Segger J-Link Manuel utilisateur

A product of SEGGER Microcontroller GmbH & Co. KG

J-Link

Document RM08001-R2

Date: June 30, 2008

Reference manual for

J-Link USB Protocol

www.segger.com

2 CHAPTER

Disclaimer

Specifications written in this document are believed to be accurate, but are not guar-

anteed to be entirely free of error. The information in this manual is subject to

change for functional or performance improvements without notice. Please make sure

your manual is the latest edition. While the information herein is assumed to be

accurate, SEGGER MICROCONTROLLER GmbH & Co. KG (the manufacturer) assumes

no responsibility for any errors or omissions. The manufacturer makes and you

receive no warranties or conditions, express, implied, statutory or in any communica-

tion with you. The manufacturer specifically disclaims any implied warranty of mer-

chantability or fitness for a particular purpose.

You may not extract portions of this manual or modify the PDF file in any way without

the prior written permission of the manufacturer. The software described in this doc-

ument is furnished under a license and may only be used or copied in accordance

with the terms of such a license.

Trademarks

Names mentioned in this manual may be trademarks of their respective companies.

Brand and product names are trademarks or registered trademarks of their respec-

tive holders.

Contact address

SEGGER Microcontroller GmbH & Co. KG

In den Weiden 11

D-40721 Hilden

Germany

Tel.+49 2103-2878-0

Fax.+49 2103-2878-28

Email: support@segger.com

Internet: http://www.segger.com

Document revisions

For further information on topics or routines not yet specified, please contact us.

Revision Date By Explanation

0 080523 OO Initial version

1 080526 OO

Chapter "Background information": Added JTAG

buffer description.

Some minor changes.

2 080527 OO Some minor changes.

About this document

Assumptions

This document assumes that you already have a solid knowledge of the following:

• The software tools used for building your application (assembler, linker, C com-

piler)

• The target processor.

How to use this manual

This manual explains all the functions and macros that the product offers. It assumes

you have a working knowledge of the C language. Knowledge of assembly program-

ming is not required.

Typographic conventions for syntax

This manual uses the following typographic conventions:

Style Used for

Body Body text.

Keyword Text that you enter at the command-prompt or that appears on the

display (that is system functions, file- or pathnames).

Parameter Parameters in API functions.

Sample Sample code in program examples.

Reference Reference to chapters, sections, tables and figures or other docu-

ments.

GUIElement Buttons, dialog boxes, menu names, menu commands.

Emphasis Very important sections

Table 1.1: Typographic conventions

1 Introduction......................................................................................................................7

1.1 How to use this manual ..............................................................................8

1.2 Purpose of this document ...........................................................................8

1.3 Features of J-Link ARM ...............................................................................8

2 Licensing..........................................................................................................................9

2.1 License terms..........................................................................................10

3 Background information.................................................................................................11

3.1 JTAG scan chain values ............................................................................12

3.2 Emulator configuration .............................................................................14

3.3 JTAG data buffers ....................................................................................15

4 USB communication ......................................................................................................17

4.1 Communication protocol overview.............................................................. 18

4.2 Protocol commands..................................................................................19

4.3 Get system information functions...............................................................21

4.4 Get state information functions..................................................................27

4.5 JTAG & Hardware functions .......................................................................31

4.6 Target functions ......................................................................................45

4.7 Configuration functions............................................................................. 54

5 Glossary.........................................................................................................................57

6 Literature and references...............................................................................................61

Table of Contents

Chapter 1

Introduction

This chapter describes the purpose of this manual and the J-Link ARM emulator which

uses the J-Link USB Protocol.

8 CHAPTER 1 Introduction

1.1 How to use this manual

This manual describes the J-Link USB Protocol used in J-Link products and how it is

used.

In the course of this document the J-Link ARM is refered to as emulator.

1.2 Purpose of this document

The purpose of this document is to allow developers of open source software such as

OpenOCD to write software which uses J-Link as debug interface.

This document gives an overview about the J-Link USB communication and how it

can be used in your application. Sample communications to almost each command

description should give you an idea of the data transferred via USB between J-Link

and host.

1.3 Features of J-Link ARM

J-Link provides a feature rich list of functions to simplify the

debugging process. All important functions which are used by

the SEGGER software are useable via the USB protocol.

J-Link ARM has many features:

•USB 2.0 interface

•Any ARM7/ARM9 core supported, including thumb mode

•Automatic core recognition

•Maximum JTAG speed 12 MHz

•Download speed up to 720 Kbytes/second *

•DCC speed up to 800 Kbytes/second *

•No power supply required, powered through USB

•Auto speed recognition

•Support for adaptive clocking

•All JTAG signals can be monitored, target voltage can be mea-

sured

•Support for multiple devices

•Fully plug and play compatible

•A Standard 20-pin JTAG connector

•Optional 14-pin JTAG adapter available

•Wide target voltage range: 1.2V - 3.3V

•Optional adapter for 5V targets available

* = Measured with J-Link Rev.5, ARM7 @ 50 MHz, 12MHz JTAG speed.

Chapter 2

Licensing

This chapter gives information about the licensing terms under which this document

is published.

10 CHAPTER 2 Licensing

2.1 License terms

The information in this document may only be used when fully agreeing to the terms

mentioned in this chapter.

Please note that the SEGGER J-Link software is copyrighted and may be used with

original SEGGER J-Links and legal OEM versions only. For details, please refer to the

License terms in License.txt which comes with the J-Link software and documenta-

tion pack.

In case of doubt, please contact us: info@segger.com .

2.1.1 What you may do

You may use the information contained in this document to add support for the wide

spread SEGGER J-Link ARM emulator and OEM versions in open source software.

2.1.2 What you are not allowed to do

You are not allowed to use the information in this document to

• build J-Link clones

• build J-Link compatible emulators.

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