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Application Note - Auto Search Synchronization
2-44 GB1400 User Manual
If the error rate is above the Threshold, the next point toward the Data Eye
Center will be examined, and so on, until the error rate transitions to below
the Threshold. The first point below the Threshold will be the TRUE
transition point.
6. After the new transition points are re-examined and the TRUE transition
points are found, the delay will be set as follows:
For Case 1, the delay will be set to the middle of the two TRU transition
points (point C).
For Cases 2 and 3, the delay will be set to be away from the middle of the
TRUE transition points by half the data clock period (point C).
7. Eye Width Measurement
In the previous step above, if the error rate is below the threshold, the
measured eye width is the point B delay measurement minus the point A
delay measurement in Diagram 1, Case 1. STOP.
In the previous step above, if the error rate is above the threshold, the
calculated eye width for Diagram 1 Case 2 is the delay measurement at point
A minus the delay measurement at point C, times two. STOP.
In the previous step above, if the error rate is above the threshold, the
calculated eye width for Diagram 1, Case 3 is the delay measurement at point
C minus the delay measurement at point B, times two. STOP.