[time-nuts] Time stamping with a PICPET
Chris Albertson
albertson.chris at gmail.com
Mon Oct 28 03:36:17 UTC 2013
I'm pretty certain the outer that the PPS interrupt handler reads in on the
CPU chip. The counter counts nanoseconds but the lower digits are always
zero. I don't think a PCI bus is involved
On Sun, Oct 27, 2013 at 7:08 PM, Dennis Ferguson <
dennis.c.ferguson at gmail.com> wrote:
>
> ...
> > The rules for things like PCI cover that case. If you do something like
> > write to a register to clear an interrupt request, you have to follow it
> by a
> > read to that register or one close to it.
--
Chris Albertson
Redondo Beach, California
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