Debug
ARM DDI 0301H Copyright © 2004-2009 ARM Limited. All rights reserved. 13-2
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13.1 Debug systems
The processor forms one component of a debug system that interfaces from the high-level
debugging performed by you, to the low-level interface supported by the processor. Figure 13-1
shows a typical system.
Figure 13-1 Typical debug system
This typical system has three parts:
• The debug host
• The protocol converter
• The processor.
13.1.1 The debug host
The debug host is a computer, for example a personal computer, running a software debugger
such as RealView Debugger. The debug host enables you to issue high-level commands such as
set breakpoint at location XX, or examine the contents of memory from 0x0-0x100.
13.1.2 The protocol converter
The debug host is connected to the processor development system using an interface, for
example an RS232. The messages broadcast over this connection must be converted to the
interface signals of the processor. This function is performed by a protocol converter, for
example, RealView ICE.
13.1.3 The processor
The processor, with debug unit, is the lowest level of the system. The debug extensions enable
you to:
• stall program execution
• examine its internal state and the state of the memory system
• resume program execution.
The debug host and the protocol converter are system-dependent.
Host computer running RealView™ Debugger
Debug
host
for example, RealView™ ICE
Development system containing ARM1176JZF-S
Debug
target
Protocol
converter
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