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How to get Pcell instance pins connection information?

GGLin

I create a cellview with a Pcell instnace.

And I want to attach the label according to the DGSB for LVS.

I can use the inst->master->terminals->pins to get the DGSB pins correspond coordinate in the cellview. 

Like:

instParentTerminals = inst->master->terminals
foreach(term instParentTerminals
    foreach(pin term->pins

    foreach(pin term->pins
        printf("%L\n" pin->fig->lpp )
    )
        pointList = tconc(pointList dbTransformPoint(centerBox(pin->fig->bBox) inst->transform ) )
    )
    terminalList = tconc(terminalList list( term->name car(pointList) ) )
    pointList = nil

)

But I need to know which metal in the Pcell is connected to these pins due to the figs of these pins are not assigned to the metal directly. ex: S and D are assigned to OD 

Is there any way to get this kind of information?

Or is there any way I can do net tracing in db level rather than open a window and call leMarkNet? It is not a efficient way to do such a thing. 

Parents
  • GGLin

    Thanks for the replay.

    Yes I can see the /S/ /D/ /G/ on the pcell metal.

    But when I use the code above, only the G can get the metal pin, while S & D can get only the OD pins.

    and the nested code is just a paste error, I just want to see the layer name and purpose only.

  • Andrew Beckett
    in reply to GGLin

    OK, I've realised what you're probably doing wrong. Rather than looking at pin~>fig, you should look at pin~>figs. It's likely that the pin has multiple figures, which is how strongly connected pins are represented in the database. The ~>fig is a compatibility mode for old CDB code because prior to OpenAccess, you could only have a single figure on each pin and strong connects were represented a different way.

    So try iterating over the figs on the pin and see whether there's a figure on the layer you want.

    Regards,

    Andrew.

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