William "Chops" Westfield wrote :

> Are there ANY USB1.1 devices that can't be called USB2 compliant?
> (and if so, what makes them that way?)

No USB 1.1 device can be called "USB 2.0 compliant".

But then, since part of beeing "USB2 compliant" is to be able
to hande USB 1.x devices, the questions isn't realy interesting.
The compliance is *backwards*, not *forwards*.

So the answer is that "all USB 2.0 hosts/hubs are USB 1.x
compliant"...

Now, to get back to Robert's post, *why* should a PIC support
high speed USB (480 Mb/s) at all ?? I've very hard to see a case
where the PIC even can keep up with the full speed 12 Mb/s of
data...

And note that a slow/full speed device does not slow down any
high speed devices on the same host or hub, so full speed
isn't realy any problem if 12 Mb/s if more then enough anyway.

Jan-Erik.
(Now halfways through Jan Axelson's "USB Complete"... :-) )



-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist