Hi guys,
Valor has a tool that does this.
However many companies that do not use Valor, or have scripts written to
extract netlist signal name intelligence, send netlist data to the board
suppliers
under non-disclosure agreements for netlist to Gerber comparison.
This sure beats the golden board technique which we've all been burned by at
least once in the past!

Rgds,
Mike

-----Original Message-----
From: Robert D. Green [mailto:[log in to unmask]]
Sent: Monday, May 24, 1999 1:23 PM
To: [log in to unmask]
Subject: [TN] Re[2]: [TN] Fab E/T Gerber comparisons



     I too, would like to know if any such tool exists.  The D-365 file is
     generated at the same time as the gerbers by the layout/design
     checking software, hence there should be no difference.

     What there needs to be is a piece of software that will run the
     IPC-D-365 netlist against the original electrical schematic capture
     software such as ORCAD or ViewLogic.

     (or am I cooked again you CAD guys?)

     -------------------------------------------------------------
     Robert D. Green - Supervisor, Test Engineering
     Hadco - Value Added Manufacturing
     e-mail [log in to unmask]



______________________________ Reply Separator
_________________________________
Subject: Re: [TN] Fab E/T Gerber comparisons
Author:  Ed Cosper <[log in to unmask]> at smtplink-hadco
Date:    5/24/99 3:24 PM


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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