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Date: Wed, 30 Jan 2019 18:36:57 +0100 (CET)
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From: gedau AT igor2 DOT repo DOT hu
Subject: Re: [geda-user] Refdes bug or Master Attribute Document on the Wiki
 needs update.
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On Wed, 30 Jan 2019, Roland Lutz wrote:

> On Wed, 30 Jan 2019, gedau AT igor2 DOT repo DOT hu wrote:

> With gEDA/gaf, this wouldn't work.  You'd either have to define separate
> symbols for each slot, or use gEDA/gaf's slotting mechanism and set slot=1,
> slot=2 etc. on each component to change its pin mapping to a given slot.
>
> If you have defined the slot number in slot= anyway, why would you want to
> duplicate it in the refdes?  (This is a serious question.)

You wouldn't have a slot= in the other setup, only refdes suffixing. It's 
just a different way doing it. I didn't say gschem or pcb should do it. 
It's just an existing convention elsewhere.

As an user I'm fine with a "slot=" kind of solution as well as with a 
refdes suffixing solution. xschem for example does refdes suffixing for 
slotting, like U1:1, U1:2 and in the tEDAx netlist we get the merged 
version of U1 (plus extra slot info so that later on pcb-rnd can do slot 
swapping and back annotation on that).

pcb and/or gsch2pcb and/or the pcb backend (gnetlist) may have traces of 
the suffixing assumption from some age when someone thought it would be a 
good idea to have it in gEDA too. (pcb-rnd doesn't have a special case for 
lower case last letter of refdes - if some old corner of the code has it, 
it's a bug that I'd fix when reported).

So the question of "why would you want to do that" is the same for 
"slot=". And my (user) answer is: I don't care, as long as it works 
reasonably well, I use whichever the software offers.

Regards,

Igor2