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State Measurements
Model 1630A/D/G
SEQUENTIAL TRIGGERING
Sequential triggering is used to trigger the analyzer only after a certain set of events has occurred in the
sequence specified . It is used in defining a path of a branching network within the programming of the target
system .
For example, figure 4-27 is a typical branch network . The analyzer is to execute a trace at the trigger term 6000,
but only if the program has followed path 2 to reach the location 6000 . Resource terms can define the trace
specifications as : In sequence find [0300], then [0305], then [0500], then start trace on the first [00001]
occurrence of [6000] .
5000
Figure 4-27. Branching Network With Specified Paths
Each resource term arms the analyzer for the next term to be recognized . The analyzer executes the trace only
after all the terms have been recognized in the given sequence .
1 . Press TRACE and move the cursor to the [start] field.
2. Press INSERT three times to open three fields for sequential triggering . Initially, all fields begin at [a].
3. Use the NEXT[] key to specify the sequence terms of find [a], then [b], then [c], then start trace at [d] as
in figure 4-28 . Notice the find sequence term [d] may be set for multiple occurrences before the trigger
starts the trace .
When using [then] find terms, the analyzer looks for the specified state at any time after the first state
specified. The state may occur immediately after the first state or a significant time period later.
NOTE
Step 4 applies only to the 1630G .
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