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Hi Ronny,

The MOSIS rule refers to the actual CIF/GDS "contact cut"---i.e., the
size of the hole in the oxide between the layers.

The Magic rule, on the other hand, refers to Magic's "contact macros"
which include the necessary layer overhang on all sides, generally 1
lambda.  1 lambda to the left, 2 lambda hole, 1 lambda to the right---that's
4 lambda total.

Say you have a metal2 contact (m2c, via) that is 4x4 in Magic.
You can see the different CIF layers that are generated as follows:

look at metal 1 ("Metal First")

:cif see CMF

clear it

:feedback clear

the contact cut itself .. it would be "CCA" for pdc

:cif see CVA

:feedback clear

metal 2 ("Metal Second")

:cif see CMS

and so on...

   Best regards,
     Mika Nystrom
     California Institute of Technology

Ronny Bockstaele writes:
>Dear,
>
>
>A beginners question: I'm browsing through the technology file 
>SCN4M_SUBM.20.TSMC.tech27, downloaded from 
>ftp://ftp.isi.edu/pub/sondeen/magic/tanner_pads_ported_to_magic/scn035-pads/mT
>SMs035Pf_release-2000-03-07/
>
>somewhere in the section on design rules, there is:
>...
>width pdc/m1 4 \
>"diffusion contact width < 4 (Mosis #6.1)"
>...
>
>I don't understand it: the mosis rule 6.1 says exact contact size is 2x2 
>lambda.
>
>Any help is welcome.
>
>
>Kind regards,
>
>Ronny

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