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The ARM7TDMI-S 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 ARM7TDMI-S
A debug system typically has three parts:
The debug host and the protocol converter are system‑dependent.
The Debug Host:
The debug host is a computer that is running a software debugger such as the ARM Debugger for Windows (ADW). The debug host allows you to issue high‑level commands such as setting breakpoints or examining the contents of memory.
The Protocol Converter:
The protocol converter interfaces between the high-level commands issued by the debug host and the low‑level commands of the ARM7TDMI-S JTAG interface. Typically it interfaces to the host through an interface such as an enhanced parallel port.
The ARM7TDMI-S has hardware extensions that ease debugging at the lowest level. The debug extensions:
The major blocks of the ARM7TDMI-S are: