Epson ARM720T User Manual

The advanced debugging features of the ARM720T processor make it easier to develop 

application software, operating systems, and the hardware itself. 

The ARM720T processor forms one component of a debug system that interfaces from the 

high-level debugging that you perform to the low-level interface supported by the ARM720T 

processor. Figure 9-1 shows a typical debug system.

Figure 9-1  Typical debug system

A debug system usually has three parts:

Debug host 

A computer that is running a software debugger such as the 

ARM 

Debugger for Windows

 (ADW). The debug host enables you to issue 

high-level commands such as setting breakpoints or examining the 

contents of memory.

Protocol converter

This interfaces between the high-level commands issued by the 

debug host and the low-level commands of the ARM720T processor 

JTAG interface. Typically it interfaces to the host through an 

interface such as an enhanced parallel port.

Debug target 

The ARM720T processor has hardware extensions that ease 

debugging at the lowest level. These extensions enable you to:
•

halt program execution

•

examine and modify the internal state of the core

•

examine the state of the memory system

•

execute abort exceptions, enabling real-time monitoring of 

the core

•

resume program execution.

The debug host and the protocol converter are system-dependent.

Debug host

(host compiler

running ARM or

third party toolkit)

Protocol converter

(for example Multi-

ICE)

Debug target

(development

system containing

ARM720T

processor)