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Date: Thu, 22 Oct 2015 09:07:51 +0200
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] A lesson from gnet-makefile
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> On Thu, Oct 22, 2015 at 02:03:43AM +0000, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> > On Thu, Oct 22, 2015 at 1:49 AM, DJ Delorie <dj AT delorie DOT com> wrote:
> > > It would be great if you could just connect two
> > > nets like that and have the system remember the topology long enough
> > > to DTRT in layout.  But in gEDA, this type of connection only results
> > > in an error.
> > 
> > Well I was approaching that with the stuff I was talking about in the
> > other thread but I realized there were fundamental issues with it.
> > This is kind of why I was thinking about star grounds. Really this is
> > a type of star topology.
> 
> I don't think this failing is unique to gEDA.  I just had a
> board laid out in PADS (schematic in gschem), and some analog
> stuff had to be left hand-wired, non-design-rule-checked, because
> of this exact issue.  Just like in PCB, there seemed to be no way
> to communicate to the layout tool that two nets are supposed to
> touch in a defined spot, but be independent.
> 
> I think it's easy enough to create a "star" component in gschem;
> getting a layout tool to deal with it seems harder.  I've heard
> of hacks involving extra layers to make it happen in PCB.  The
> team of PADS experts (not sure if a smiley face belongs there or
> not) couldn't even imagine a way to make it happen for that tool.
> Other than adding a bunch of zero Ohm resistors, which I rejected.

Yes, only problem with star ground symbol in gschem is how many pins it should have. In pcb for many cases it would make sense with one common connection point.

Nicklas Karlsson