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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

    Hi Praveen,

    I don't see why you need that for LVS. The world has been streaming out and verifying with DRC and LVS from GDSII files for ever - I used to do this over 20 years ago with Dracula and nothing has changed in the meantime to prevent you from doing this - it's a common way to verify with Calibre, Assura, PVS etc - because you want what you verify to be what you send to the fab. Since stream format doesn't have the concept of pcells, each pcell variant is saved as an individual cell - and that shouldn't present a problem for LVS.

    Why do you need to stream back in again after LVS? That's a serious loss of data and seems a rather odd flow.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    Hi Praveen,

    I don't see why you need that for LVS. The world has been streaming out and verifying with DRC and LVS from GDSII files for ever - I used to do this over 20 years ago with Dracula and nothing has changed in the meantime to prevent you from doing this - it's a common way to verify with Calibre, Assura, PVS etc - because you want what you verify to be what you send to the fab. Since stream format doesn't have the concept of pcells, each pcell variant is saved as an individual cell - and that shouldn't present a problem for LVS.

    Why do you need to stream back in again after LVS? That's a serious loss of data and seems a rather odd flow.

    Regards,

    Andrew.

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