Texas Instruments TMS320C6000 DSP Manuale utente

TMS320C6000 DSP

Designing for JTAG Emulation

Reference Guide

Literature Number: SPRU641

July 2003

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Designing for JTAG EmulationSPRU641

Preface

Read This First

About This Manual

This document assists you in meeting the design requirements of the

XDS510emulator with respect to JTAG designs and discusses the XDS510

cable (manufacturing part number 2617698-0001). This cable is identified by

a label on the cable pod marked JTAG 3/5 V and supports both standard 3-volt

and 5-volt target system power inputs.

The term JTAG as used in this document refers to Texas Instruments scan-

based emulation, which is based on the IEEE 1149.1 standard.

Notational Conventions

This document uses the following conventions.

-Hexadecimal numbers are shown with the suffix h. For example, the

following number is 40 hexadecimal (decimal 64): 40h.

Related Documentation From Texas Instruments

The following documents describe the C6000devices and related support

tools. Copies of these documents are available on the Internet at www.ti.com.

Tip: Enter the literature number in the search box provided at www.ti.com.

TMS320C6000 CPU and Instruction Set Reference Guide (literature

number SPRU189) describes the TMS320C6000CPU architecture,

instruction set, pipeline, and interrupts for these digital signal processors.

TMS320C6000 Peripherals Reference Guide (literature number SPRU190)

describes the peripherals available on the TMS320C6000DSPs.

TMS320C6000 Technical Brief (literature number SPRU197) gives an

introduction to the TMS320C62xand TMS320C67xDSPs, develop-

ment tools, and third-party support.

TMS320C64x Technical Overview (SPRU395) gives an introduction to the

TMS320C64xDSP and discusses the application areas that are

enhanced by the TMS320C64x VelociTI.

Trademarks

28 Designing for JTAG Emulation SPRU641

TMS320C6000 Programmer’s Guide (literature number SPRU198)

describes ways to optimize C and assembly code for the

TMS320C6000DSPs and includes application program examples.

TMS320C6000 Code Composer Studio Tutorial (literature number

SPRU301) introduces the Code Composer Studiointegrated develop-

ment environment and software tools.

Code Composer Studio Application Programming Interface Reference

Guide (literature number SPRU321) describes the Code Composer

Studioapplication programming interface (API), which allows you to

program custom plug-ins for Code Composer.

TMS320C6x Peripheral Support Library Programmer’s Reference

(literature number SPRU273) describes the contents of the

TMS320C6000peripheral support library of functions and macros. It

lists functions and macros both by header file and alphabetically,

provides a complete description of each, and gives code examples to

show how they are used.

TMS320C6000 Chip Support Library API Reference Guide (literature

number SPRU401) describes a set of application programming interfaces

(APIs) used to configure and control the on-chip peripherals.

Trademarks

Code Composer Studio, C6000, C62x, C64x, C67x, TMS320C6000,

TMS320C62x, TMS320C64x, TMS320C67x, VelociTI, and XDS510 are

trademarks of Texas Instruments.

PALis a registered trademark of Advanced Micro Devices, Inc.

Related Documentation From Texas Instruments / Trademarks

Contents

Designing for JTAG EmulationSPRU641

Contents

1 Designing Your Target System’s Emulator Connector (14-Pin Header) 7. . . . . . . . . . . . . . . . .

2 Bus Protocol 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 IEEE 1149.1 Standard 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 JTAG Emulator Cable Pod Logic 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 JTAG Emulator Cable Pod Signal Timing 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Emulation Timing Calculations 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Connections Between the Emulator and the Target System 14. . . . . . . . . . . . . . . . . . . . . . . . . .

7.1 Buffering Signals 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.2 Using a Target-System Clock 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7.3 Configuring Multiple Processors 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Mechanical Dimensions for the 14-Pin Emulator Connector 18. . . . . . . . . . . . . . . . . . . . . . . . .

9 Emulation Design Considerations 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.1 Using Scan Path Linkers 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.2 Emulation Timing Calculations for SPL 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.3 Using Emulation Pins 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.4 Performing Diagnostic Applications 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

30 Designing for JTAG Emulation SPRU641

Figures

1 14-Pin Header Signals and Header Dimensions 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 JTAG Emulator Cable Pod Interface 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 JTAG Emulator Cable Pod Timing Diagram 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Target-System-Generated Test Clock 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Multiprocessor Connections 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Pod/Connector Dimensions 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 14-Pin Connector Dimensions 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8 Connecting a Secondary JTAG Scan Path to an SPL 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9 EMU0/1 Configuration 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

10 EMU0/1 Configuration With Additional AND Gate to Meet Timing Requirements 27. . . . . . . .

11 Suggested Timings for the EMU0 and EMU1 Signals 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

12 EMU0/1 Configuration Without Global Stop 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

13 TBC Emulation Connections for n JTAG Scan Paths 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1 14-Pin Header Signal Descriptions 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Emulator Cable Pod Timing Parameters 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Designing for JTAG EmulationSPRU641

Designing for JTAG Emulation

This document assists you in meeting the design requirements of the

XDS510emulator with respect to JTAG designs and discusses the XDS510

cable (manufacturing part number 2617698-0001). This cable is identified by

a label on the cable pod marked JTAG 3/5 V and supports both standard 3-volt

and 5-volt target system power inputs.

The term JTAG as used in this document refers to Texas Instruments scan-

based emulation, which is based on the IEEE 1149.1 standard.

1 Designing Your Target System’s Emulator Connector (14-Pin Header)

JTAG target devices support emulation through a dedicated emulation port.

This port is a superset of the IEEE 1149.1 standard and is accessed by the

emulator. To communicate with the emulator, your target system must have

a 14-pin header (two rows of seven pins) with the connections that are shown

in Figure 1. Table 1 describes the emulation signals.

Figure 1. 14-Pin Header Signals and Header Dimensions

TDO 7 8 GND

TMS 1 2 TRST

TDI 3 4 GND

TCK_RET 9 10 GND

TCK 11 12 GND

Header Dimensions:

Pin-to-pin spacing, 0.100 in. (X,Y

)

Pin width, 0.025-in. square post

Pin length, 0.235-in. nominal

PD (VCC)5 6no pin (key)†

EMU0 13 14 EMU1

†While the corresponding female position on the cable connector is plugged to prevent improper connection, the cable lead for

pin 6 is present in the cable and is grounded, as shown in the schematics and wiring diagrams in this document.

Designing Your Target System’s Emulator Connector (14-Pin Header)

Designing for JTAG Emulation

4SPRU641

Table 1. 14-Pin Header Signal Descriptions

Signal Description Emulator†

State Target†

State

TMS Test mode select O I

TDI Test data input O I

TDO Test data output I O

TCK Test clock. TCK is a 10.368-MHz clock source from the emulation cable

pod. This signal can be used to drive the system test clock OI

TRST‡Test reset O I

EMU0 Emulation pin 0 I I/O

EMU1 Emulation pin 1 I I/O

PD(VCC) Presence detect. Indicates that the emulation cable is connected and

that the target is powered up. PD should be tied to VCC in the target sys-

tem.

TCK_RET Test clock return. Test clock input to the emulator. May be a buffered or

unbuffered version of TCK. IO

GND Ground

†I = input; O = output

‡Do not use pullup resistors on TRST: it has an internal pulldown device. In a low-noise environment, TRST can be left floating.

In a high-noise environment, an additional pulldown resistor may be needed. (The size of this resistor should be based on

electrical current considerations.)

Although you can use other headers, recommended parts include:

straight header, unshrouded DuPont Connector Systems

part numbers: 65610−114

65611−114

67996−114

67997−114

Designing Your Target System’s Emulator Connector (14-Pin Header)

Designing for JTAG EmulationSPRU641

2 Bus Protocol

The IEEE 1149.1 specification covers the requirements for the test access port

(TAP) bus slave devices and provides certain rules, summarized as follows:

-The TMS/TDI inputs are sampled on the rising edge of the TCK signal of

the device.

-The TDO output is clocked from the falling edge of the TCK signal of the

device.

When these devices are daisy-chained together, the TDO of one device has

approximately a half TCK cycle setup to the next device’s TDI signal. This type

of timing scheme minimizes race conditions that would occur if both TDO and

TDI were timed from the same TCK edge. The penalty for this timing scheme

is a reduced TCK frequency.

The IEEE 1149.1 specification does not provide rules for bus master (emula-

tor) devices. Instead, it states that it expects a bus master to provide bus slave

compatible timings. The XDS510 provides timings that meet the bus slave

rules.

3 IEEE 1149.1 Standard

For more information concerning the IEEE 1149.1 standard, contact IEEE

Customer Service:

Address:

IEEE Customer Service

445 Hoes Lane, PO Box 1331

Piscataway, NJ 08855-1331

Phone:

in the US and Canada: (800) 678−IEEE

outside the US and Canada: (908) 981−1393

FAX: (908) 981−9667

Telex: 833233

Bus Protocol / IEEE 1149.1 Standard

JTAG Emulator Cable Pod Logic

Designing for JTAG Emulation

6SPRU641

4 JTAG Emulator Cable Pod Logic

Figure 2 shows a portion of the emulator cable pod. These are the functional

features of the pod:

-Signals TDO and TCK_RET can be parallel-terminated inside the pod if

required by the application. By default, these signals are not terminated.

-Signal TCK is driven with a 74LVT240 device. Because of the high-current

drive (32 mA IOL/IOH), this signal can be parallel-terminated. If TCK is tied

to TCK_RET, then you can use the parallel terminator in the pod.

-Signals TMS and TDI can be generated from the falling edge of TCK_RET,

according to the IEEE 1149.1 bus slave device timing rules.

-Signals TMS and TDI are series-terminated to reduce signal reflections.

-A 10.368-MHz test clock source is provided. You may also provide your

own test clock for greater flexibility.

Figure 2. JTAG Emulator Cable Pod Interface

100 Ω

TL7705A

RESIN

270 Ω

JP2

180 Ω

TCK_RET (Pin 9){

EMU1 (Pin 14)

EMU0 (Pin 13) 74AS1034

GND (Pins 4,6,8,10,12)

TRST (Pin 2)

TCK (Pin 11){

10.368 MHz

33 Ω

TDI (Pin 3)

TMS (Pin 1)

TDO (Pin 7)

74LVT240

180 Ω

JP1

270 Ω74F175

PD(VCC) (Pin 5)

+5 V

74AS1004

†The emulator pod uses TCK_RET as its clock source for internal synchronization. TCK is provided as an optional target system

test clock source.

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