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GDS stream version

AnnaP

Hi,

 What specific differences are there between the GDS stream version 6 and 3, or 5?

 For instance,

% od -x proj_1.gds | head -1

0000000 0006 0002 0003 001c 0102 006c 0006 000a %          stream version 0003

versus the

        % od -x tproj_2.gds | head -1

0000000 0006 0002 0006 001c 0102 006c 0005 0005                  stream version 0006

Thanks.           

Parents

  • Hi Anna,

    So does that mean you're using a Calma GDS? People often use the term "GDS" to refer to the format, when the format is actually "stream format".

    Normally the tool that writes out the stream file defines what version it uses, but in practice it's unlikely to matter what version was used, since the new features in version 4-6 are not used in practice as far as I'm aware. The document I referenced gives the full specification of the stream format.

    In the Cadence IC tools you can choose to write out in versions 3, 5, or 6. Not that I think it makes much difference (the default is 5).

    So I didn't really understand your last  question - or even if it was a question!

    Regards,

    Andrew.

     

Reply

  • Hi Anna,

    So does that mean you're using a Calma GDS? People often use the term "GDS" to refer to the format, when the format is actually "stream format".

    Normally the tool that writes out the stream file defines what version it uses, but in practice it's unlikely to matter what version was used, since the new features in version 4-6 are not used in practice as far as I'm aware. The document I referenced gives the full specification of the stream format.

    In the Cadence IC tools you can choose to write out in versions 3, 5, or 6. Not that I think it makes much difference (the default is 5).

    So I didn't really understand your last  question - or even if it was a question!

    Regards,

    Andrew.

     

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