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Date: Tue, 8 Dec 2020 16:20:12 +0100 (CET)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Klaus Rudolph (lts-rudolph AT gmx DOT de) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
Subject: Re: [geda-help] using net names on multiple sub schematics used by
 single symbol
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On Tue, 8 Dec 2020, Klaus Rudolph (lts-rudolph AT gmx DOT de) [via geda-help AT delorie DOT com] wrote:
> It was in the docs in the past. But I only find a old pdf
> http://www-mdp.eng.cam.ac.uk/web/CD/engapps/geda/geda-doc/gschem/gschem.pdf.
>
> Is there somewhere an actual one available?

That's interesting; I didn't know about this document.  There is a "gEDA 
gschem User Guide" in the wiki, but it appears to be a completely 
different text.

Does anyone know what has become of it?


> Currently the git.geda-project.org/geda-gaf is online again.

I pushed the updated `stable-1.10' branch there, as well.


> If I replace older refdes= to the "newer" portname= it works fine. But
> in which case I can/should use netname= attribute?
>
> I was not able to get an example working with using netname=

Components with a netname= attribute are considered power symbols, i.e., 
their only pin is connected to a named net.  Typical examples for this 
would be "netname=GND" or "netname=3.3V".  The older way of doing this is 
using a "net=3.3V:1" attribute, but this has the disadvantage that you 
can't use that attribute as the visible text without having an ugly ":1" 
suffix.  With the netname= attribute, you can draw a single "power rail" 
symbol and change the attribute value to whichever power rail you want it 
to connect to.  (In practice, you'll probably want to have a separate, 
visually different symbol for GND.)


> P.S. If you like a can share my little example and we can add the
> netname= attribute to this example and make that public?

Sure!


Roland