On Tue, Apr 06, 2010 at 04:04:43PM +0100, Paulo Assis wrote:
> 2010/4/6 Franz TRIERWEILER <[email protected]>:
> > Hi Paulo,
> >
> > First many thanks for your answer.
> >
> > I have doubts about using Usb1 ou Usb2 port... I asked Freescal in order to
> > make sure but according to the IMX datasheet, it is a USB 2.0 port.
What may be confusing to you is the following: To reduce consumer
confusion, the USB committee made the USB-2.0 spec such that all
existing 1.1 compliant devices would be USB-2.0 compatible without
any change. So these devices can be called USB-2.0 compliant too!
So, while USB-1.1 specifies two speeds, which the device may or may
not suspport, USB-2.0 specifies three speeds, which the device may or
may not support..... Something being USB-2.0 OFFICIALLY means you
should ask the question: "But does it support USB-high-speed?", and
when you get the answer: "No, it supports USB-FULL-speed", you have to
know that FULL speed is only 12 Mbps, and nothing close to the full
speed of USB-2.0, which is 480 Mbps.....
Confused? Good! It means you've been paying attention.
Roger.
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