"An Eye Is Born" by EyeKnowHow
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Uploaded by ruckb on Jun 29, 2009
Short Movie how a data eye is generated out of a Pseudo Random Bit Sequence (PRBS) and the measurements done to do a Signal Ingetrity characterization of a physical layer interface. Whole the pictures have been generated with ADS (Agilent Advanced Design System).
There are only minor differences to the orignial version ...
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The eye pattern represents a high speed BINARY data transfer.
At the center of the eye (where eye height is measured), the data must be stable at HIGH or LOW, so it must be either at a high voltage or a low one, thus the eye height.
At the eye crossing, the data may change (00, 01, 10 or 11), You can see this by the four scope lines (00 = stable low, 01 = scope trace travelling from LOW to HIGH and so on) depending of the data transition.
ve2zzz 4 months ago
@jmsa007 The center of the pattern is the point at which the signal clock (somewhere in the background, triggering the oscilloscope which measures the signal) samples the signal. Since this is a digital signal, it must be completely high or low at the sampling point. Otherwise, the ambiguity will lead to data errors. Hence, an "open" eye means that signal is fully high or low at the sample moment. If a signal trace crosses through the eye, then the eye is partially closed, which is bad.
crobc1 10 months ago
Still cant understand what does the pattern really represents :(
jmsa007 1 year ago