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How to keep pcell during stream out

Soldier

Hi：

  while cadence change to IC6.1.1 or above，the option of stream out has not “keep pcell”，what could I do to keep pcell during stream out and stream in.

  Thanks!

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  • Andrew Beckett

    Praveen,

    They are not being renamed - that's almost certainly what the cells are called in the stream file. Stream doesn't support pcells, so when a layout containing pcells is streamed out, each variant is saved as a separate STRUCTURE (i.e a separate cell), and the instances of pcells instantiate the appropriate structure. So all you're seeing when you stream it back in is that all the structures are read in too.

    Since stream is not recording the pcell instance's properties, it can't really do anything other than this. In the past (in IC5141) there was a mechanism to save some additional side file information to allow the round trip from Virtuoso->stream->Virtuoso to restore the pcells, but it was very limited for reasons I've discussed earlier - and this is not supported in IC61X. It only helped anyway if you had created (and kept) the side file info in the first place.

    Regards,

    Andrew.

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  • Andrew Beckett

    Praveen,

    They are not being renamed - that's almost certainly what the cells are called in the stream file. Stream doesn't support pcells, so when a layout containing pcells is streamed out, each variant is saved as a separate STRUCTURE (i.e a separate cell), and the instances of pcells instantiate the appropriate structure. So all you're seeing when you stream it back in is that all the structures are read in too.

    Since stream is not recording the pcell instance's properties, it can't really do anything other than this. In the past (in IC5141) there was a mechanism to save some additional side file information to allow the round trip from Virtuoso->stream->Virtuoso to restore the pcells, but it was very limited for reasons I've discussed earlier - and this is not supported in IC61X. It only helped anyway if you had created (and kept) the side file info in the first place.

    Regards,

    Andrew.

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