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Date: Thu, 20 Dec 2012 12:08:08 +0100
From: Gabriel Paubert <paubert AT iram DOT es>
To: geda-user AT delorie DOT com
Subject: Re: Define exactly what the DRC does (was: Re: [geda-user] Find
 rat lines)
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 <20121220011650 DOT 8613 DOT qmail AT stuge DOT se>
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On Thu, Dec 20, 2012 at 02:16:50AM +0100, Peter Stuge wrote:
> Richard Barlow wrote:
> > Technically what the DRC does currently is correct, it ensures the
> > design follows the design rules. However from a usability point of
> > view, not having a single central place to provide a list of
> > problems with the design is bad.
> 
> Perhaps make a new single central place, rather than adding more
> things to the current DRC which is already technically correct.

What I'd like is to have the ability to run the DRC on only a part
of the board, or to be able to exclude a part of the board from the
DRC. Some fab houses specify design rules in which some percentage
of the board may have tighter rules (very useful for escaping
BGA, especially at 0.8mm and tighter pitches). For example:

http://www.atlantec.fr/images/stories/downloads/DRC_table.pdf

gives a "local fan out density (allowed on 10% of the surface)".

	Gabriel