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Date: Tue, 29 Dec 2015 21:15:16 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Project leadership (design error in the core of
 gschem)
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> > slots:
> > The slotting mechanism is fundamentally worthless for a the majority
> > of cases were I would want to use it. Look at the 7400 symbols were
> > they have a whole extra symbol for the power pins. That is
> > conceptually IMHO something that should be a slot but you can't do
> > that because all symbols have to have the same number of pins and
> > geometry.
> >
> > In places were slotting could be cool we don't use it right in the
> > standard symbol library. Take the symbols for the larger xilinx chips.
> > I would rather each section of the chips I/O be it's own slot so I can
> > show the FPGA connections near what they are connected too instead of
> > putting the FPGA on it's own page (most of the time). Likewise
> > breaking it up into more symbols would mean not wasting most of a page
> > on the empty area inside the FPGA symbol.
> >
> >
> >
> I'm having a little trouble understanding what your definition of "slots"
> is.  I think the current gschem concept of a slot is what I am used to,
> i.e. a slot is an interchangeable element of a chip.  So a 7400 has 4 nand
> slots, and they are identical.  As far as I am concerned, slots are only a
> tool for back annotation.  During schematic capture, you can assign the
> gates from a chip in any order, then when laying out the PCB, you can
> choose which slot routes the best, and swap them around, and then back
> annotate.
> 
> 
> Bill

This is the way it should be ideally.

I had some arguing earlier about usefulness of pin numbers in schematic, they have meaning then mapping to a footprint but not before. Sometimes only one mapping is available but at other times there are several to choose from.

I think in most EDA tools work is started by adding complete information for a component: symbol, footprint, pin mapping, ordering information, ... In gschem only a symbol is added. The database of complete information is usefuls but I think it should be run the other way, in gschem attributes are filled in and then a suitable entry is found in the database and if not a new entry need to be created or more attributes added. This method would be especially useful then ordering information need to be changed or added.


Nicklas Karlsson