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VLSI layout layer description

Discussion in 'CAD' started by frank, Nov 18, 2003.

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  1. frank

    frank Guest

    hello,

    I as wondering if anyone could direct to me to any good links
    describing the different layers that are used to perform vlsi design.
    I am familiar with most of them, but I could not find anywhere what
    the NFIELD layer is. It is not NWELL, but it mirrors it in all the
    places where there is NWELL. I suspect it is suppose to indicate that
    the location of lightly doped n. Can anyone confirm this? How is it
    different with NWELL?

    P.S The technology is: for xfab 0.35um XC035LV cmos. See document :
    http://www.xfab.com/xfab/frontend/img_db/dl_mg_1064582343.pdf

    page. 3

    Thx.
    -Frank
     
  2. wally

    wally Guest

    problem is Frank that different foundries will give the same layers
    different names.

    eg, i have seen gate conductor called various different names : poly1,
    GC, gateC, etc..

    also, lots of layers exist which you do not actually physically draw, ie
    they are generated automatically from the drawn layers.

    The foundary you are using will have all the docs you need.
     
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