Tektronix RT-Eye User manual

RT-EyeR Serial Compliance and Analysis Quick Start User Manual

www.tektronix.com

071-1769-00

Copyright © Tektronix, Inc. 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.

Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(1)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013, or subparagraphs (c)(1) and (2) of the Commercial Computer Software − Restricted Rights clause at FAR 52.227-19, as applicable.

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.

RT-Eye is a registered trademark of Tektronix, Inc.

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:

H In North America, call 1-800-833-9200. H Worldwide, visit www.tektronix.com to find contacts in your area.

Warranty 9(b)

Tektronix warrants that the media on which this software product is furnished and the encoding of the programs on the media will be free from defects in materials and workmanship for a period of three (3) months from the date of shipment. If any such medium or encoding proves defective during the warranty period, Tektronix will provide a replacement in exchange for the defective medium. Except as to the media on which this software product is furnished, this software product is provided as is" without warranty of any kind, either express or implied. Tektronix does not warrant that the functions contained in this software product will meet Customer’s requirements or that the operation of the programs will be uninterrupted or error-free.

In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the expiration of the warranty period. If Tektronix is unable to provide a replacement that is free from defects in materials and workmanship within a reasonable time thereafter, Customer may terminate the license for this software product and return this software product and any associated materials for credit or refund.

THIS WARRANTY IS GIVEN BY TEKTRONIX WITH RESPECT TO THE PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR IMPLIED. TEKTRONIX AND ITS VENDORS DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. TEKTRONIX’ RESPONSIBILITY TO REPLACE DEFECTIVE MEDIA OR REFUND CUSTOMER’S PAYMENT IS THE SOLE AND EXCLUSIVE REMEDY PROVIDED TO THE CUSTOMER FOR BREACH OF THIS WARRANTY. TEKTRONIX AND ITS VENDORS WILL NOT BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER TEKTRONIX OR THE VENDOR HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.

General Safety Summary iii. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Preface v. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Getting Started

Key Features 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using Compliance Modules 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ensuring Compatibility 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Minimum Required System Configuration 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Other Requirements and Restrictions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using Accessories 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing the Application 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Connecting to the Device Under Test 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Typical Probing Configurations 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibrating the Oscilloscope and Probes 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating Basics

Starting the RT-Eye Application 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defining Preferences 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Hiding and Returning the RT-Eye Application 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Minimizing and Maximizing the RT-Eye Application 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Docking and Undocking the RT-Eye Application 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Sequencing Controls 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exiting the RT-Eye Application 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

RT-Eye Application User Interface and Menu Structure 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Locating the Application Directories 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the RT-Eye Software

Setting Up the Application 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using the Wizard 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing Plot Summaries 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing Plot Details 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using Zoom 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using Cursors 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using a Grid 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Exporting Plots to Files 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Printing Plots 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing Results 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Creating a New Report 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Generating a Report 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Printing a Report 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Saving a Report 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing or Printing a Saved Report 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing a Saved Report 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Printing a Saved Report without Viewing 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Logging Worst Case Waveforms 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using MyTest 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Saving MyTest 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running MyTest 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Selecting Measurements and Using Autoset 42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Selecting Plots 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring Plots 44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Reconfiguring Plots and Using the Bit Error Locator 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring Measurements 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents

RT-Eye Quick Start User Manual

Table of Contents

Choosing Probe Types and Measurement Sources 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Source 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Ref Levels 52. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Smart Gating 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Clock Recovery 56. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Jitter 58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Population 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

General Config 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Setting Limits 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing the Current Limits 60. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Editing the Currently Displayed Limit File 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing a Summary of the Limits 62. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Saving the Limits File 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using Limits 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Application Examples

Creating a Custom Compliance Module with Pass/Fail Limits 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Starting the RT-EyeApplication 64. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Running the Setup Wizard 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Viewing the Results 66. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Summary of Displayed Results 67. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using a Mask 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Defining a Limits Module 70. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Creating a Compliance Report 74. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using MyTest 75. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Index

RT-Eye Quick Start User Manual

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.

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

Terms in this Manual. These terms may appear in this manual:

General Safety Summary

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. These 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.

Symbols on the Product. The following symbol may appear on the product:

CAUTION

Refer to Help

RT-Eye Quick Start User Manual

iii

General Safety Summary

RT-Eye Quick Start User Manual

Preface

This manual describes how to set up and use the RT-Eye Serial Data Compliance and Analysis Application. Only basic operations, presented as task-oriented procedures, are covered. For more detailed information, such as theory, concepts, or algorithms, refer to the RT-Eye online help. For information about using specific, industry-standard modules, refer to the documentation provided with the module. See Documentation below for additional, related information.

Documentation

To read about Use these documents

Preface

Installation, enabling an application, software warranty and license agreement, 5 times free trial, downloading files from the Tektronix site, available applications and compatibility

Basic operations of the RT-Eye application

In-depth operation, user interface help, GPIB commands, and measurement algorithms

Other related documentation, such as Method of Implementation (MOI) documents and help files for specific compliance modules, Report Generator help, and so on

To access the documentation that is installed on your instrument, click Start in the taskbar and select Programs > TekApplications.

Relevant Web Sites

Read the Optional Applications Software on a WindowsBased Oscilloscope Installation Manual.

Read the RT-Eye Serial Data Compliance and Analysis Quick Start User Manual (this manual) provided in PDF format on the Optional Applications Software on a Windows-Based Oscilloscope CD.

Access the online help from the Help menu in the RT-Eye application.

Read the relevant documents, provided in PDF files, on the

Optional Applications Software on a Windows-Based Oscilloscope CD.

You may also find useful information about serial data standards on the following Web sites:

H www.Infinibandta.org

H www.pcisig.com

H www.T11.org

H www.tektronix.com/serial_data

RT-Eye Quick Start User Manual

Preface

Conventions Used in this Manual

The following icon is used throughout this manual:

Sequence

Step

The following conventions are used throughout the text of this manual:

H The terms RT-Eye application" or application" refer to the RT-Eye Serial Compliance and Analysis Application.

H The term oscilloscope" refers to any product on which this application runs.

H The term select" is a generic term that applies to the two mechanical methods of choosing an option: with a mouse or

with the Touch Screen.

H The term Compliance Module" refers to optional plug-in applications" from Tektronix used for compliance testing to

specific serial data standards.

H The term Limits Module" refers to a formatted text file used to specify user limits on mask geometry and measurement

boundary conditions for Pass/Fail testing.

H The term channel" is context dependent. It can refer to the transmit channel of the device under test or to an

oscilloscope channel.

H The term DUT" is an acronym for Device Under Test.

H User interface screen graphics are from a TDS6000 series oscilloscope; there may be minor differences in the displays

on other types of oscilloscopes.

H When steps require a sequence of selections using the application interface, the  >" delimiter marks each transition

between a menu and an option.

RT-Eye Quick Start User Manual

Getting Started

This section contains information on key features, compliance modules, compatibility issues, installation, probing configurations, and calibration.

Key Features

The RT-Eye Serial Compliance and Analysis Application is a software product that enhances the basic capabilities of some Tektronix oscilloscopes that use Microsoft Windows operating systems. The RT-Eye application is a general analysis tool that you can use to test, debug, and verify serial-data based designs.

You can use this application to do the following tasks:

H Select and configure many amplitude and timing measurements on serial data signals

H Quickly set up and take measurements using the Setup Wizard

H Select MyTest to execute a previously saved customized set of test conditions

H Conduct RT-Eye rendering and mask testing, Time Interval Error analysis, Rj/Dj (random jitter and deterministic jitter)

analysis, and display results as a Bathtub plot

Getting Started

H Display the results as eye diagram, histogram, spectrum, or bathtub curve plots

H Use the bit error locator feature to find mask failures on the waveform

H Perform Pass or Fail limits testing based on waveform masks and based on measurements that use Limits Modules

H Perform "plug-fest" level compliance tests for available compliance modules that test against a specific standard

H Save the statistical results to a file

H Save the worst case waveforms to files

H Generate reports

RT-Eye Quick Start User Manual

Getting Started

Using Compliance Modules

You can purchase separate compliance modules for the RT-Eye application, such as Infiniband, PCI Express, FB-DIMM, and SAS. These are specific tools that you can use to ensure that device designs comply with specific serial data standards. The compliance modules available to you are listed in the Modules menu.

This manual only discusses the operation of the Serial Analysis module. However, the compliance modules may include specific help files and PDF files of Methods of Implementation (MOI) that explain how to use the compliance module.

Ensuring Compatibility

For information on oscilloscope and RT-Eye application compatibility, refer to the Optional Applications Software on Windows Based Oscilloscopes Installation Manual, Tektronix part number 071-1078-xx, that shipped with your application.

RT-Eye Quick Start User Manual

Minimum Required System Configuration

To check whether you system meets the minimum required system configuration, do the following procedure:

1. Select File > Minimize to minimize the

TekScope application.

2. Select Start > Programs > TekAp-

plications > tdsRT-Eye > Readme,

note the minimum firmware version that is required, and close the Readme file.

Getting Started

3. Click TekScope.

RT-Eye Quick Start User Manual

Getting Started

4. Select Help > About TekScope0 in the oscilloscope menu bar.

5. Verify that the firmware version is the same or greater than that noted in step 2.

Other minimum requirements are:

H Windows 2000 or Windows XP

operating system

H 850 MHz Processor

H 512 MB SDRAM

RT-Eye Quick Start User Manual

Getting Started

Other Requirements and Restrictions

MATLAB

The RT-Eye installer also installs the Sun Java Run-Time Environment (JRE) and the Mathworks MATLAB Run-Time Server. The MATLAB server is dedicated to the RT-Eye application and cannot be used for other purposes.

Do not close the MATLAB Server icon in the oscilloscope task bar. The application will close the MATLAB sever when you exit the application.

Oscilloscope

A maximum sampling rate with interpolation is often necessary to ensure accurate results. Be sure to consider the following differences in sampling rates before taking measurements:

H The TDS6604 oscilloscopes sample at 20 GS/s on two channels and at 10 GS/s on four channels.

H The TDS6000B oscilloscopes sample at 20 GS/s on two and four channels.

H The TDS6000C oscilloscopes sample at 40 GS/s on two channels and 20 GS/s on four channels.

H The TDS7404 oscilloscopes sample at 20 GS/s on one channel and at 10 GS/s on two channels.

H The TDS7000B oscilloscopes sample at 20 GS/s on one channel, 10 GS/s on two channels, and 5 GS/s on four

channels.

When the Record Length of the oscilloscope is set to 4 M or less, the application can take all measurements. The RT-Eye application can take a TIE measurement on a record length up to 20 M.

Keyboard

You will need to use a keyboard to enter new names for some file save operations.

Using Accessories

There are no standard accessories for this product.

Installing the Application

For information on how to install the RT-Eye application, refer to the Optional Applications Software on Windows Based Oscilloscopes Installation Manual that shipped with your application. This manual contains the following information:

H Checking for available applications, compatible oscilloscopes, and relevant software and firmware version numbers

H Using the five-time free trials for applications

H Applying labels for a newly authorized option installation keys

H Installing application software

H Enabling applications

H Downloading updates from the Tektronix Web site

RT-Eye Quick Start User Manual

Getting Started

Connecting to the Device Under Test

You can use any compatible probes to connect between the device under test (DUT) and oscilloscope.

WARNING. To avoid electrical shock and equipment damage, refer to the General Safety Summary at the beginning of this manual and the safety summaries in your oscilloscope and probe user manuals.

Power off the device under test before you attach probes. Do not touch exposed conductors except with the properly rated probe tips. Refer to your probe manual for proper use.

To ensure that the bandwidth is adequate for rise time measurements, your probe and oscilloscope combination must have a system bandwidth greater than 1.5 times the bit rate that you are measuring. This ensures that the bandwidth is adequate for most measurements, since most of the energy in high-speed serial data signals is contained in the first and third harmonics. To ensure accurate risetime measurements, 2.5 times the bit rate (5th harmonic) is required.

Typical Probing Configurations

There are four typical probing configurations for serial data links: two for pseudo differential waveforms and two for true differential waveforms. The method that you use to set up your measurement channel(s) depends on your application and what you want to measure.

H Two TCA-to-SMA adapters (single

ended)

RT-Eye Quick Start User Manual

H One P73XX SMA differential probe

H Two P72XX single-ended or P73XX

differential probes

Getting Started

H One P73XX differential probe

NOTE. You must deskew the probes when using two channels to perform pseudo-differential measurements. Use the proper deskew fixture and procedure as described in the user manual or online help of your oscilloscope.

The RT-Eye application relies on upsampled, deskewed data from the oscilloscope to conduct math operations for differential and common mode waveform measurements. Upsampling prior to deskew is required to ensure accurate measurements.

For more information about probes, refer to Choosing the Probe Configuration in the RT-Eye Serial Compliance and Analysis Online Help.

RT-Eye Quick Start User Manual

Getting Started

Calibrating the Oscilloscope and Probes

NOTE. To ensure accurate results, calibrate the oscilloscope and probes before you run tests. Refer to your oscilloscope and probe documentation for additional information.

1. Click Utilities > Instrument Calibration to begin calibrating the oscillo-

scope for signal path compensation.

2. Click Calibrate.

3. After the SPC compensation finishes

(verify that the Status is Pass), select

Vertical > Probe Cal0.

4. Connect the probe calibration signal to

the probe.

RT-Eye Quick Start User Manual

5. Click Calibrate Probe.

Getting Started

RT-Eye Quick Start User Manual

Getting Started

RT-Eye Quick Start User Manual

Operating Basics

Starting the RT-Eye Application

1. Start the application:

H For non-B or non-C model

oscilloscopes, select File > Run Application > RT-Eye Serial Compliance and Analysis.

H For B and C model oscilloscopes,

select App > RT-Eye Serial Compliance and Analysis.

Operating Basics

The RT-Eye application displays in the lower half of the screen.

2. If the RT-Eye Welcome dialog box dis-

plays, click Cancel.

RT-Eye Quick Start User Manual

Operating Basics

Defining Preferences

You can set some preferences that will help you use the application more efficiently. To set the preferences:

1. Select File > Preferences0.

The Preferences dialog window displays.

2. Check the preferences to:

H Display a Welcome dialog window

each time that you start the application that allows you to run either MyTest or the Wizard

H Display the Autoset Summary

dialog window each time you select Autoset.

H Enable high-performance eye

rendering. When selected, only segments of the waveform surrounding the worst-case eye violations are rendered. The resulting eye typically contains 10,000 to 12,000 unit intervals (UIs) for statistical validity but results in faster display of the eye diagrams. If this selection is not checked, then all the UIs in the record are rendered, resulting in increased fidelity of the eye diagram, but reduced measurement throughput.

3. Click:

H Apply to apply your selections

and leave the dialog window open

H Cancel to discard your changes

and close the dialog window

H OK to accept your changes and

close the dialog window

RT-Eye Quick Start User Manual

Hiding and Returning the RT-Eye Application

Operating Basics

1. Click the Hide icon to minimize the

RT-Eye application and maximize the oscilloscope display.

2. To display the RT-Eye application

again:

H For non-B or non-C model

oscilloscopes, click the App button.

H For B and C model oscilloscopes,

select App > Restore Application.

RT-Eye Quick Start User Manual

Operating Basics

Minimizing and Maximizing the RT-Eye Application

1. To minimize the application, select File > Minimize.

2. To maximize the application, click the RT-Eye icon in the task bar.

If you expanded the TekScope application full screen after minimizing the RT-Eye application, you can maximize the RT-Eye application by performing the following step:

3. To maximize the RT-Eye application again:

H For non-B or non-C model

oscilloscopes, click the App button.

H For B and C model oscilloscopes,

select App > Restore Application.

RT-Eye Quick Start User Manual

Docking and Undocking the RT-Eye Application

1. To undock the RT-Eye application, se-

lect File > Undock.

2. Click and drag the RT-Eye title bar to

position the application anywhere on screen or on a second monitor, if used.

Operating Basics

3. To dock the RT-Eye application, select

File > Dock.

RT-Eye Quick Start User Manual

Operating Basics

Using the Sequencing Controls

Sequencing is the steps to acquire waveform information, determine if the information is usable for the measurement, take the measurement, and display the results. (Before starting sequencing, you must set up the application properly.)

There are three sequencing modes:

H Single RunProcesses a single waveform, and then halts. If the waveform source is a live channel, a new waveform

is acquired using the current trigger settings of the oscilloscope

H Single No AcqProcesses a single waveform, and then halts. If the waveform source is a live channel, the

measurements are performed on the currently displayed waveform without retriggering

H Free RunContinuously acquires waveforms and sequences until you select the Stop command button; results and

any plots are updated one or more times per measurement cycle

The sequencing controls consist of the following:

1. Clear ResultsClears previously taken measurements.

2. ModeSelects one of three modes: Single Run, Single No Acq, or Free Run.

3. StartBegins the sequencing steps.

4. StopStops the sequencing.

For example, if you selected Free Run as the mode, you can click Stop to end the sequencing. If you selected Single Run or Single No Acq, it is not necessary to click Stop.

RT-Eye Quick Start User Manual

Exiting the RT-Eye Application

1. Select File > Exit or click the Close

icon.

The Exit RT-Eye dialog box opens.

Operating Basics

2. Check Save MyTest if you want to

save your last test configuration so that it can be recalled the next time you open the RT-Eye application.

3. Click:

H Yes to exit the RT-Eye application

and restore your oscilloscope settings to their state prior to starting RT-Eye.

H No to exit without restoring the

oscilloscope settings.

H Cancel to return to the RT-Eye

application.

RT-Eye Quick Start User Manual

Operating Basics

RT-Eye Application User Interface and Menu Structure

RT-Eye Quick Start User Manual

Locating the Application Directories

During installation, the RT-Eye application sets up directories for various functions, such as to save setup files, masks, and waveforms.

The default directory structure is shown.

Operating Basics

RT-Eye Quick Start User Manual

Operating Basics

RT-Eye Quick Start User Manual

Using the RT-Eye Software

Setting Up the Application

You must set up the RT-Eye application for serial data analysis. The general steps that you do are shown in the diagram.

After taking measurements, you can do the following tasks:

H View the results as statistics

H Save statistics to a .csv file

H View results as a plot

H Use the zoom function to examine

details of a plot

H Use the Cursor functions in a plot

H Save a plot file

Using the RT−Eye Software

H Print a plot

H Save the worst-case waveforms as

.wfm files

H Generate a report file

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Using the Wizard

This version of the RT-Eye Application has a Setup Wizard to enable you to quickly set up and take some key measurements. Before starting the Wizard, you must have your probe(s) connected to an applicable signal. In these procedures, a

2.5 Gb/s, 127 bit, PRBS repeating pattern signal is used. The positive and negative outputs of the signal are connected via

phase-matched SMA cables to a Tektronix P7380SMA differential probe, which is connected to CH 1 of the oscilloscope. (See page 6, Connecting to the Device Under Test.)

To use the wizard, perform the following steps:

1. Start the application:

H For older oscilloscopes (typically non-B

models), select File > Run Application > RT-Eye Serial Compliance and Analysis.

H For newer oscilloscopes (typically B

models), select App > RT-Eye Serial Compliance and Analysis.

2. If the RT-Eye Welcome dialog box dis- plays, click Run Wizard. Go to step 4.

3. If the RT-Eye Welcome dialog box does not display, select Measurements > Wizard0.

(You can use the File > Preferences menu selection to set the RT-Eye Welcome dialog box to open when you start the application.)

RT-Eye Quick Start User Manual

The Setup Wizard dialog window opens with step 1, Probe Type, highlighted. The selections for step 1 appear in the right hand area of the window.

4. Select Probe Type from the drop-down

list (in this procedure, Differential), and click Next.

Using the RT−Eye Software

The choice that you made for step 1 is displayed in yellow text.

5. Repeat the above procedure for each

step, making the selections that you want.

After making your selections for step 7, Plots, the display should look similar to this.

6. Click Run.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

A display similar to this with the plot summary window in the upper half of the screen appears.

Viewing Plot Summaries

The RT-Eye Plot Summary window has the following toolbar controls for controlling the plot views.

1. Click this icon to display the plot summary in the lower half of the screen.

RT-Eye Quick Start User Manual

2. Click this icon to return the plot sum-

mary to the upper half of the screen.

3. Click this icon to display the plot sum-

mary full screen.

Using the RT−Eye Software

4. Click one of these icons to display the

plot summary at half screen again.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Viewing Plot Details

To view details of a plot, click the details icon associated with one of the four possible plots. For example, to display details of the upper left plot:

1. Click this icon.

H The RT-Eye Plot Details window

displays for the selected plot.

H The toolbar controls change.

Using Zoom

The toolbar for the Plot Details window has four icons that control the zoom function.

1. Click this icon to select the zoom-in tool.

2. Click an area of the waveform to zoom in by a factor of two, centered around the point that you clicked.

Note: An alternative zoom function is to click and drag a box around the area that you want to zoom; the selected area is expanded to fill the display area.

RT-Eye Quick Start User Manual

3. Click a portion of the zoomed wave-

form to further zoom in (or click and drag a box around the area).

4. Click this icon to select the zoom out

tool.

5. Click the waveform to zoom out.

If you zoomed in more than once on the waveform, clicking the waveform will zoom out in equal steps.

Using the RT−Eye Software

6. Click this icon to select the zoom hori-

zontal axis tool.

7. Click an area of the waveform to zoom

the horizontal axis by a factor of two (centered around the area clicked), but retain the scale of the vertical axis.

Note: An alternative zoom function is to click and drag a box around the area that you want to zoom; the selected area is expanded to fill the display area, but still maintain the vertical scale.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

8. Click a portion of the zoomed waveform to further zoom in (or click and drag a box around the area).

9. Click the horizontal zoom icon to turn off the zoom function.

10. Click the 100% icon to return the wa-

veform to its original size.

Clicking this icon always returns the waveform directly to its original size without any intermediate zoom steps.

Using Cursors

Use plot cursors to quickly take accurate measurements of two cursor positions on a waveform and the difference (∆) value between the cursors. Note that cursors are on by default when viewing plot details.

Make sure that all zoom functions are off before using cursors.

1. Click and drag each cursor to position it where you want.

2. Read the V1, V2, and ∆V values for the horizontal cursors and the t1, t2, and ∆t values for the vertical cursors.

Cursor icons

3. To reset the cursors,click this icon.

Resetting the cursors is a quick method of locating cursors that may be positioned outside of the display.

4. To turn cursors off, click the associated icon (horizontal and/or vertical).

RT-Eye Quick Start User Manual

5. To return to the plot summary window,

click this icon.

The plot summary window displays.

Using a Grid

1. Click this icon to display the details of

the upper right plot (in this example, the TIE Jitter Spectrum plot).

Using the RT−Eye Software

2. To display a grid on the plot, click this

icon.

3. To turn the grid off, click the grid icon.

You cannot display a grid on an eye diagram plot.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Exporting Plots to Files

You can export your plot data to two types of files:

H Graphic files in any format available on

the Save as type drop-down list

H Data files in binary .fig file format

1. Set up the plot window as you want to export it.

Graphic Data

2. Click the Graphics or Data icon to select the type file that you want to export.

3. Browse to the directory in which you want to save the file.

4. Enter a file name.

5. Select the type of file format that you

want to export.

6. Click Save.

RT-Eye Quick Start User Manual

Printing Plots

You can print your plots to a printer if you have configured Microsoft Windows on your oscilloscope for a printer. To print a plot, perform the following steps:

1. Set up the plot window as you want it

to print (zoom, cursors, and so on).

2. Click the print figure icon.

Using the RT−Eye Software

3. To print the plot as it appears, click

Print0.

The Print dialog box for your printer opens.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

4. To print the plot, choose the printer settings that you want, and click OK.

Viewing Results

You can view the statistics for your measurements in two ways:

H Summary view shows the current data

for all the measurements that you selected.

H Detail view shows the following

statistics for each measurement: population, mean, standard deviation, maximum, minimum, and peak-to-peak.

1. To view the summary statistics for your current measurements, select Results > Summary.

The Result Summary window displays listing all the selected measurements and their general statistics.

RT-Eye Quick Start User Manual

2. Use the scroll bar to view all the mea-

surements.

3. Click Export To CSV to export the

measurement data to a comma separated data file that can be used in other applications.

4. Click the Time Units drop-down box

and select Unit Interval (cycle duration of the recovered clock) or Seconds.

5. To view details of a specific measure-

ment, click Details.

The Results Details window displays.

Using the RT−Eye Software

6. From the Select Measurement drop-

down list, select the measurement for which you want details.

7. Read the details of your measurement

in the window.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Creating a New Report

Use the Report Generator utility to generate a compliance report. The report is a .rpt file that can only be viewed or printed from the Report Generator.

You can customize the contents and layout of the report using the advanced features of the Report Generator. Refer to the RT-Eye online help and the Report Generator online help for details.

By default, the report files are saved to the Reports directory as shown.

Generating a Report

To generate a report, perform the following steps:

1. Select Utilities > Reports.

2. Click Generate.

Wait until the report generator is finished.

RT-Eye Quick Start User Manual

When completed, the report displays. (Use the Alt+Tab key combination to bring the report to the front, if necessary.)

Printing a Report

Using the RT−Eye Software

3. To print the report, click the printer icon

in the Report Viewer toolbar.

4. Select a printer from the drop-down

list.

5. Make any adjustments that you want,

and click OK. (The Print dialog box may differ slightly, depending on the printer your are using.)

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Saving a Report

1. To save a report, click the save icon in

the Report Viewer toolbar.

The Save As window opens.

2. Select the directory in which you want to save the report (the default directory is Reports).

3. Enter the filename.

4. Click Save.

5. Close the Report Viewer window.

Viewing or Printing a Saved Report

Viewing a Saved Report

To view a saved report, perform the following steps:

1. Select Utilities > Reports.

2. Click Browse.

The Open window displays the default directory, Layouts.

RT-Eye Quick Start User Manual

3. Click the Up One Level icon, and then

double-click the Reports folder to open the Reports directory.

4. Browse to locate the file that you want

to view, and click the file name to select it.

5. Click Open.

Using the RT−Eye Software

6. Click View.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

The report that you selected is displayed.

You can print the viewed report. (See page 35, Printing a Report.)

7. Click the Close icon to close the Report Viewer.

Printing a Saved Report without Viewing

1. To print a saved report without viewing

it in the Report Viewer, perform steps 1 through 5 of the preceding procedure, and then click Print.

The Report Viewer window opens and a Report Viewer print dialog box displays. After the print job is sent, both windows close.

Note that the instrument does not display a Print setup dialog box when the report is printed using this method.

RT-Eye Quick Start User Manual

Logging Worst Case Waveforms

You can save the acquired waveforms to a set of .wfm files whenever a selected measurement exceeds the highest or lowest prior value.

To log worst case waveforms, perform the following procedure:

1. Select Log > Worst Case > Config-

ure.

The Worst Case Waveforms window displays.

2. Click ON in the Log section.

3. Click Browse to open a browse win-

dow.

Using the RT−Eye Software

4. Browse to the directory in which you

want to save the set of worst case files.

5. Click Open.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

6. If you want to clear existing waveform and .csv files from the selected directory, click Purge.

7. Click Start to take your selected measurements.

The measurement results display in the Results Summary window.

8. Select Log > Worst Case > File Names.

The File Names window displays the names of the measurements, sources, and worst case file names.

9. To turn off logging, click Config.

10. Click Off.

RT-Eye Quick Start User Manual

Using MyTest

You can use the MyTest feature to save and recall your current settings. This allows you to recall your customized setup at any time and display a Result Summary window with a single click of a button.

Saving MyTest

To save your settings at any time, perform the following procedure:

1. Select Measurements > Save

MyTest.

Your current set up is saved as MyTest.

To save your settings when exiting the RT-Eye application, perform the following procedure:

Using the RT−Eye Software

1. Select File > Exit.

The Exit RT-Eye dialogue window displays.

2. Check Save MyTest.

3. Click:

H Yes to restore the oscilloscope

settings when you exit the application

H No to exit without restoring

oscilloscope settings

H Cancel to cancel the exit (your

current setup will not be saved)

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Running MyTest

To run MyTest at anytime, perform the following procedure:

1. Select Measurements > Run MyTest.

The application restores the saved configuration, takes the measurements, and displays the results in the Result Summary window.

To run MyTest from the RT-Eye Welcome dialogue box, which displays when you start the RT-Eye application, perform the following procedure:

1. Start the RT-Eye application.

The RT-Eye Welcome dialogue box displays.

2. Click Run MyTest.

The application takes the measurements and displays the results in the Result Summary window.

Selecting Measurements and Using Autoset

You may want to take measurements other than those set up by the wizard. To select specific measurements, perform the following procedures:

1. Select Measurements > Select.

The Measurements window displays.

RT-Eye Quick Start User Manual

2. Select your probe type from the Probe

Type drop-down list box. The probe type affects the available measurements. (When you select Single Ended, measurements for Differential Skew, CM Voltage, and AC CM Voltage are added.)

3. Click the measurement buttons to turn

the measurements on or off, or click Select All to turn on all measurements.

Using the RT−Eye Software

4. Click Autoset, which performs a Verti-

cal, Horizontal, and Reference Level autoset to ensure accurate measurement results.

Note: You can set these levels manually. (See page 52, Ref Levels.)

Selecting Plots

You can display up to four plots (depending on your measurement selections). To select the plots for display, perform the following procedure:

1. Click Select Plots (or select Plots >

Select).

2. Click Select, if the tab is not active.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

3. In the Measurement drop-down boxes, select up to four measurements that you want plotted.

4. In the Plot Type drop-down boxes, select the plot type for each measurement that you selected. (Note that it is possible to select a measurement for which there is no plot.)

Configuring Plots

After you have selected the Measurement and associated plot type, you can further configure each of these. To configure a plot, perform the following procedure:

1. Click Configure.

The controls in the Configure section vary, depending on the type of measurements and plots that you previously selected in the Select window.

2. In this example, click 1 to display the Configure controls for an Eye Diagram plot.

3. Click the Bit Type drop-down box, and select the bit type that you want.

4. Click On or Off to toggle the display of masks.

5. Click Browse.

The Masks window opens.

RT-Eye Quick Start User Manual

6. Select the mask file that you want to

use, and then click Open.

Selecting and opening a mask toggles Mask on. Once selected, you can toggle the mask off or on.

For additional information on using masks, refer to the RT-Eye online help.

7. In this example, click 2 to display the

Configure controls for a Spectrum plot.

8. Click Linear or Log for the vertical axis

scale.

9. Click Linear or Log for the horizontal

axis scale.

Using the RT−Eye Software

10. In this example, click 3 to display the

Configure controls for a Histogram plot.

11. Click Linear or Log for the vertical axis

scale.

12. Click the Bin Resolution control to se-

lect the number of bins.

13. In this example, click 4 to display the

Configure controls for a Bathtub Curve.

14. Click Linear or Log to set the scale for

both axes.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

15. After you select and configure the plots that you want, click Start to take your measurements.

When sequencing is complete, the Plot Summary window displays up to four plots.

Reconfiguring Plots and Using the Bit Error Locator

In the following steps, you will:

H Make changes to display two plots: an eye diagram plot with a PCIExpress NTbit mask and the associated waveform

plot.

H Use the Plots Refresh button to reconfigure the plots without sequencing again.

H View the mask hits in the eye diagram plot.

H Use the Bit Error Locator function to see the mask hits (sample points) in red on the waveform.

16. Select Plots > Select.

RT-Eye Quick Start User Manual

17. Make the following changes:

H Change the second measurement

to Eye Width.

Using the RT−Eye Software

H Change the Plot Type to

Waveform.

H Change third and fourth

measurements to None.

18. Click Configure.

19. Click 1.

20. Click Browse.

21. Locate and select the PCI Express Di-

rectory in the Masks directory.

22. Click Open.

23. Select PCETxNTbit.msk.

24. Click Open.

The mask file is opened and Mask is toggled to On (if it was Off).

RT-Eye Quick Start User Manual

Using the RT−Eye Software

25. Click Select.

26. Click Refresh.

The reconfigured plots are displayed.

27. Click the Eye Diagram Details icon.

The details of the eye diagram are displayed.

28. Note the mask hits.

29. Click the Plot Summary Icon to display

both plots again.

30. Click the Waveform Details icon.

Note that the Bit Error Locator displays the waveform with the mask hits highlighted in red.

31. Click the Zoom in X icon.

32. Click the mask hits that you want to

see in detail (you may want to click multiple times to zoom in on the waveform).

RT-Eye Quick Start User Manual

33. Note the mask hits (sample hits), indi-

cated in red, on zoomed waveform.

Configuring Measurements

This topic contains information about advanced features of the RT-Eye application. Refer to the RT-Eye Serial Compliance and Analysis Online Help for additional information, if needed.

Choosing Probe Types and Measurement Sources

When started, the RT-Eye application is configured with a default probe type and source for the measurements. You can choose a different probe type and source, either manually or by using the Wizard. This section discusses how to manually choose a probe type and source.

Using the RT−Eye Software

You can set the probe type to Single Ended or Differential. To use a single-ended probe type, you must choose two source waveforms, nominally representing the V V waveforms may be two live waveforms, two reference waveforms, or two .csv files.

When you choose a Differential probe type, you must choose a single-source waveform. This waveform represents the output of a differential amplifier external to the oscilloscope, such as that contained in a differential probe. Again, the source may be a live channel, a reference waveform, or a .csv file.

negative

from V

to create a composite waveform on which the measurements are performed. The two source

positive

and V

inputs to a differential amplifier. The application subtracts

negative

Source

Use the Source window to configure the source of your measurements. The controls displayed in the window differ, depending on the probe type and source type that you select.

The following procedure configures the sources for a single ended probe type.

1. Select Measurements > Select.

The Select window displays.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

2. Select Single Ended from the Probe Type drop-down box.

3. Select Measurements > Configure > Source.

4. Select the source type. For this exam- ple, select Live.

5. Select your sources from the D+. D−

drop-down box.

The Autoset controls in the following steps are available only when the source type is Live.

6. Click Vertical Scale to autoset the waveforms to display full screen vertically based on the amplitude of the sources.

7. Click Horizontal Resolution to autoset the time base to the necessary horizontal resolution and record length to ensure accurate measurements.

8. Click Vertical & Horizontal to autoset both the vertical scale and the horizontal resolution.

The following procedure configures the source for a differential probe type.

1. Select Measurements > Select.

The Select window displays.

7 8

RT-Eye Quick Start User Manual

2. Select Differential from the Probe

Type drop-down box.

3. Select Measurements > Configure >

Source.

The Source window displays. This display is for a differential probe type with Live/Ref selected.

Using the RT−Eye Software

4. In the Differential drop-down box, se-

lect the source of the waveform on which you want to take measurements.

5. Click Vertical Scale to autoset the wa-

veform to display full screen vertically based on the amplitude of the source.

6. Click Horizontal Resolution to auto-

set the time base to the horizontal resolution and record length necessary for accurate measurements.

7. Click Vertical & Horizontal to autoset

both the vertical scale and the horizontal resolution.

8. Click Select to display the Select Mea-

surements window.

5 6

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Using the RT−Eye Software

Ref Levels

Use the Ref Levels window to set the high, middle and low reference voltages. The timing instants used by the measurements are precisely determined by when these voltage thresholds are crossed by the source waveform(s).

You can set any of the reference levels manually, or you can choose Ref Level Autoset so that the application automatically determines appropriate levels. If you do not set the reference levels either manually or using Autoset, the application will use default values which may cause unexpected measurement results.

Note that the Autoset button in the Measurements > Select window performs an autoset on the horizontal scale, vertical scale, and reference level. (See page 42, Selecting Measurements and Using Autoset.)

To set the reference level values automatically, which is the preferred method, perform the following procedure:

1. Click Ref Levels.

The Ref Level Autoset Setup window displays.

2. Click Run.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Smart Gating

Use gating to narrow the analysis to an area of the waveform specified by a gated region, filtering out unnecessary information. The Smart Gating window has controls for two types of gating. You can gate the region using vertical cursors, or you can use smart gating. If you use smart gating, you must set up a clock recovery window and an analysis window within the specified clock recovery window.

Using Cursors to Set a Gated Region. To set a gated region using cursors, perform the following procedure:

1. In the instrument menu bar, select

Cursors > Cursors On. Then select Cursors > Cursor Type > V-bars.

2. In the application menu bar, select

Measurements > Configure > Smart Gating.

The Smart Gating window displays.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

3. Click Cursors.

4. Use the multipurpose knobs on the in-

strument to position the cursors, defining the area of the waveform in which measurements will be taken.

5. Click Start to take measurements on the waveform between the cursors.

Using Smart Gating to Set Up a Gated Region. To set a gated region using smart gating, you must set up a Clock

Recovery Window, and then define your gated region by setting up an Analysis Window within the Clock Recovery Window.

Setting Up the Clock Recovery Window. Perform the following procedure:

1. Click Measurements > Configure > Smart Gating.

2. Click Smart Gating.

3. Click the Gating Units drop-down box,

and select the type of units that you want to use.

4. Click Start in the Clock Recovery Window, and enter the unit interval or edge within the record where the clock recovery starts.

5. Click Length in the Clock Recovery Window, and enter the length in unit intervals or edges of the window over which the application recovers the clock.

6. Note the unit interval or edge on which the clock recovery will stop.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

You can take measurements on multiple clock recovery windows within the waveform. To use multiple windows, perform these additional steps:

7. Check Enable Scan.

8. Click Scan Incr, and enter the number

of unit intervals or edges by which you want to each scan to be offset from the prior one.

9. Click #Scans, and enter the number of

scans that you want to make, or, if you want to scan the entire record, check

Scan to End of Record.

Setting Up the Analysis Window. After setting up the Clock Recovery Window, you must set up the Analysis Window.

There are three ways to set up the Analysis Window:

H The same as the Clock Recovery Window

H A smaller region centered within the Clock Recovery Window

H A user-defined region positioned anywhere within the Clock Recovery Window

To set up the Analysis Window, perform the one of the following procedures.

Setting the Analysis Window the same as the Clock Recovery Window.

1. Check Same as Clock Recovery Win-

dow. Your Analysis Window is now set

up.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Setting the Analysis Window Centered within the Clock Recovery Window.

1. Clear the Same as Clock Recovery Window check box.

2. Select Centered from the Alignment

drop-down box.

3. Click Length, and set the size of the

window in unit intervals or edges. Your Analysis Window is now set up.

Setting a User-Defined Analysis Window within the Clock Recovery Window.

1. To specify the absolute position of the

Analysis Window within the Clock Recovery Window, select User Defined from the Alignment drop-down box.

2. Click Start, and enter the unit interval or edge that you want the Analysis Window to start.

3. Click Length, and set the size of the window in unit intervals or edges. Your Analysis Window is now set up.

Clock Recovery

Use the following procedures to set up clock recovery using different clock recovery methods.

To set up clock recovery as a phaselocked loop with the bandwidth based on an industry standard method, perform the following procedure:

1. Click Clock Recovery.

The Clock Recovery window displays.

2. Click the Method drop-down box and select PLL:Standard BW.

RT-Eye Quick Start User Manual

3. Select the standard to which you want

to test from the Standard : b/s dropdown box.

4. Click the PLL Order drop-down box,

and select between a first-order or second-order loop.

5. If you select Second for the PLL Order,

click the Damping control, and enter a value for the damping ratio of the PLL.

6. Normally, the clock recovery software

automatically determines the bit rate of the waveform. To explicitly guide the clock recovery software, click On for the Nominal Data rate.

Using the RT−Eye Software

7. Click the Bit Rate control, and enter

the nominal bit rate in bits per second.

To set up the Clock Recovery at a PLL with a user-defined bandwidth, perform the following procedure:

1. Click the the Method drop-down box,

and select PLL: User BW.

2. Click the User BW control, and input

the bandwidth.

3. To use the other controls in this win-

dow, follow the instructions in the industry standard procedure (starting with step 4).

To set up the Clock Recovery to use the constant clock mean or the constant clock median method, perform the following procedure:

1. Click the Method drop-down box and

select Const Clk Mean or Const Clk

Median.

2. To explicitly guide the bit rate used by

the clock recovery software, do steps 6 and 7 in the industry standard procedure.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Jitter

Use the controls in the Jitter window to set up for Jitter@BER measurements. These controls are not required for a TIE jitter measurement.

If your waveform has a cyclically-repeating pattern and you know the pattern length in unit intervals, perform the following procedure:

1. Click Jitter.

2. Select Repeating in the Type drop-

down box.

3. Select from one of the industrystandard bit patterns in the Pattern drop-down box. If your pattern is not listed, choose Custom.

4. If you selected Custom as the pattern, then enter the pattern length.

4 5

5. Click the BER control, and enter the bit

error ratio. The eye opening and total jitter at this BER is extrapolated.

If your waveform does not have a repeating pattern, or has a repeating pattern for which you do not know the length, perform the following procedure:

1. Click Jitter.

2. Select Arbitrary in the Type drop-down

box.

3. Click the Window Length control to set the number of history bits used to calculate data-dependent jitter for each edge in the waveform (typically 5 to 10 bits).

4. Click the Population control to set the minimum population that each bit pattern must be observed before it is used as a basis for data-dependent jitter calculations (typically 100 to greater than

1000).

3 4

5. Click the BER control, and enter the bit error rate. The measurement will extrapolate the eye opening and total jitter at this BER.

RT-Eye Quick Start User Manual

Population

Use the controls in the Population window to set the maximum population on which the selected measurements are taken. In Free Run mode, sequencing will automatically halt when the specified population is reached on all measurements.

1. Click Population.

2. Click On.

3. Select Measurement or Acquisitions

in the Limit By drop-down box.

4. Click the Limit control, and specify the

number of measurements or acquisitions that you want to set as the limit.

General Config

Using the RT−Eye Software

Use the controls in the General Config window to set whether rise, fall, and amplitude measurements are limited to transition bits or all bits. You can also enable worst-case logging in the scan mode.

1. Click General Config.

2. Click to toggle the features.

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Setting Limits

The Serial Analysis module provides a Limits file that includes combinations of all measurements and statistical characteristics and an appropriate range of values for each combination. The application can use the Limits file and a mask file to determine the Pass or Fail status for compliance tests. You can view and edit existing files or create new limit files that meet your test needs.

Viewing the Current Limits

To view the current limits, perform the following procedure:

1. Select Measurements > Limits.

The Limits window displays.

2. Click Off.

3. Click Browse to find the Limits file that

you want to display.

4. Click Current.

The RT-Eye Limits Editor Editor opens and displays the values in the currently selected Limits file.

RT-Eye Quick Start User Manual

Editing the Currently Displayed Limit File

To edit the currently displayed Limit file, perform the following procedure:

5. Using the drop-down boxes and con-

trols, edit any measurement, statistic, lower limit, or upper limit that you want.

6. To add a new measurement, click + in

the toolbar. A new line is added with None selected as the measurement to the end of the list. Set up this measurement as you want.

7. To remove a measurement, select

None as the measurement, and click Compact. Compact removes all mea-

surements that are set to None.

8. Click Validate to verify that the limits

for each measurement are valid and that there are no duplicate measurements.

Using the RT−Eye Software

RT-Eye Quick Start User Manual

Using the RT−Eye Software

Viewing a Summary of the Limits

9. To view a summary of the currently dis- played file, select File > Show Summary.

The Summary window displays.

The summary table displays all the measurements, statistics, lower limits, and upper limits that you have set up.

10. Click OK.

RT-Eye Quick Start User Manual

Saving the Limits File

11. Click Cancel to close the editor with-

out saving any of your changes.

12. Click Save As to save your file. Be

sure to save the file with a different name, unless you want to overwrite the current file.

13. Close the RT-Eye Limits Editor.

Using Limits

14. After you select the Limits file that you

want to use, click On.

15. Click Start.

The Result Summary window displays.

Using the RT−Eye Software

16. Check the Status column for PASS/

FAIL results for the measurements on which you set limits.

RT-Eye Quick Start User Manual

Application Examples

Creating a Custom Compliance Module with Pass/Fail Limits

This application example shows you how to perform jitter analysis compliant with T11.2 MJSQ methodology using the spectrum approach. You will use the Setup Wizard to quickly set up and take your measurements and display plots, select an appropriate mask for the eye diagram, define a limits module, create a compliance report, and save your test so that you can run it when you start up the application again (or at any other time).

The signal used for this example is a 127 bit, PRBS repeating pattern. A Tektronix P7380SMA differential probe with phase-matched SMA cables is connected to the positive and negative outputs of a 2.5 Gb/s signal source. The differential probe is then connected to Channel 1 of the instrument.

The RT-Eye Serial Data Compliance and Analysis Application must be installed and enabled on your instrument.

Starting the RT-EyeApplication

1. Press AUTOSET on the front panel of

the instrument to view the differential signal.

2. Start the application:

H For non-B and non-C model

oscilloscopes, select File > Run Application > RT-Eye Serial Compliance and Analysis.

RT-Eye Quick Start User Manual

H For B and C model oscilloscopes,

select App > RT-Eye Serial Compliance and Analysis.

The RT-Eye application displays in the lower half of the screen.

Application Examples

Running the Setup Wizard

3. If the RT-Eye Welcome dialog box dis-

plays, click Run Wizard.

4. If the RT-Eye Welcome dialog box

does not display, select Measurements > Wizard0.

RT-Eye Quick Start User Manual

Application Examples

5. Make the following selections in the Setup Wizard:

Step 1Differential

Step 2Ch1

Step 3PCIE : 2.5G

Step 4Timing, Amplitude, TIE

Jitter, Jitter@BER, Repeating, 127 UI

Step 5Yes

Step 6Yes

Step 7Eye Diagram, Spectrum,

Bathtub Curve, Jitter Histogram

6. Click Run.

Viewing the Results

7. View the results.

The Plot Summary window displays the plots that you selected and the Results Summary window displays the measurements.

8. Click Details.

RT-Eye Quick Start User Manual

9. Select Jitter @ BER from the Select

Measurement drop-down box.

10. View the details of the Jitter @ BER

measurement.

Summary of Displayed Results

Application Examples

The three plots of jitter and the corresponding measurements represent a typical method of taking jitter measurements using the Spectrum Method of Rj/Dj separation.

The TIE histogram (lower left-hand plot) is the traditional method of measuring jitter on an oscilloscope. This method is limited by the amount of statistical certainty that can be achieved in a reasonable amount of time. More advanced DSP methods are used to determine the jitter eye opening, total jitter, random jitter, and deterministic Jitter.

The TIE measurements are transformed into the frequency domain by performing an FFT on the raw TIE data, creating the jitter spectrum shown in the upper right-hand plot. The spikes in the frequency domain represent deterministic jitter. Further analysis can be done to determine which spikes are Duty Cycle Distortion (DCD), which are Data Dependent Jitter (DDJ), and which are Periodic Jitter (PJ). Once these values are removed (DJ), then what is left is a noise floor which represents the Random Jitter (RJ).

These transformed values are used to create the Cumulative Distribution Function (CDF), commonly known as the Bathtub Curve, shown in the lower right−hand plot. The magenta line at 10 −12 BER represents the jitter eye opening measurement. As can be seen by the measurement results, the following equation applies:

Eye Opening @ BER = [1 UI − Total Jitter @ BER]

For more information about the spectrum approach to jitter measurements, refer to the MJSQ (Methodologies in Jitter and Signal Quality) PDF file at:

http://www.t11.org/ftp/t11/pub/fc/mjsq/04−101v4.pdf

RT-Eye Quick Start User Manual

Application Examples

Using a Mask

You have taken your measurements and viewed the associated plots. Now, you will display a custom or industry-standard mask on the Eye Diagram plot.

11. Select Plots > Config.

12. Click 1.

13. Click Browse.

The browse window opens.

14. Locate and select the PCI Express folder in the Masks directory.

15. Click Open.

RT-Eye Quick Start User Manual

16. Select PCETxNTbit.msk.

17. Click Open.

The mask file is opened and Mask is toggled to On (if it was Off).

18. Note that Mask automatically toggled

On when you opened the mask file.

Application Examples

19. Click Select.

20. Click Refresh.

The plots are recalculated using the measurements taken previously, and the Eye diagram is displayed with the mask that you selected.

21. Note that mask hits,if any, are dis-

played as white dots.

RT-Eye Quick Start User Manual

Application Examples

Defining a Limits Module

You have taken measurements, viewed plots, and added an industry-standard mask to your eye diagram, Now, you will create a limits module to apply a limit to the TIE Jitter measurement taken previously.

22. Select Measurements > Limits.

23. Click New.

The RT-Eye Limits Editor window opens.

24. Select TIE Jitter from the Measure-

ment drop-down box.

RT-Eye Quick Start User Manual

25. Select Min from the Statistic drop-

down box.

26. Enter −60ps in the Lower Lim box.

Application Examples

27. Click + to add another measurement.

28. Select TIE Jitter from the Measure-

ment drop-down box.

29. Select Max from the Statistic drop-

down box.

30. Enter 60ps in the Upper Lim box.

31. Click Save As.

The Save window displays.

RT-Eye Quick Start User Manual

Application Examples

32. Enter Jitter.lim as the file name.

33. Click Save.

The Save window closes.

34. Close the RT-Eye Limits Editior window.

35. Click Browse.

RT-Eye Quick Start User Manual

36. Select Jitter.lim as the limits file.

37. Click Open.

Application Examples

The Limits browse window closes.

38. Click On.

39. Select Results > Details.

40. Click Clear Results.

41. Click Start.

42. Select TIE Jitter.

43. Note the PASS/FAIL status of the mea-

surement limits that you set up in the Limits file.

3339

RT-Eye Quick Start User Manual

Application Examples

Creating a Compliance Report

You have taken measurements, viewed plots, added an industry-standard mask to your eye diagram, and created a Tie Jitter limits file. Now you will generate a compliance report. Perform the following steps:

44. Select Utilities > Reports.

45. Click Generate.

Wait until the report generator is finished.

When completed, the report displays. (Use the Alt+Tab key combination to bring the report to the front, if necessary.)

RT-Eye Quick Start User Manual

Using MyTest

You have created a custom compliance test module. Now you will use MyTest to save your test and run it automatically when you start the application (or whenever you want).

To save your settings as a MyTest file, perform the following procedure:

46. Select Measurements > Save

MyTest.

Your current setup is saved as MyTest.

47. Select File > Exit.

The Exit RT-Eye dialogue window displays.

Application Examples

48. Click No to exit without restoring oscil-

loscope settings.

RT-Eye Quick Start User Manual

Application Examples

To run MyTest from the RT-Eye Welcome dialogue box, which displays when you start the RT-Eye application, perform the following procedure:

49. Start the application:

H For non-B and non-C model

oscilloscopes, select File > Run Application > RT-Eye Serial Compliance and Analysis.

The RT-Eye Welcome dialogue box displays.

H For B and C model oscilloscopes,

select App > RT-Eye Serial Compliance and Analysis.

The RT-Eye Welcome dialogue box displays.

50. Click Run MyTest.

The application takes the measurements and displays the results in the Result Summary window.

51. If the RT-Eye Welcome window did not appear, then select Measurements >

Run MyTest.

The application takes the measurements and displays the results in the Result Summary window.

RT-Eye Quick Start User Manual

Index

Accessories, standard, 5 Application directories, location, 19 Application Examples, 64 Application installation, 5 Application set up, 21 Autoset Summary dialog window, 12

Bandwidth, system, 6 Bit Error Locator, 46

Calibration of oscilloscope and probes, 8 Clock Recovery, 56

Tektronix RT-Eye User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contacting Tektronix

Table of Contents

General Safety Summary

Preface

Documentation

Relevant Web Sites

Conventions Used in this Manual

Getting Started

Key Features

Using Compliance Modules

Ensuring Compatibility

Using Accessories

Installing the Application

Connecting to the Device Under Test

Calibrating the Oscilloscope and Probes

Operating Basics

Starting the RT-Eye Application

Defining Preferences

Hiding and Returning the RT-Eye Application

Minimizing and Maximizing the RT-Eye Application

Docking and Undocking the RT-Eye Application

Using the Sequencing Controls

Exiting the RT-Eye Application

RT-Eye Application User Interface and Menu Structure

Locating the Application Directories

Using the RT-Eye Software

Setting Up the Application

Viewing Plot Summaries

Viewing Plot Details

Exporting Plots to Files

Printing Plots

Viewing Results

Creating a New Report

Viewing or Printing a Saved Report

Logging Worst Case Waveforms

Using MyTest

Selecting Measurements and Using Autoset

Selecting Plots

Configuring Plots

Configuring Measurements

Setting Limits

Application Examples

Creating a Custom Compliance Module with Pass/Fail Limits

Index