[time-nuts] Questionable question about the Lucent RFTGs

Bob Camp kb8tq at n1k.org
Fri Dec 5 17:18:36 EST 2014


> On Dec 5, 2014, at 3:20 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> doug at dougronald.com said:
>> Also, yes, the 68000 latency most likely required an FPGA's real time
>> capabilities.
> The 68000 was "just" a CPU.  It didn't have the typical counter/timers (or 
> other IO gear) that are found in many modern chips targeted at the embedded 
> market.  Today, you can probably get everything you need on an Arm SOC.  
> That's ROM/Flash, RAM, counter/timer and UART.

…… remember … you also need to do a high precision TDC in there somewhere and sync it up to both the GPS and the local pps. There’s more to it than just a simple divider. There’s also multiple clock domains, something that MCU’s rarely are happy with. 


> -- 
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