AN1775

5 Debug management

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5

Debug management

The Host/Target interface is the hardware equipment that connects the Host to the application

board. This interface is made of three components: a hardware debug tool, such as Micro-ICE

from ARM, a JTAG connector and a cable connecting the host to the debug tool.

Figure 8 shows the connection of the host to the STR71x board.

Figure 8.

Host to board connection

5.1

ICE debug tool

ICE Debug tool is a host interface that connects a PC to an STR71x development board

featuring a debug interface as shown in Figure 8. The Embedded ICE is an intelligent host

interface that provides fast access to host services, access to on-chip emulation and debug

facilities. When you are using the ST7R71x board as stand-alone system, the ICE Debug tool

can be used to download programs.

The STR71x development kit supports the ARM RealView ICE Micro Edition. The Micro-ICE is

plugged in to the host via a USB cable.

5.2

JTAG / ICE connector

The ICE connector enables JTAG hardware debugging equipment, such as RealView-ICE, to

be connected to the ST7R71x board. It is possible to both drive and sense the system-reset

line, and to drive JTAG reset to the core from the ICE connector. The Figure 9 shows the ARM

ICE connector pin-out.

The STR71x has a user debug interface. This interface contains a five-pin serial interface

conforming to JTAG, IEEE standard 1149.1-1993, “Standard Test Access Port-Scan Boundary

Architecture”. JTAG allows the ICE device to be plugged to the board and used to debug the

software running on the STR71x.

JTAG emulation allows the core to be started and stopped under control of the connected

debugger software. The user can then display and modify registers and memory contents, and

set break and watch points.

STR71x BOARD

HOST PC

ICE Debug tool

Power

Supply

ICE connector