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Subject: Re: More hardware questions...
From: Linus Nielsen Feltzing (linus_at_haxx.se)
Date: 2004-06-15


stuart wrote:
> First off, I want to verify if I am right on this: It looks like the USB
> chip in the JukeBox 600 is using the USB power supply - while the
> JukeBox Recorder is internally powered off the RockBox batteries. Do
> you happen to know which one is better -or- perhaps, which one is the
> newer design?

As far as I know, none of those models use the USB power.

> On to some interesting connections: The IORDY (I/O Ready) and INTREQ
> (Interrupt Request) from the Hard Drive's ATA interface end up going to
> some logic and the processor - looks like pins PA3 and PA13. Hum, so
> why didn't Archos connect the IORDY line to the ISD200's IORDY input?
> Are there clues in the software as to what the processor is doing with
> these signals?

The IORDY input on the ISD200 is connected to the IORDY line on the hard
drive, for USB operation. The hard drive IORDY line also goes via a
buffer and some delay logic to the WAIT (PA3) signal on the CPU, for
waitstate generation when the CPU is controlling the hard drive.

We don't use the INTREQ signal in Rockbox.

> Why not try to get 2 compact flash cards working on the same ATA interface?

I don't know if the ISDx00 can handle more than one ATA device, but if
you load the files directly on the card, it may work.

BTW, I think you may find this page interesting:

http://rockbox.haxx.se/docs/ports.html

Linus

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