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When CMB is enabled, each emulator is required to break to background when
CMB READY goes false, and will wait for CMB READY to go true before
returning to the run state. When an enabled emulator breaks, it will drive the CMB
READY false and will hold it false until it is ready to resume running. When an
emulator is reset, it also drives CMB READY false.
EXECUTE The CMB EXECUTE line is low true. Any HP 64700 on the CMB
can drive this line. It serves as a global interrupt and is processed by both the
emulator and the analyzer. This signal causes an emulator to run from a specified
address when CMB READY returns true.
BNC Trigger Signal
The BNC trigger signal is a positive rising edge TTL level signal. The BNC trigger
line can be used to either drive or receive an analyzer trigger, or receive a break
request for the emulator.
Comparison Between CMB and BNC Triggers The CMB trigger and BNC
trigger lines have the same logical purpose: to provide a means for connecting the
internal trigger signals (trig1 and trig2) to external instruments. The CMB and
BNC trigger lines are bi-directional. Either signal may be used directly as a break
condition.
The CMB trigger is level-sensitive, while the BNC trigger is edge-sensitive. The
CMB trigger line puts out a true pulse following receipt of EXECUTE, despite the
commands used to configure it. This pulse is internally ignored.
Note that if you use the EXECUTE function, the CMB TRIGGER should not be
used to trigger external instruments, because a false trigger will be generated when
EXECUTE is activated.
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