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Date: Mon, 21 Sep 2015 08:38:36 -0700
Message-ID: <CAOP4iL0j_9-HdUOJDCpJb-F0eWFUyxawCRaBvTHC7tgML_mfpA@mail.gmail.com>
Subject: Re: [geda-user] New experimental netlist features (multiple pins one net)
From: "Ouabache Designworks (z3qmtr45 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Mon, Sep 21, 2015 at 7:43 AM, Nicklas Karlsson (
nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com] <
geda-user AT delorie DOT com> wrote:

> > On Wed, 9 Sep 2015, Edward Hennessy (ehennes AT sbcglobal DOT net) [via
> geda-user AT delorie DOT com] wrote:
> > > Would this proposed feature also work for connecting a single pin to
> > > multiple pads? For example, could three pin symbols for transistors
> work
> > > with devices that have four pads? It would be nice to support all the
> > > relationships:
> > >
> > > - one to one
> > > - one to many (3 pin symbol transistor with a 4 pad footprint)
> > > - many to one (pass thru pins)
> > > - many to many
> > >
> > > Pass thru pins could make the symbols for parts where the signal passes
> > > straight through easier to work with. For example, TVS diode pairs,
> feed
> > > thru capacitors, and transistors used in current mirrors.
> >
> > The feature isn't about connected pins/pads on a footprint at all; it's
> > about grouping multiple nets (or pins) graphically into a single bus net
> > (or bus pin).
> > ...
>
> This is about grouping nets together in a bus it would however be rather
> useful with one pin in the symbol then there are several physical pins on
> the package on the real circuit. It is for example very common with several
> ground pins and in such case it would be possible with a schematic figure
> with only one ground pin.
>


If your package has multilple grounds then your symbol must also have them.
They may all be the same node but I have some beefy ground traces between
the power supply and drivers that I do not want to tie my sensitive analog
grounds pins.

Once you have a package where two pins have the same pinname then you have
to switch everything over to use pinnumbers instead of pin names.

John Eaton

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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Mon, Sep 21, 2015 at 7:43 AM, Nicklas Karlsson (<a href=3D"mailto:ni=
cklas DOT karlsson17 AT gmail DOT com">nicklas DOT karlsson17 AT gmail DOT com</a>) [via <a href=
=3D"mailto:geda-user AT delorie DOT com">geda-user AT delorie DOT com</a>] <span dir=3D"l=
tr">&lt;<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-use=
r AT delorie DOT com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" st=
yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">&gt; =
On Wed, 9 Sep 2015, Edward Hennessy (<a href=3D"mailto:ehennes AT sbcglobal DOT ne=
t">ehennes AT sbcglobal DOT net</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com"=
>geda-user AT delorie DOT com</a>] wrote:<br>
&gt; &gt; Would this proposed feature also work for connecting a single pin=
 to<br>
&gt; &gt; multiple pads? For example, could three pin symbols for transisto=
rs work<br>
&gt; &gt; with devices that have four pads? It would be nice to support all=
 the<br>
&gt; &gt; relationships:<br>
&gt; &gt;<br>
&gt; &gt; - one to one<br>
&gt; &gt; - one to many (3 pin symbol transistor with a 4 pad footprint)<br=
>
&gt; &gt; - many to one (pass thru pins)<br>
&gt; &gt; - many to many<br>
&gt; &gt;<br>
&gt; &gt; Pass thru pins could make the symbols for parts where the signal =
passes<br>
&gt; &gt; straight through easier to work with. For example, TVS diode pair=
s, feed<br>
&gt; &gt; thru capacitors, and transistors used in current mirrors.<br>
&gt;<br>
&gt; The feature isn&#39;t about connected pins/pads on a footprint at all;=
 it&#39;s<br>
&gt; about grouping multiple nets (or pins) graphically into a single bus n=
et<br>
&gt; (or bus pin).<br>
&gt; ...<br>
<br>
This is about grouping nets together in a bus it would however be rather us=
eful with one pin in the symbol then there are several physical pins on the=
 package on the real circuit. It is for example very common with several gr=
ound pins and in such case it would be possible with a schematic figure wit=
h only one ground pin.<br>
</blockquote></div><br><br></div><div class=3D"gmail_extra">If your package=
 has multilple grounds then your symbol must also have them. They may all b=
e the same node but I have some beefy ground traces between the power suppl=
y and drivers that I do not want to tie my sensitive analog grounds pins. <=
br><br></div><div class=3D"gmail_extra">Once you have a package where two p=
ins have the same pinname then you have to switch everything over to use pi=
nnumbers instead of pin names.<br><br></div><div class=3D"gmail_extra">John=
 Eaton<br><br><br></div><div class=3D"gmail_extra"><br></div></div>

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