To Qualify The Trigger State And Position - HP 64767 User Manual

Chapter 7: Using the Emulation Analyzer
Qualifying Trigger and Store Conditions

To qualify the trigger state and position

• Enter a trigger state specification in the entry buffer; then, choose Trace→After (),
Trace→About (), or Trace→Before ().
• When displaying memory in mnemonic format, position the mouse pointer over the
source line where you want to set the trace trigger, press and hold the select mouse
button and choose Trace After, Trace Before, or Trace About from the popup
menu.
• Using the command line, enter the trace after, trace about, or trace before
commands.
Tracing after the trigger state says states that occur after the trigger state should be
saved; in other words, the trigger is positioned at the top of the trace.
Tracing before the trigger state says states that occur before the trigger state should
be saved; in other words, the trigger is positioned at the bottom of the trace.
Tracing about the trigger state says states that occur before and after the trigger
state should be saved; in other words, the trigger is positioned at the center of the
trace.
When the analyzer counts time or states, the actual trigger position is within +/- 1
state of the number specified. When counts are turned OFF, the actual trigger
position is within +/- 3 states of the number specified.
Usually, when you enter a trace about command, the trigger state (line 0) is
labeled "about". However, if there are three or fewer states before the trigger, the
trigger state is labeled "after". Likewise, if there are 3 or fewer states after the
trigger, the trigger state is labeled "before".
The state you define after trace after, trace about, or trace before is the state that
will trigger the analyzer and cause states to be stored.
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