Terry,
I would be glad to provide you sample IPC D 356 formatted netlist if you
would like to see one.  The netlist format is very basic.  All of the
information is already contained in a dsn file.. Reply to me offline if you
wish me to forward a netlist

Mike Reagan
EDSI
Frederick Md

[EMAIL PROTECTED]

----- Original Message -----
From: Terry Harris <[EMAIL PROTECTED]>
To: Protel EDA Forum <[EMAIL PROTECTED]>
Sent: Friday, April 27, 2001 6:10 PM
Subject: Re: [PEDA] Export an IPC-D-356 format Netlist for PWB
MFGcircuittesting


> On Fri, 27 Apr 2001 07:55:37 -0400, you wrote:
>
> >> Bottom line, the format is a netlist as we understand a net list plus
the
> >> physical location and dimensions of the pads.
>
> I hope it isn't that simple - testers, particularly roving probe testers
> only test continuity from each end of a 'net' + any stubs. For testing
> non-continuity (shorts) they don't bother looking for shorts between nets
> which don't get close to each other. You need more than a netlist and pad
> locations to figure out net ends, stubs, and net proximity.
>
> >>It looks quite simple to
> >> write; it would be much easier to generate this from the Protel PCB
ASCII
> >> file than from gerber; all the necessary data is there in named fields,
> >> mostly in the pad records.
>
> >So here is the scoop, a spectra dsn file contains everything-  all of the
> >pads, pad shapes, and netlist information, maybe one of you hotshot
> >programmers out there can convert the dsn file to a much needed 356 file.
>
> Much needed?
>
> While Gerber is not an ideal format for generation of connectivity
> information at least it is a standard and one that PCB houses are going to
> get from all customers.
>
> If you choose to supply the board house with additional information then
it
> is your problem if it is wrong - and you are going to be less familiar
than
> the board house is with the conversion tool and less able to 'tune' it to
> suit their tester
>
> I think it would be more useful to be able to check a conectivity netlist
> against a Protel design, the PCB house gives you the netlist generated
from
> Gerbers the way they think they plotted them. That would check the
> connectivity netlist and Gerbers and check them before they have made a
> batch of possibly bad PCBs.
>
>
> Cheers, Terry.
>
>


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