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Chapter 1: Agilent Technologies 16712A 128K Sample Logic Analyzer
When Something Goes Wrong
Nothing Happens
Look for an error message in the
message bar
at the top of the window.
Common messages are "slow or missing clock" and "Waiting for trigger".
If the
Run
button briefly grayed-out (and the
Stop
or
Cancel
buttons
briefly became active), select the
Window
menu, select the logic
analyzer's slot, then choose the Waveform or Listing display.
See Also
“Slow or Missing Clock” on page 34
“Waiting for Trigger” on page 37
Suspicious Data
Intermittent Data
Errors
Check for poor connections, incorrect signal levels on the hardware,
incorrect logic levels under the logic analyzer's Config tab, or marginal
timing for signals.
Unwanted Triggers
If you are using an inverse assembler or a pipeline, triggers can be
caused by instructions that were fetched but not executed. To fix, add
the prefetch queue or pipeline depth to the trigger address.
The depth of the prefetch queue depends on the processor that you are
analyzing, and can be quite deep.
Another solution which is sometimes preferred with very deep prefetch
queues is to add writes to dummy variables to your software. Put the
instruction just before the area you want to trigger on, then trigger on
the actual write to this variable. Although the instruction is prefetched,
the analyzer can be set to only trigger when the write is executed.
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