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From: cfk (cfk AT pacbell DOT net)
Date: Fri Sep 05 2003 - 17:48:41 EDT

  • Next message: Jeff Sondeen: "Re: standard cell library DRC errors" 

    So, I am working with the bondpads from mosis this afternoon and using them
with magic-7.2.48. The mosis file is mTSMd025Pf_release-2003-03-07 and comes
from Jeff Sondeen's site at
ftp://ftp.isi.edu/pub/sondeen/magic/tanner_pads_ported_to_magic

This file is expanded in a new directory with:

gunzip mTSMd025Pf_release-2003-03-07.tar.gz
tar xvf mTSMd025Pf_release-2003-03-07.tar

Then a cd to mTSMd025Pf_release-2003-03-07
and finally I made all the files writable:

chmod 777 *

Here there are a number of interesting files now. These include bondpad.mag,
PadGnd.mag, PadVdd.mag, PadIO.mag and a very important one called
Lib_Pads.mag. Lets invoke magic with its -w argument and an interesting
technology file. I believe this technology file to be .25 micron (although
things start getting a little fuzzy soon).

magic -w -TSCN5M_DEEP.12.TSMC

 At this point, it should be possible to use the File dropdown window to
load Lib_Pads.mag which has 10 pads instantiated and they are all unexpanded
by default.

    The next step is to select PadGnd by clicking with the box tool inside
the PadGnd and typing e to expand it. Next select the metallization itself
at the top of the pad and zoom in until the screen is almost full.

    At this point, put a um grid using the command "grid 10um 10um" and one
can see the metallization of the ground pad is about 73 microns square. If
one then switches to the wiring tool and clicks on the same ground pad, then
magic says it is 600 units wide.

    So I did this to make a point and then make a suggestion.

1. Magic reads in the bondpads file properly from Jeff Sondeens web site and
runs with the SCN5M_DEEP.12.TSMC technology file, which is, I believe
.25micron, 5metal, Taiwan Semi and their are no DRC errors with this file
(thats really good news for both the mosis file and magic)

2. Its really tough to figure out dimensions. I had to jump through a couple
of hoops and not believe the wiring tool when it is telling me "units". I
really think that magic would be improved by creating a ruler capability in
microns (or even say, femto-cubits) that makes it easy to figure out just
how large (or small) something is.

With highest regards to magic hackers, Charles

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