Once Eye Finder is running at an acceptable rate you will be able to evaluate the data valid window positions and sizes. Below is a typical display:

Several things can be inferred from inspection of the Eye Finder results:

You will often see two complete data valid windows, one on each side of the analyzer clock. This is because the DDR transfers are occurring fast enough that two transfer cycles occur in the sample position adjustment range of the analyzer.

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Agilent Technologies FS2331 user manual