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Change manufacturing grid for streamout in IC613

tkhan

How can the manufacturing grid size be changed when streaming out in IC613? In IC5141 there was an option to set the grid size in DBUperUU but I can't find this option in IC613 and the fab is saying the design has been streamed out at the wrong grid size. Please advise.

Parents

  • It shouldn't really matter what DBUperUU you have in a GDS file, as long is it has sufficient resolution. 

    There is a record in stream format called "UNITS" which has two numbers:

    1. The number of user units in a database unit
    2. The size of a database unit in meters

    Strictly speaking the user unit doesn't really matter that much either, since the numbers in the stream file are integers in database units, and database units are a well defined absolute size (based on the second number in the UNITS record).

    So anything reading the stream file should be able to convert the database units in the stream file into whatever database units that application is using. The cases which I've heard of which have had problems have been to do with Mentor's Calibre, but I don't actually know whether the problem was with Calibre itself (which I'd be surprised) or whether it was just the appropriate option in the rule deck for Calibre was not used.

    So I would strongly ask the foundry why they need to database unit in the stream file to be a specific size - it really shouldn't matter.

    Regards,

    Andrew.

Reply

  • It shouldn't really matter what DBUperUU you have in a GDS file, as long is it has sufficient resolution. 

    There is a record in stream format called "UNITS" which has two numbers:

    1. The number of user units in a database unit
    2. The size of a database unit in meters

    Strictly speaking the user unit doesn't really matter that much either, since the numbers in the stream file are integers in database units, and database units are a well defined absolute size (based on the second number in the UNITS record).

    So anything reading the stream file should be able to convert the database units in the stream file into whatever database units that application is using. The cases which I've heard of which have had problems have been to do with Mentor's Calibre, but I don't actually know whether the problem was with Calibre itself (which I'd be surprised) or whether it was just the appropriate option in the rule deck for Calibre was not used.

    So I would strongly ask the foundry why they need to database unit in the stream file to be a specific size - it really shouldn't matter.

    Regards,

    Andrew.

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