Jesse Off wrote:
> Interesting board. Did you use all GNU/GPL software for schematic
> capture and board layout also?
Actually I have a 9302 design in which I've used GPL
tools for both capture and layout.
It has been collecting dust since early last year
when I let it slide in part due to 2.6 support seeming
to bog down at the time. Anyway things appear to be
moving quite well and thus figured I should finally
tie it off, get a few boards fabed and the works
vetted.
As is stands it is a fairly simple 3000x5000mil 4
layer board with the usual complement of 2x sdram,
flash, usb, async, ethernet, buffered addr+data bus
along with the balance of 9302 resident I/O available
for use off the board. My goal was to have a
generically useful (if somewhat minimal) board by
itself but be able to add daughter boards of various
types to include CF/SD/IDE, I2S, USB client, POE, IR,
and whatever else gets thunk up. But I had a bit of
a dilemma deciding exactly what to put on the mainboard
vs. prospective daughter boards.
In order to provide for the possibility of battery
operation switching regulators were used to generate
ring and core rails from an assumed main 5v rail.
Programmable logic devices were avoided to keep the
barrier to entry low for those who would roll their
own. There was also the loose goal of an <$50 basic
BOM cost (in quantity). And of course the design and
board layout was intended to be available under GPL or
equivalent.
So I'd like to float a request to folks who may be
interested in providing a wish list of what in their
view is a "must have" on the main board and what can
be deferred to a daughter card. The board is currently
laid out with less than aggressive designs rules and
still has some reclaimable real estate so further
modification is possible. To get a feel where this
is at, I've parked a recent snapshot here:
http://groups.yahoo.com/group/linux-widgets/files/
login: linux.widget
pw: w3lcom3
Any and all constructive comments are most welcome.
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