On Jan 5, 2017, at 10:11 PM, Scott Deandrea <sdeand...@apple.com> wrote:

> An interrupt is generated when the frame number rolls over and we use this to 
> increment the upper bits so the frame number can grow beyond 11 bits.  This 
> allows software consuming the frame number not to worry about the frame wrap 
> when scheduling isochronous I/O.

So the lower 11 bits are the frame number and the upper bits are, in effect, a 
count of frame number overflows.

Is there any reason to interpret it as anything other than a 64-bit integer, or 
to specify that division in the spec for the format?
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