User`s guide

Interpreting Databus Views (plots)
• Data Histogram - Shows clock to data histograms. Setup and hold specifications are displayed as gray
shaded areas
•
Data Bathtubs - Displays bathtub curves for each data channel. These curves are used for viewing long-
term statistical BER.
• Clock Histogram - Displays a histogram of the reference clock signal. Identical to using the Histogram
clock analysis tool.
• Clock Bathtub - Displays bathtub curve for clock signal.
•
Summary - Displays a summary of the values measured off of each channel.
Data Histogram
Shows clock to data histograms for up to nine data channels. Setup and hold specifications are displayed
as gray shaded areas. Skew can be measured for each channel relative to the clock. The x-axis shows
time. The vertical center line on the x-axis indicates a clock period time. The y-axis displays number of
samples in a histogram. Each channel is displayed in its own row if "Plot Display|stacked” is chosen.
© WAVECREST Corporation 2005 Section 4 - GigaView
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