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AM3517 HUSB1+USB3320 bad fetures problem

Other Parts Discussed in Thread: AM3517

we find a big problem when use HUSB1 interface +USB3320 to work as a USB host ,

if without a extern USB  HUB ,It cann't work as a USB HOST. 

why?  and how to correct it ?

if this problem is  the AM3517's  fault ,I think TI must  let   consumer know it.