http://www.cadfamily.com/a/EDA_PCB/ARM/ARM--Developer-Suite-AXD-and-armsd-Debuggers-Guide_3794.html
1.1 Debugger concepts
This section introduces some of the concepts involved in debugging program images.
1.1.1 Debugger
A debugger is software that enables you to make use of a debug agent in order to
examine and control the execution of software running on a debug target. This part of
the book covers AXD, the ARM eXtended Debugger. The second part of this book
covers armsd, the ARM Symbolic Debugger.
1.1.2 Debug target
At an early stage of product development there might be no hardware. The expected
behavior of the product is simulated by software. Even though you might run this
software on the same computer as the debugger, it is useful to think of the target as a
separate piece of hardware.
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