[usb] usb bandwith

[MeiZX <meizx@ict.ac.cn>]

hi,all
  please help me to verify the three usb transfer rate 480Mb/s,12Mb/s,and 1.5Mb/s defined by usb specification.in full speed mode,one endpoint in isochronous mode can transfer 1023 bytes/ms---8Kbits/ms,8Mbits/s.that's to say,12Mb/s bandwith cannot be used up in full speed mode.is there any application that use all the 12M bandwith? 
  in high speed mode,considered the isochronous transfer,one frame includes 8 microframe.given three transactions can be transfered in each microframe,usb can deal with 24Mbytes/s,while half of its bandwith are useless.i cannot understand.

regards
　　　　　　　　　　　　　　MeiZX
　　　　　　　　　　　　　　meizx@ict.ac.cn
　　　　　　　　　　　　　　　　　2002-08-13
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