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Difference between layer number & stream number in technology file

VEERA PRAMOD

 I would like to know the difference between layer number & stream number in technology file.

 

Thank you.

Veera Pramodu Kotrika 

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  • I don't think that was quite the question, so the answer is not quite right.

    The Cadence database actually stores data on layers using a numerical layer number and purpose number. The tech file associates names with these numbered layers/purposes, but really it's stored as a number.

    The numbers chosen are to some extent arbitrary, although sometimes people try to align them with the numbers used in the stream (aka GDS) files.

    The streamLayers information in the tech file (if present) controls the mapping of these Cadence layer numbers to stream layer numbers. In the absence of streamLayers in the tech file or a layer mapping file, the stream file gets written using the Cadence layer numbers.

    Hope that's clearer?

    Regards,

    Andrew
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  • I don't think that was quite the question, so the answer is not quite right.

    The Cadence database actually stores data on layers using a numerical layer number and purpose number. The tech file associates names with these numbered layers/purposes, but really it's stored as a number.

    The numbers chosen are to some extent arbitrary, although sometimes people try to align them with the numbers used in the stream (aka GDS) files.

    The streamLayers information in the tech file (if present) controls the mapping of these Cadence layer numbers to stream layer numbers. In the absence of streamLayers in the tech file or a layer mapping file, the stream file gets written using the Cadence layer numbers.

    Hope that's clearer?

    Regards,

    Andrew
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