What is an emulator?
emulator is a debug tool with two functional groups of features.
One group of features implements run control, which allows you to control
the operation of the processor. Run control actions include GO, HALT,
STEP, and Hit Breakpoints at given memory locations.
The second group of features is used to capture and record processor activity
as it is shown on the processor bus. The triggering system allows you
to specify conditions to control capturing of trace information. The trace
system records the processor bus activity in high-speed RAM.
Together, run control and bus activity recording provide you with a powerful
is the emulator better?
emulator's features reach far beyond those of a software debugger. A full-featured
source level debugger
Advanced trigger and trace
emulator is directly connected to the processor. By sending electrical
signals, the emulator can access portions of the processor that a software
debugger cannot. You can view and modify registers that are unavailable
to a software debugger. The hardware signal allows better run-time control.
Real-time processor activity
emulator records processor activity in real time. If a problem occurs
you have a history of activity to review.
During the boot process
a system's startup code needs to be debugged, a software debugger cannot
help. The software debugger relies on the target's operating system to
provide access to the system and the communication port, rendering it
useless during the boot process. The emulator provides its own communication
port and can access any part of the system, just like the processor. Only
an emulator can provide the information you need during this critical
stage of debugging.
After the target crashes
the target system crashes, the operating system usually suspends operation,
and the software debugger is inoperative. An emulator is not affected
by a system crash, and will preserve the trace information and the processor
state information, including the register values. This is vital when re-creating
the situation that caused the problem.
is trigger, and how can it help?
What is trace, and how can it help?