[email protected] said:
> External Oscillator (the system clock clock) ,  or External Timer clock
> (limited to system clock/4) 

That sounds like they are running the external signal through a synchronizer 
and then doing all the logic on the system clock.  That would add a lot of 
high frequency jitter but work as expected at longer time scales.

It would be fun to see if you could pick up hanging-bridge type artifacts.


-- 
These are my opinions.  I hate spam.



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