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Interpreting
the
In the Mixed Mode display the state listing is in the top half of the
Display
screen and the timing waveforms are in the lower half. The important
-
thing to remember is that you time correlated this display so you could
see what is happening in timing during the initialization routine.
Notice that the trigger point in both parts of the display is the same as it
was when the displays were separate. The trigger in the state listing is
at state + 0000 and the trigger of the timing waveform is the vertical
dotted line.
As you look at the Mixed Mode Display, you notice that two of the five
sequential enable pulses are missing on the timing waveforms display.
This is the problem you are looking for, but you still don't have enough
information about what might be causing these two enable lines to be
inactive. This is where a closer look with the scope may help.
Re-configure
the Analyzer
with Scope
The two missing enable signals from the Timing Waveforms display
show you where to look next. Before a pulse can be displayed, the
voltage level must meet the threshold voltage requirements. To look at
these enable lines closer, for a more detailed analysis of their voltage
levels or any possible shorts or opens, you will use the oscilloscope.
Your measurement then requires the verification of the following:
l
Signal voltage levels.
l
Any possible shorted or open conditions.
Timing/State/Scope
Measurement
Example
HP 16528/1653B
27-14
Front-Panel Reference
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