[time-nuts] TAC/TDC

Javier Serrano javier.serrano.pareja at gmail.com
Thu Dec 16 00:14:09 UTC 2010


On Wed, Dec 15, 2010 at 10:49 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> ...
>>
>> http://www.ohwr.org/projects/fmc-tdc/wiki
>>
>
>
> Hmm. How do you intend to discriminate short pulses? It needs to be done in
> a way that it does not significantly impairs on the timing measurement.
>

The TDC chip will give the FPGA a measurement but it will be ignored, i.e.
not stored in the circular buffer. This would mean the FPGA would need to
get its own copy of the input pulses to check for width violations. At the
precisions we are considering we could probably use a standard fanout chip.


>
> Time-stamping wrap-around requirement is not in the spec. Essentially a
> requirement on the length of the time-stamping counter.
>
>
Thanks, I made that 64 bits.


> You mix requirements and sketch of design-idea. Keep requirements and
> proposed design properties separate.
>

Granted. It's a very young project. We will clean up soon.

Cheers,

Javier



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