HP 64700 series User Manual page 129

When an emulator break occurs due to the analyzer trigger, the
analyzer will stop driving the internal signal that caused the break.
Therefore, if TRIG2 is used both to break and to drive the CMB
TRIGGER (for example), TRIGGER will go true when the trigger is
found and then will go false after the emulator breaks. However, if
TRIG1 is used to cause the break and TRIG2 is used to drive the CMB
TRIGGER, TRIGGER will stay true until the trace is halted or until the
next trace starts.
Making Coordinated Measurements 6-9