Re: USB 2.0 question

[mike@xxxxxxx]

True, devices can be mixed and will operate at their maximum speed,
**provided that there isn't a slower device upstream.**
ie. If you connect a USB2.0 periperal via a USB1.1 hub it will only work
work at full speed (12Mb/s).

see
http://www.usb.org/developers/data/usb_20g.pdf
for a longer explanation.


Mike

On Wed, 27 February 2002, "Paul Gordon" wrote:

>
> From what I understand, USB 2.0 uses totally independent per-device
timing,
> so different speed USB devices can be mixed & matched on the same
bus and
> all operate at their optimum speeds.
>
> I could be wrong of course, but I'm sure I read that somewhere....
>
> Paul G.
>
>
>
> >From: "Timothy Morris" <timothy.morris@xxxxxxx>
> >Reply-To: ukha_d@xxxxxxx
> >To: <ukha_d@xxxxxxx>
> >Subject: [ukha_d] USB 2.0 question
> >Date: Wed, 27 Feb 2002 18:29:58 -0000
> >
> >My new mainboard has USB 2.0
> >
> >
> >
> >I don't have any peripherals that support it yet, but all the
friendly
> >debate has resulted in a question.
> >
> >
> >
> >Is USB2.0 the same as say U160 SCSI that if you connect one slow
(USB
> >1.0) peripheral anywhere in the chain then the entire controller
falls
> >back to USB 1.0 speeds?
> >
> >
> >
> >What about if you have USB 2.0 peripherals connected to one port,
and
> >USB 1.x connected to the other (even though the ports share the
same
> >controller)?
> >
> >
> >
> >Anyone?
> >
> >
> >
> >Tim.
> >
>
>
>
>
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--

Mike Brown
email:  mike@xxxxxxx
tel:    +44 (0)1763 260665


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