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Pcell Vs Pycell

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Hi Everybody,

We have two technology files for tsmcN28 which are named as techfile_pcell and techfile_pycell.  Can anybody tell me the what is the difference between pcells and pycells.  Which technology file (pcell or pycell) have to select.

 In earlier technologies I used pcells (tsmcN40) for my layout in IC51 version. Now we are migrated to IC61 version for 28nm technology.

Thanks in Advance.

Srinivas.

Parents

  • Srinivas,

    Whether you use pycells or SKILL pcells, most foundry PDKs would aim to have the same layout regardless of which was used.

    However, using non-SKILL pcells means that:

    1. If there is a problem with the tools, we cannot provide support since we can't test and debug the issue (we don't have the source code). So there is greater risk if you are using non-SKILL pcells, because we may not be able to solve a problem because of inability to debug/test with your data.
    2. Some functionality is not available when using non-SKILL pcells (e.g. modgens, placement, PVS running inside Virtuoso).

    Regards,

    Andrew.

Reply

  • Srinivas,

    Whether you use pycells or SKILL pcells, most foundry PDKs would aim to have the same layout regardless of which was used.

    However, using non-SKILL pcells means that:

    1. If there is a problem with the tools, we cannot provide support since we can't test and debug the issue (we don't have the source code). So there is greater risk if you are using non-SKILL pcells, because we may not be able to solve a problem because of inability to debug/test with your data.
    2. Some functionality is not available when using non-SKILL pcells (e.g. modgens, placement, PVS running inside Virtuoso).

    Regards,

    Andrew.

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