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Troubleshooting the Logic Analyzer
Analyzer Problems
Unwanted triggers
Unwanted triggers can be caused by instructions that were fetched but
not executed.
❏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. Suppose you are analyzing a pipelined processor having
fetch, decode, execute, and memory stages. The processor fetches 32-
bit words. To ensure that the processor has begun executing a
particular routine when the trigger occurs, set the trigger to the
module entry address plus 08 hex. (This assumes that there is no
immediate data in the instruction stream.)
No activity on activity indicators
❏Ensure that the Threshold settings in the Format menu match the logic
family being probed.
❏Check for loose cables, board connections, and analysis probe connections.
❏Check for bent or damaged pins on the analysis probe.