                                                 *
*             CCFfindLayerExtentFromInsts(insts lpp)              *
*                                                                 *
* Find the overall bounding box of a specified layer-purpose-pair *
*                   across a list of instances.                   *
*                                                                 *
******************************************************************/
procedure(CCFfindLayerExtentFromInsts(insts lpp)
    let((minLLX minLLY maxURX maxURY)
        foreach(inst insts
            ;------------------------------------------------------------
            ; Find the matching layer purpose and get the shapes on that
            ; layer purpose
            ;------------------------------------------------------------
            shapes=car(exists(LP inst~>master~>lpps 
                LP~>layerName==car(lpp) && LP~>purpose==cadr(lpp)))~>shapes
            ;------------------------------------------------------------
            ; For each shape, transform the bounding box up to the parent
            ; cellView's coordinate system, and pull apart the coordinates,
            ; comparing them against the min/max found so far
            ;------------------------------------------------------------
            foreach(shape shapes
                destructuringBind(((llx lly) (urx ury)) 
                    dbTransformBBox(shape~>bBox inst~>transform)
                    minLLX=if(minLLX min(minLLX llx) llx)
                    minLLY=if(minLLY min(minLLY lly) lly)
                    maxURX=if(maxURX max(maxURX urx) urx)
                    maxURY=if(maxURY max(maxURY ury) ury)
                )
            )
        )
        when(minLLX
            list(minLLX:minLLY maxURX:maxURY)
        )
    )
)

You'd just (say) select the instances (to experiment with) and then do:

CCFfindLayerExtentFromInsts(geGetSelSet() list("PP" "drawing"))

This will return the overall bBox of that layer purpose pair in the list of selected instances. You could use this return value to pass to dbCreateRect to create the rectangle in the same region.

Regards,

Andrew.

Thanks for your reply.

I did something like the following part in the whole code for accessing a layer at the corner transistors of the patter & i highlighted the parts i added in red and the whole new procedure i added in yellow. But when i run the code it gives me and invalid point at the dbTransformPoint command line. Would you please tell me why i'm getting this error? when i tried the steps individually in the CIW it worked.

procedure(place_devices(cellView devLib devCell Length nfunit wfunit DUM1nf DUM1wf DUM2nf DUM2wf yPitch pattern)
let((params array nRows nCols Type dev name nf wf inst devCounts x y xPitch (x0 0.0) (y0 0.0) llInst urInst)

devCounts=makeTable('DEVCOUNT 0)
array = listToVector(foreach(mapcar row reverse(pattern) listToVector(parseString(row " "))))
nRows=length(pattern)
y=y0
for(row 0 nRows-1
x=x0
nCols=length(array[row])
for(col 0 nCols-1
dev=array[row][col]
;println(dev)
devCounts[dev]++
name=sprintf(nil "%s.%d" dev devCounts[dev])
Type=cond(
(eq('M getchar(array[row][col] 1)) 'device)
(zerop(row) && (zerop(col) || (col == nCols-1)) 'corner)
(zerop(col) && (zerop(row) || (row == nRows-1)) 'corner)
(zerop(row) || (row == nRows-1) 'topBottom)
(zerop(col) || (col == nCols-1) 'leftRight)
(t 'dummy)
)
caseq(Type
((device dummy)
nf=nfunit
wf=wfunit
)

(corner
nf=DUM1nf
wf=DUM2wf
)

(topBottom
nf=DUM2nf
wf=DUM2wf
)

(leftRight
nf=DUM1nf
wf=DUM1wf
)

(t error("type=%l\n" Type)
)
)

when(row==0 && col==0
llInst=inst
)
when(row==nRows-1 && col==nCols-1
urInst=inst
)

params = list(
list("l" "string" aelSuffixNotation(1u * Length))
list("w" "string" aelSuffixNotation(1u * wf))
list("fingers" "string" sprintf(nil "%d" nf))
list("polyContacts" "string" "True")
if(oddp(row)
then
list("routePolydir" "string" "Bottom")
else
list("routePolydir" "string" "Top")
)
) ; params

when(zerop(col)
; Device is on left edge. Add detached bodytie.
params = xcons(params
list("bodytie_type" "string" "Detached"))
)

when(col == nCols-1
; Device is on right edge. Add detached bodytie.
params = xcons(params
list("bodytie_typeR" "string" "Detached"))
)

inst=dbCreateParamInstByMasterName(cellView devLib devCell "layout" name x:y "R0" 1 params)
xPitch = (nf * Length) + (nf * 0.2)

;; TODO: Replace numbers with space/extension params
;; Or, use rodGetObj and/or M1 geometry of the
;; inst->master cellView to calculate the xPitch
;; of the instantiated device

;; Calculate x coordinate for next device
x = x + xPitch

)
y = y + yPitch
)

add_layer(geGetEditCellView() llInst urInst "NW" "drawing")
add_layer(geGetEditCellView() llInst urInst "PP" "drawing")
dbSave(geGetEditCellView())
geAskOverwriteMode(geGetEditCellView())
)) ; let ; procedure

procedure(add_layer(cellView llInst urInst Name purp)
let((lpp ll ur)
lpp = car(exists(x llInst->master->lpps (x->layerName == layerName && x->purpose == purpose)))
ll = car(car(lpp->shapes)->bBox)
ll = dbTransformPoint(ll llInst->transform)
lpp = car(exists(x urInst->master->lpps (x->layerName == layerName && x->purpose == purpose)))
ur = cadr(car(lpp->shapes)->bBox)
ur = dbTransformPoint(ur urInst->transform)
dbCreateRect(cellView list(layerName purpose) list(ll ur))
)) ; let ; procedure

I suggest you try:

trace(add_layer dbTransformPoint)

to see what arguments are being passed to add_layer and then dbTransformPoint before it fails. Or use the debugger in the IDE... you can look at the variables at the point it errors, or you could put breakpoints beforehand to see what's going on. Maybe llInst and/or urInst are nil?

Trying to guess what's wrong from badly formatted code with no test data is not particularly efficient.

Regards,

Andrew.

Thanks