as i know, when you bulk out a package as USBHOST.
you send out a "out token", then the data, and peripheral will return an "ACK", or "NACK", or "STALL" etc...
all the progress is finished in several us, it is a continuous progress, one after another immediately.
so, what'a meaning of this timeout register?
btw: I found if I set a wrong number with this register, then I will never recv NACK interrupt.
