Re: DLT_ request

[Scott Deandrea <sdeandrea () apple com>]

Yes, you can think of the lower bits the frame number and the upper bits the number of overflows.

There isn’t any reason to interpret it as anything other than a 64-bit integer nor to specify the division.

—scott

> On Jan 5, 2017, at 10:35 PM, Guy Harris <guy () alum mit edu> wrote:
>
> On Jan 5, 2017, at 10:11 PM, Scott Deandrea <sdeandrea () 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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