Using Multiple Trigger Levels; Figure 3-15. Using Multiple Trigger Levels - HP 64700 series User Manual

Using Multiple
Trigger Levels
3-44 Examples
It is possible for the analyzer to trigger when finding a state in any
sequence level but the last because the trigger point is not actually
when the analyzer finds the state specified in the "Trigger on"
field; rather the trigger point is the first entry of the sequence level
following the level containing the "Trigger on" field.
To illustrate this point, select:
Analysis, Trace, Modify
Modify the trace specification as shown in figure 3-15.

Figure 3-15. Using Multiple Trigger Levels

You might think that because the "Trigger on" field contains "no state"
the analyzer will never trigger. But, according to the statement above,
the analyzer will trigger because the branch from sequence level one is
to the level following the one containing "Trigger on". To verify that
this is true, select:
Analysis, Begin