 
| Subject: | |
| From: | |
| Reply To: | TechNet E-Mail Forum. |
| Date: | Tue, 25 May 1999 07:54:47 -0400 |
| Content-Type: | multipart/mixed |
| Parts/Attachments: |
|
|
Hi Ed...
The IPC-D-356 file he supplies you should not be generated from the
gerbers, it should be generated from the CAD database. You would then
need to generate a netlist from the "gerbers" you produce and compare
the two. You're on the right track with the comparison you're doing
after edit and panelization. Take the next step and compare it to the
supplied -356 from your customer. If TD doesn't have this "compare"
built in, there are third party packages available out there. Drop me
a line if you need a name or number....
regards,
Tom
______________________________ 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
<!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN">
<HTML>
<HEAD>
<META content=text/html;charset=iso-8859-1 http-equiv=Content-Type>
<META content='"MSHTML 4.71.1712.3"' name=GENERATOR>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT color=#000000 size=2>Hi all,</FONT></DIV>
<DIV><FONT color=#000000 size=2></FONT> </DIV>
<DIV><FONT size=2>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.
</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>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 <FONT
color=#000000>generated </FONT>from gerber data and should not be different.
</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Any thought or help would be appreciated.</FONT></DIV>
<DIV><FONT size=2></FONT> </DIV>
<DIV><FONT size=2>Ed Cosper</FONT></DIV></BODY></HTML>
|
|
|
