C2000 Series XDS510LC
JTAG Emulator
2008 DSP Development Systems
Reference
Technical
C2000 XDS510LC
JTAG Emulator
Installati on Guide
510725-0001 Rev. A
February 2008
SPECTRUM DIGITAL, INC.
120502 Exchange Drive, #440 Stafford, TX. 77477
Tel: 281.494.4500 Fax: 281.494.5310
sales@spectr umdigital.com www.spectrumdigital.com
IMPORTANT NOTICE
Spectrum Digital, Inc. reserves the right to make changes to its products or to discontinue any
product or service without notice, and advises its customers to obtain the latest version of relevant
information to verify, before placing orders, that the information being relied on is current.
Spectrum Digital, Inc. warrants performance of its products and related software to current
specifications in accordance with Spectrum Digital’s standard warranty. Testing and other quality
control techniques are utilized to the extent deemed necessary to support this warranty.
Please be aware that the products described herein are not intended for use in life-support
appliances, devices, or systems. Spectrum Digital does not warrant nor is liable for the product
described herein to be used in other than a laboratory development environment. Use in any other
environment voids the warranty.
Spectrum Digital, Inc. assumes no liability for applications assistance, customer product design,
software performance, or infringement of patents or services described herein. Nor does Spectrum
Digital warrant or represent any license, either express or implied, is granted under any patent right,
copyright, or other intellectual property right of Spectrum Digital, Inc. covering or relating to any
combination, machine, or process in which such Digital Signal Processing development products or
services might be or are used.
WARNING
This equipment is intended for use in a laboratory test environment only. It generates, uses, and can
radiate radio frequency energy and has not been tested for compliance with the limits of computing
devices pursuant to subpart J of part 15 of FCC rules, which are designed to provide reasonable
protection against radio frequency interference. Operation of this equipment in other environments
may cause interference with radio communications, in which case the user at his own expense will be
required to take whatever measures may be required to correct this interference.
TRADEMARKS
Windows 2000, and Windows XP are registered trademarks of Microsoft Corp.
Code Composer Studio is a trademark of Texas Instruments
Copyright © 2008 Spectrum Digital, Inc.
Contents
1 Introduction to the C2000 XDS510LC JTAG Emula tor . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Provides an overview of the C2000 XDS510LC emulator along with the keys features.
1.0 Overview of the C2000 XDS510LC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.1 Key Features of the C2000 XDS510LC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
1.2 Key Items on the C2000 XDS510LC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
1.3 Support for Low V oltage DSPs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 Installing the C2000 XDS510LC JT AG Emulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Lists the hardware and software you’ll need to install the C2000 XDS510LC JTAG Emulator,
and the installation procedure of the C2000 XDS510LC in your system.
2.1 What You’ll Need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Hardware checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
Software checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2
2.2 Installing the C2000 XDS510LC JTAG Emulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.2.1 C2000 XDS510LC Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
2.3 Using the Low V oltage Adapter with the C2000 XDS510LC . . . . . . . . . . . . . . . . . . . . . 2-5
2.4 C2000 XDS510LC LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
3 S pecifications For Your Target System’ s Connection t o the Emulator . . . . . . . . . . . . 3-1
Contains information about connecting your target system to the C2000 XDS510LC USB JTAG
Emulator
3.1 Designing Your Target System’s Emulator Connector (14-pin Header) . . . . . . . . . . . . 3-2
3.2 Bus Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
3.3 Emulator Cable Pod Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
3.4 Emulator Cable Pod Signal Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
3.5 Buffering Signals Between the Emulator and the Target System . . . . . . . . . . . . . . . . . 3-6
3.6 Emulation Timing Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9
3.7 Mechanical Dimensions of the C2000 XDS510LC JTAG Emulator . . . . . . . . . . . . . . 3-11
About This Manual
This document describes the module level operations of the C2000 XDS510LC JTAG
Emulator. This emulator is designed to be used with C2000 family of Digital Signal
Controllers (DSCs) designed by Texas Instruments.
The C2000 XDS510LC JTAG Emulator is a table top module that attaches to a
personal computer or laptop to allow hardware engineers and software programmers to
develop app li cat ion s with DSCs.
Notational Conventions
This document uses the following conventions.
The C2000 XDS510LC JTAG Emulator will sometimes be referred to as the
XDS510LC, JTAG Emulator, or Emul ator.
Program listings, program examples, and interactive displays are shown is a special
italic typeface. Here is a sample program listing.
equations
!rd = !strobe&rw;
Information About Cautions
This book may contain cautions.
This is an example of a caution statement.
A caution statement describes a situation that could potentially damage your software,
or hardware, or other equipment. The information in a caution is provided for your
protection. Please read each caution carefully.
Related Documents
Texas Instruments Code Composer Studio Users Guide
Revision
Table 1: Manual History
Revision History
A Initial Release
1-1
Chapt e r 1
Introduction to the C2000 XDS510LC
USB JTAG Emulator
This chapter provides you with a description of the C2000 XDS510LC
JTAG Emulator along with the key features.
Topic Page
1.0 Overview of the C2000 XDS510LC JTAG Emulator 1-2
1.1 Key Features of the C2000 XDS510LC JTAG Emulator 1-2
1.2 Key Items on the C2000 XDS510LC JTAG Emulator 1-3
1.3 Support for Low Power DSPs 1-3
Spectrum Digital, Inc
1-2 XDS510 USB JTAG Emulator Installation Guide
1.0 Overview of the C2000 XDS510LC JTAG Emulator
The C2000 XDS510LC JTAG Emulator is designed to be used with Digital Signal
Controllers (DScs) and microprocessors which operate with +3.3 or +5 volt levels on
the JTAG interface This emulator is powered from USB line. This means no power is
drawn from the target system.
The C2000 XDS510LC is designed to be compatible with the existing Texas
Instruments XDS510 emulator and operate with debuggers provided by Texas
Instruments.
1.1 Key Features of the C2000 XDS510LC JTAG Emulator
The C2000 XDS510LC JTAG Emulator has the following features:
• Supports Texas Instrument’s Digital Signal Controllers (LF24xx, F28xx) with
JTAG interface (IEEE 1149.1)
• Compatible with Texas Instrument’s XDS510 emulator.
• Advanced emulation controller provides high performance.
• Compatible with USB 1.x and USB 2.0 (full speed)
• Supports USB interface with host PC, no adapter card required.
• Supports +3.3 volt and +5 volt JTAG interfaces (+3.3V to +1.8V with Low
Voltage Adapter).
• One status LED for operational status.
• Power provided by host USB port or USB hub
• Compatible with Texas Instruments Code Composer S tudio
• Compatible with Spectrum Digital’s Flash programming utility
• Compatible with Windows 2000, and Windows XP Operating Systems
Spectrum Digital, Inc
1-3
1.2 Key Items on the C2000 XDS510LC JTAG Emulator
Figure 1-1 shows the C2000 XDS510LC. The key items identified are:
• Status LEDs
• JTAG connector
• Tail
• USB connector to the host PC or hub
1.3 Support for Low Power DSPs
The C2000 XDS510LC JTAG emulator was designed to interface to target boards with
+3.3 or +5 volt I/O levels. However many new DSCs operate at lower I/O voltage levels
(e.g. +1.8V). To support operation with the lower voltage devices Spectrum Digital has
designed the Low Voltage Adapter, part # 701208. This adapter plugs onto the
emulator’s 2x7 female connector on one side and the target’s 2 x 7 male connector on
the other. This adapter resolves the voltage differences required for correct operation.
Chapter 2 describes the operation of the Low Voltage Adapter with the C2000
XDS510LC.
Figure 1-1, KEY ITEMS ON THE C2000 XDS510LC
Tail
USB Connector
to Host/Hub
(7x2)
JTAG Connector
Status LED
Spectrum Digital, Inc
1-4 XDS510 USB JTAG Emulator Installation Guide
2-1
Chapt e r 2
Installing the C2000 XDS510LC
USB JTAG Emulator
This chapter helps you install the C2000 XDS510LC JTAG Emulator. For
use with specific software packages such as the TI’s Code Composer
Studio refer to their respective documentation.
Topic Page
2.1 What You’ll Need 2-2
Hardware checklist 2-2
Sof tware checklist 2-2
2.2 Installing the C2000 XDS510LC JTAG Emulator 2-3
2.2.1 C2000 XDS510LC JTAG Emulator Installation Checklist 2-3
2.3 Using the Low Voltage Adapter with the C2000 XDS510LC2-5
2.4 C2000 XDS510LC JTAG Emulator LED 2-7
Spectrum Digital, Inc
2-2 C2000 XDS510LC USB JTAG Emulator Installation Guide
2.1 What You’ll Need
The following checklists detail items that are shipped with the C2000 XDS510LC JTAG
emulator and additional items you’ll need to use these tools.
Hardware checklist
__ host An IBM PC/AT or 100% compatible PC or laptop with a hard-disk
system and CD-ROM disk drive with a USB port
__ memory Minimum of 32MB
__ display Color VGA or LCD
__ emulator module C2000 XDS510LC JTAG emulator
__ target system A board with a TI DSC and power suppl y
__ connector to 14-pin connector (two rows of seven pins) --- see Chapter 3 for
target system more information about this connector
Softwa re check list
__ operating system Win 2000, Win XP
__ software tools Compil er /ass emb ler/linke r for DS C
__ debugger Code Composer Studio
__ drivers Spectrum Digital drivers for TI’s Code Composer Studio (included with
C2000 XDS510LC USB emulator or available from Spectrum Digital’s
website)
Spectrum Digital, Inc
2-3
2.2 Installing the C2000 XDS510LC JTAG Emulator
This section contains the steps for installing the C2000 XDS510LC JTAG Emulator.
2.2.1 C2000 XDS510LC Installation Checklist
To install the C2000 XDS510LC JTAG emulator execute the following checklist:
❏ Turn off the power to your target board.
❏ Insert the Spectrum Digital USB Driver CD-ROM in the computers CD-ROM drive
and install the device drivers. Code Composer/Studio should be installed already.
❏ Connect the supplied USB cable to your PC or laptop. If you connect the USB
cable to a USB hub be sure the hub is connected to the PC or laptop and power
is applied to the hub.
❏ Connect the supplied USB cable to your C2000 XDS510LC emulator.
❏ Your system configuration should now look like that in Figure 2-1or Figure 2-2
After a few moments windows will detect new hardware and prompt you with “New
Hardware Found” screens. Follow the instructions on the screens and let Windows
find the USB driver files “xds2000.inf” and sdusb2em.sys” on your CD-ROM drive.
If you want to verify a successful USB driver install, right mouse on Control Panel,
then select Properties -> Hardware -> Device Manager. You should see a new class
“SD USB Based Debug Tools” and one Spectrum Digital XDS2000 USB emulator
installed.
❏ Now connect the tail of the emulator to the 2 x 7 header on your target board. Apply
power to the target board
Do not connect or disconnect the 14-pin cable while the target system is powered up
.
Target Cable Connectors:
Be very careful with the target cable connectors. connect them gently; don’t force
them into position, or you may damage the connectors.
WARNING
Spectrum Digital, Inc
2-4 C2000 XDS510LC USB JTAG Emulator Installation Guide
Figures 2-1 and 2-2 show two typical configurations in which the C2000 XDS510LC
can be used with a host PC and target board.
Esc Num Sc roll Sys
Lock Lock Req
789
456
123
Home P gUp
End PgDn
0.
Ins D el
+
-
PrtSc
*
Break
Ctrl
Shift Shift
Alt Caps
Lock
Enter
~ ! @ # $ % ^ & * ( ) _ + |
`1234567890-=\
QWE R TYU IOP
ASDFGHJKL
ZXCVBNM
{}
[]
:"
;'
<>?
,./
F1 F2
F3 F4
F5 F6
F7 F8
F9 F10
C2000 XDS510LC JTAG
USB Cable
2x7 JTAG
Connector
Target DSC
14 pin header
Emulator Pod
Plugs into USB
port on PC/Laptop
Figure 2-1, Connecting the C2000 XDS510LC To Your Target System
Plugs into USB
port on C2000 XDS510LC
Power
Supply
Spectrum Digital, Inc
2-5
2.3 Using the C2000 XDS510LC with the Low Voltage Adapter
The Low Voltage Adapter, part # 701208, is used with the C2000 XDS510LC JTAG
emulator when the I/O voltage on the target DSP is between +2.8V and +1.8V. This
adapter resolves the voltage differences required for correct operation.
Additional uses of the Low Votage Adapter are:
• Signal buffering in noisy target environments
• Emulator header metal wear protection
This adapter plugs onto the emulator’s 2x7 female connector on one side and the
target’s 2x7 male connector on the other. The figure below shows how the Low Voltage
Adapter plugs on to the target board and subsequently how the emulator attaches to
the Low Voltage Adapter.
Esc Num Sc roll Sys
Lock Lock Req
789
456
123
Home P gUp
End PgDn
0.
Ins D el
+
-
PrtSc
*
Break
Ctrl
Shift Shift
Alt Caps
Lock
Enter
~ ! @ # $ % ^ & * ( ) _ + |
`1234567890-=\
QWERTYUIOP
ASDFGHJKL
ZXCVBNM
{}
[]
:"
;'
<>?
,./
F1 F2
F3 F4
F5 F6
F7 F8
F9 F10
C2000 XDS510LC JTAG
USB Cable
2x7 JTAG
Connector
Target DSC
14 pin header
Emulator Pod
Plugs into USB port
on Hub and PC/Laptop
Figure 2-2, Connecting the C2000 XDS510LC Through a USB Hub
Plugs into USB
port on C2000 XDS510LC
USB Hub
Plugs into a USB
port on a Hu b
Power
Supply
Power
Supply
Spectrum Digital, Inc
2-6 C2000 XDS510LC USB JTAG Emulator Installation Guide
The figure below shows the system configuration using the Low Voltage Adapter with
the C2000 XDS510LC JTAG Emulator.
Target Board
DSP
Low Voltage
2x7 Female
JTAG Header
2x7 Female
JTAG Header
2x7 Male
JTAG Header
2x7 Male
JTAG Header
Adapter
Emulato r Tail
Figure 2-3, Connecting the C2000 XDS510LC to the
Low Voltage Adapter, and DSP Target Board
Esc Num Sc roll Sys
Lock Lock Req
789
456
123
Home P gUp
End PgDn
0.
Ins D el
+
-
PrtSc
*
Break
Ctrl
Shift Shift
Alt Caps
Lock
Enter
~ ! @ # $ % ^ & * ( ) _ + |
`1234567890-=\
QWE R TYU IOP
ASDFGHJKL
ZXCVBNM
{}
[]
:"
;'
<>?
,./
F1 F2
F3 F4
F5 F6
F7 F8
F9 F10
C2000 XDS510LC JTAG
USB Cable
2x7 JTAG
Connector
Target DSC
14 pin header
Emulator Pod
Plugs into USB
port on PC/Laptop
Figure 2-4, Using the Low Voltage Adapter with the C2000 XDS510LC
Plugs into USB
port on C2000 XDS510LC
Power
Supply
Low Voltage Adapter
Spectrum Digital, Inc
2-7
2.4 C2000 XDS510LC LED
The C2000 XDS510LC has one (1) red Light Emitting Diode (LED). This LED provides
the user with the status of the emulator. The meaning of the LED is described in the
table below.
Table 1: C2000 XDS510LC LEDs
LED Name Function
USB ACTIVE Indicates activity over the USB Bus
Spectrum Digital, Inc
2-8 C2000 XDS510LC USB JTAG Emulator Installation Guide
3-1
Chapt e r 3
Specifications For Your Target System’s
Connection to the Emulator
This chapter contains information about connecting your target system to
the emulator. Your target system must use a special 14-pin connector
for proper communication with the emulator.
Topic Page
3.1 Designing Your Target System’s Emulator
Connector (14-pin Header) 3-2
3.2 Bus Protocol 3-3
3.3 Emulator Cable Pod Logic 3-4
3.4 Emulator Cable Pod Signal Timing 3-5
3.5 Buff ering Signals Between the Emulator and the 3-6
Target System
3.6 Emulation Timing Calculations 3-9
3.7 Mechanical Dimensions of the C2000 XDS510LC 3-11
JTAG Emulator
Spectrum Digital, Inc
3-2 C2000 XDS510LC USB JTAG Emulator Installation Guide
3.1 Designing Your Target System’s Emulator Connector (14-pin Header)
Certain devices support emulation through a dedicated emulation port. This port is
a superset of the IEEE 1149.1 (JTAG) standard and is accessed by the emulator. To
perform emulation with the emulator, your target system must have a 14-pin header
2 rows of 7 pins) with the connections that are shown in Figure 3-1. Table 1
describes the emulation signals.
Table 1: 14-Pin Header Signal Description
Pin # Signal Description Emulator
State Target
State
1 TMS JTAG test mode select. Output Input
3 TDI JTAG test data input. Output Input
7 TDO JTAG test data output. Input Output
11 TCK JTAG test clock. TCK is a 12 -MHz clock
source from the emulation pod. This signal
can be used to drive the system test clock.
Output Input
2 TRST- JTAG test reset. Output Input
13 EMU0 Emulation pin 0. I/O I/O
14 EMU1 Emulation pin 1. I/O I/O
5 PD Presence detect. Indicates that the
emulation cable is connected and that the
target is powered up. PD should be tied to
the target processor’s I/O pins Vcc.
Input Output
9 TCK_RET JTAG test clock return. Test clock input to
the emulator. May be a buffered or unbuf-
fer ed version of TCK.
Input Output
12
34
56
78
910
11 12
13 14
TMS
TDI
PD
TDO
TCK-RET
TCK
EMU0
TRST-
GND
no pin (key)
GND
GND
GND
EMU1
Header Dim ens io ns
Pin-to-Pin spacing, 0.100 in. (X,Y)
Pin width, 0.025-in. square post
Pin length, 0.235-in. nominal
Figure 3-1, 14 Pin Header Signals and Dimensions
Spectrum Digital, Inc
3-3
Although you can use other headers, recommended parts include:
straight header, unshrouded DuPont Connector Systems
part # 67996-114
right-angle header, unshrouded DuPont Connector Systems
part # 68405-114
3.2 Bus Protocol
The IEEE 1149.1 specification covers the requirements for JTAG bus slave devices
(such as the TMS320C5x family) 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 JTAG devices are daisy-chained together, the TDO of one device has
approximately a half TCK cycle set up 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 JTAG bus master
(emulator) devices.
Spectrum Digital, Inc
3-4 C2000 XDS510LC USB JTAG Emulator Installation Guide
3.3 Emulator Cable Pod Logic
Figure 3-2 shows a portion of the emulator cable pod. These are the functional
features of the emulator pod:
__ Signals TMS and TDI are generated from the rising edge of TCK_RET.
__ Signals TMS, TDI, TCK, and TRST- are series-terminated to reduce signal
reflections.
__ A 12-MHz test clock source is provided. You may also provide your own test
clock for greater flexibility.
33Ω
TCK_RET(Pin 9 )
TDO(Pin 7)
PD(Pin 5)
EMU1(Pin 14)
EMU0(Pin 13)
GND(P in 4)
GND(Pin 6)
GND(Pin 8
GND(P in 10)
GND(Pin 12)
TMS(Pin 1)
TDI(Pin 3)
TCK(Pin 11)
TRST-(Pin 2)
EMU0-WAIT-IN-RESET
100Ω
EMU1-CNTL
33Ω
33Ω
15Ω
18
16
14
12
11
13
15
17
100Ω
LXH241
10K
2K TLC2272A
Figure 3-2, Emulator Pod Inte rface
10K
10K
EMU0-ON
+3.3V
AC Terminat ion
Spectrum Digital, Inc
3-5
3.4 Emulator Cable Pod Signal Timing
Figure 3-3 shows the signal timings for the emulator. Table 2 defines the timing
parameters for the emulator. The timing parameters are calculated from standard
data sheet parts used in the emulator and cable pod. These parameters are for
reference only. Spectrum Digital does not test or guarantee these timings.
The emulator pod uses TCK_RET as its clock source for internal synchronization.
TCK is provided as an optional target system test clock source.
Table 2: Emulator Pod Timing Parameters
No Reference Description Min Max Units
1t
TCKmin TCK _RE T perio d 50 10000 ns
2t
TCKhighmin TCK_RET high pulse duration 15 ns
3t
TCKlowmin TCK_RET low pulse duration 15 ns
4td
(XTMX) TMS/TDI valid from TCK_RET low 5 22 ns
5tsu
(XTDOmin) TDO setup time to TCK_RET high 5 ns
6thd
(XTDOmin) TDO hold time from TCK_RET high 5 ns
4
TMS TDI
1.5 V
TCK_RET
1
3
2
6
5
Figure 3-3, Emulator Pod Timings
TDO
Spectrum Digital, Inc
3-6 C2000 XDS510LC USB JTAG Emulator Installation Guide
3.5 Buffering Signals Between the Emulator and the Target System
It is extremely important to provide high-quality signals between the emulator and
the target device on the target system. If the distance between the emulation header
and the target device is greater than 6 inches, the emulation signals must be
buffered. The need for signal buffering and placement of the emulation header
can be divided into two categories:
__ No signal buffering. As shown in figure 3-4, the distance between the header
and the target device should be no more than 6 inches.
__ Buffered emulation signals. Figure 3-5 shows the distance between the
emulation header and the target device is greater than 6 inches. The target
device signals--TMS, TDI, TDO, and TCK_RET are buffered through
the same package.
TCK
TDO
TDI
TMS
TRST-
EMU1
EMU0
Target Device
4 Inches or Less
Vcc
9
11
7
3
1
2
14
13
Emulator
Header
GND
GND
GND
GND
Vcc
TCK_RET
TCK
TDO
TDI
TMS
TRST-
EMU1
EMU0
12
10
8
6
5
4
GND
Figure 3-4, No Signal Buffering
GND
PD
4.7K4.7K
TCK
TDO
TDI
TMS
TRST-
EMU1
EMU0
Target Device
Greater than 4 Inches
Vcc
9
11
7
3
1
2
14
13
Emulator
Header
GND
GND
GND
GND
Vcc
TCK_RET
TCK
TDO
TDI
TMS
TRST-
EMU1
EMU0
12
10
8
6
5
4
GND
Figure 3-5, Buffered Emulation Signals GND
PD
4.7K
4.7K >=4.7K
Spectrum Digital, Inc
3-7
__ The EMU0 and EMU1 signals must have pullups to Vcc. The pullup resistor
value should be chosen to provide a signal rise time less than 10 uS. A 4.7k
ohm resistor is suggested for most applications. EMU0-1 are I/O pins on the
target device, however, they are only inputs to the emulator. In general, these
pins are used in multiprocessor systems to provide global run/stop operations.
__ It is extremely important to provide high quality signals, especially on the
processor TCK and the emulator TCK_RET signal. In some cases, this may
require you to provide special PWB trace routing and to use termination
resistors to match the trace impedance. The emulator pod does provide
fixed series termination on the TMS, TCK, and TDI signals.
Figure 3-6 shows an application with the system test clock generated in the target
system. In this application the TCK signal is left unconnected.
There are two benefits to having the target system generate the test clock:
__ The emulator provides only a single 12-MHz test clock. If you generate your
own test clock, you can set the frequency to match your system requirements.
__ In some cases, you may have other devices in your system that require a test
clock when the emulator is not connected.
TCK
TDO
TDI
TMS
TRST-
EMU1
EMU0
Target Device
6 Inches or Less
Vcc
9
11
7
3
1
2
14
13
Emulator
Header
Vcc
TCK_RET
TCK
TDO
TDI
TMS
TRST-
EMU1
EMU0
12
10
8
6
5
4
GND
NC
System Test Clock
Figure 3-6, Target System Generated Test Clock
PD
GND
GND
GND
GND
GND
4.7K
4.7K
Spectrum Digital, Inc
3-8 C2000 XDS510LC USB JTAG Emulator Installation Guide
Figure 3-7 shows a typical multiprocessor configuration. This is a daisy chained
configuration (TDO-TDI daisy-chained), which meets the minimum requirements of
the IEEE 1149.1 specification. The emulation signals in this example are buffered to
isolate the processors from the emulator and provide adequate signal drive for the
target system. One of the benefits of a JTAG test interface is that you can generally
slow down the test clock to eliminate timing problems. Several key points to
multiprocessor support are as follows:
__ The processor TMS, TDI, TDO, and TCK should be buffered through the same
physical package to better control timing skew.
__ The input buffers for TMS, TDI, and TCK should have pullups to Vcc. This
will hold these signals at a known value when the emulator is not connected.
A pull up resistor of 4.7k ohms is suggested.
GND
GND
GND
GND
GND
GND
TCK_RET
9 TCK
11
12
10
8
6
4
TDO
TDI
TMS
TRST-
EMU1
EMU0
7
3
1
2
14
13
5
Vcc
Header
Emulator
Target #2
Target #1
TMS
TCK
TRST-
EMU0
EMU1
TDITDO
TMS
TCK
TRST-
EMU0
EMU1
TDI
TDO
Figure 3-7, Multiprocessor Connections
Vcc
PD
4.7K Suggested
for all resistors
Spectrum Digital, Inc
3-9
3.6 Emulation Timing Calculations
The following are a few examples on how to calculate the emulation timings in your
system. For actual target timing parameters, see the appropriate device data sheets.
Assumptions:
tsu(TTMS) Target TMS/TDI setup to TCK high 5 ns
th(TTMS) Target TMS/TDI hold from TCK high 5 ns
td(TTDO) Target TDO delay from TCK low 10 ns
td(bufmax) Target buffer delay maximum 7 ns
td(bufmin) Target buffer delay minimum 1 ns
t(bufskew) Target buffer skew between two devices
in the same package:
[td(bufmax) - td(bufmin)] x 0.15 .9 ns
ttckfactor Assume a 40/60 duty cycle clock 0.4
Given in Table 2:
td(XTMSmax) Emulator TMS/TDI delay from TCK_RET
high, max 22 ns
tsu(XTDOmin) TDO setup time to emulator TCK_RET
high 5 ns
There are two key timing paths to consider in the emulation design:
__ the TCK_RET/TDI(tprdtck_TMS) path, and
__ the TCK_RET/TDO(tprdtck_TDO) path.
In each case, the worst case path delay is calculated to determine the maximum
system test clock frequency.
Spectrum Digital, Inc
3-10 C2000 XDS510LC USB JTAG Emulator
Case 1: Single processor, direct connection, TMS/TDI timed from TCK_RET.
tprdtck_TMS = (td(XTMSmax) + tsu(TTMS)) * 2
= (22ns + 5ns) * 2
= 54ns (18.5 MHz)
tprdtck_TDO = [td(TTDO) + tsu(XTDOmin)] / ttckfactor
= (10ns + 5ns) / 0.4
= 37.5ns (26.6 MHz)
In this case, the TCK/TMS-TDI path is the limiting factor.
Case 2: Single/multiple processor , TMS/TDI buffered input; TCK_RET/TDO
buffered output, TMS/TDI timed from TCK_RET.
tprdtck_TMS = (td(XTMSmax) + tsu(TTMS) + 2td(bufmax)) * 2
= (22ns + 5ns + 2(7ns)) * 2
= 82ns (12.2 MHz)
tprdtck_TDO = (td(TTDO) + tsu(XTDOmin) + tbufskew) / ttckfactor
= (10ns + 5ns + 0.9 ns) / 0.4
= 39.8ns (25.1 MHz)
In this case, the TCK/TMS-TDI path is the limiting factor.
Spectrum Digital, Inc
3-11
3.7 Mechanical Dimensions of the C2000 XDS510LC JTAG Emulator
The C2000 XDS510LC JTAG Emulator consists of a 6-foot USB cable, the C2000
XDS510LC emulator pod, and a short section of cable (tail) that connects to the
target system. The overall cable length is approximately 6 feet, 10 inches. Figure 3-8
and Figure 3-9 (page 3-12) show the mechanical dimensions for the C2000
XDS510LC emulator pod and short cable. Note that the pin-to-pin spacing on the
connector is 0.100 inches in both the X and Y planes. The C2000 XDS510LC JTAG
emulator enclosure is nonconductive plastic with one recessed metal screw.
Note: All dimensions are in inches and are nominal dimensions, unless otherwise specified.
Figure 3-8, C2000 Series XDS510LC Dimensions
Spectrum Digital, Inc
3-12 C2000 XDS510LC USB JTAG Emulator
Note: All dimensions are in inches and are nominal dimensions, unless otherwise specified.
0.100
0.875
0.100
stripe
(Connector, Front view)
key, pi n #6
Cable
pins 2,4,6,8,10,12,14
pins
1,3,5,7,9,11,13
Cable
0.225
0.420 (Connector, Side View)
Figure 3-9, 14-Pin Connector Dimensions
Printed in U.S.A., February 2008
510725-0001 Rev A
