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Overlapping Pin layers not triggering abutment.

snee

I have created a PCell of a traditional transistor. Both the Source and Drain is their own ROD object. I have setup the abutment properties according to documentation, however when overlapping one cells source with the others drain the auto abutment function (MosAbutFunc) is never called and the shapes never snap.

The following is how I attach abutment options to the respective Diff layers.

leftObj = leftDrain->dbId
net_id = dbMakeNet( pcCellView "S" )
term_id = dbCreateTerm( net_id "S" "inputOutput" )
pin_id = dbCreatePin( net_id leftObj "leftDiff")
dbReplaceProp(leftObj "abutFunction" "string" "MosAbutFunc")
dbReplaceProp(leftObj "abutAccessDir" "list" list("left"))
dbReplaceProp(leftObj "abutClass" "string" "diffs")
dbReplaceProp(leftObj "vxlInstSpacingDir" "list" list("left") )
dbReplaceProp(leftObj "vxlInstSpacingRule" "float" 2.0)

rightObj = rightDrain->dbId
net_id = dbMakeNet( pcCellView "D" )
term_id = dbCreateTerm( net_id "D" "inputOutput" )
pin_id = dbCreatePin( net_id rightObj "rightDiff")
dbReplaceProp(rightObj "abutFunction" "string" "MosAbutFunc")
dbReplaceProp(rightObj "abutAccessDir" "list" list("right"))
dbReplaceProp(rightObj "abutClass" "string" "diffs")
dbReplaceProp(rightObj "vxlInstSpacingDir" "list" list("right") )
dbReplaceProp(rightObj "vxlInstSpacingRule" "float" 2.0)

Parents
  • The issue is, I can abut ME1 Drawing layers, but I cannot abut any other layer.

    For example, if I create a MOS device, whos Source/Drain are rod-objects of layer "Diff drawing", abutment will not work. However, if I change the layer in my PCell to "ME1 drawing", for experimentation, abutment works correctly.

    The issue is the Diff layer. What would cause one layer to be abutable, but others not to work?

    Again, this is the same PCell code, just the layers for S/D are redefined.
Reply
  • The issue is, I can abut ME1 Drawing layers, but I cannot abut any other layer.

    For example, if I create a MOS device, whos Source/Drain are rod-objects of layer "Diff drawing", abutment will not work. However, if I change the layer in my PCell to "ME1 drawing", for experimentation, abutment works correctly.

    The issue is the Diff layer. What would cause one layer to be abutable, but others not to work?

    Again, this is the same PCell code, just the layers for S/D are redefined.
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