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To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Re: Objects of objects
In-reply-to: <CACPio-5xm2w_4DrP=APsp4tFb6Q0xeGnt0G3xVik+++-Y2rG4Q@mail.gmail.com>
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Comments: In-reply-to Nathan Stewart <therealnathanstewart AT gmail DOT com>
   message dated "Tue, 20 Nov 2012 10:29:19 -0500."
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Date: Tue, 20 Nov 2012 16:50:03 +0100 (CET)
From: karl AT aspodata DOT se (Karl Hammar)
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Nathan:
> On Mon, Nov 19, 2012 at 7:46 PM, Kai-Martin Knaak <kmk AT familieknaak DOT de>wrote:
> > karl AT aspodata DOT se (Karl Hammar) schrieb am  2. November 2012:
> > there are two more general concepts that are missing in gschem format:
> >
> > 1) parameters that can be passed to sub sheets
> >
> > 2) a way to manipulate the parameters during interpretation of the
> > schematics by gnetlist.
> >
> > ---<)kaimartin(>---
> > --
> > Kai-Martin Knaak
> >
> 
> Agreed - something else that objects of objects would get us is 'slotting'
> of subcircuits.

Can you explain what you mean ?

> At the moment the example I was thinking of escapes me, but
> I think it was related to the question I asked a while back about doing
> alternate PCB layouts. Actually now that I mention that, one such use of
> parameters might be to associate a circuit with a PCB layout. So if I've
> already done the layout for my super duper high side current monitor, or
> 4th order Bessel HPF, and some reference to the layout can be put in an
> attribute, when I import into PCB, it can just suck those sections of
> layout in already done.

That would be a change to pcb, we are still discussing what can be done 
at the schematic level.

> Another feature that I think would be really useful  is some kind of
> concept of a reference or symbolic link to other components. So if I decide
> to change my vendor_partnumber or even value, all 743 instances of that
> component would change. You'd also want a way to make and break links if
> you so chose.

Can't you just do a simple

$ ln -sf new.sym 743.sym

and only use 743.sym in your schematics, dito for pcb, plus some kind
of update the board.

Regards,
/Karl Hammar

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