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dac39j82 sysref sampling using device clock

Hi,

I have a hard time to cleanly sample the sysref using device clock to sync the jesd, I am able to delay device clock in fine steps, but have not found any methods of telling me whether the sampling is done cleanly or not (in other words, I want to find a eye delay range for the sampling).

Please enlighten me about how to tell whether the sampling of the sysref using device clock is clean or not, so that I can systematically find the perfect eye range.

Thanks a lot.