X-Authentication-Warning:	delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient:	geda-user AT delorie DOT com
X-Original-DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed;
	d=gmail.com; s=20120113;
	h=date:from:to:subject:message-id:in-reply-to:references:mime-version
	:content-type:content-transfer-encoding;
	bh=oyxVmvJPmkJhJnyP/bwkx7F4+ksL4Z+WwcyiZjkCLrA=;
	b=gliTxiuV7oXzTyYZxZmSQf4Hy8hrWs8Gn18c+ogt+WxV31dudh+Nb8rxeQ0N4WvruE
	18AtIlovsEgJ5CxMmDx1uFpDVsUpP7phxtmn87yunVmZQQNwP+4FhhaUnuegDlLLiCBm
	zQNlLLOY2C75Y3fLYfXC2nISjk8/G6ejeY8xZb7ioiMj+vQ8TdOUJnEasWa1i9/ZLooX
	FqDYtbzJW1BK62J3trWdr1ODLuiWcvPrFjr8+klARp3C+JDG5LqwD6dqG01fy3Yn1UCs
	6YOHjqGg2NNzX5F0J/RqAy6lfGuWm7UTVWLHT6Zc1NYCiEgK0TKc0LCvAH/VI4Ap0IJu
	fVkw==
X-Received:	by 10.28.171.135 with SMTP id u129mr62800738wme.99.1451420121159;
	Tue, 29 Dec 2015 12:15:21 -0800 (PST)
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)
Message-Id:	<20151229211516.583ca6d4ab4b3cccc522e72d@gmail.com>
In-Reply-To:	<CAM4zO3rAgR79y6CJQe4AyXBSmsY+CMTyDkpUGKhiB0Ns+rhh0g@mail.gmail.com>
References:	<CAJXU7q_3XwthnN_8mp7B+-ShHeK+=7J=54ZavKBUG3S3bSKp2A AT mail DOT gmail DOT com>
	<CANEvwqiM7CKG+WpDRpG4L=HsmSEZ32=CBDyUhuk3ks-SNedL2Q AT mail DOT gmail DOT com>
	<43CC8F96-6452-40FA-9DFB-E0983721C19C AT noqsi DOT com>
	<alpine DOT DEB DOT 2 DOT 00 DOT 1512290406210 DOT 9035 AT igor2priv>
	<20151229094603 DOT 782092b57563336883546bfd AT gmail DOT com>
	<CAM2RGhQ363RydhBJKMnNX5sLOkD1K4qVwb-PPwov3MT3D6MfdQ AT mail DOT gmail DOT com>
	<CAM4zO3rAgR79y6CJQe4AyXBSmsY+CMTyDkpUGKhiB0Ns+rhh0g AT mail DOT gmail DOT com>
X-Mailer:	Sylpheed 3.5.0beta1 (GTK+ 2.24.25; x86_64-pc-linux-gnu)
Mime-Version:	1.0
Reply-To:	geda-user AT delorie DOT com
Errors-To:	nobody AT delorie DOT com
X-Mailing-List:	geda-user AT delorie DOT com
X-Unsubscribes-To:	listserv AT delorie DOT com

> > 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

- Raw text -