[time-nuts] 5370 processor boards available
hmurray at megapathdsl.net
Wed Oct 8 22:16:34 UTC 2014
jks at jks.com said:
> I made a real mistake by not running the 5370's 10 MHz oven clock, that was
> available right there on a processor board pin, to a GPIO on the Beagle so
> it could be accurately counted with the built-in event counter and software
> overflow (that clock used to drive the processor clock of the old MC6800). A
> terminating resistor and level-shift are required if I remember correctly,
> so it would be slightly more effort than a "blue wire" fix.
Another option would be to connect it to the clock-in pin so the CPU runs in
lock step with a good clock.
I'm assuming there is a PLL inside the chip so the exact value of the
external clock doesn't matter as long as you are willing to patch the
software that sets up the PLL.
These are my opinions. I hate spam.
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