HP 64783A, User Manual

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Installing the background monitor
The emulator allows you to choose between use of a background and foreground
monitor, but the choice is really predetermined by which of the MC68040 features
you will be using.
The background monitor does not support use of the MMU, the caches, or DMA.
Therefore, the background monitor is only useful in the most simple systems, or to
provided a mechanism for testing target hardware, or to further evaluate the
integration of the emulator with your target system.
The background monitor does not show cycles to your target system. It
accomplishes this by blocking the TS and TIP signals. Therefore, the background
monitor is transparent to your target system. Even though the background monitor
does not show its cycles to the target system, the initial vector fetch cycles are
shown to the target system and interlocked with the target system strobes. Cycles
not shown to the target system are called background cycles. All other cycles are
called foreground cycles.
Resetting into the background monitor
There are three ways to initially get into the background monitor. The first of these
ways is to enter the monitor from reset. Perform the following command sequence
to enter the monitor:
1 Reset the emulator and the target system if necessary using any reset procedure
you determined to work adequately.
2 Configure the emulator by entering the following commands:
cf mon=bg
cf monkaa=none
cf cache=dis
cf mmu=dis
cf ti=en
cf wait=<en,dis>, as appropriate for the target system
Chapter 18: Connecting the Emulator to a Target System
Installing Emulator Features
637