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Chapter 2: Task Guide
To select transitional timing or store qualified
Sequence level branching
In transitional timing, only 2 branches are available per sequence level.
Global counters
In transitional timing, only one global counter is available.
Storing Time Tags
Transitional timing requires time tags to recreate the data. Time tags
are either stored in the memory resources of an unused pod pair, or
they are interleaved with the data in memory. If tags are interleaved in
data, available memory depth is reduced by half.
Increasing Duration of Storage
Using the Transitional Label Select dialog to specify selected labels to
ignore can increase usable memory depth and acquisition time by
ignoring transitions on signals like clock or strobe that add little useful
information to the measurement when no other signals are
transitioning.
Invalid Data
The analyzer only looks for transitions on data lines on labels that are
turned on. Data lines on labels that are turned off store data, but only
when one of the lines that is turned on transitions. If the data line on a
label is turned on after a run, or the data line is assigned to a new label,
you would see data, but it is unlikely that every transition that occurred
was captured.
Trigger Position
In transitional timing, no data prestore (samples acquired before
trigger) is required. Therefore, much like state mode, the trigger
position (start/center/end) will indicate the percentage of memory
filled with samples after the trigger. The number of samples acquired/
displayed before trigger will vary between measurements.
To select the timing mode
1. Open the logic analyzer Setup window.