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liwenrui
Observer
Observer
7,642 Views
Registered: ‎06-24-2011

Input clock jitter

When wei use the clock wizard, there is a field "jitter" for the input clock,   my question is how I get that input clock jitter value? 

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3 Replies
wuher
Explorer
Explorer
7,639 Views
Registered: ‎07-24-2011

You should look in your clock device (crystal, oscillator, pll) datasheet.

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gszakacs
Professor
Professor
7,630 Views
Registered: ‎08-14-2007

The clocking wizard wants to know the peak-to-peak cycle jitter.  Most oscillators

will publish RMS jitter, but you might have to dig to find the peak number.  Also

the default units for the jitter in the clocking wizard is UI or unit intervals.  Most oscillator

jitter is specified in ps or ns, so you're better off changing the units to match the oscillator data.

 

-- Gabor

-- Gabor
liwenrui
Observer
Observer
7,611 Views
Registered: ‎06-24-2011

That helps.  Thanks everybody.

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