Thanks that someone spells it out like it is !
Wolfgang
-----Original Message-----
From: Martin <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, September 24, 1998 12:01 PM
Subject: [DC] Gerber / PWB Design Viewers - Searching for
>Fred,
> I just recently joined this news group so I feel like I am coming
>into the middle of a conversation. If I missed something said earlier,
sorry.
>
> 1) A Gerber file is basically a list of "brush strokes" that can be
>interperted by photo plotters, printers, and other output devices. The
>advantage here is that the Gerber file is not dependant on the generating
>tools. Oh, sometimes there are difficulties with the various revisions of
>the Gerber standard, but any board fabricator worth thier salt can handel
>whatever the customer sends them. So, in short, a Gerber viewer should not
>care were the Gerber file came from, so long as the Gerber file is a
>revision the viewer knows.
>
> 2) Since a Gerber file is a series of brush strokes, there is no
>netlist information, nor component information, stored in the file. A given
>viewer might be able to high-light all overlaping brush strokes, giving the
>illusion of a net, but it couldn't identify a component so there would be
no
>conection information. So, unless there has been a revision to the Gerber
>standard that I haven't heard of, you can not make a reliable net list from
>the Gerber file.
>
> 3) See number 2.
>
>>Date: Wed, 23 Sep 1998 20:25:02 -0700
>>From: Fred Marshall <[log in to unmask]>
>>Subject: Gerber / PWB Design Viewers - Searching for
>>
>>Thanks to the folks who answered my recent question:
>>
>>"Can anyone recommend a Gerber Viewer that will allow a designer to
>>"light up" a single net at a time - that sort of thing?"
>>
>>What wasn't quite clear to me in many of the answers was:
>>
>>1) are the viewers dependent on the tools that were used to generate
>>the design or not?
>>
>>For example, some tools extract a netlist from the Gerber data and then
>>can "light up" a net or set of nets - but, it seems that some others
>>might rely on a netlist input. I may or may not have a netlist input of
>>the proper form for the tool being recommended. Thus this new question.
>>
>>2) Is the recommended tool capable of dealing with a variety of input
>>types and capable of generating a netlist on its own?
>>
>>3) Is there any reason why blind vias might perturb the process of
>>extracting a netlist?
>>
>>Thanks!
>>--
>>Fred Marshall
>>VP Engineering
>>RGB Spectrum
>>950 Marina Village Parkway
>>Alameda, CA 94501
>>(510) 814-7000
>>
>-------------------
>Martin Spizman
> MEYER SOUND LABS
> (510) 486-1166
> [log in to unmask]
>
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