HP 64783A, User Manual

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To define a simple trigger qualifier
•
Enter your trigger qualifier (such as, address 1000h) in the entry buffer. Then in
the menu bar, click on: 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 a 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, use the trace command to specify a trigger.
The default option for the analyzer is to begin to fill trace memory immediately
after the start of the trace. The trace completes when trace memory is full and the
trigger has been captured.
The trigger is a reference event in a trace list. You select trigger position to see
activity leading up to the trigger event, or following the trigger event, or both.
Example To trigger a trace measurement after the demo program executes the Init_system
procedure, place init_system in the entry buffer and choose Trace
→
After(), or on
the command line, enter:
trace after long_aligned init_system
The “long_aligned” option ensures that if the address of the trigger event is not on a
long word boundary, the analyzer will still be able to recognize it.
To capture a trace leading up to the address of gen_ascii_data, and then break to
the monitor when that trigger event occurs, place gen_ascii_data in the entry buffer
and choose Trace
→
Until(), or on the command line, enter:
trace before long_aligned gen_ascii_data
break_on_trigger
Chapter 5: Using the Emulation-Bus Analyzer
Making Simple Trace Measurements
206