ARM ARM7TDMI - Figure 5-2 ARM7 TDMI Block Diagram

Debug Interface
ARM DDI 0210C Copyright © 2001, 2004 ARM Limited. All rights reserved. 5-5
The ARM7TDMI processor has hardware extensions that ease debugging at the lowest
level. The debug extensions:
• enable you to halt program execution
• examine and modify the core internal state of the core
• view and modify the state of the memory system
• execute abort exceptions, enabling real-time monitoring of the core
• resume program execution.
5.2.3 Debug target
The major blocks of the debug target are shown in Figure 5-2.
Figure 5-2 ARM7TDMI block diagram
The ARM CPU main processor logic
This has hardware support for debug.
The EmbeddedICE-RT logic
This is a set of registers and comparators used to generate debug
exceptions such as breakpoints. This unit is described in About
EmbeddedICE-RT logic on page 5-14.
The TAP controller
ARM CPU
main processor
logic
EmbeddedICE-RT
logic
TAP controller
Scan chain 2
Scan chain 0
Scan chain 1
BREAKPT
ARM7TDMI processor