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Date: Tue, 1 Sep 2015 22:01:31 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] back annotation proposal (RFC)
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On Tue, 1 Sep 2015 15:30:47 -0400
DJ Delorie <dj AT delorie DOT com> wrote:

> 
> > The problem is that there are hundreds or even thousands of
> > different resistors in my database. I could choose a thru-hole part
> > for packaging only to have the pcb layout engineer change it to
> > surface mount part or inline sip or dip array. Those changes would
> > have to be backannotated from PC layout to the original schematic.
> > 
> > So here's the problem. You frequently have to take one design into
> > multiple PCB's. Your schematic will be used in the real product so
> > it must be nice and compact with all surface mount parts. You will
> > also use the same schematic to build a "break-out-board" with
> > thru-hole parts for testing and code development.
> 
> This might be a case where a BOM drives the tools, instead of being an
> output file.  Multiple "input BOMs" could be maintained by different
> groups and merged as part of the process that generates the final
> PCAs.
> 
> And by BOM I mean "any data that helps narrow down the part selection"
> - it could be a physical list or regex's, rule set, or database of
> attribute preferences.  Whatever :-)
> 
> My blue sky proposal included the option of "some rule set" which I
> never defined, which provides project-specific defaults to help narrow
> down the list of available parts to the one actually used.  The idea
> was that the designer specified what they needed, and the layouter
> would pick from the options given.
> 


Great! On correct path.