[time-nuts] Of rubidium life and piggy-bank anemia....

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Dec 1 16:41:13 EST 2007


Poul-Henning Kamp wrote:
> In message <4751D10D.5050608 at xtra.co.nz>, Bruce Griffiths writes:
>   
>> Poul-Henning Kamp wrote:
>>     
>>> In message <4751C857.6020104 at xtra.co.nz>, Bruce Griffiths writes:
>>>
>>> You guys could save a lot of time if you read my paper where all
>>> this is described in detail:
>>>
>>> 	http://phk.freebsd.dk/pubs/timecounter.pdf
>>>       
>> This paper addresses virtually none of the hardware design issues at all.
>>     
>
> That was not the main focus.
>
> The signals were indeed clocked through 3 D flipflops clocked on the
> global clock, to handle metastability, before they latched the count
> latches.
>
> I probably still have the VHDL somewhere...
>
>   
The point is that actually using latches in this way is considered poor
design practice when crossing clock domains.

Bruce



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