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Trigger Position
Specifying State
Patterns and
Expressions
The trigger position specifies where the trigger state appears in the
trace.
center
Use "center" when you are interested in states that
occur before and after the trigger.
end
Use "end" when you are only interested in states
that occur before the trigger.
start
Use "start" when you are interested only in states
that occur after the trigger.
<number>
In addition to start, center, and end, you can type in
a number to specify the trigger position. For
example, if you specify the trigger position as "10
of 512", nine states before the trigger will be stored,
and 502 states will be stored after the trigger
(assuming nine states must match the storage
qualifiers before the trigger and 502 states must
match the storage qualifiers after the trigger).
You will sometimes notice that the trigger position is not exact. The
actual trigger position will be within +/- 1 state of the position
specified if counting states or time; if the count qualifier is turned off,
the actual trigger position will be within +/- 3 states of the number
specified.
Any time the cursor is in a state qualifier field, entering a Enter will
cause the patterns and expressions screen to appear (see figure 2-2).
In the patterns and expressions screen, you assign values to the range
and pattern resources and you combine these resources to create the
pattern expression.
Values
When assigning values to the range and pattern resources, you can use
symbols (in the address field only) or numeric constants in several
Using the Analyzer 2-7
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