TDSUSB2
Universal Serial Bus Measurement Package
077-0015-04
www.tektronix.com
Copyright © Tektronix. All rights reserved. Licensed software products are owned by Tektronix or its suppliers
and are protected by United States copyright laws and international treaty provisions.
Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication
supercedes that in all previously published material. Specifications and price change privileges reserved.
TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
TDSUSB2 Compliance Test Software Online Help, 077-0015-04.
Contacting Tektronix:
Tektronix, Inc.
14200 SW Karl Braun Drive or P.O. Box 500
Beaverton, OR 97077 USA
For product information, sales, service, and technical support:
• In North America, call 1-800-833-9200.
• Worldwide, visit www.tektronix.com to find contacts in your area.
Table of Contents
General Safety Summary................................................................................xi
Introduction .................................................................................................... 1
Welcome to the TDSUSB2 Universal Serial Bus Measurements Package ........................1
Online Help and Related Documentation...........................................................................2
Using Online Help..............................................................................................................2
Printing from the Online Help............................................................................................ 4
Conventions........................................................................................................................ 4
Related Documentation....................................................................................................... 5
Feedback............................................................................................................................. 6
General information ..................................................................................................... 6
Application specific information.................................................................................. 6
Getting Started................................................................................................ 7
Introduction and Product Description.................................................................................7
Compatibility......................................................................................................................8
Requirements and Restrictions ........................................................................................... 8
Accessories ......................................................................................................................... 8
Optional Accessories....................................................................................................8
Installation .................................................................................................. 11
Setting up the Instrument to Take Measurements.............................................................11
Recommended Instruments and Probes............................................................................ 11
Installing the Application..................................................................................................11
Deskewing ........................................................................................................................ 12
Deskewing the Probes and Channels..........................................................................12
Deskewing Probes and Channels on the supported Instruments................................ 12
Operating Basics........................................................................................... 19
About Basic Operations.................................................................................................... 19
Application Interface ........................................................................................................ 19
Application Interface Menu Controls ............................................................................... 19
Basic Instrument Functions ..............................................................................................20
Using Basic Oscilloscope Functions.......................................................................... 20
Minimizing and Maximizing the Application............................................................ 20
TDSUSB2 Universal Serial Bus Measurement Package
i
Table of Contents
Application Directories and File Names....................................................................21
File Name Extensions................................................................................................. 21
Returning to the Application...................................................................................... 21
Exiting the Application .............................................................................................. 22
Setting up the Software to take Measurements.................................................................22
Description of the Test Fixture................................................................................... 22
Setting Up the Device Details....................................................................................23
Setting up the Software..............................................................................................24
Setting Preferences..................................................................................................... 24
Table of Measurements and Options ................................................................................ 27
Low Speed and Full Speed Measurements................................................................. 27
High Speed Measurements.........................................................................................27
Selecting a Measurement.................................................................................................. 28
Signal Quality Check........................................................................................................ 29
Inrush Current Check........................................................................................................30
Droop Measurement ......................................................................................................... 31
Receiver Sensitivity Measurement ................................................................................... 32
Chirp Measurement...........................................................................................................33
Monotonic Property.......................................................................................................... 34
Configuring a Measurement ............................................................................................. 34
Configure Limits............................................................................................................... 35
Configuring Signal Quality Measurements ...................................................................... 35
Configuring Inrush Current Measurements ...................................................................... 36
Configuring Droop Measurements ................................................................................... 36
Configuring Receiver Sensitivity Measurements ............................................................. 37
Configuring Chirp Measurement...................................................................................... 37
Configuring Reset from High Speed Measurement..........................................................39
Configuring Resume Measurement .................................................................................. 40
Configuring Suspend Measurement.................................................................................. 41
ii
Configuring Reset from Suspend Measurement............................................................... 42
Configuring Packet Parameter Measurement ................................................................... 43
Packet Parameter Measurement........................................................................................44
Suspend Measurement...................................................................................................... 45
TDSUSB2 Universal Serial Bus Measurement Package
Table of Contents
Resume Measurement.......................................................................................................45
Reset from Suspend Measurement....................................................................................46
Reset from High Speed Measurement .............................................................................. 48
Taking Measurements................................................................................... 49
Acquiring Data.................................................................................................................. 49
Control Menu Options......................................................................................................51
Viewing Results................................................................................................................51
Eye Diagram............................................................................................................... 52
Waveform Plot........................................................................................................... 54
Report Generation............................................................................................................. 57
Generating Reports..................................................................................................... 57
Viewing Reports......................................................................................................... 58
TSV File Generator.................................................................................................... 58
TSV file format description........................................................................................ 59
CSV file format description ....................................................................................... 59
Saving and Recalling Setups.............................................................................................60
How to Save and Recall a Setup ................................................................................ 60
Saving a Setup............................................................................................................60
Recalling a Saved Setup.............................................................................................60
Recalling the Default Setup........................................................................................ 61
Recently Saved Setup.................................................................................................61
Recently Recalled Setup............................................................................................. 61
Tutorial .................................................................................................. 63
Introduction to the Tutorial............................................................................................... 63
Starting the Application.................................................................................................... 63
Recalling a .tsv File .......................................................................................................... 63
Taking a Full Speed Signal Quality Measurement...........................................................64
Taking a Low Speed Inrush Current Measurement..........................................................67
Taking a High Speed Signal Quality Measurement.......................................................... 68
Taking a Low Speed Signal Quality Measurement .......................................................... 71
Application Examples.................................................................................... 75
Full Speed Signal Quality Tests for Downstream Testing................................................ 75
Specifying the Equipment-Full Speed Signal Quality Downstream Tests.................75
TDSUSB2 Universal Serial Bus Measurement Package
iii
Table of Contents
Typical Equipment Setup-Full Speed Signal Quality Downstream Tests.................. 75
Selecting and Configuring Measurements-Full Speed Signal Quality Tests ............. 76
Configuring the Measurement.................................................................................... 77
Viewing Results-Full Speed Signal Quality Tests ..................................................... 78
Generating Reports-Full Speed Signal Quality Tests................................................. 79
Droop Test for Ports of Hub.............................................................................................80
Specifying the Equipment-Low Speed Droop Tests..................................................80
Typical Equipment Setup-Low Speed Droop Tests................................................... 80
Selecting and Configuring Measurements-Droop Tests.............................................82
Configuring the Measurement.................................................................................... 82
Viewing Results-Droop Tests .................................................................................... 82
Generating Reports-Droop Tests................................................................................ 83
Full Speed Signal Quality Tests for Upstream Testing..................................................... 84
Specifying the Equipment-Full Speed Signal Quality Tests
for Upstream Testing.................................................................................................. 84
Typical Equipment Setup-Full Speed Signal Quality Tests
for Upstream Testing.................................................................................................. 84
Selecting and Configuring Measurements-Full Speed Signal Quality Tests
for Upstream Testing.................................................................................................. 85
Configuring the Measurement.................................................................................... 86
Viewing Results-Full Speed Signal Quality Tests for Upstream Testing..................88
Generating Reports-Full Speed Signal Quality Tests for Upstream Testing.............. 89
Inrush Current Test for a Device ...................................................................................... 89
Specifying the Equipment-Full Speed Inrush Current Test .......................................89
Typical Equipment Setup-Inrush Current Test...........................................................89
Selecting and Configuring Measurements-Inrush Current Test.................................91
Configuring the Measurement.................................................................................... 91
Viewing Results-Inrush Current Test.........................................................................91
Generating Reports-Inrush Current Test....................................................................92
iv
Signal Quality Tests for High Speed Devices................................................................... 93
Specifying the Equipment-Signal Quality Tests for High Speed Devices
for Upstream Testing.................................................................................................. 93
Typical Equipment Setup-Signal Quality Tests for High Speed Devices
TDSUSB2 Universal Serial Bus Measurement Package
Table of Contents
for Upstream Testing.................................................................................................. 93
Selecting and Configuring Measurements-Signal Quality Tests for
High Speed Devices for Upstream Testing................................................................94
Configuring the Measurement.................................................................................... 95
Viewing Results-Signal Quality Tests for High Speed Devices
for Upstream Testing.................................................................................................. 95
Generating Reports-Signal Quality Tests for High Speed Devices
for Upstream Testing................................................................................................. 98
Packet Parameter Measurement........................................................................................99
Specifying the Equipment-Packet Parameter Measurement ...................................... 99
Typical Equipment Setup-Packet Parameter Measurement.......................................99
Set up the Oscilloscope for High Speed Host ............................................................ 99
Selecting and Configuring Measurement-Packet Parameter Measurement ............. 109
Configuring the Measurement.................................................................................. 110
Viewing Results-Packet Parameter Measurement.................................................... 110
Generating Reports-Packet Parameter Measurement............................................... 111
Resume Measurement.....................................................................................................113
Specifying the Equipment-Resume Measurement ................................................... 113
Typical Equipment Setup-Resume Measurement....................................................114
Selecting and Configuring Measurement-Resume...................................................115
Configuring the Measurement.................................................................................. 115
Viewing Results-Resume Measurement .................................................................. 116
Generating Reports-Resume Measurement..............................................................116
Reset from Suspend Measurement..................................................................................119
Specifying the Equipment-Reset from Suspend Measurement................................ 119
Typical Equipment Setup-Reset from Suspend Measurement................................. 119
Selecting and Configuring Measurement-Reset from Suspend Measurement.........120
Configuring the Measurement.................................................................................. 121
Viewing Results-Reset from Suspend Measurement ............................................... 121
Generating Reports-Reset from Suspend Measurement........................................... 122
Suspend Measurement.................................................................................................... 124
Specifying the Equipment-Suspend Measurement................................................... 124
Typical Equipment Setup-Suspend Measurement....................................................125
Selecting and Configuring Measurement-Suspend Measurement ...........................126
TDSUSB2 Universal Serial Bus Measurement Package
v
Table of Contents
Configuring the Measurement.................................................................................. 126
Viewing Results-Suspend Measurement..................................................................127
Generating Reports-Suspend Measurement.............................................................128
Reset from High Speed Measurement ............................................................................ 130
Specifying the Equipment-Reset from High Speed Measurement...........................130
Typical Equipment Setup-Reset from High Speed Measurement............................ 130
Selecting and Configuring Measurement-Reset from High Speed Measurement.... 131
Configuring the Measurement.................................................................................. 132
Viewing Results-Reset from High Speed Measurement.......................................... 132
Generating Reports-Reset from High Speed Measurement ..................................... 134
Chirp Measurement.........................................................................................................136
Specifying the Equipment-Chirp.............................................................................. 136
Typical Equipment Setup-Chirp............................................................................... 136
Selecting and Configuring Measurement-Chirp....................................................... 138
Configuring the Measurement.................................................................................. 139
Viewing Results-Chirp.............................................................................................139
Generating Reports-Chirp ........................................................................................ 141
R-GPIB Commands .................................................................................... 145
About the R-GPIB Program............................................................................................ 145
R-GPIB Reference Materials.......................................................................................... 145
Introduction to the R-GPIB Commands ......................................................................... 146
Guidelines to R-GPIB Programming.............................................................................. 146
Launching the Application Using R-GPIB..................................................................... 147
Variable: Value Command ............................................................................................. 148
Variable: Value TDSUSB2 Command Arguments and Queries- Application...............148
Variable: Value TDSUSB2 Command Arguments and Queries- Sequencer ................. 148
Variable: Value TDSUSB2 Command Arguments and Queries- Save/Recall............... 149
Variable: Value TDSUSB2 Command Arguments and Queries- Report Generation .... 149
Variable: Value TDSUSB2 Command Arguments and Queries- Results...................... 150
Sample Program.............................................................................................................. 154
Reference ................................................................................................163
Shortcut Keys.................................................................................................................. 163
USB2.0 Specifications.................................................................................................... 164
vi
TDSUSB2 Universal Serial Bus Measurement Package
Table of Contents
Low Speed................................................................................................................ 164
Full Speed................................................................................................................. 165
High Speed............................................................................................................... 166
Inrush Current Check ............................................................................................... 166
Droop Test................................................................................................................ 167
Error Codes and Warnings.............................................................................................. 167
Settings for the supported Instruments ........................................................................... 174
Upstream Setups for Low Speed signals..................................................................174
Upstream Setups for Full Speed signals...................................................................174
Downstream Setups for Low Speed signals............................................................. 175
Downstream Setups for Full Speed signals.............................................................. 175
Upstream Setup for High Speed signals...................................................................175
Inrush Setup..............................................................................................................175
Droop Setup..............................................................................................................176
Chirp Device EL_28, EL_29 EL_31 setup .............................................................. 176
Chirp Host EL_33, EL_34 setup.............................................................................. 176
Chirp Host EL_35 setup...........................................................................................176
Suspend Setup..........................................................................................................177
Resume Setup...........................................................................................................177
Reset from High Speed ............................................................................................177
Reset from Suspend.................................................................................................. 177
Packet Parameter...................................................................................................... 178
Parameters ................................................................................................ 179
About Application Parameters........................................................................................ 179
File Menu Parameters..................................................................................................... 179
Save and Recall Menu Parameters.................................................................................. 179
Preferences Parameters................................................................................................... 179
Measurement Menus.......................................................................................................180
Measurement Parameters................................................................................................ 180
Configure Menu..............................................................................................................181
Configure Signal Quality Measurements Parameters.....................................................181
Configure.................................................................................................................. 181
Source....................................................................................................................... 182
Configure Inrush Current Measurement Parameters ......................................................182
TDSUSB2 Universal Serial Bus Measurement Package
vii
Table of Contents
Configure.................................................................................................................. 182
Source....................................................................................................................... 182
Configure Droop Test Parameters .................................................................................. 183
Configure.................................................................................................................. 183
Source....................................................................................................................... 183
Configure Receiver Sensitivity....................................................................................... 183
Configure Suspend, Reset from High Speed, Resume, Reset from Suspend .................183
Configure Packet Parameter ........................................................................................... 184
Configure Chirp.............................................................................................................. 184
Results Menus................................................................................................................. 184
Utilities Menus................................................................................................................ 185
Deskew ...........................................................................................................................185
Report Generator Menu Parameters................................................................................185
TSV File Generator Menu Parameters............................................................................ 186
Help Menu ...................................................................................................................... 186
Control Menu..................................................................................................................186
Table 1. Control parameters..................................................................................... 186
Measurement Algorithms............................................................................ 187
About Measurement Algorithms ....................................................................................187
Cross-Over Voltage for Low Speed and Full Speed Signals.......................................... 187
Cross-Over Voltage for High-Speed Signals..................................................................189
Signal Rate......................................................................................................................190
EOP Width Calculation .................................................................................................. 191
Consecutive and Paired Jitter.......................................................................................... 192
Eye Diagram...................................................................................................................193
Eye Violation.................................................................................................................. 193
Inrush Current................................................................................................................. 194
Droop Test ...................................................................................................................... 194
Receiver Sensitivity Test ................................................................................................ 195
viii
Chirp Test for a Device................................................................................................... 195
Host Chirp Test...............................................................................................................196
Monotonic Property Test................................................................................................196
Rising Edge Rate ............................................................................................................ 197
TDSUSB2 Universal Serial Bus Measurement Package
Table of Contents
Falling Edge Rate............................................................................................................197
Packet Parameter.............................................................................................................198
Resume ........................................................................................................................... 199
Suspend...........................................................................................................................199
Reset from Suspend........................................................................................................ 200
Reset from High Speed................................................................................................... 201
Equipment Setup for Tests.............................................................................................. 202
Low Speed Downstream Signal Quality Host Equipment Setup.............................202
Low Speed Signal Quality for HUB Downstream................................................... 203
Full Speed Signal Quality HUB Downstream Setup................................................ 204
Full Speed Downstream Host Equipment Setup...................................................... 206
Full Speed Upstream Signal Quality Setup..............................................................207
High Speed Device Signal Quality Setup................................................................. 209
Chirp Test Equipment Setup....................................................................................210
Receiver Sensitivity Setup ....................................................................................... 212
Procedural steps........................................................................................................ 213
Resume Test Equipment Setup.................................................................................216
Reset from Suspend Test Equipment Setup............................................................. 217
Suspend Test Equipment Setup................................................................................218
Reset from High Speed Test Equipment Setup........................................................ 219
Packet Parameter Test Equipment Setup........................................................................ 220
Test Fixture Setup .................................................................................................... 220
Set up the Oscilloscope for High Speed Host .......................................................... 221
Glossary ................................................................................................ 231
TDSUSB2 Universal Serial Bus Measurement Package
ix
General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to
this product or any products connected to it. To avoid potential hazards, use this
product only as specified.
Only qualified personnel should perform service procedures.
While using this product, you may need to access other parts of the system. Read
the General Safety Summary in other system manuals for warnings and cautions
related to operating the system.
To Avoid Fire or Personal Injury:
Connect and Disconnect Properly: Do not connect or disconnect probes or test
leads while they are connected to a voltage source.
Observe All Terminal Ratings: To avoid fire or shock hazard, observe all
ratings and markings on the product. Consult the product manual for further
ratings information before making connections to the product.
Do Not Operate With Suspected Failures: If you suspect there is damage to
this product, have it inspected by qualified service personnel.
Symbols and Terms: The following terms and symbols may appear in the online
help.
WARNING: Warning statements identify conditions or practices that could
result in injury or loss of life.
: CAUTION: Caution statements identify conditions or practices that could
result in damage to this product or other property.
Terms on the Product: The following terms may appear on the product:
DANGER indicates an injury hazard immediately accessible as you read the
marking.
WARNING indicates an injury hazard not immediately accessible as you
read the marking.
CAUTION indicates a hazard to property including the product.
TDSUSB2 Universal Serial Bus Measurement Package
xi
General Safety Summary
Symbols on the Product: The following symbol (s) may appear in the product:
CAUTION Refer to Help
xii
TDSUSB2 Universal Serial Bus Measurement Package
Introduction
Welcome to the TDSUSB2 Universal Serial Bus Measurements Package
TDSUSB2 Universal Serial Bus Measurements Package is a Sun Java-based
application that runs on the supported instruments connected to a PC. You can
use the application software with the compliance test fixture to take the following
measurements:
Signal Quality
Inrush
Droop
Drop (supported by the test fixture only)
Receiver Sensitivity
Impedance Measurement using Time Domain Reflectometry (TDR),
supported by the application only with the test fixture
Chirp measurements
Packet Parameter
Resume
Reset from Suspend
Reset from High Speed
Suspend
TDSUSB2 Universal Serial Bus Measurement Package
1
Introduction
The application runs on the oscilloscope and displays on the lower part of the
screen. The oscilloscope application runs on the upper part of the screen.
Online Help and Related Documentation
You can access the information on how to operate the application and the
oscilloscope through the following related documents and online help.
Click Start > Programs > TekApplications > TDSUSB2 > Help to access the
Online Help.
Click Start > Programs > TekApplications > TDSUSB2 > Help (PDF
Version) to access the PDF version of the Online Help.
Using Online Help
Online help has many advantages over a printed manual because of advanced
search capabilities. Select Help on the right side of the application menu bar to
bring up the help file.
The main (opening) Help screen shows a series of book icons and three tabs
along the top menu, each of which offers a unique mode of assistance:
Tables of Contents (TOC) tab -organizes the Help into book-like sections.
Select a book icon to open a section; select any of the topics listed under the
book.
Index tab - enables you to scroll a list of alphabetical keywords. Select the
topic of interest to bring up the appropriate help page.
Search tab - allows a text-based search. Follow these steps:
1. Type the word or phrase you want to find in the search box
2. Select some matching words in the next box to narrow your search
3. Choose a topic in the lower box, and then select the Display button
To print a topic, select the Print button from the Help Topics menu bar.
Select Options from the menu bar for other commands, such as
Refresh.
Select the Back button to return to the previous help window. Use the
Hyperlink to jump from one topic to another. If the Back button is
grayed out or a jump is not available, choose the Help Topics button to
return to the originating help folder.
2
TDSUSB2 Universal Serial Bus Measurement Package
Introduction
Browse buttons (Next >> and Previous <<) allow you to move forward
and backward through topics in the order of the Table of Contents
(TOC).
Sometimes you will see the word, Note, in the topic text. This indicates
important information.
Certain aspects of the online help are unique to applications that run on
the oscilloscope.
Note: Green-underlined text indicates a jump (hyperlink) to another topic. Select
the green text to jump to the related topic. For example, select the green text to
jump to the topic on
button to return to this topic page.
You can tell when the cursor is over an active hyperlink (button, jump, or
popup), because the cursor arrow changes to a small hand.
Online Help and Related Documentation and the Back
Note: The light bulb and the word Tip in the graphic
indicates additional information to help you function faster or more efficiently.
. This graphic
TDSUSB2 Universal Serial Bus Measurement Package
3
Introduction
Printing from the Online Help
Some online help topics have color in the examples of the displayed application.
If you want to print this type of topic on a monochrome printer, some
information may not print because of certain colors. Instead, you should print the
topic from the PDF (portable document format) file that corresponds to the
Online Help. You can find the file in the Documents directory on the Optional
Applications Software on Windows-Based Oscilloscopes DVD. The figures of
application menus in the PDF file are gray scale and all of the information prints.
Conventions
Online help uses the following conventions:
Refers to the software part of the TDSUSB2 Universal Serial Bus
Measurements Package as the TDSUSB2 application or as the application
When steps require a sequence of selections using the application interface,
the ">" delimiter marks each transition between a menu and an option. For
example, one of the steps to recall a setup file would appear as File> Recall
Unit under test (UUT) refers to the USB2.0 device under test, hub under
test, host under test, and port under test
SOF refers to the Start of Frames exchanged between the host controller and
the device when the device is connected to the host and enumerated by the
test mode software
4
TDSUSB2 Universal Serial Bus Measurement Package
Related Documentation
Introduction
In addition to the Online Help, you can access other information on how to
operate the oscilloscope through the following related documents:
Instrument Information: The user manual for your oscilloscope provides
general information on how to operate the oscilloscope
Programmer Information: The online help for your oscilloscope provides
details on how to use GPIB commands to control the oscilloscope
You can also download the following files, which contain programmer
information and examples, from the Tektronix Web site.
Optional Applications Software on Windows-Based Oscilloscopes
Installation Manual
TDSUSB2 Universal Serial Bus Measurements Package Reference
TDSUSBF USB2.0 Compliance Test Fixture Instructions
For more information on USB2.0 specifications, visit www.usb.org.
Refer to the Optional Applications Software on Windows-Based Oscilloscopes
Installation Manual for the following information:
Software warranty
List of all available applications, compatible instruments, and relevant
software and firmware version numbers
Applying a new label
Installing an application
Enabling an application
Downloading updates from the Tektronix Web site
You can find a PDF (portable document format) file of this document in the
Documents directory on the Optional Applications Software on Windows-Based
Oscilloscopes DVD. The DVD booklet only contains information on installing
the application from the DVD and on how to apply a new label.
TDSUSB2 Universal Serial Bus Measurement Package
5
Introduction
Feedback
Tektronix values your feedback on our products. To help us serve you better,
please send us your suggestions, ideas, or comments about your oscilloscope.
Direct your feedback via email to
627-5695 and include the following information. Please be as specific as
possible.
General information
techsupport@tektronix.com or FAX at (503)
Instrument model number and hardware options, if any
Probes used
Your name, company, mailing address, phone number, FAX number
Please indicate if you would like to be contacted by Tektronix about your
suggestion or comments
Application specific information
Software version number
Description of the problem such that technical support can duplicate the
problem
If possible, save the oscilloscope and application setup files as .set files
6
If possible, save the waveform on which you are performing the
measurement as a .wfm file
Once you have gathered this information, you can contact technical support by
phone or through e-mail. If using e-mail, be sure to enter in the subject line
"TDSUSB2 Problem," and attach the .set and .wfm files.
To include screen shots from the oscilloscope menu bar, select File> Export
Setup> Image tab or File > Save > Screen Capture. Save the screen shot in the
default directory or you can choose a directory of your choice. If you want the
screen shots in color, select Edit> Copy setup> Images tab or select File > Save >
Screen Capture and select Options to get the Screen Capture Save Option dialog
box. Select the Color, Full Screen and the Normal option buttons. Select Copy.
Copy the picture to any Paint editor software.
You can then attach the file to your email (depending on the capabilities of your
email editor).
TDSUSB2 Universal Serial Bus Measurement Package
Getting Started
Introduction and Product Description
The TDSUSB2 Universal Serial Bus Measurements is a package that runs on the
supported instruments. The solution consists of a Java-based application and a
comprehensive test fixture. You can use the application software with the
compliance test fixture to take the following measurements:
Signal Quality
Inrush
Droop
Drop (supported by the test fixture only)
Receiver Sensitivity
Impedance Measurement using Time Domain Reflectometry (TDR),
supported by the application only with the test fixture
Chirp measurements
Packet Parameter
Resume
Reset from Suspend
Reset from High Speed
Suspend
The application performs tests that measure the test signals for USB2.0
compliance, displays eye diagrams and plots, displays the results as a summary
or as details, and generates reports in different formats.
TDSUSB2 Universal Serial Bus Measurement Package
7
Getting Started
Compatibility
For information on oscilloscope compatibility*, refer to the Optional
Applications Software on Windows-Based Oscilloscopes Installation Manual,
Tektronix part number 071-1888-XX. The manual is also available as a PDF file.
The dynamic range of the probes used for Low Speed and Full Speed testing
should be at least ± 8 volts. For High Speed testing, the dynamic range should be
± 2 volts.
*For a current list of compatible instruments, see the Software and Drivers
category in the Tektronix Web site.
Requirements and Restrictions
You must install Java Run-Time Environment V1.4.2_02 on the supported
oscilloscope.
Accessories
The application uses the Math1 channel for Low Speed and Full Speed mode of
operation. You will lose any information that you have stored in the Math1
channel.
You cannot restore the oscilloscope settings if you select File> Exit from the
application.
The application includes the following standard accessories:
Optional Application Software on Windows-Based Instruments DVD
Optional Application Software on Windows-Based Instruments Installation
Manual
TDSUSB2 Universal Serial Bus Measurements Package Reference
TDSUSBF USB2.0 Compliance Test Fixture Instructions
TDSUSBF USB2.0 Compliance Test Fixture
Optional Accessories
8
DG2040 Data Generator (for receiver sensitivity)
AWG610 Arbitrary Waveform Generator
P6248 Differential probes
TDSUSB2 Universal Serial Bus Measurement Package
Getting Started
P6245, P6243, TAP1500 Single-ended active probes
TCP202/TCP0030 Current probes
TDS8000 Instrument with 80E04 Time Domain Reflectometry sampling
module
Deskew Fixture: for supported instrument-Probe Calibration and Deskew
Fixture, Tektronix part number (067-0405-XX)
TDSUSB2 Universal Serial Bus Measurement Package
9
Getting Started
10
TDSUSB2 Universal Serial Bus Measurement Package
Installation
Setting up the Instrument to Take Measurements
To set up the oscilloscope, follow these steps:
1. You must power on the oscilloscope for twenty minutes before you can start
to take measurements.
2. You must run the compensation signal path on the oscilloscope.
3. You must make sure that the default factory setup is recalled before you
start using the application in the oscilloscope. To do so, push the recall
default setup button on the front-panel of the oscilloscope to recall the
default factory settings.
4. You should always use calibrated probes and degauss the current probes.
Recommended Instruments and Probes
For information on recommended instruments and probes, refer to the Optional
Application Software on Windows-Based Oscilloscopes Installation Manual.
Installing the Application
Refer to the Optional Applications Software on Windows-Based Instruments
Installation Manual for the following information:
Installing an application
Applying a new label
Enabling an application
Downloading updates from the Tektronix Web site
You can find a PDF (portable document format) file of this document in the
Documents directory on the Optional Applications Software on Windows-Based
Instruments CD–ROM. The CD booklet only contains information on installing
the application from the CD and on how to apply a new label.
TDSUSB2 Universal Serial Bus Measurement Package
11
Installation
Deskewing
Deskewing the Probes and Channels
To ensure accurate measurements, you must deskew the probes before you take
measurements from your unit under test. The deskew process is where the
oscilloscope adjusts the relative delay between the signals to accurately time
correlate the displayed waveforms.
The application includes an automated deskew utility that you can use to deskew
any pair of oscilloscope channels.
Note 1: It is recommended that you use the deskew fixture specified in the
accessories section to perform deskew. The deskew source can be the built-in
probe compensation signal in the oscilloscope or an external signal source.
Note 2: The oscilloscope has a deskew range of 50 ns.
Deskewing Probes and Channels on the supported Instruments
To deskew probes and channels on the supported instruments, follow these steps:
1. Connect the probes to Ch1 and Ch2 on the oscilloscope.
2. Connect the probe compensation signal to the deskew fixture. You can use
the probe compensation signal from the oscilloscope as the source for the
deskew fixture.
3. Follow the on-screen prompts for the deskew operation with an external
source.
12
TDSUSB2 Universal Serial Bus Measurement Package
Installation
The following figure shows signals before performing the deskew procedure with
a single edge:
Figure 1: Signals before deskew
4. To start the application from a supported oscilloscope, select File> Run
Application> USB2.0 Test Package or Analyze>USB2.0 Test Package from
the menu bar of the oscilloscope.
5. Select Utilities> Deskew.
6. Set the channel Source in the From area to Ch1. The Source waveform is the
reference point to which the remaining channels are deskewed.
7. Set the channel Source in the To area to Ch2, to deskew the channel.
8. Select the Reference Level for Ch1 and set the reference value. The
reference level is the percentage level of the waveform from which to take
the edges to deskew.
9. Select the Reference Level in the To area for Ch2 and set the reference
value.
10. Select the Hysteresis in the From area for Ch1. Hysteresis helps to ignore
the noise level in the waveform.
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Installation
11. Select the Hysteresis in the To area for Ch2 and set the hysteresis value.
12. Select the Slope, Rise or Fall, on which to perform the deskew operation.
13. Select the number of edges used for deskew.
14. To start the deskew utility, select Utilities> Perform Deskew and confirm
the operation.
15. Without changing the From: Ch1 channel, deskew the remaining channels.
The following figure shows the results after performing the deskew operation
with a single edge. The reference level is set to 50% for Ch1 and Ch2, the
hysteresis is set to 5%, the number of edges is set to 1, and the slope is set to the
rising edge.
Note: The probe compensation signals vary from 0.8 to 1 volt (for all supported
TDS instruments) and from 0.35 to 1 volt (for all supported DPO instruments)
rather than swinging from 0 to 1 volt in a traditional oscilloscope. Set the
Reference level and the Hysteresis level appropriately so that the Ref level is at
the middle of the swing on the signal.
Figure 2: Signals after deskew
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TDSUSB2 Universal Serial Bus Measurement Package
Installation
To perform the deskew operation with an external source, follow these steps:
1. Connect the probes to Ch1 and Ch2 on the oscilloscope.
2. Connect an external source to the deskew fixture.
3. Follow the instructions of the Probe Calibration and Deskew fixture
(Tektronix part number: 067-0405-xx) to make the connections.
4. Set up the oscilloscope as follows:
Use the Horizontal Scale knob to set the oscilloscope to an acquisition
rate so that there are two or more samples on the deskew edge.
Use the Vertical Scale and Position knobs to adjust the signals to fill
the display without missing any part of the signals.
Set the Record Length so that there are more samples for the edges in
the acquisition. It is recommended that you set the record length to
25000 points.
5. To start the application from a supported oscilloscope, select File> Run
Application> USB2.0 Test Package or Analyze> USB2.0 Test Package from
the menu bar of the oscilloscope.
6. Select Utilities> Deskew.
7. Set the channel Source in the From area to Ch1. The remaining channels are
deskewed to the Source waveform, which is the reference point.
8. Set the channel Source in the To area to Ch2, the channel to be deskewed.
9. Select the Reference Level for Ch1. The reference level is the percentage
level of the waveform from which to take the edges to deskew.
10. Select the Reference Level in the To area for Ch2 and set the reference
value.
11. Select the Hysteresis in the From area for Ch1. Hysteresis helps to ignore
the noise level in the waveform.
12. Select the Hysteresis in the To area for Ch2 and set the hysteresis value.
13. Select the Slope, Rise or Fall, on which to perform the deskew operation.
14. Select the number of edges used for deskew.
15. To start the deskew utility, select Utilities> Perform Deskew and confirm
the operation.
16. Without changing the From: Ch1 channel, deskew the remaining channels.
17. The setup is an acquisition of a square signal at 100 KHz, with the Record
length set to 25000 points to achieve the sample resolution of 1.6 ns.
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Installation
The following figure shows an example of a deskew setup:
Figure 3: Example of deskew setup
18. Set the Reference levels for Ch1 and Ch2 in the application to 50%, the
hysteresis to 10%, the number of edges to 4, and the type to rising edge. The
following figure shows the display after performing the deskew for the
multiple edge:
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TDSUSB2 Universal Serial Bus Measurement Package
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