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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

    You can't. Why do you want this? If it's to archive the design somehow, the right thing to do is to save the source database as well as the stream file - and then if you need to do re-work, use the design database. There is too much loss of data when exporting to stream (you lose the connectivity, lose pcells, and various other constructs) - so working from the orignal design database makes far more sense. Most of the time you're going to need that anyway for your schematics and simulation setup, so why not keep the layout database as the master?

    Maybe you have a good reason for wanting the "round trip" to work - if so, please elaborate.

    Regards

    Andrew.

Reply
  • Andrew Beckett

    You can't. Why do you want this? If it's to archive the design somehow, the right thing to do is to save the source database as well as the stream file - and then if you need to do re-work, use the design database. There is too much loss of data when exporting to stream (you lose the connectivity, lose pcells, and various other constructs) - so working from the orignal design database makes far more sense. Most of the time you're going to need that anyway for your schematics and simulation setup, so why not keep the layout database as the master?

    Maybe you have a good reason for wanting the "round trip" to work - if so, please elaborate.

    Regards

    Andrew.

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