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Old 06-30-2010, 09:46 PM
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Default Re: Loop Sync issues

Quote:
Originally Posted by mightyduck View Post
it wouldn't hurt, [and might help], to terminate the 192s.
The 192 word in is terminated internally.

Quote:
the usual procedure would be to use hardware termination on each of them if they are receiving external clock.
Only if the clock input is unterminated internally.

Quote:
with the amount of devices you have to clock, i would not create little sub-chains within the configuration [as in using loop sync for the 192s, or even daisy chaining them with straight word clock].
Daisy chaining word clock I/O is not a good idea. Each generation would be adding another layer of PLL along with its inherent error. The last device in the chain would most likely be a getting a clock with jitter an order of magnitude or greater than the first device. I once had to run a setup like that where I had to clock 4 devices each to the previous one. The signal from the last device would not pass back to the first one without noise/dropouts likely from serial clock phase error.

At least with loop sync the I/O is paralleled except at the loop master which is providing the clock.
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