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Subject:	Re: [geda-help] using net names on multiple sub schematics used by
	single symbol
To:	geda-help AT delorie DOT com
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	<alpine DOT DEB DOT 2 DOT 21 DOT 2012041901490 DOT 1174 AT nimbus>
From:	"Klaus Rudolph (lts-rudolph AT gmx DOT de) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
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Date:	Tue, 8 Dec 2020 12:50:37 +0100
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Hi Lutz,

Am 06.12.20 um 22:21 schrieb Roland Lutz:
> Hi Klaus,
>
> On Fri, 4 Dec 2020, Klaus Rudolph (lts-rudolph AT gmx DOT de) [via
> geda-help AT delorie DOT com] wrote:
>> gschem supports multiple sub schematics in a single symbol, simply by
>> inserting multiple "source=xxx.sch" attributes.
>>
>> From gschem this works fine. Pressing "S" to go into the hierarchy
>> opens the first sub schematic and navigate with "page up" "page down"
>> works as expected.
>
> yes.  This is a little-known feature which I didn't know about myself
> until I found it in the sources.  I'm happy someone is actually using
> it. :-)

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?


>
>> error: net name conflict across hierarchy: net name `A2/SIG1' is used by
>> net `SIG1' on page `A2/' and by net `SIG1' on page `A2/'
>> error: net name conflict across hierarchy: net name `A1/SIG1' is used by
>> net `SIG1' on page `A1/' and by net `SIG1' on page `A1/'
>
> There was an error in the way gnetlist handles package and refdes
> namespaces in components with multiple subschematics.  I fixed it in the
> branch `stable-1.10' on GitHub (geda-project.org appears to be down at
> the moment).  You can clone it from:
>
>      https://github.com/rlutz/geda-gaf

Great! Currently the git.geda-project.org/geda-gaf is online again. It
seems that also delorie.com was removed from nameservers at the weekend.
OK, no problem, add your repo as secondary remote and was able to fetch
your changes. Thanks a lot!!!!!

>
>
> BTW, port symbols aren't designed to be used with net= attributes.
> There are two distinct kinds of connections between schematics:
>
>    (a) one net spanning multiple same-level schematics

Yepp! That is quite easy, simply use the same net= attribute in the same
hierarchy of the sub schematics. I checked it and it works as expected.

>
>    (b) the pin of a component being connected to a port in a subsheet
>
> Port symbols are used for case (b) while power symbols (or simply named
> nets) are used for case (a).
>
> I'd recommend using "new-style" power and port symbols: instead of a
> refdes= attribute, you can specify a single netname= or portname=
> attribute which indicates the net (or port) to which the component is
> connected.

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=

It may be a good idea to share a minimal example with sub schematics
which uses all of these features, even with shared / slotted devices.

I did a little example this morning and run with your last changes and
it works fine.

Thank you very much!
  Klaus

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?

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