The principle for USB ISO Synchronization
Refer to USB20, 5.12.4.2 Feedback, Ff is expressed in number of samples per (micro)frame for one channel. The Ff value consists of:
an integer part that represents the (integer) number of samples per (micro)frame and,
a fractional part that represents the “fraction” of a sample that would be needed to match the sampling frequency Fs to a resolution of 1 Hz or better.
Now we can support full-speed endpoints, the Ff value shall be encoded in an unsigned 10.10 (K=10) format which fits into three bytes. (10.14 format.)
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