PowerTrace Serial User´s Guide 3 9
©1989-2018 Lauterbach GmbH
7. Check
TRACE32 offers a powerful feature called Analyzer.ShowFocusEye to visualize the signal integrity of the
trace port. It opens the window with a analog view of the data eyes:
The horizontal axis reflects the time line in UI (unit intervals). The vertical axis reflects the voltage range of
the input buffer. Press SCAN to update the measurement. With the button COLOR you can change the
coloring of the graph. Rainbow scale [A] and grey scale [B] give an idea about the margin
(darkblue = stable). Black and white scaling [C] shows the real usable range (white = stable/usable,
black = unstable). The window gives you an idea about the signal integrity of your lanes. Each lane can be
displayed separately by using the up/down buttons.
Mostly, if you only see a black or red screen (maybe with stripes) then the receiver did not lock. Either there
is no trace signal or the target lane speed is not as expected.
A Rainbow style B Gray style
C Black&white style
The graph shown in the Analyzer.ShowFocusEye window is similar to a
sampling scope measurement. It reflects the trace signal seen by PowerTrace
Serial. The absolute values cannot be guaranteed, but give an suitable
impression of the signal integrity and what the tools does “see”.
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