ARMV4T datasheet(24/30 Pages) ACTEL

24 / 30 page

CoreMP7

v2.6

•

A separate UART to communicate with the

monitor program is not required.

The debugging of the target system requires the

following:

•

A PC host computer running Windows to run the

debugger software

•

An EmbeddedICE Protocol Converter, a separate

box which converts the serial interface to signals

compatible with the JTAG interface and a target

system with a JTAG interface and an ARM Debug

Architecture compliant core.

Once the system is connected, the debugger can start

communicating with the target system via the RVI-ME

(which is an EmbeddedICE Interface Converter).

The debug extensions consist of several scan chains

around the processor core, and some additional signals

that are used to control the behavior of the core for

debug purposes. The most significant of these additional

signals are as follows:

BREAKPT: This core signal enables external hardware to

halt processor execution for debug purposes. When

HIGH during an instruction fetch, the instruction is

tagged as breakpointed, and the core stops if this

instruction reaches execute.

DBGRQ: This core signal is a level-sensitive input that

causes the CPU core to enter debug state when the

current instruction has completed.

DBGACK: This core signal is an output from the CPU

core that goes HIGH when the core is in debug state so

that external devices can determine the current state of

the core.

RealView ICE uses these, and other signals, through the

debug interface of the processor core, for example by

writing to the control register of the EmbeddedICE logic.

For more details, refer to the debug interface section of

the ARM datasheet or technical reference manual for

your core.

JTAG Debug Interface

The RVI-ME ICE run control unit is supplied with a short

ribbon cable. These both terminate in a 20-way 2.54 mm

pitch IDC connector. You can use the cable to mate with

a keyed box header on the target. The pinout is shown in

Figure 16.

Figure 16 •

JTAG Interface Pinout

Vsupply

GND

VTref

nTRST

TDI

TMS

TCK

RTCK

TDO

nSRST

DBGRQ

DBGACK

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