HP MC68040 User Manual page 648

Chapter 18: Connecting the Emulator to a Target System
Plugging The Emulator Into A Target System
Unfortunately, these accessories have an electrical impact on your target system.
The specifications given for the emulator do not include the impact of these
accessories. In addition to delays, the accessories can cause problems with signal
quality. Only use these accessories as a last resort.
An optional Reset Flying Lead is provided with the emulator. It can be used to
reset the target system when the rst command is used. The signal is driven low
when the emulator is in it's reset state ("R>" prompt on screen). In addition, the
signal will pulse low when a r rst or rst -m command is issued, if the emulator is
not already in the reset state. The signal carried by the Reset Flying Lead is
intended to be used to initialize circuitry in your target system that would normally
be reset along with the processor (see below).
The example circuit shows the emulator reset signal being ANDed with a target
system reset signal to generate a new target system reset signal. This new signal
will reset the processor and other circuits on the target system when either the
emulator asserts reset, or the target system generates reset.
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