Agilent N5394A DVI Electrical Performance Validation and Compliance Software

Transcription

1 Agilent N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation Agilent Technologies

2 Notices Agilent Technologies, Inc No part of this manual may be reproduced in any form or by any means (including electronic storage and retrieval or translation into a foreign language) without prior agreement and written consent from Agilent Technologies, Inc. as governed by United States and international copyright laws. Manual Part Number N Edition Fifth edition, August 2008 Printed in USA Agilent Technologies, Inc Garden of the Gods Road Colorado Springs, CO USA Warranty The material contained in this document is provided as is, and is subject to being changed, without notice, in future editions. Further, to the maximum extent permitted by applicable law, Agilent disclaims all warranties, either express or implied, with regard to this manual and any information contained herein, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Agilent shall not be liable for errors or for incidental or consequential damages in connection with the furnishing, use, or performance of this document or of any information contained herein. Should Agilent and the user have a separate written agreement with warranty terms covering the material in this document that conflict with these terms, the warranty terms in the separate agreement shall control. Technology Licenses The hardware and/or software described in this document are furnished under a license and may be used or copied only in accordance with the terms of such license. Restricted Rights Legend If software is for use in the performance of a U.S. Government prime contract or subcontract, Software is delivered and licensed as Commercial computer software as defined in DFAR (June 1995), or as a commercial item as defined in FAR 2.101(a) or as Restricted computer software as defined in FAR (June 1987) or any equivalent agency regulation or contract clause. Use, duplication or disclosure of Software is subject to Agilent Technologies standard commercial license terms, and non-dod Departments and Agencies of the U.S. Government will receive no greater than Restricted Rights as defined in FAR (c)(1-2) (June 1987). U.S. Government users will receive no greater than Limited Rights as defined in FAR (June 1987) or DFAR (b)(2) (November 1995), as applicable in any technical data. Safety Notices CAUTION A CAUTION notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in damage to the product or loss of important data. Do not proceed beyond a CAUTION notice until the indicated conditions are fully understood and met. WARNING A WARNING notice denotes a hazard. It calls attention to an operating procedure, practice, or the like that, if not correctly performed or adhered to, could result in personal injury or death. Do not proceed beyond a WARNING notice until the indicated conditions are fully understood and met.

3 DVI Automated Testing At A Glance The Agilent N5394A DVI Electrical Performance Validation and Compliance Software helps you verify DVI transmitter device under test (DUT) compliance to specifications with the Agilent 54854A/54855A, and 90000A series Infiniium Digital Storage Oscilloscope. The DVI Electrical Performance Validation and Compliance Software: Lets you select individual or multiple tests to run. Lets you identify the device being tested and its configuration. Shows you how to make oscilloscope connections to the device under test. Automatically checks for proper oscilloscope configuration. Automatically sets up the oscilloscope for each test. Provides detailed information for each test that has been run and lets you specify the thresholds at which marginal or critical warnings appear. Creates a printable HTML report of the tests that have been run. NOTE The tests performed by the DVI Electrical Performance Validation and Compliance Software are intended to provide a quick check of the electrical health of the DUT. This testing is not a replacement for an exhaustive test validation plan. Compliance testing measurements are described in Section 4.7, Electrical Measurement Procedures, in the DVI Specification Revision 1.0. For more information, see the DDWG (Digital Display Working Group) web site at Required Equipment and Software In order to run the DVI automated tests, you need the following equipment and software: 54854A/54855A, or 90000A series Infiniium Digital Storage Oscilloscope. Option 001 (1M/ch memory upgrade) is recommended; this will greatly reduce Data Eye Pattern and Jitter test times. Version A or greater of the Infiniium software (54854A/54855A, and series Infiniium Digital Storage Oscilloscope) Version 1.0 of the baseline software (90000A series Infiniium Digital Storage Oscilloscope) N5394A DVI Electrical Performance Validation and Compliance Software. Probes and/or test fixtures. For more information on the specific probes and test fixtures required, refer to the chapters that describe tests. DVI Compliance Testing Methods of Implementation 3

4 Keyboard, qty = 1, (provided with the Agilent 54854A/54855A, and 90000A series oscilloscope). Mouse, qty = 1, (provided with the Agilent 54854A/54855A, and 90000A series oscilloscope). Precision 3.5 mm BNC to SMA male adapter, Agilent p/n , qty = 2 (provided with the Agilent 54854A/54855A, and 90000A series oscilloscope). 50- ohm Coax Cable with SMA Male Connectors 24- inch or less RG- 316/U or similar, qty = 2, matched length. 4 DVI Compliance Testing Methods of Implementation

5 In This Book This manual describes the tests that are performed by the DVI Electrical Performance Validation and Compliance Software in more detail; it contains information from (and refers to) the DVI Specification Revision 1.0, and it describes how the tests are performed. Chapter 1, Installing the DVI Electrical Performance Validation and Compliance Software shows how to install and license the automated test application software (if it was purchased separately). Chapter 2, Preparing to Take Measurements shows how to start the DVI Electrical Performance Validation and Compliance Software and gives a brief overview of how it is used. Chapter 3, Transmitter Data Eye Pattern Tests contains more information on the data eye pattern tests. Chapter 4, Transmitter Jitter Tests contains more information on the clock jitter test. Chapter 5, Transmitter Transition Time Tests contains more information on the risetime/falltime tests. Chapter 6, Transmitter Inter- Pair Skew Tests contains more information on the inter- pair skew tests. Chapter 7, Cable Assembly Tests contains more information on testing cable assemblies. Appendix A, Calibrating the Digital Storage Oscilloscope describes how to calibrate the oscilloscope in preparation for running the DVI automated tests. Appendix B, INF_SMA_Deskew.set Setup File Details describes a setup used when performing channel de- skew calibration. Appendix C, InfiniiMax Probing describes the 1132A/1134A probe amplifier and probe head recommendations for DVI testing. See Also The DVI Electrical Performance Validation and Compliance Software s online help, which describes: Creating or opening a test project. Selecting tests. Configuring selected tests. Connecting the oscilloscope to the DUT. Running tests. Viewing test results. Viewing/printing the HTML test report. Saving test projects. DVI Compliance Testing Methods of Implementation 5

6 6 DVI Compliance Testing Methods of Implementation

7 Contents DVI Automated Testing At A Glance 3 Required Equipment and Software 3 In This Book 5 See Also 5 1 Installing the DVI Electrical Performance Validation and Compliance Software Installing the Software 9 Installing the License Key 9 2 Preparing to Take Measurements Acquiring Test Fixtures 12 Soldering Damping Resistors into Test Fixtures 15 Calibrating the Oscilloscope 16 Starting the DVI Electrical Performance Validation and Compliance Software 17 Online Help Topics 18 3 Transmitter Data Eye Pattern Tests Probing for Data Eye Pattern Tests 22 D0/D1/D2 - Eye Pattern Test Method of Implementation 24 Test Definition Notes from the Specification 24 Test Procedure 24 PASS Condition 26 Measurement Algorithm 26 Test References 26 4 Transmitter Jitter Tests Probing for Jitter Tests 28 Clock - Jitter Test Method of Implementation 30 Test Definition Notes from the Specification 30 Test Procedure 30 PASS Condition 31 Measurement Algorithm 31 Test References 31 DVI Compliance Testing Methods of Implementation 7

8 5 Transmitter Transition Time Tests Probing for Transition Time Tests 34 Transition Time Test Method of Implementation 36 Test Definition Notes from the Specification 36 Test Procedure 36 PASS Condition 37 Measurement Algorithm 37 Test References 37 6 Transmitter Inter-Pair Skew Tests 7 Cable Assembly Tests Probing for InterPairSkew Tests 40 D0/D1, D0/D2, D1/D2 - Skew Test Method of Implementation 42 Test Definition Notes from the Specification 42 Test Procedure 42 PASS Condition 44 Measurement Algorithm 44 Test References 44 Probing for Cable Assembly Eye Pattern Tests 46 D0/D1/D2 - Eye Pattern Test Method of Implementation 48 Test Definition Notes from the Specification 48 Test Procedure 48 PASS Condition 50 Measurement Algorithm 50 Test References 50 A Calibrating the Digital Storage Oscilloscope Required Equipment for Calibration 51 Internal Calibration 52 Cable and Probe Calibration 58 Channel-to-Channel De-skew 67 B INF_SMA_Deskew.set Setup File Details C InfiniiMax Probing Index 8 DVI Compliance Testing Methods of Implementation

9 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 1 Installing the DVI Electrical Performance Validation and Compliance Software Installing the Software 9 Installing the License Key 9 If you purchased the N5394A DVI Electrical Performance Validation and Compliance Software separately, you need to install the software and license key. Installing the Software 1 Make sure you have version A or higher of the Infiniium oscilloscope software (54854A/54855A and Series oscilloscope) OR version 1.00 or greater of baseline software (90000A Series oscilloscope) by choosing Help>About Infiniium... from the main menu. 2 To obtain the DVI Electrical Performance Validation and Compliance Software, go to Agilent website: 3 The link for DVI Electrical Performance Validation and Compliance Software will appear. Double- click on it and follow the instructions to download and install the application software. Be sure to accept the installation of the.net Framework software; it is required in order to run the DVI Electrical Performance Validation and Compliance Software. Installing the License Key 1 Request a license code from Agilent by following the instructions on the Entitlement Certificate. You will need the oscillocope s Option ID Number, which you can find in the Help>About Infiniium... dialog. 2 After you receive your license code from Agilent, choose Utilities>Install Option License... Agilent Technologies 9

10 1 Installing the DVI Electrical Performance Validation and Compliance Software 3 In the Install Option License dialog, enter your license code and click Install License. 4 Click OK in the dialog that tells you to restart the Infiniium oscilloscope application software to complete the license installation. 5 Click Close to close the Install Option License dialog. 6 Choose File>Exit. 7 Restart the Infiniium oscilloscope application software to complete the license installation. 10 DVI Compliance Testing Methods of Implementation

11 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 2 Preparing to Take Measurements Acquiring Test Fixtures 12 Calibrating the Oscilloscope 16 Starting the DVI Electrical Performance Validation and Compliance Software 17 Before running the DVI automated tests, you need to acquire the appropriate test fixtures, and you should calibrate the oscilloscope. After the oscilloscope has been calibrated, you are ready to start the DVI Electrical Performance Validation and Compliance Software and perform measurements. Agilent Technologies 11

12 2 Preparing to Take Measurements Acquiring Test Fixtures DVI test fixtures can be acquired from a distributor of Silicon Image parts or from the DDWG (Digital Display Working Group) (see the web site at Currently available test fixtures, called TPA2 fixtures in this document, include a CRU (Clock Recovery Unit) board and TPA2- P (plug) and TPA2- R (receptacle) adapter boards. The raw clock test points for these fixtures are T1 and T2 on the CRU board. Figure 1 TPA2-P (Plug) Adapter Board Figure 2 TPA2-R (Receptacle) Adapter Board (Top and Bottom Views) 12 DVI Compliance Testing Methods of Implementation

13 Preparing to Take Measurements 2 Figure 3 CRU (Clock Recovery Unit) Board (for TPA2 Fixtures) NOTE The CRU board must be configured according to the clock frequency in use. DVI Compliance Testing Methods of Implementation 13

14 2 Preparing to Take Measurements Earlier DVI plug and receptacle test fixtures from Silicon Image, called TPA fixtures in this document, had the CRU (Clock Recovery Unit) built- in. The raw clock test points for these fixtures are T2 and T3. Figure 4 TPA-P (Plug) Test Point Access Board Figure 5 TPA-R (Receptacle) Test Point Access Board 14 DVI Compliance Testing Methods of Implementation

15 Preparing to Take Measurements 2 Soldering Damping Resistors into Test Fixtures To get the best probed signal fidelity, the E2678A differential socket probe head for the 1132A/1134A InfiniiMax probe amplifier is recommended. This probing solution requires damping resistors to be soldered into test fixture boards at the data channel and raw clock test points. The proper damping resistors (and instructions for soldering them into a device under test) are included with the E2678A differential socket probe head. Figure 6 Damping Resistors Soldered into TPA2-P and CRU Boards DVI Compliance Testing Methods of Implementation 15

16 2 Preparing to Take Measurements Calibrating the Oscilloscope If you haven t already calibrated the oscilloscope, see Appendix A, Calibrating the Digital Storage Oscilloscope. NOTE If the ambient temperature changes more than 5 degrees Celsius from the calibration temperature, internal calibration should be performed again. The delta between the calibration temperature and the present operating temperature is shown in the Utilities>Calibration menu. NOTE If you switch cables between channels or other oscilloscopes, it is necessary to perform cable and probe calibration again. Agilent recommends that, once calibration is performed, you label the cables with the channel they were calibrated for. 16 DVI Compliance Testing Methods of Implementation

17 Preparing to Take Measurements 2 Starting the DVI Electrical Performance Validation and Compliance Software 1 From the Infiniium oscilloscope s main menu, choose Analyze>Automated Test Apps>DVI. Figure 7 The DVI Electrical Performance Validation and Compliance Software NOTE If DVI does not appear in the Automated Test Apps menu, the DVI Electrical Performance Validation and Compliance Software has not been installed (see Chapter 1, Installing the DVI Electrical Performance Validation and Compliance Software ). DVI Compliance Testing Methods of Implementation 17

18 2 Preparing to Take Measurements Figure 7 shows the DVI Electrical Performance Validation and Compliance Software main window. The task flow pane, and the tabs in the main pane, show the steps you take in running the automated tests: Select Tests Configure Connect Run Tests Results HTML Report Lets you select the tests you want to run. The tests are organized hierarchically so you can select all tests in a group. After tests are run, status indicators show which tests have passed, failed, or not been run, and there are indicators for the test groups. Lets you enter information about the device being tested and configure test parameters (like memory depth). This information appears in the HTML report. Shows you how to connect the oscilloscope to the device under test for the tests to be run. Starts the automated tests. If the connections to the device under test need to be changed while multiple tests are running, the tests pause, show you how to change the connection, and wait for you to confirm that the connections have been changed before continuing. Contains more detailed information about the tests that have been run. You can change the thresholds at which marginal or critical warnings appear. Shows a compliance test report that can be printed. You can choose between a verbose and compact report. Online Help Topics For information on using the DVI Electrical Performance Validation and Compliance Software, see its online help (which you can access by choosing Help>Contents... from the application s main menu). The DVI Electrical Performance Validation and Compliance Software s online help describes: Creating or opening a test project. Selecting tests. Configuring selected tests. Connecting the oscilloscope to the DUT. Running tests. Viewing test results. To show reference images and flash mask hits. To change margin thresholds. 18 DVI Compliance Testing Methods of Implementation

19 Preparing to Take Measurements 2 Viewing/printing the HTML test report. Saving test projects. DVI Compliance Testing Methods of Implementation 19

20 2 Preparing to Take Measurements 20 DVI Compliance Testing Methods of Implementation

21 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 3 Transmitter Data Eye Pattern Tests Probing for Data Eye Pattern Tests 22 D0/D1/D2 - Eye Pattern Test Method of Implementation 24 This section provides the Methods of Implementation (MOIs) for data eye pattern tests using an Agilent 54854A/54855A, or 90000A series Infiniium oscilloscope, 1132A/1134A probes, and the DVI Electrical Performance Validation and Compliance Software. Agilent Technologies 21

22 3 Transmitter Data Eye Pattern Tests Probing for Data Eye Pattern Tests When performing data eye pattern tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 8 or Figure 9). TPA2-P Adapter Board CRU Board DVI Source (DUT) DVI Connector Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier + - D0/D1/D2 Test Point + - Raw Clock SMA to SMA Cables 54854A/54855A Oscilloscope + - Ch2 Ch3 Ch4 Recovered Clock SMA to BNC Cable Figure 8 Probing for Data Eye Pattern Tests (TPA2 Fixture) TPA-P Test Access Board DVI Source (DUT) DVI Connector D0/D1/D2 Test Point + - E2678A Differential Socket Probe Head Damping Resistors 1132A/1134A Probe Amplifier Recovered Clock 54854A/54855A Oscilloscope SMA to BNC Cable Ch2 Ch3 Ch4 Figure 9 Probing for Data Eye Pattern Tests (TPA Fixture) 22 DVI Compliance Testing Methods of Implementation

23 Transmitter Data Eye Pattern Tests 3 You can use any of the oscilloscope channels for the recovered clock and data test point. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 8 and Figure 9 are just for example.) For more information on the 1132A/1134A probe amplifiers and differential probe heads, see Appendix C, InfiniiMax Probing, starting on page 75. DVI Compliance Testing Methods of Implementation 23

24 3 Transmitter Data Eye Pattern Tests D0/D1/D2 - Eye Pattern Test Method of Implementation Data eye pattern measurements are made as a differential measurements using the recovered clock signal as the oscilloscope trigger source. The transmitter drives the pseudo- random data test pattern and the test ensures that the eye diagram limits given by the DVI spec are not exceeded. Test Definition Notes from the Specification Test Procedure See section 4.7.6, Transmitter Eye, in the DVI Specification Revision Attach a DVI monitor to the DVI source (DUT). 2 Select a resolution for test, and display the pseudo random pattern in full screen mode. 3 Unplug the monitor, and connect the TPA2 plug adapter board directly to the output of the DVI source. 4 Confirm the frequency output of the DVI source by measuring RC+ and RCon the TPA2 plug board with the oscilloscope. 5 Set the CRU board to operate at the correct frequency. 6 Allow the CRU board to warm up for 5 minutes. 7 Attach the SMA to SMA cables from RC+ and RC- on the TPA2 plug board to the respective SMA connectors on the CRU board. 8 Start the automated testing application as described in Starting the DVI Electrical Performance Validation and Compliance Software" on page In the DVI Test application, click the Select Tests tab. 10 Navigate to the Data Eye Pattern group, and check the appropriate Eye Pattern test (D0, D1, or D2). 24 DVI Compliance Testing Methods of Implementation

25 Transmitter Data Eye Pattern Tests 3 Figure 10 Selecting Data Eye Pattern Tests 11 Follow the DVI Test application s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 1 Data Eye Pattern Test Configuration Options Configuration Option Device Description Test Fixture Recovered Clock Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. The recovered clock from TPA will have 2.5 times the frequency of the raw clock. TPA2 however will have the same frequency for both clocks. Identifies the oscilloscope channel probing the recovered clock. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq [Screen Resolution] Mask Type Identifies the frequency of the DVI interface you are testing. You can select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Choose Normalized Eye Pattern Mask at TP2. DVI Compliance Testing Methods of Implementation 25

26 3 Transmitter Data Eye Pattern Tests Table 1 Data Eye Pattern Test Configuration Options (continued) Configuration Option # Unit Interval Available in Debug Mode, this option specifies the number of UI (Unit Intervals) to measure in the data eye pattern test. The DVI revision 1.0 specification recommends 100,000 acquisitions to achieve 99% confidence within 1% error of the mean value. For full compliance, a measurement of 1,000,000 acquisitions must be made. Note that increasing the number of UI has a negative impact on the run time of the data eye pattern tests. Value used in Compliance Mode: 100,000. Manual Mask Adjustment Composite Eye Worst Eye Location Description Specifies whether the manual mask adjustment is needed prior to the mask test. Available in Debug Mode, this option specifies whether all data bits in a pixel need to be overlapped in the eye diagram. Value used in Compliance Mode: Off. Available in Debug Mode, this option specifies the location of the worst eye in respect to the rising edge of the recovered clock. This parameter will be ignored if Composite Eye is turned ON. Choose auto to let the application automatically find the worst eye. The worst eye is defined as the bit having the smallest pulse width. Select only 1-4 for the TPA test fixture. Value used in Compliance Mode: Auto. PASS Condition Zero mask failures. Measurement Algorithm Test References 1 Trigger on the recovered clock; the data lane is being viewed in color grade form. 2 Repeat step 1 until the # Unit Intervals has been reached. 3 The test passes if none of the waveform sample points falls into the mask failure region. Section 4.3, Transmitter Electrical Specifications, in the DVI Specification Revision DVI Compliance Testing Methods of Implementation

27 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 4 Transmitter Jitter Tests Probing for Jitter Tests 28 Clock - Jitter Test Method of Implementation 30 This section provides the Methods of Implementation (MOIs) for jitter tests using an Agilent 54854A/54855A, or 90000A series Infiniium oscilloscope, probes, and the DVI Electrical Performance Validation and Compliance Software. If you are using the TPA2 fixtures, the raw clock test points are T1 and T2 on the CRU board. However, if you are using the TPA fixtures, the raw clock test points are T2 and T3. Agilent Technologies 27

28 4 Transmitter Jitter Tests Probing for Jitter Tests When performing the clock jitter test, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 11 or Figure 12). DVI Source (DUT) DVI Connector TPA2-P Adapter Board + - Raw Clock SMA to SMA Cables CRU Board Test Point Recovered Clock 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier SMA to BNC Cable Figure 11 Probing for Jitter Tests (TPA2 Fixture) DVI Source (DUT) DVI Connector TPA-P Test Access Board Raw Clock Test Point - + Recovered Clock SMA to BNC Cable Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 12 Probing for Jitter Tests (TPA Fixture) 28 DVI Compliance Testing Methods of Implementation

29 Transmitter Jitter Tests 4 You can use any of the oscilloscope channels for the recovered clock and raw clock test point. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 11 and Figure 12 are just for example.) DVI Compliance Testing Methods of Implementation 29

30 4 Transmitter Jitter Tests Clock - Jitter Test Method of Implementation The jitter measurement in the raw clock is performed as a differential measurement of the rising edge of the clock signal (clk+ minus clk- ). The clock signal from the clock recovery unit must be used as a trigger source. Test Definition Notes from the Specification Test Procedure See section 4.7.7, Jitter Measurement, in the DVI Specification Revision Start the automated testing application as described in Starting the DVI Electrical Performance Validation and Compliance Software" on page In the DVI Test application, click the Select Tests tab. 3 Navigate to the Jitter group, and check the Clock - Jitter test. Figure 13 Selecting Jitter Tests 4 Follow the DVI Test application s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. 30 DVI Compliance Testing Methods of Implementation

31 Transmitter Jitter Tests 4 Table 2 Clock Jitter Test Configuration Options Configuration Option Device Description Test Fixture Recovered Clock Raw Clock Test Freq [Screen Resolution] Number of edges (Jitter) Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. Identifies the oscilloscope channel probing the recovered clock. Identifies the oscilloscope channel probing the raw clock. Identifies the frequency of the DVI interface you are testing. You can select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Specifies the number of differential clock signal acquisitions to use when performing the jitter measurement. PASS Condition 0.25 T bit The bit time T bit is one tenth of the pixel time. The bit time is also referred to as one Unit Interval, or UI, in the jitter and eye diagram specification. Measurement Algorithm Test References 1 Trigger on the recovered clock; the raw clock signal is being viewed in color grade form. 2 Repeat step 1 until "Number of edges" has been acquired. 3 Jitter is the width the of signal at 50% crossing. (Measure using histogram.) Section 4.6, Jitter Specifications, in the DVI Specification Revision 1.0. DVI Compliance Testing Methods of Implementation 31

32 4 Transmitter Jitter Tests 32 DVI Compliance Testing Methods of Implementation

33 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 5 Transmitter Transition Time Tests Probing for Transition Time Tests 34 Transition Time Test Method of Implementation 36 If you are using the TPA2 fixtures, the raw clock test points are T1 and T2 on the CRU board. However, if you are using the TPA fixtures, the raw clock test points are T2 and T3. Agilent Technologies 33

34 5 Transmitter Transition Time Tests Probing for Transition Time Tests When performing transition time tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in the figures that follow). TPA2-P Adapter Board DVI Source (DUT) DVI Connector D0/D1/D2 Test Point + - Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 14 Probing Data Channels for Transition Time Tests (TPA2 Fixture) DVI Source (DUT) DVI Connector TPA2-P Adapter Board + - Raw Clock SMA to SMA Cables CRU Board Test Point Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 15 Probing Raw Clock for Transition Time Tests (TPA2 Fixture) 34 DVI Compliance Testing Methods of Implementation

35 Transmitter Transition Time Tests 5 TPA-P Test Access Board DVI Source (DUT) DVI Connector D0/D1/D2 Test Point + - E2678A Differential Socket Probe Head Damping Resistors 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 16 Probing Data Channels for Transition Time Tests (TPA Fixture) TPA-P Test Access Board DVI Source (DUT) DVI Connector Raw Clock Test Point - + Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 17 Probing Raw Clock for Transition Time Tests (TPA Fixture) You can use any of the oscilloscope channels for the data and raw clock test points. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in the preceding figures are just for example.) DVI Compliance Testing Methods of Implementation 35

36 5 Transmitter Transition Time Tests Transition Time Test Method of Implementation Risetime/falltime is a differential measurement across the outputs of a differential pair. The transition is defined as the time interval between the normalized 20% and 80% amplitude levels. Test Definition Notes from the Specification Test Procedure See section 4.7.4, Transmitter Rise/Fall Time, in the DVI Specification Revision Start the automated testing application as described in Starting the DVI Electrical Performance Validation and Compliance Software" on page In the DVI Test application, click the Select Tests tab. 3 Navigate to the Transition Time group and the Clock or Data group, and check the appropriate risetime/falltime test. Figure 18 Selecting Transition Time Tests 36 DVI Compliance Testing Methods of Implementation

37 Transmitter Transition Time Tests 5 4 Follow the DVI Test application s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 3 Transition Time Test Configuration Options Configuration Option Device Description Test Fixture Raw Clock Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. Identifies the oscilloscope channel probing the raw clock. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq [Screen Resolution] Number of edges (Transition Time) Identifies the frequency of the DVI interface you are testing. You can select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Specifies the number of acquisitions to use when performing the rise/fall time measurements. PASS Condition 75 ps Risetime/Falltime 0.4 T bit The bit time T bit is one tenth of the pixel time. The bit time is also referred to as one Unit Interval, or UI, in the jitter and eye diagram specification. Measurement Algorithm Test References The oscilloscope is set up to look for a waveform with 7 bits of 0 followed by 7 bits of 1 inside the pseudo- random pattern (using advanced comm triggering). When this waveform is found, it is used to determine V top (100%) and V base (0%) for the rise/fall time measurements. All subsequent risetime/falltime measurements are performed using simple edge triggering only. Section 4.3, Transmitter Electrical Specifications, in the DVI Specification Revision 1.0. DVI Compliance Testing Methods of Implementation 37

38 5 Transmitter Transition Time Tests 38 DVI Compliance Testing Methods of Implementation

39 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 6 Transmitter Inter-Pair Skew Tests Probing for InterPairSkew Tests 40 D0/D1, D0/D2, D1/D2 - Skew Test Method of Implementation 42 Agilent Technologies 39

40 6 Transmitter Inter-Pair Skew Tests Probing for InterPairSkew Tests When performing inter- pair skew tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 19 or Figure 20). NOTE Be sure to match the polarity of the differential probe to the polarity of the probed signals; otherwise, the tests will not run correctly. TPA2-P Adapter Board DVI Source (DUT) DVI Connector Data Channel + Test Points E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 19 Probing for Inter-Pair Skew Tests (TPA2 Fixture) 40 DVI Compliance Testing Methods of Implementation

41 Transmitter Inter-Pair Skew Tests 6 TPA-P Test Access Board DVI Source (DUT) DVI Connector + Data Channel - Test Points + - E2678A Differential Socket Probe Head Damping Resistors 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 20 Probing for Inter-Pair Skew Tests (TPA Fixture) You can use any of the oscilloscope channels for the data test points. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 19 and Figure 20 are just for example.) DVI Compliance Testing Methods of Implementation 41

42 6 Transmitter Inter-Pair Skew Tests D0/D1, D0/D2, D1/D2 - Skew Test Method of Implementation The transmitter skew is the time difference between the two differential signals measured at the normalized 50% crossover point. The trigger source can be either one of the differential signals. Channel- to- channel de- skew must be performed on the two oscilloscope channels used for this measurement (see Channel- to- Channel De- skew" on page 67). Test Definition Notes from the Specification Test Procedure See section 4.7.5, Transmitter Skew Measurement, in the DVI Specification Revision Start the automated testing application as described in Starting the DVI Electrical Performance Validation and Compliance Software" on page In the DVI Test application, click the Select Tests tab. 3 Navigate to the InterPairSkew group, and check the appropriate skew test. 42 DVI Compliance Testing Methods of Implementation

43 Transmitter Inter-Pair Skew Tests 6 Figure 21 Selecting InterPairSkew Tests 4 Follow the DVI Test application s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 4 InterPairSkew Test Configuration Options Configuration Option Device Description Test Fixture Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq [Screen Resolution] Number of edges (InterPairSkew) Identifies the frequency of the DVI interface you are testing. You can select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Specifies the number of acquisitions to use when performing the inter-pair skew measurements. DVI Compliance Testing Methods of Implementation 43

44 6 Transmitter Inter-Pair Skew Tests PASS Condition 0.20 T pixel The pixel time T pixel is the time period of the raw clock. Measurement Algorithm Test References 1 Trigger on the rising edge of the lowest data lane number. (D0/D1 use D0, etc.). 2 Measure the time from the first signal's rising edge to the second signal s rising edge at 50% crossing. 3 Repeat step 2 for the "Number of edges", record the worst value. 4 Repeat steps 1 through 3 for the falling edge. 5 Report the worst rising skew, falling skew, and the worst among both. Section 4.3, Transmitter Electrical Specifications, in the DVI Specification Revision DVI Compliance Testing Methods of Implementation

45 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation 7 Cable Assembly Tests Probing for Cable Assembly Eye Pattern Tests 46 D0/D1/D2 - Eye Pattern Test Method of Implementation 48 This section provides the Methods of Implementation (MOIs) for data eye pattern tests using an Agilent 54854A/54855A, or 90000A series Infiniium oscilloscope, 1132A/1134A probes, and the DVI Electrical Performance Validation and Compliance Software. Agilent Technologies 45

46 7 Cable Assembly Tests Probing for Cable Assembly Eye Pattern Tests When performing cable assembly eye pattern tests, the DVI Electrical Performance Validation and Compliance Software will prompt you to make the proper connections (also shown in Figure 22 or Figure 23). TPA2-R Adapter Board CRU Board DVI Source (DUT) DVI Receptacle DVI Plug DVI Cable Assembly DVI Plug DVI Receptacle Damping Resistors E2678A Differential Socket Probe Head + - D0/D1/D2 Test Point + - Raw Clock SMA to SMA Cables A/54855A Oscilloscope Recovered Clock SMA to BNC Cable 1132A/1134A Probe Amplifier Ch2 Ch3 Ch4 Figure 22 Probing for Cable Assembly Eye Pattern Tests (TPA2 Fixture) TPA-R Test Access Board DVI Source (DUT) DVI Receptacle DVI Plug DVI Cable Assembly DVI Plug DVI Receptacle D0/D1/D2 Test Point - + Recovered Clock SMA to BNC Cable Damping Resistors E2678A Differential Socket Probe Head 1132A/1134A Probe Amplifier 54854A/54855A Oscilloscope Ch2 Ch3 Ch4 Figure 23 Probing for Cable Assembly Eye Pattern Tests (TPA Fixture) 46 DVI Compliance Testing Methods of Implementation

47 Cable Assembly Tests 7 You can use any of the oscilloscope channels for the recovered clock and data test point. You identify the channels used for each signal in the Configuration tab of the DVI Electrical Performance Validation and Compliance Software. (The channels shown in Figure 22 and Figure 23 are just for example.) DVI Compliance Testing Methods of Implementation 47

48 7 Cable Assembly Tests D0/D1/D2 - Eye Pattern Test Method of Implementation Data eye pattern measurements are made as differential measurements using the recovered clock signal as the oscilloscope trigger source. Test Definition Notes from the Specification Test Procedure See section 4.7.6, Transmitter Eye, in the DVI Specification Revision Attach a DVI monitor to the DVI source (DUT). 2 Select a resolution for test, and display the pseudo random pattern in full screen mode. 3 Unplug the monitor, and connect the TPA2 plug adapter board directly to the output of the DVI source. 4 Confirm the frequency output of the DVI source by measuring RC+ or RCon the TPA2 plug board with the oscilloscope. 5 Set the CRU board to operate at the correct frequency. 6 Allow the CRU board to warm up for 5 minutes. 7 Attach the SMA to SMA cables from RC+ and RC- on the TPA2 plug board to the respective SMA connectors on the CRU board. 8 Start the automated testing application as described in Starting the DVI Electrical Performance Validation and Compliance Software" on page In the DVI Test application, click the Select Tests tab. 10 Navigate to the Data Eye Pattern group, and check the appropriate Eye Pattern test (D0, D1, or D2). 48 DVI Compliance Testing Methods of Implementation

49 Cable Assembly Tests 7 Figure 24 Selecting Data Eye Pattern Tests 11 Follow the DVI Test application s task flow to set up configuration options, make oscilloscope connections, run the test, and view the test results. Table 5 Cable Assembly Test Configuration Options Configuration Option Device Description Test Fixture Recovered Clock Description Lets you enter information about the device under test, including the device ID and any comments that you wish to include. Identifies the revision of your test fixture. Agilent recommends test fixture TPA2. The recovered clock from TPA will have 2.5 times the frequency of the raw clock. TPA2 however will have the same frequency for both clocks. Identifies the oscilloscope channel probing the recovered clock. D0/D1/D2 Identifies the oscilloscope channels probing data channel links D0, D1, and D2. Test Freq [Screen Resolution] Mask Type Identifies the frequency of the DVI interface you are testing. You can select one of the frequencies from the drop-down list, or you can enter a frequency in the range from 25 to 165 MHz. Choose either Cable Test Low-amplitude Eye Mask or Cable Test High-amplitude Eye Mask. DVI Compliance Testing Methods of Implementation 49

50 7 Cable Assembly Tests Table 5 Cable Assembly Test Configuration Options Configuration Option # Unit Interval Available in Debug Mode, this option specifies the number of UI (Unit Intervals) to measure in the data eye pattern test. The DVI revision 1.0 specification recommends 100,000 acquisitions to achieve 99% confidence within 1% error of the mean value. For full compliance, a measurement of 1,000,000 acquisitions must be made. Note that increasing the number of UI has a negative impact on the run time of the data eye pattern tests. Value used in Compliance Mode: 100,000. Manual Mask Adjustment Composite Eye Worst Eye Location Description Specifies whether the manual mask adjustment is needed prior to the mask test. Available in Debug Mode, this option specifies whether all data bits in a pixel need to be overlapped in the eye diagram. Value used in Compliance Mode: Off. Available in Debug Mode, this option specifies the location of the worst eye in respect to the rising edge of the recovered clock. This parameter will be ignored if Composite Eye is turned ON. Choose auto to let the application automatically find the worst eye. The worst eye is defined as the bit having the smallest pulse width. Select only 1-4 for the TPA test fixture. Value used in Compliance Mode: Auto. PASS Condition Zero mask failures. Measurement Algorithm Test References 1 Trigger on the recovered clock; the data lane is being viewed in color grade form. 2 Repeat step 1 until the # Unit Intervals has been reached. 3 The test passes if none of the waveform sample points falls into the mask failure region. Section 4.5, Cable Assembly Specifications, in the DVI Specification Revision DVI Compliance Testing Methods of Implementation

51 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation A Calibrating the Digital Storage Oscilloscope Required Equipment for Calibration 51 Internal Calibration 52 Cable and Probe Calibration 58 Channel-to-Channel De-skew 67 This appendix describes the Agilent 54854A/54855A, or 90000A series digital storage oscilloscope calibration procedures. Required Equipment for Calibration To calibrate the 54854A/54855A, or 90000A series oscilloscope in preparation for running the DVI automated tests, you need the following equipment: Keyboard, qty = 1, Mouse, qty = 1, Precision 3.5 mm BNC to SMA male adapter, Agilent p/n , qty = 2 Calibration cable BNC shorting cap 50- ohm Coax Cable with SMA Male Connectors 24- inch or less RG316/U or similar, qty = 2, matched length. SMA T- adapter. BNC to SMA male adapter, qty = 1. Figure 25 below shows an example of the above mentioned cables and connectors needed. Agilent Technologies 51

52 A Calibrating the Digital Storage Oscilloscope Figure 25 Additional Cables and Adapters Internal Calibration This will perform an internal diagnostic and calibration cycle for the oscilloscope. For the Agilent oscilloscope, this is referred to as Calibration. This Calibration will take about 20 minutes. Perform the following steps: 1 Set up the oscilloscope with the following steps: a Connect the keyboard, mouse, and power cord to the rear of the oscilloscope. b If SigTest is being used on the oscilloscope, then connect a second monitor to the VGA connector located near the LAN port, on the rear of the oscilloscope. c Plug in the power cord. d Turn on the oscilloscope by pressing the power button located on the lower left of the front panel. e Allow the oscilloscope to warm up at least 30 minutes prior to starting the calibration procedure in step 3 below. 2 Locate and prepare the accessories that will be required for the internal calibration: a Locate the BNC shorting cap. b Locate the calibration cable. c Locate the two Agilent precision SMA/BNC adapters. d Attach one SMA adapter to one end of the calibration cable - hand tighten snugly. e Attach the other SMA adapter to the other end of the calibration cable - hand tighten snugly. 52 DVI Compliance Testing Methods of Implementation

53 Calibrating the Digital Storage Oscilloscope A 3 Referring to Figure 26 below, perform the following steps: a Click on the Utilities>Calibration menu to open the Calibration window. Click here to open the calibration window. Figure 26 Accessing the Calibration Menu. 4 Referring to Figure 27 below, perform the following steps to start the calibration: a Uncheck the Cal Memory Protect checkbox. b Click the Start button to begin the calibration. DVI Compliance Testing Methods of Implementation 53

54 A Calibrating the Digital Storage Oscilloscope Uncheck this first Then click here to start Figure 27 Oscilloscope Calibration Menu. 5 Follow the on- screen instructions: a b c You will be prompted to disconnect everything from all the inputs, click the OK button. Then, you will be prompted to connect BNC shorting cap to a specified input. Install the BNC shorting cap by pressing it on the specified input BNC, and turning right. Click the OK button after moving the BNC cap to each specified channel. Then you will be prompted to connect the calibration cable with SMA adapters between the Aux Out and a specified input, as shown in the example in Figure 28 below. Install the SMA adapter by pressing it on input BNC, and hand tightening the outer ring turning right. Click the OK button after connecting the cable as prompted. 54 DVI Compliance Testing Methods of Implementation

55 Calibrating the Digital Storage Oscilloscope A Precision SMA Adapter on Aux Out Precision SMA Adapter on Channel 1 Input Calibration Cable Figure 28 Calibration Cable Connection Example. d e f Early during the calibration of channel 1, you will be prompted to perform a Time Scale Calibration, as shown in Figure 29 below. Click on the Default button to continue the calibration, using the Factory default calibration factors. When the calibration procedure is complete, you will be prompted with a Calibration Complete message window. Click the OK button to close this window. DVI Compliance Testing Methods of Implementation 55

56 A Calibrating the Digital Storage Oscilloscope Click Default Figure 29 Time Scale Calibration Menu. 6 Referring to Figure 30 below, perform the following steps: a b c d Confirm that the Vertical and Trigger Calibration Status for all Channels passed. Click the Close button to close the calibration window. The internal calibration is completed. Read NOTE below. 56 DVI Compliance Testing Methods of Implementation

57 Calibrating the Digital Storage Oscilloscope A Delta Calibration Temperature Verify Calibration Passed Close this menu Figure 30 Calibration Status Screen. NOTE These steps do not need to be performed every time a test is run. However, if the ambient temperature changes more than 5 degrees Celsius from the calibration temperature, this calibration should be performed again. The delta between the calibration temperature and the present operating temperature is shown in the Utilities>Calibration menu. DVI Compliance Testing Methods of Implementation 57

58 A Calibrating the Digital Storage Oscilloscope Cable and Probe Calibration Perform a 50- ohm direct- coupled input calibration for the SMA interface of channel 1 and channel 3. This calibration compensates for gain, offset, and skew errors in cables and probes. Perform the following steps. 1 Referring to the Figure 31 below, perform the following steps: a b c d e f Locate and connect one of the Agilent precision SMA adapters to the Channel 1 oscilloscope input. Locate and connect the other Agilent precision SMA adapter to the Channel 3 oscilloscope input. Locate and connect one end of one of the RG- 316 cables to the SMA adapter on Channel 1. Locate and connect one end of the other RG- 316 cable to the SMA adapter on Channel 3. Locate and connect the non- Agilent SMA/BNC adapter to the Aux Out BNC on the oscilloscope. Connect the other end of the cable attached to Channel 1 to the SMA adapter on the Aux Out. Channel 1 Channel 3 Aux Out Figure 31 Vertical Input Calibration Connections (Cable on Channel 3 not shown). 58 DVI Compliance Testing Methods of Implementation

59 Calibrating the Digital Storage Oscilloscope A 2 Referring to Figure 32 below, perform the following steps: a b Click on the Setup>Channel 1 menu to open the Channel Setup window. Click the Probes button in the Channel Setup window, to open the Probe Setup window. Click Setup Channel 1 Click here for Probe Setup Menu Figure 32 Channel Setup Window. DVI Compliance Testing Methods of Implementation 59

60 A Calibrating the Digital Storage Oscilloscope 3 Referring to Figure 33 below, perform the following steps: a Click the Configure Probing System button, and then click on User Defined Probes. Click here Then click here Figure 33 Probe Setup Window. 60 DVI Compliance Testing Methods of Implementation

61 Calibrating the Digital Storage Oscilloscope A 4 Referring to Figure 34 below, perform the following steps: a Click on the Calibrate Probe button to open the Probe Calibration window. Click Here Figure 34 User Defined Probe Window. 5 Referring to Figure 35 below, perform the following steps: a b Select the Calibrated Atten/Offset Radio Button Click the Start Atten/Offset Calibration Button to open the Calibration window. DVI Compliance Testing Methods of Implementation 61

62 A Calibrating the Digital Storage Oscilloscope Select Calibrated Atten/Offset Then Click Here Figure 35 Probe Calibration Window. 6 Referring to Figure 36 shown below, perform the following steps: a Ignore the instructions shown in the dialog box. b Click the OK button on the Calibration window. c The calibration should complete in about 10 seconds. Click OK Figure 36 Calibration Window. 62 DVI Compliance Testing Methods of Implementation

63 Calibrating the Digital Storage Oscilloscope A 7 Referring to Figure 37 below, perform the following steps: a Click OK to close the Probe Calibration Done window. Click to close this window Figure 37 Probe Calibration Done Window. 8 Referring to Figure 38 below, perform the following steps: a b Select the Calibrated Skew Radio button in the Probe Calibration window Click the Start Skew Calibration button Select Calibrated Skew Then Click Here Figure 38 Probe Calibration Window. 9 Referring to Figure 39 shown below, perform the following steps: a Ignore the instructions shown in the dialog box. b Click the OK button on the Calibration window. c The calibration should complete in about 10 seconds. DVI Compliance Testing Methods of Implementation 63

64 A Calibrating the Digital Storage Oscilloscope Click OK Figure 39 Calibration Window. 10 Referring to Figure 40 below, perform the following steps: a Click OK to close the Probe Calibration Done window. Click to close this window Figure 40 Calibration Window. 64 DVI Compliance Testing Methods of Implementation

65 Calibrating the Digital Storage Oscilloscope A 11 Referring to Figure 41 below, perform the following steps: a Click the Close button to close this window. Click Close Figure 41 Calibration Window. DVI Compliance Testing Methods of Implementation 65

66 A Calibrating the Digital Storage Oscilloscope 12 Referring to Figure 42 below, perform the following steps: a Click on the Channel 3 tab. Click on Channel 3 Tab Figure 42 Calibration Window. 13 Referring to Figure 31 on page 58, perform the following steps: a Disconnect the RG- 316 cable connected to the SMA adapter on the Aux Out. b Connect the other end of the RG- 316 cable connected to the SMA adapter on Channel 3, to the SMA adapter on the Aux Out. 14 Repeat steps 3 through 11 of this section to calibrate the cable on Channel Click the Close button on the Probe Setup window (Figure 42) to close this window. 16 Click the Close button on the Channel Setup window (Figure 32 on page 59) to close this window. 17 The Cable and Probe calibration is complete. 18 Read the NOTE below. 66 DVI Compliance Testing Methods of Implementation

67 Calibrating the Digital Storage Oscilloscope A NOTE Each cable is now calibrated for the oscilloscope channel it is connected to. Do not switch cables between channels or other oscilloscopes, or it will be necessary to calibrate them again. It is recommended that the cables be labeled with the channel they were calibrated for. Channel-to-Channel De-skew This procedure ensures that the timing skew errors between channel 1 and channel 3 are minimized. Perform the following steps: 1 Referring to Figure 43 below, perform the following steps: a b c d e f Do not disconnect the RG- 316 cables from either the Channel 1 or Channel 3 SMA adapters. If not already installed, install the non- Agilent SMA adapter on the oscilloscope Aux Out. Disconnect any cable connected to the SMA adapter on the Aux Out. Locate and connect the middle branch of the SMA Tee to the SMA adapter on the Aux Out BNC. Connect the far end of the cable from the Channel 1 SMA adapter, to one branch of the SMA Tee on the Aux Out. Connect the far end of the cable from the Channel 3 SMA adapter, to the other branch of the SMA Tee on the Aux Out. DVI Compliance Testing Methods of Implementation 67

68 A Calibrating the Digital Storage Oscilloscope SMA Tee on Aux Out Channel 1 Channel 3 Figure 43 De-skew Connection. 2 Referring to Figure 44 below, perform the following steps: a b c d Select the File>Load>Setup menu to open the Load Setup window. Navigate to the directory location that contains the INF_SMA_Deskew.set setup file. If the setup file is not available, it can be created by following the instructions in Appendix B, INF_SMA_Deskew.set Setup File Details. Select the INF_SMA_Deskew.set setup file by clicking on it. Click the Load button to configure the oscilloscope from this setup file. 68 DVI Compliance Testing Methods of Implementation

69 Calibrating the Digital Storage Oscilloscope A 1. Click File Load Setup 2. Then find and select INF_SMA_Deskew.set 3. Then click here to load setup file. Figure 44 Load De-skew Setup. The oscilloscope display should look similar to Figure 45 below. A falling edge of the square wave is shown in a 200 ps/div horizontal scale. The upper portion of the screen shows channel 1 (yellow trace) and channel 3 (purple trace) superimposed on one another. The lower portion of the screen is the differential signal (green trace) of channel 1 minus channel 3. The top two traces provide for visual inspection of relative time skew between the two channels. The bottom trace provides for visual presentation of unwanted differential mode signal resulted from relative channel skew (and to a much lesser extent from other inevitable channel mismatch parameters like gain and non- linearity). Figure 45 is an example of exaggerated skew between channel 1 and channel 3, measured to be about 50 ps with the cursor. DVI Compliance Testing Methods of Implementation 69

70 A Calibrating the Digital Storage Oscilloscope Skew between Channel 1 and Channel 3 Differential signal not flat, indicating mismatch in skew. Figure 45 Channel Skew. Figure 46 below shows the desired effect of no skew between the cables. Note that the channel 1 (yellow trace), channel 3 (purple trace) traces overlap, and the differential signal (green trace) is flat. If this is not the case, then perform the following steps to reduce the skew between channels 1 and DVI Compliance Testing Methods of Implementation

71 Calibrating the Digital Storage Oscilloscope A Channel 1 and 3 traces overlap, indicating no skew error. Flat differential signal, indicating no skew error. Figure 46 Skew Minimized. 3 Referring to Figure 47, perform the following steps to de- skew the channels: a Click on the Setup>Channel 1 menu to open the Channel Setup window. b c d e f g Move the Channel Setup window to the left so you can see the traces. Adjust the Skew by clicking on the < or > arrows, to achieve the flattest response on the differential signal (green trace). Click the Close button on the Channel Setup window to close it. The de- skew operation is complete. Disconnect the cables from the Tee on the Aux Out BNC. Leave the cables connected to the Channel 1 and Channel 3 inputs. Read the NOTE below. DVI Compliance Testing Methods of Implementation 71

72 A Calibrating the Digital Storage Oscilloscope Click Setup Channel 1 to open the Channel Setup window. Then adjust the Skew left or right to maximize flatness of green trace. Then click Close when done. Figure 47 De-skewing Procedure. NOTE Each cable is now calibrated for the oscilloscope channel it is connected to. Do not switch cables between channels or other oscilloscopes, or it will be necessary to calibrate them again. It is recommended that the cables be labeled with the channel they were calibrated for. 72 DVI Compliance Testing Methods of Implementation

73 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation B INF_SMA_Deskew.set Setup File Details If the INF_SMA_Deskew.set file is not available, you can create it by following these instructions. 1 Start from a default setup by pressing the Default Setup key on the front panel. Then configure the following settings: Acquisition Channel 1 Channel 3 Time base Trigger Averaging on number of averages 16 Interpolation on Scale mv/ Offset 350mV Coupling DC Impedance 50 Ohms Turn Channel On; Scale mv/ Offset 350m V Coupling DC Impedance 50 Ohms Scale 200 ps/sec Trigger level 173mV Slope falling Function 2 Turn on and configure for channel 1 subtract channel 3, Vertical scale 50 mv/ Offset mv Agilent Technologies 73

74 B INF_SMA_Deskew.set Setup File Details 74 DVI Compliance Testing Methods of Implementation

75 N5394A DVI Electrical Performance Validation and Compliance Software Compliance Testing Methods of Implementation C InfiniiMax Probing Figure A InfiniiMax Probe Amplifier Agilent recommends either the E2678A differential socket probe head. Figure 49 Table 6 Recommended Probe Head for the DVI Testing Probe Head Characteristics Probe Head Model Number Differential Measurement (BW, input C, input R) Single-Ended Measurement (BW, input C, input R) Differential socket E2678A 7 GHz, 0.34 pf, 50 kohm 7 GHz, 0.56 pf, 25 kohm Agilent Technologies 75