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To capture a trace of activity both preceding and following the write_hdwr symbol
in the update_sys module, place update_sys.write_hdwr in the entry buffer and
choose Trace→About(), or on the commad line, enter:
trace about long_aligned update_sys.write_hdwr
To specify a trigger and set the trigger position
• Place the trigger specification desired (such as address 1000h) in the entry buffer,
and then choose Trace→After(), Trace→Before(), or Trace→About().
• When displaying memory in mnemonic format, position the mouse pointer over the
program line that you wish to use as the trigger, press and hold the select mouse
button, and choose Trace After, Trace Before, or Trace About from the pop-up
menu.
• Using the command line, select trace after, trace before, or trace about to set the
trigger position.
Normally the analyzer begins to save processor activity whenever the trace is
started. By selecting trigger position, you can specify which portion of processor
activity you will view in the trace list.
The trace after command causes the analyzer to fill its trace memory with
processor activity that occurred after the trigger event.
The trace before command causes the analyzer to fill its trace memory with
processor activity that occurred before the trigger event.
The trace about command causes the analyzer to fill its trace memory with
processor activity that occurred before and after the trigger event. With this
command, the trigger event is positioned at the center of the trace.
The actual trigger position in the trace list is within +/-3 states of the position
specified.
Chapter 7: Using the Emulation-Bus Analyzer
Making Simple Trace Measurements
183
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