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Mail Archives: geda-user/2019/01/30/08:29:58

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Date: Wed, 30 Jan 2019 14:27:49 +0100 (CET)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Girvin Herr (gherrl AT fastmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] Refdes bug or Master Attribute Document on the Wiki
needs update.
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On Tue, 29 Jan 2019, Girvin Herr (gherrl AT fastmail DOT com) [via 
geda-user AT delorie DOT com] wrote:
> According to the Master Attributes Document (aka List), under "refdes" - 
> "refdes naming restrictions", there is a bulleted list under 
> "Specifically, gsch2pcb requires:". The 3rd bullet states that "Any 
> lower case suffix is ignored. This is so you can, place four discrete 
> NAND gates on the schematic called U1a, U1b, U1c and U1d. They will 
> netlist into a single footprint named U1."
>
> My experience is that this is not true. The lower case suffix is not 
> ignored and propagates into the netlister and the outputs of gsch2pcb, 
> causing problems in PCB. This feature has been in the document at least 
> since 2015. Either this is a bug and should be fixed, or this feature 
> should be deleted from the Master Attributes List document.

I always wondered about this mechanic.  As far as gEDA/gaf is concerned, 
only components which share a common refdes are part of one package, so 
U1a, U1b etc. are individual packages.  Any logic that deviates from this 
would be specific to PCB and/or gsch2pcb.

In what kind of situation would you want to merge components with 
individual refdes' into a single package?  Or, spelled differently, why 
would you want to assign individual refdes' to a package's components?

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