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Streaming out pcells to gds

mtwadeCU

Hi,

While I'm actively developing a pcell, it is useful to be able to stream out a gds directly from the pcell without instantiating it in another layout first. However, when I try to stream out the pcell using the CIW File -> Export -> Stream, the streamed out file is empty and the "Summary of Objects Translated" message to the CIW shows that zero shapes were translated. If I first create a new layout cellview and instantiate the pcell in that layout, I can stream things out just fine. Is there a way to stream out a pcell without first instantiating it in a larger layout? 

Thanks,

Mark 

Parents
  • Andrew Beckett

    Mark,

    I've tried streaming out from VM works in all IC616 subversions (base release, plus ISR1 to ISR7). However, I found that adding a dbSave() wasn't enough to make it work without save from VM. I also had to do a "make readonly" (in essence):

     cv=pcDefinePCell(
        list(ddGetObj("example") "example" "layout")
        (
            (w 1.0)
            (l 1.0)
            (repeatX 10)
            (repeatY 5)
            (spacing 0.5)
            (layer "Metal1")
        )
        let((x y)
            for(i 1 repeatX
                for(j 1 repeatY
                    x=(i-1)*(w+spacing)
                    y=(j-1)*(l+spacing)
                    dbCreateRect(pcCellView layer list(x:y x+w:y+l))
                )
            )
        )
    )
    dbSave(cv)
    ; need this for some reason to allow stream out from disk!
    dbReopen(cv "r")

    In IC615 this last line wasn't necessary.

    Also in IC616 (all versions that I tried), it seemed to be outputting 100 rectangles rather than 50. As far as I can see, it has two copies of each rectangle in the stream file.

    Something odd going on here...

    If you can send me a private message to say what organisation you work for, I can log this as a CCR on your behalf. At the very least you've got a workaround of being able to do the dbReopen.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Mark,

    I've tried streaming out from VM works in all IC616 subversions (base release, plus ISR1 to ISR7). However, I found that adding a dbSave() wasn't enough to make it work without save from VM. I also had to do a "make readonly" (in essence):

     cv=pcDefinePCell(
        list(ddGetObj("example") "example" "layout")
        (
            (w 1.0)
            (l 1.0)
            (repeatX 10)
            (repeatY 5)
            (spacing 0.5)
            (layer "Metal1")
        )
        let((x y)
            for(i 1 repeatX
                for(j 1 repeatY
                    x=(i-1)*(w+spacing)
                    y=(j-1)*(l+spacing)
                    dbCreateRect(pcCellView layer list(x:y x+w:y+l))
                )
            )
        )
    )
    dbSave(cv)
    ; need this for some reason to allow stream out from disk!
    dbReopen(cv "r")

    In IC615 this last line wasn't necessary.

    Also in IC616 (all versions that I tried), it seemed to be outputting 100 rectangles rather than 50. As far as I can see, it has two copies of each rectangle in the stream file.

    Something odd going on here...

    If you can send me a private message to say what organisation you work for, I can log this as a CCR on your behalf. At the very least you've got a workaround of being able to do the dbReopen.

    Regards,

    Andrew.

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