X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f X-Recipient: geda-user AT delorie DOT com Date: Wed, 9 Dec 2015 04:29:12 +0100 (CET) X-X-Sender: igor2 AT igor2priv To: geda-user AT delorie DOT com X-Debug: to=geda-user AT delorie DOT com from="gedau AT igor2 DOT repo DOT hu" From: gedau AT igor2 DOT repo DOT hu Subject: Re: [geda-user] gsch2pcb after refdes-renum? (If implemented syncronization detail) In-Reply-To: <201512082229.tB8MTJBj010408@envy.delorie.com> Message-ID: References: <56658683 DOT 401 AT envinsci DOT co DOT uk> <20151207153821 DOT c2ac19e6f24b1776a3595e4a AT gmail DOT com> <20151208091411 DOT c8968b0bedb705765529176c AT gmail DOT com> <201512081819 DOT tB8IJBrt022764 AT envy DOT delorie DOT com> <20151208205451 DOT bb2478f8722e1a885822689d AT gmail DOT com> <201512082019 DOT tB8KJOlP030874 AT envy DOT delorie DOT com> <20151208222204 DOT 6566ebed300ca2683dd71bc8 AT gmail DOT com> <201512082139 DOT tB8LdLuL005789 AT envy DOT delorie DOT com> <20151208230637 DOT b8eb6c22230d5a3b977c3ca1 AT gmail DOT com> <201512082229 DOT tB8MTJBj010408 AT envy DOT delorie DOT com> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Reply-To: geda-user AT delorie DOT com Errors-To: nobody AT delorie DOT com X-Mailing-List: geda-user AT delorie DOT com X-Unsubscribes-To: listserv AT delorie DOT com Precedence: bulk On Tue, 8 Dec 2015, DJ Delorie wrote: > >>> So already the refdes isn't a unique identifier for a symbol... >> >> In such case it is a slot and the slot number could also be used? > > Sometimes. Other times, like large MCUs, there are no slots, just > different symbols using the same refdes, which the netlisters just > merge together. > > At best, "refdes + pinnumber" may be a unique identifier, *except* > that changing the refdes and/or pin numbers changes the identifier... > and those are the things we want to change. Refdes+pin sounds like a good identifier on PCB-side, but not on gschem-side. When I use stock dual-opamp-1.sym (slotted) pin+refdes it's not unique in the sense that there are two instances of the very same power pins (4 and 8) on the schematics. If I connect Vcc to pin 4 on slot 1 and gnd to pin 4 on slot 2, I get the following netlist (in the gsch2pcb flow): Vcc U1-4 GND U1-4 Same happens without slotting. However, if I take only one slot and connect both Vcc and GND to the same pin 4, only one net remains: GND U1-4 This suggests the pcb gnetlist backend (or maybe gnetlist) already uses a per gschem-component identifier and refdes or refdes-pin doesn't fully identify a component or a pin. Regards, Igor2