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Date: Fri, 23 Oct 2015 20:10:27 -0800
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Subject: Re: [geda-user] A lesson from gnet-makefile
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On Thu, Oct 22, 2015 at 9:02 AM, Larry Doolittle <ldoolitt AT recycle DOT lbl DOT gov>
wrote:

> DJ -
>
> On Thu, Oct 22, 2015 at 12:43:15PM -0400, DJ Delorie wrote:
> > One of our old problems is "how to tell where a short really is".
> > Perhaps that problem and "where is a star ground" are really the same
> > problem?  We'd just need some way of saying "we expect these nets to
> > be shorted".
>
> No, that's the wrong answer, since it's exactly the same as having
> one net.  We're looking for a way to say "we expect these nets to be
> shorted _in_exactly_one_place".  And an acceptable solution involves
> specifying where that place is.
>

Having been working on DRC lately I can confirm that this would be
extremely painful to implement.  I don't think its worth it, compared to
putting a symbol into the schematic to record the limited nature of the
connection as John suggests.  This approach avoids any new implementation
work and maintains as invariant the normal meaning of connectivity at the
interface level.

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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Thu, Oct 22, 2015 at 9:02 AM, Larry Doolittle <span dir=3D"ltr">&lt;=
<a href=3D"mailto:ldoolitt AT recycle DOT lbl DOT gov" target=3D"_blank">ldoolitt AT recy=
cle.lbl.gov</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">DJ -<br=
>
<div><div class=3D"h5"><br>
On Thu, Oct 22, 2015 at 12:43:15PM -0400, DJ Delorie wrote:<br>
&gt; One of our old problems is &quot;how to tell where a short really is&q=
uot;.<br>
&gt; Perhaps that problem and &quot;where is a star ground&quot; are really=
 the same<br>
&gt; problem?=C2=A0 We&#39;d just need some way of saying &quot;we expect t=
hese nets to<br>
&gt; be shorted&quot;.<br>
<br>
</div></div>No, that&#39;s the wrong answer, since it&#39;s exactly the sam=
e as having<br>
one net.=C2=A0 We&#39;re looking for a way to say &quot;we expect these net=
s to be<br>
shorted _in_exactly_one_place&quot;.=C2=A0 And an acceptable solution invol=
ves<br>
specifying where that place is.<br></blockquote><div>=C2=A0</div><div style=
=3D"">Having been working on DRC lately I can confirm that this would be ex=
tremely painful to implement.=C2=A0 I don&#39;t think its worth it, compare=
d to putting a symbol into the schematic to record the limited nature of th=
e connection as John suggests.=C2=A0 This approach avoids any new implement=
ation work and maintains as invariant the normal meaning of connectivity at=
 the interface level.</div></div><br></div></div>

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