Hi,

----- Original Message ----- 
From: "Steve Wiseman" <steve@steves-house.org.uk>
To: <balloon@balloonboard.org>
Sent: Thursday, September 16, 2004 7:30 AM
Subject: [Balloon] CF slots on Balloon3


>
> Right, ballooners & potential Ballooners...
> Compact Flash slot(s) are a bit contentious. I'm currently hoping (but not
> guaranteeing) to fit 2 slots to Balloon3. However, there is (almost) no
> chance of supporting 5V cards, only 3V. Since I posess exactly two CF
> cards, I don't know how much of a limitation the 3V-only will be. Has
> anyone with a microdrive any information on its requirements? Same goes
> for other CF cards - wireless, Bluetooth, Ethernet, etc. (Similarly,
> sketches of the bulges on the end of CF cards - antennas, connectors, etc)
> that people would be hoping to use, would be interesting, to reduce the
> likelyhood of mechanical clashes between CF cards (which plague my laptop
> PCMCIA slots...)
> The second limitation is that I don't plan to support hot-swapping for
> Compact Flash. I expect the CF slots to be filled at the factory, rather
> than ever being exposed to end users. With PXA27x, USB should be able to
> support a huge range of random plugged-in toys, and allow them to be
> hot-swapped on a whim.
> The support to make CF (reliably) hot-swappable will cost, in pins,
> board-space, PCB complexity and design time. If anyone has a usage model
> for Balloon which needs hot-plug on the CF slots, can they please make
> their argument now, to try to convince me?
> It's also of note that I have a fearsome amount of non-Balloon work lined
> up for the next 6 months. (have to pay the mortgage somehow, and Balloon's
> just infill work). The plan is still to relase the prototype design for
> Balloon3 by the end of the year, but I would be very interested to hear if
> anyone is relying on that date.


Did you decide to use buried/blind vias to route this chip or microvias?

cheers,
Jamie Morken


>
> Cheers, all
>
>
> Steve Wiseman
>
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