|
Message
From: tomko81@h...
Date: Thu, 13 Nov 2003 03:07:15 +0100
Subject: [usb] sync packet in full speed mode and low speed mode
Hi everyone,
It seems K state mean differental logic'0' in full speed , logic '1' in
slow speed, also for SOP in USB, it need to change from IDLE state to K
state.
My question is that for the sync packet"00000001"(LSB at the
left hand side) after the SOP,after the NRZI, is it become "01010100" for
full speed but become " 10101011" for slow speed? so that it can satisfy
the SOP condition due to the difference of K state in two mode.
The USB spec. only give one example and it haven't mention clearly
it is full speed or low speed. Please tell me whether i am right or wrong.
Thank you very much.
TOM
|
 |
Browse
