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Subject: Re: Using JB while in USB mode?

Re: Using JB while in USB mode?

From: Andrew Jamieson <>
Date: Mon, 23 Sep 2002 19:22:17 +1000

OK, I sorta tried this with an ISD300 proto board I have at work:

1) Plug in ISD300 attached HDD to USB2 port on computer, let it enumerate,
blah, blah, blah
2) Start data transfer to/from HDD (tried both reads and writes). Large
data chucks (>100MB) were used to give me some time to mess around.
3) Sometime during the transfer, dis-assert the ATA_ENABLE pin on the
ISD300. Wait for the transfer progress meter to pause (using windows ... )
4) Turn the HDD off, wait 20 seconds, turn HDD on again.
5) Immediately on power-on (whilst the HDD is still POST'ing), re-apply
6) The data transfer continues with no problem

This worked with both a single large file (a big .zip) and multiple smaller
files. Although it does not necessarily prove that a second controller can
perform another transfer during the ISD300 disable period, it suggests to me
that it's worth a look.

Of course, this is all useless for the ISD200 enabled players ....


----- Original Message -----
From: "Andrew Jamieson" <>
To: <>
Sent: Sunday, September 22, 2002 7:45 AM
Subject: Re: Using JB while in USB mode?

> Hmmm ...... True. However, might it be possilbe to suspend the USB disk
> activity when required by the firmware? This is not an option on the
> ISD200, as the ATA_EN pin resets the internal logic, but on the ISD300 it
> only suspends the ATA state machine (USB is not reset). Whether this will
> work or not depends on robust that suspend is, and if it will recover if
> suspended in the middle of a transfer ..... I must admit, I can't see it
> being happy about resuming with different data in the HDD buffer, but who
> knows??
> A
> ----- Original Message -----
> From: "Linus Nielsen Feltzing" <>
> To: <>
> Sent: Sunday, September 22, 2002 6:13 AM
> Subject: Re: Using JB while in USB mode?
> > On Sat, 21 Sep 2002 21:35:52 +0200, Itai wrote:
> > > I was just wondering - is it possible to use the JB (browse, play
> > > music etc.) while a USB cable is connected??
> >
> > Technically yes, but it won't be able to communicate with the PC at
> > the same time.
> >
> > --
> > Linus Nielsen Feltzing, on 2002-09-21
> >
> >
Received on 2002-09-23

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