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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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--001a11c15b50c4d9e6052043ac19 Content-Type: text/plain; charset=UTF-8 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 --001a11c15b50c4d9e6052043ac19 Content-Type: text/html; charset=UTF-8 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"><<a href=3D"mailto:geda-user AT delorie DOT com" target=3D"_blank">geda-use= r AT delorie DOT com</a>></span> wrote:<br><blockquote class=3D"gmail_quote" st= yle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">> = 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> > > Would this proposed feature also work for connecting a single pin= to<br> > > multiple pads? For example, could three pin symbols for transisto= rs work<br> > > with devices that have four pads? It would be nice to support all= the<br> > > relationships:<br> > ><br> > > - one to one<br> > > - one to many (3 pin symbol transistor with a 4 pad footprint)<br= > > > - many to one (pass thru pins)<br> > > - many to many<br> > ><br> > > Pass thru pins could make the symbols for parts where the signal = passes<br> > > straight through easier to work with. For example, TVS diode pair= s, feed<br> > > thru capacitors, and transistors used in current mirrors.<br> ><br> > The feature isn't about connected pins/pads on a footprint at all;= it's<br> > about grouping multiple nets (or pins) graphically into a single bus n= et<br> > (or bus pin).<br> > ...<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> --001a11c15b50c4d9e6052043ac19--
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