User`s guide

Databus Tool
Overview
With the SIA-3000™ Signal Integrity Analyzer and GigaView Databus software, single-ended and
differential clock and data signals can be characterized for timing, clock and data jitter, clock-to-data
skew, channel-to-channel skew, and Bit Error Rate (BER) on up to ten channels in parallel. The analysis is
done using one reference clock and up to nine data channels. Users can input the setup and hold
specifications and they are illustrated on the graphical user interface. Setup and Hold violations can be
measured based on the actual mean of the data histogram referenced to the clock edge.
For each data lane there are two histograms: one showing the transitions before the clock edge and one
showing the transitions after the clock edge. The setup and hold specification is shown as a shaded gray
area on the screen. The tool also shows statistical long term BER in the form of a bathtub curve. This
view is used to determine long-term system reliability. The gray area is a user selected eye closure
specification. If the jitter is too high the bathtub curve will overlap the gray area and the tool will indicate
a failure.
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