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Chapter 4: Connecting the Emulator to a Target System
Installing Emulator Features
Once the emulator is transparently running in the target system, it is time to start
adding other emulator features. Dividing the installation of features into two tasks
is the easiest way to debug problems. The monitor is the facility that provides the
majority of the emulator's features, but some features like the reset circuitry do not
require the monitor. The first feature to be installed does not depend on the
monitor.
Evaluating the reset facilities
Now is a good time to use the emulator to find out how the emulator reset interacts
with your target system. The first question to answer is whether or not the
emulator reset command is adequate to reset your target system. Perform the
following steps:
1 Run your target program by following the procedure in the previous steps.
2 Reset the emulation processor and run your program using the emulator
commands:
r rst
Note that the r rst command pulses the processor reset line.
3 Verify correct operation.
If your program does not run correctly after performing the above procedure, your
target system has other circuitry besides the processor that must be reset. The
emulator only resets the emulation processor when it responds to a reset command.
Other circuitry on your target system does not get reset. The following sequence
determines if an additional reset circuit is required.
1 Run your target program following the procedure in the previous steps.
Installing Emulator Features
75
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