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Message
From: M. AbuKhater<perocletos@y...>
Date: Wed Jan 26 12:25:11 CET 2005
Subject: [usb] Difference between full&low speed transceiver
hello Xianshic
well first off all there is no lowspeed transceiver, when u connect a low speed device, the host (root Hub) or the hub u are connecting the device to detects a lowspeed device and deals with it as a low speed.
I guess what happened with u concerning the mouse, I think this is a different issue, check the OS may be!
>From the hardware side, the difference is that low speed has the pull-up resistor on the D- line while the Full/Highspeed has the pull-up on the D+.
many more details are distributed in the specs. u should go through it
hope that helps
Abukhater
xianshic <xianshic@y...> wrote:
Dear All,
Any one can tell me a detail difference between
full&low speed transceiver, or give a reference
documnet about this, or point out which chapter in USB
spec talk about this?
If i have a full speed transceiver in host end, can i
connect a mouse to host and work properly? Actually, I
did it and found some work, but some failed.
Thanks for your help!
xianshic
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