Quote:
Originally posted by Josuah:
Yeah, phase-locked-loop itself should take care of it.

But for reasons I don't yet fully understand, the eye diagram is something that shows how jitter on the signal can still affect the resulting re-clocked signal, because of limits on the reconstruction.

From this article, A second look at jitter: Calculating bit error rates , which I only skimmed, I think they're explaining how jitter can create a sampling error because the signal isn't actually the simple curved line it is usually drawn as.

In other words, getting the right value into that buffer in the first place might go wrong. A perfectly synchronized sender and receiver might sample incorrectly by chance, because of noise in the signal itself, and jitter increases that probability.
Like I said, jitter is not an issue anymore. Worry about bigger fish.