Checking for overlapping cells

Hi,

I am creating a layout in which I am placing over 1000 instances of
different test circuits. There is no boundary created for each
subcell.
Is there any convenient method that I can check that there are no
overlap of the bbox for the 1000 instances?

I would love to have a marker created over the overlapping cells.

Thanks!

 

Hi,

How about creating a boundary for each cell (any layer which you can
remove later), then using xor to check for overlaps?


Best regards,
I-F AB

 

Sorry, didn't make myself clear enough.
Use a layer (not utilised) on the bounding box & create a thin path.
Then check with dbLayerXor() or leLayerXor() for overlaps.
Try unused layers for an easier check.

I'm more used to using Assura for layer processing.

Best regards,
I-F AB

 

Hi,
If you have Assura, this might help:
Use SKILL code below to create the bounding box.
--------------------------------------------------------
cv = geGetEditCellView()
CELLS = cv~>instances
BOXES = cv~>instances~>bBox
foreach(Box BOXES
rodCreateRect(
?cvId cv
?layer '("border" "drawing")
?bBox Box
)
)
--------------------------------------------------------

Next, create an assura rule file as below & run in DRC:
-------------------------------------------------------------------------
drcExtractRules(
layerDefs( "df2"
BORDER = layer( "border" type( "drawing" ) )
);end of layerDefs

OVERLAPS = geomAnd(BORDER)
errorLayer(OVERLAPS "INFO: Overlapping here." )
) ;drcExtractRules

 

For full SKILL codes (I'm not sure if it is more efficient), Cadence
Solution Number 11097614 has this code:

procedure(CCSfindOverLapInstance()
let((cv objList)
cv=geGetWindowCellView()
foreach(inst cv~>instances
objList=dbGetOverlaps(cv inst~>bBox nil)
foreach(obj objList
if(obj~>name != inst~>name
printf("Instance %s overlaps Instance %s\n"
obj~>name inst~>name)
); end if
);end foreach
);end foreach
);end let
);end procedure

I would've gone through Sourcelink sooner but the line is loading
quite slow.

Best regards,
I-F AB