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From:	karl AT aspodata DOT se
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] ATXmega symbols
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Comments:	In-reply-to Kai-Martin Knaak <knaak AT iqo DOT uni-hannover DOT de>
	message dated "Tue, 27 Jan 2015 02:15:24 +0100."
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Date:	Wed, 28 Jan 2015 18:27:43 +0100 (CET)
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Kai-Martin Knaak:
> karl AT aspodata DOT se wrote:
...
> ... and make the '3 symbol so that it is a '1 symbol sans the additional 
> pins of the larger package... Hmm. This would allow for a neat upgrade.  

Yes, I got the idea from Bdale Garbee:
 http://www.delorie.com/archives/browse.cgi?p=geda-user/2012/07/09/22:33:56

> But symbols for the 44 pin package would be rather over-sized.

Yes, there is always some tradeoff.

> How about this: 
>  * Start with a 'monolithic' symbol for the 44 pin package
>  * The symbol for the 64 pin package is split in two. One sub symbol 
> contains all the pins that this version shares with the '4 chip. And a 
> second sub symbol for the pins of the additional ports.
>  * The symbol for the 100 pin package is split in three. The first two for 
> the pins that match the 64 pin version. And a third sub symbol for the 
> rest. 
> 
> That way, the additional pins of larger versions can be placed out of the 
> way of nets connected to the lower port pins.

Could work, one have to try it out to get the feel of the pros and cons.
And the tradeoffs could be different for different persons and projects.

Regards,
/Karl Hammar

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