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Chapter 4:Connecting the Emulator to a Target System
Installing Emulator Features
Dealing with keep-alive circuitry by using the
custom foreground monitor
The foreground monitor will periodically service the internal 68360 watchdog
timer if it is enabled via the SIM registers, but you may have problems with other
keep-alive circuitry located in the target system. Because the foreground monitor
cycles are shown to the target system, bus cycle activity monitors should not be a
problem. Also, because interrupts can be serviced within a reasonable period of
time, any keep-alive circuits that depend on interrupts should not be a problem.
Keep-alive circuits that require a certain address to be accessed probably will fail
when you are using the foreground monitor. The keep-alive problem will most
likely show up immediately when using the foreground monitor. If the monitor is
interlocked, it will be affected immediately if a keep-alive circuit causes a bus
error. If a keep-alive circuit generates an interrupt or a reset, it should also be
immediately obvious. If reset is only temporarily asserted, it may not be so
obvious because the emulator will return to the monitor when it is released.
If you suspect a problem with a keep-alive circuit, try using the custom foreground
monitor. This monitor can be customized to take the required actions to satisfy a
keep-alive circuit. Look in the graphical interface manuals for information on
using the custom foreground monitor. Retry your reset into the monitor with the
customized foreground monitor.
If keep-alive circuits cannot be accommodated by using the available emulator
features, you may need to disable them for emulation.
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