Stats

  • Locked Locked
  • Replies 3
  • Subscribers 126
  • Views 3767
  • Members are here 0
This discussion has been locked.
You can no longer post new replies to this discussion. If you have a question you can start a new discussion

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 

  • maskdesigner

    Hi Veera,

    The CAD layer number is the number prescribed by the given process/foundary that must be used in the gds database. The stream number is the number sequence assigned to that layer for the stream out process. One the foundry receives the gds file it then has to transfer those cad layer numbers to the MASK numbers used for data prep that defines the field for clear/dark. Hope that helps !!

  • Andrew Beckett
    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
  • maskdesigner
    Much clearer !! Thanks Andrew.


    David M Parmeter
    IC Layout Engineer
    Skyworks Solutions

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.