[time-nuts] LEA-6T Group buy

Azelio Boriani azelio.boriani at screen.it
Mon Mar 26 21:29:12 UTC 2012


Sorry, I meant "even if the recipient is in the EU".
Interesting the proposed use of the LEA-6T time stamping...

On Mon, Mar 26, 2012 at 11:10 PM, Dennis Ferguson <
dennis.c.ferguson at gmail.com> wrote:

>
> On 26 Mar, 2012, at 12:56 , Chris Albertson wrote:
> > On Mon, Mar 26, 2012 at 12:50 PM, Attila Kinali <attila at kinali.ch>
> wrote:
> >> Moin,
> >>
> >> I have the numbers together for the group buy of the u-Blox LEA-6T.
> >
> > I have not been able to locate a spec sheet for there.  Do you have a
> > link?   Or maybe you could say how these are improved over the M12M?
>
> Apart from other issues it may potentially provide significantly
> more accurate time for computer timekeeping via the Time Mark input,
> depending on the accuracy of measurements on that input.
>
> That is, rather than connecting the PPS output to a computer input pin
> and then trying to timestamp when the interrupts occur, one can instead
> tie an output pin from the computer to the Time Mark input and poll
> for timestamps measured by the LEA-6T, say with a programmed sequence like
>
>    <get computer clock timestamp>
>    <toggle Time Mark pin>
>    <get computer clock timestamp>
>    . . .
>    <ask LEA-6T for Time Mark timestamp>
>
> If done well that may get the time ambiguity at the computer end down from
> the > microsecond level of interrupt latency to the < 100 nanoseconds it
> should take for a PIO write to a hardware register to complete.  If the
> LEA-6T takes Time Mark timestamps with that precision then this may be a
> significant improvement.
>
> Dennis Ferguson
>
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