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Subject: Re: [geda-user] gshem 1.8.2 Bug? Slotting fails for a custom BPX85
 photo-transistor array
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 <alpine DOT DEB DOT 2 DOT 20 DOT 1709121647020 DOT 5445 AT nimbus>
From: "Barry Jackson (zen25000 AT zen DOT co DOT uk) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Date: Wed, 13 Sep 2017 12:07:41 +0100
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On 12/09/17 16:00, Roland Lutz wrote:
> pinnumber= and pinseq= are entirely different concepts.
> 
> Normally, you'd want to use the pinnumber= attribute; there's no reason 
> to add a pinseq= attribute unless you need it.  The pinseq= attribute is 
> only used in two situations: slotted components and some simulation 
> backends.
> 
> In a slotted component, each pin with a pinseq= attribute is assigned a 
> pinnumber= attribute from the slot definition.  The original pinnumber= 
> attribute is ignored; in fact, there's no reason to add one in the first 
> place.  The pinseq= attribute specifies which of the numbers in the slot 
> definition is used for this pin.
> 
> So, in your example, the correct attributes are:
> 
> Component:
>    slot=1
>    slotdef=1:1,10
>    slotdef=2:2,9
>    slotdef=3:3,8
>    slotdef=4:4,7
>    slotdef=5:5,6
> 
> First pin:
>    pinseq=1
>    (pintype and pinlabel as appropriate, if needed)
> 
> Second pin:
>    pinseq=2
>    (pintype and pinlabel as appropriate, if needed)
> 
> If you wanted, you could list the pins in the slot definition in reverse 
> order (10,1; 9,2; and so on) and swap the pinseq= attributes; this would 
> have the same effect.
> 
> 

Thanks Roland, that now makes much more sense to me.

I could see that virtually all the information needed for a slotted 
device was contained in the slotdef= attributes so I could not 
understand why all the docs I have read on symbol creation state that 
each pin MUST have pintype, pinnumber, pinlabel and pinseq attributes, 
which is apparently just plain wrong according to your explanation.

Cheers
Barry