USB Flash Drive to xD

I ran into the same problem a couple of years ago.

I'd used smartmedia cards before and, because the xD card has the same interface, I hoped it would work in a similar way. Cards up to 64 Mb worked fine but anything larger behaved in an unpredictable way, sometimes holding its busy pin indefinitely. I eventually gave up and used a compact flash card.

I found it impossible to find a datasheet. It seems that neither Olympus nor Fuji will release any useful information.

Richard

ng

Can't help much, but I do know the USB power requirements are provided in the official specifications. For USB 1.0 devices, I believe the current was limited to 500mA -- but this upper limit is often adjusted downward after device enumeration. Note also that for 1.0 devices, not all hardware implementations enforced these limits.

For 2.0 devices, I "heard" the max allowable current draw was raised to 1A. Might be 1.1A? It seems reasonable to assume that the vast majority of USB devices actually draw less current than is maximally allowed by the relevant USB standard.

I have no idea about the 3.0 devices. And, can't help you with the XD spec's at all. Good luck to you on your project!

-mpm

There are several types. All cards 64MB and lower are 'S' type and apparently easier to interface with, but it gets more complicated with the other types. The company that makes the device I want to adapt had to reverse engineer it because Fuji refused to deal with them, apparently because they are not a camera manufacturer. Of course, they have problems with newer cards, which is the main reason I would like to convert it. All I need to simulate is type 'S'

I'm trying to get information the the device manufacturer at the moment, but don't like my chances.

I really hope I would not need to supply 500mA. I'm not looking for full USB host capability, just USB flash drives, and I doubt the small DVD players I see with USB flash compatibility are able to supply that much current. I won't need to support USB2 or 3 since the files are small and the data rate not important.

cards

other

flash

Won't a $9 adapter do it for you?

I am not wanting to connect an xD card to a computer. I want to connect a flash drive to a device (music synthesizer) that normally accepts xD cards.

The physical side of this would be easy since the card socket is on a separate PCB in the synth that is connected to the main PCB by a ribbon so all I need to do is replace that PCB with my custom one.

The Atmel AT90USB647 looks like a suitable uC, but I'm still lost on the xD side. The wiki article