Talk with the team at ADI ..Automata Design Design....Herndon
Virgiinia
                                              703-742-9400  ext 21  Bob
Lowery  President/CEO
        Absolutely GREAT Folks!!!  witha great product ...or two!!!!

We have used their CAM tools for yesrs  ADI DRC    and ADI XNetview for our
vallidation and analysis of gerber data vs the CAD database...........with
netlist compare..and other greta features..


Dave Blake
Mgr ECAE Physical Tools              Compaq Computer Corp
281-514-9965                                  20555 SH 249
Fax 281-514-9541                           Houston Texas 77070
[log in to unmask]             CCA8 - 8440

-----Original Message-----
From: Ed Cosper [mailto:[log in to unmask]]
Sent: Monday, May 24, 1999 2:24 PM
To: [log in to unmask]
Subject: Re: [TN] Fab E/T Gerber comparisons


Hi all,

Got a question regarding electrical test net list Vs Gerber data. Our
existing software package ( Tibor Darvis ) will generate a net list file
from supplied gerber data. They call this snap grip and it is used as a base
line for comparing net list ends to edited gerbers. The purpose is to have a
customer supplied base line end point configuration to compare against after
you have panelized and optimized customer supplied one up gerber data.

My question is this. Does anyone know if there is a software medium that
compares the end item gerber data to the design schematic?  Basically my
customer is asking me if I have a way to detect any designs problems in his
supplied gerber files  as it relates to the original design intent. Based on
my conversations with my customer, apparently he has had problems in the
past where a person or company that originated some plots inadvertently
built in a short which our net list test didn't detect. He indicated that he
could provide the IPC-D-356 net list file and feels that if we check the
gerbers against this file we should detect any difference. However, It is my
understanding that the D-356 net list file is generated from gerber data and
should not be different.

Any thought or help would be appreciated.

Ed Cosper

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