User`s guide

Interpreting views (plots)
• Total Histogram - Shows the Clock to Data measurements.
• DCD + ISI Histogram - Displays the "normalized accumulation" of all the DCD+ISI measurements
• DCD + ISI vs Span - Plots the DCD+ISI relative to the pattern
• 1-Sigma - Shows the 1-sigma values for many histograms
• FFT - Shows the spectral power density of the uncorrelated jitter frequencies from the corner
frequency specified to the Nyquist of the bit rate.
• Bathtub - Error probability density plot of a data signal.
• Summary - Shows textual summary of measurements taken.
Total Histogram View
The Total Jitter Histogram view shows the Clock to Data measurements. An arrow at the center on the
top of the plot indicates the mean of the Total Jitter Histogram. Two other histograms to the left and
right are the histograms of edge measurements from the earliest and latest measured mean edge times.
Different colored arrows at the top left and right indicate the means for each of those.
The TailFit algorithm is automatically run in this tool. The DJ reported value is determined by whichever
is larger between the mean value of the worst-case histogram and the mean of the TailFit in the data
pattern.
© WAVECREST Corporation 2005 Section 4 - GigaView
165