QPHY-DisplayPort
DisplayPort Serial Data
Operator’s Manual
Revision A – November, 2008
Relating to the Following Release Versions:
• Software Option Rev. 5.7
• DisplayPort Script Rev. 1.1
• Style Sheet Rev. 1.2
LeCroy Corporation
700 Chestnut Ridge Road
Chestnut Ridge, NY 10977–6499
Tel: (845) 578 6020, Fax: (845) 578 5985
Internet: www.lecroy.com
© 2008 by LeCroy Corporation. All rights reserved.
LeCroy, ActiveDSO, WaveLink, JitterTrack, WavePro, WaveMaster, WaveSurfer, WaveExpert, WaveRunner and
WaveJet are registered trademarks of LeCroy Corporation. Other product or brand names are trademarks or
requested trademarks of their respective holders. Information in this publication supersedes all earlier versions.
Specifications subject to change without notice.
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Visit www.lecroy.com to view the
certificate.
Document Number: 916466 Rev A
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For more information about proper
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TABLE OF CONTENTS
INTRODUCTION TO QUALIPHY DISPLAYPORT .................................................................... 6
Required equipment ................................................................................................................................................... 6
DisplayPort Compliance Test Fixtures ....................................................................................................................... 6
USING QUALIPHY DISPLAYPORT .......................................................................................... 6
QUALIPHY COMPLIANCE TEST PLATFORM ......................................................................... 7
Oscilloscope Option Key Installation .......................................................................................................................... 9
Typical (Recommended) Configuration ...................................................................................................................... 9
Remote (Network) Configuration ............................................................................................................................... 9
Oscilloscope Selection ............................................................................................................................................... 9
Accessing the QPHY-DisplayPort Software using QualiPHY .................................................................................. 10
Customizing QualiPHY ............................................................................................................................................. 12
QPHY-DisplayPort Operation ................................................................................................................................... 14
DISPLAYPORT MEASUREMENT PREPARATION ................................................................ 15
QPHY-DISPLAYPORT TEST CONFIGURATIONS ................................................................. 15
All Tests for Compliance (Lane0) ............................................................................................................................. 15
All Tests, High Bit Rate, SSC ................................................................................................................................... 15
All Tests, Reduced Bit Rate, SSC ............................................................................................................................ 15
Demo Mode, High Bit Rate, No SSC ....................................................................................................................... 15
Empty Template........................................................................................................................................................ 15
QPHY-DISPLAYPORT VARIABLES ....................................................................................... 16
Test Mode ......................................................................................................................................................... 16
Bitrate(s) to Use for Test ................................................................................................................................... 16
Lane Under Test ............................................................................................................................................... 16
SSC ................................................................................................................................................................... 16
3.1 Eye Diagram Testing .......................................................................................................................................... 16
Output Level to Test.......................................................................................................................................... 16
Pre-emphasis Level to Test .............................................................................................................................. 16
3.3 Pre-Emphasis Level Verification Testing ............................................................................................................ 16
Output Level to Test.......................................................................................................................................... 16
3.4 Inter-Pair Skew Test ........................................................................................................................................... 16
Second Lane Under Test .................................................................................................................................. 16
Output Level to Test.......................................................................................................................................... 16
Only Test At Highest Bit Rate ........................................................................................................................... 16
3.5 Intra-Pair Skew Test ........................................................................................................................................... 16
Output Level to Test.......................................................................................................................................... 16
Only Test at Highest Bit Rate ........................................................................................................................... 17
3.10 AC Common Mode Noise ................................................................................................................................ 17
Output Level to Test.......................................................................................................................................... 17
Pre-emphasis Level to Test .............................................................................................................................. 17
3.11 & 3.12 Non-ISI and Total Jitter Measurements ................................................................................................ 17
Output Level to Test.......................................................................................................................................... 17
Pre-emphasis Level to Test .............................................................................................................................. 17
3.14-3.16 Spread Spectrum Tests ............................................................................................................................ 17
Output Level to Test.......................................................................................................................................... 17
QPHY-DISPLAYPORT LIMIT SETS ........................................................................................ 17
QPHY-DISPLAYPORT TESTS ................................................................................................ 18
3.1 Eye Diagram Testing .......................................................................................................................................... 18
3.2 Non Pre-Emphasis Level Verification Testing .................................................................................................... 18
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3.3 Pre-Emphasis Level Verification Testing ............................................................................................................ 18
3.4 Inter-Pair Skew Test ........................................................................................................................................... 18
3.5 Intra-Pair Skew Test ........................................................................................................................................... 19
3.10 AC Common Mode Noise................................................................................................................................. 19
3.11 Non-ISI Jitter Measurements ............................................................................................................................ 19
3.12 Total Jitter Measurements ................................................................................................................................ 19
3.14 Main Link Frequency Compliance .................................................................................................................... 19
3.15 Spread Spectrum Clock Modulation Frequency ............................................................................................... 19
3.16 Spread Spectrum Clock Modulation Deviation ................................................................................................. 19
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TABLE OF FIGURES
Figure 1. Report menu in QualiPHY General Setup .............................................................................................. 7
Figure 2. The Test Report includes a summary table with links to the detailed test results ............................ 8
Figure 3. QualiPHY main menu and compliance test Standard selection menu ............................................. 10
Figure 4. QualiPHY configuration selection menu ............................................................................................. 11
Figure 5. QualiPHY test item selection menu ...................................................................................................... 12
Figure 6. Variable Setup and Limits Manager windows ..................................................................................... 13
Figure 7. Start button ............................................................................................................................................. 14
Figure 8. Example of pop-up connection diagram and dialog box ................................................................... 14
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INTRODUCTION TO QUALIPHY DISPLAYPORT
QPHY-DisplayPort is an automated test package performing all of the normative real time oscilloscope tests for
sources in accordance with version 1.1 of the VESA DisplayPort PHY Compliance Test Specification. The
software can be run on LeCroy’s SDA 9000, SDA 11000 and SDA 13000 real time oscilloscopes.
Required equipment
• SDA 9000, SDA11000 or SDA13000 Oscilloscope
• 4 SMA Male to SMA Male cables
• 8 SMA 50 Ω Terminators
• DisplayPort Test Fixture (as follows)
DisplayPort Compliance Test Fixtures
LeCroy recommends using the Efficere ET-DP-TPA-P (plug test adapter) as well as 10 two inch GPPO-to-SMA
cables. This equipment is available from Efficere individually or as part of the ET-HDMI-TPA-S Test Adapter Set.
The recommended test fixture for DisplayPort compliance testing is the ET-DP-TPA-S from Efficere Technologies.
The ET-DP-TPA-S DisplayPort test adapter set provides a very high bandwidth, low noise evaluation vehicle that
enables high-performance characterization of source and sink devices as well as cabling. Single Data Rate (SDR)
DisplayPort v1.1 bandwidth requirements exceed 10.8 Gb/s, equivalent to a data transfer rate of 1080
Mbytes/second. This adapter test set will also support Double Data Rates (DDR) anticipated in the v2.0
specification.
Note: The above text was taken from the ET-DP-TPA-S datasheet that can be found at www.efficere.com
USING QUALIPHY DISPLAYPORT
QualiPHY DisplayPort guides the user, step-by-step, through each of the normative source tests described in
version 1.1 of the VESA DisplayPort PHY Compliance Test Specification. To do this, the user must setup a test
session.
Users choose the test configuration they wish to run. There are five pre-loaded test configurations. They are:
• All Tests for Compliance (Lane0)
• All Tests, High Bit Rate, SSC
• All Tests, Reduced Bit Rate, SSC
• Demo Mode, High Bit Rate, No SSC
• Empty Template
These pre-loaded configurations provide quick and easy ways to begin compliance testing. If the user does not
want to run any of these configurations, they can create their own custom configuration (see the following section
entitled Customizing QualiPHY for details). The Empty Template is a blank configuration meant to serve as an
easy way to create your own custom configuration.
The pre-loaded configurations are setup to run all of the compliance tests on Lane 0, with the second lane tested
against for Inter-Pair Skew set to Lane 1. If this is not what the user wants, the variables can be modified (see the
QPHY-DisplayPort Variables section of this manual).
The variables are pre-loaded with the standard settings for compliance testing; however, the user may choose to
create their own configuration with the variables set as desired.
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QUALIPHY COMPLIANCE TEST PLATFORM
QualiPHY is LeCroy’s compliance test framework which leads the user through the compliance tests. QualiPHY
displays connection diagrams to ensure tests run properly, automates the oscilloscope setup, and generates
complete, detailed reports.
The QualiPHY software application automates the test and report generation.
Figure 1. Report menu in QualiPHY General Setup
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See the QualiPHY Operator’s Manual for more information on how to use the QualiPHY framework.
Figure 2. The Test Report includes a summary table with links to the detailed test results
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Oscilloscope Option Key Installation
An option key must be purchased to enable the QPHY-DP option. Call LeCroy Customer Support to place an
order and receive the code.
Enter the key and enable the purchased option as follows:
1. From the oscilloscope menu select Utilities Utilities Setup...
2. Select the Options tab and click the Add Key button.
3. Enter the Key Code using the on-screen keyboard.
4. Restart the oscilloscope to activate the option after installation.
Typical (Recommended) Configuration
QualiPHY software can be executed from the oscilloscope or a host computer. The first step is to install QualiPHY.
Please refer to the QualiPHY Operator’s Manual for installation instructions.
LeCroy recommends running QualiPHY on an oscilloscope equipped with Dual Monitor Display capability (Option
DMD-1 for oscilloscopes where this is not standard). This allows the waveform and measurements to be shown
on the oscilloscope LCD display while the QualiPHY application and test results are displayed on a second
monitor.
By default, the oscilloscope appears as a local host when QualiPHY is executed in the oscilloscope. Follow the
steps under Oscilloscope Selection (as follows) and check that the IP address is 127.0.0.1.
Remote (Network) Configuration
It is also possible to install and run QualiPHY on a host computer, controlling the oscilloscope with a Network/LAN
Connection.
The oscilloscope must already be configured, and an IP address (fixed or network-assigned) must already be
established.
Oscilloscope Selection
Set up the oscilloscope using QualiPHY over a LAN (Local Area Network) by doing the following:
1. Make sure the host computer is connected to the same LAN as the oscilloscope. If unsure, contact your
system administrator.
2. From the oscilloscope menu, select Utilities Utilities Setup
3. Select the Remote tab.
4. Verify the oscilloscope has an IP address and the control is set to TCP/IP.
5. Run QualiPHY in the host computer and click the General Setup button.
6. Select the Connection tab.
7. Enter the IP address from step 4 (previous).
8. Click the Close button.
QualiPHY is now ready to control the oscilloscope.
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QualiPHY tests the oscilloscope connection after clicking the Start button. The system prompts you if there is a
connection problem. QualiPHY’s Scope Selector function can also be used to verify the connection. Please refer
to the QualiPHY Operator’s Manual for explanations on how to use Scope Selector and other QualiPHY
functions.
Accessing the QPHY-DisplayPort Software using QualiPHY
This topic provides a basic overview of QualiPHY’s capabilities. Please refer to the QualiPHY Operator’s Manual
for detailed information.
Access the QPHY-DisplayPort software using the following steps:
1. Wait for the oscilloscope to start and have its main application running.
2. Launch QualiPHY from the Analysis menu if installed on the oscilloscope or from the desktop icon if installed
on a host computer.
3. From the QualiPHY main window (as follows), select Standard, then DPORT from the pop-up menu (if not
already selected). If you check the Pause on Failure box (circled) QualiPHY prompts to retry the measure
whenever a test fails.
Figure 3. QualiPHY main menu and compliance test Standard selection menu
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4. Click the Configuration button in the QualiPHY main menu:
5. Select a configuration from the pop-up menu:
Figure 4. QualiPHY configuration selection menu
6. Click Start.
7. Follow the pop-up window prompts.
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Customizing QualiPHY
The predefined configurations in the Configuration screen cannot be modified. However, you can create your
own test configurations by copying one of the standard test configurations and making modifications. A description
of the test is also shown in the description field when selected.
Figure 5. QualiPHY test item selection menu
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Once a custom configuration is defined, script variables and the test limits can be changed by using the Variable
Setup and Limits Manager from the Edit/View Configuration window.
Figure 6. Variable Setup and Limits Manager windows
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QPHY-DisplayPort Operation
After pressing Start in the QualiPHY menu, the software instructs how to set up the test using pop-up connection
diagrams and dialog boxes.
Figure 7. Start button
Figure 8. Example of pop-up connection diagram and dialog box
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DISPLAYPORT MEASUREMENT PREPARATION
Before beginning any test or data acquisition, the oscilloscope must be warmed for at least 20 minutes.
Calibration is automatic under software control and no manual calibration is required.
This procedure should be run again if the temperature of the oscilloscope changes by more than a few degrees.
Note: The QPHY-DisplayPort script automates the process for deskewing 4 cables. The 4 channel deskew procedure automated by the script
is very similar to a 2 channel procedure except that the 3rd and 4th channel are also deskewed with the 1st channel as the reference channel.
QPHY-DISPLAYPORT TEST CONFIGURATIONS
Configurations also include variable settings and limit sets, not just test selections. See the QPHY-DisplayPort
Variables section for a description of each variable value and its respective default value.
All Tests for Compliance (Lane0)
This configuration runs all of the support compliance tests. All of the variables are set to default. The tests are run
for both the Reduced Bit Rate and the High Bit Rate.
All Tests, High Bit Rate, SSC
This configuration runs all of the support compliance tests. All variables are set to default except Bit Rate to Use
for Test(s), which is set to High Bit Rate.
All Tests, Reduced Bit Rate, SSC
This configuration runs all of the support compliance tests. All variables are set to default except Bit Rate to Use
for Test(s), which is set to Reduced Bit Rate.
Demo Mode, High Bit Rate, No SSC
This configuration runs a demonstration of all of the support compliance tests. All variables are set to default
except Bit Rate to Use for Test(s), which is set to High Bit Rate. Saved waveforms are used.
Empty Template
This configuration is intentionally left blank so it can easily be copied and configured to the user’s custom
configuration. All variables are set to their default settings.
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QPHY-DISPLAYPORT VARIABLES
Test Mode
Specify whether to Acquire New Data or Use Saved Data for testing. Default is Acquire New Data.
Bitrate(s) to Use for Test
Specify whether to test the device under test at 1.62 Gb/s, 2.7 Gb/s or Both. Default is Both.
Lane Under Test
Specify the lane for testing. The choices are Lane 0, Lane 1, Lane 2 or Lane 3. Default is Lane 0.
SSC
Specify the state of SSC when running test. The choices are Enabled, Disabled, Both. Default is Disabled (Note:
some devices do not allow SSC to be disabled).
3.1 Eye Diagram Testing
Output Level to Test
Specify which output level to use for the Eye Diagram test.
The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
Pre-emphasis Level to Test
Specify which pre-emphasis level to use for the Eye Diagram test.
The choices are: 0 – 0 dB, 1 – 3.5 dB, 2 – 6.0 dB or 3 – 9.5 dB or any combination. The default value is 0dB.
3.3 Pre-Emphasis Level Verification Testing
Output Level to Test
Specify which output level to use for the Pre-Emphasis Voltage test.
The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
3.4 Inter-Pair Skew Test
Second Lane Under Test
Specify which lane to use as the second lane in the Inter-Pair Skew test. The choices are Lane 0, Lane 1, Lane 2,
Lane 3 or All. Default is Lane 1.
Output Level to Test
Specify which output level to use for the Inter-Pair Skew test.
The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
Only Test At Highest Bit Rate
Specify whether to run the Inter-Pair Skew test on only the highest bit rate. The Compliance Test Specification
Rev. 1.1 only requires this test to be run at the highest bit rate; however, this option allows you to run this test at
both the High Bit Rate and the Reduced Bit Rate. This only applies when Bitrate(s) to Use For Test is set to
Both. Default is Yes.
3.5 Intra-Pair Skew Test
Output Level to Test
Specify which output level to use for the Intra-Pair Skew test.
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The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
Only Test at Highest Bit Rate
Specify whether to run the Intra-Pair Skew test on only the highest bit rate. The Compliance Test Specification
Rev. 1.1 only requires this test to be run at the highest bit rate, however this option allows you to run this test at
both the High Bit Rate and the Reduced Bit Rate. This only applies when Bitrate(s) to Use For Test is set to
Both. Default is Yes.
3.10 AC Common Mode Noise
Output Level to Test
Specify which output level to use for the AC Common Mode test.
The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
Pre-emphasis Level to Test
Specify which pre-emphasis level to use for the AC common mode test.
The choices are: 0 – 0 dB, 1 – 3.5 dB, 2 – 6.0 dB or 3 – 9.5 dB or any combination. The default value is 0dB.
3.11 & 3.12 Non-ISI and Total Jitter Measurements
Output Level to Test
Specify which output level to use for the Non-ISI and Total Jitter tests.
The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
Pre-emphasis Level to Test
Specify which pre-emphasis level to use for the Non-ISI and Total Jitter tests.
The choices are: 0 – 0 dB, 1 – 3.5 dB, 2 – 6.0 dB or 3 – 9.5 dB or any combination. The default value is 0dB.
3.14-3.16 Spread Spectrum Tests
This consists of Main Link Frequency (3.14), SSC Modulation Frequency (3.15) and SSC Modulation Deviation
(3.16).
Output Level to Test
Specify which output level to use for the Spread Spectrum tests.
The choices are: 0 – 400 mV, 1 – 600 mV, 2 – 800 mV or 3 – 1200 mV or any combination. For example, choose
“0, 1” to use 400 mV and 600 mV. The default value is 800mV.
QPHY-DISPLAYPORT LIMIT SETS
The limits in use by QPHY-DisplayPort are the ones specified by the VESA DisplayPort PHY Compliance Test
Specification Version 1.1.
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QPHY-DISPLAYPORT TESTS
For additional information about the tests supported by QPHY-DisplayPort please refer to the VESA DisplayPort
PHY Compliance Test Specification Version 1.1.
3.1 Eye Diagram Testing
This test creates an eye diagram from the input signal and tests it against a mask. The result reported is the
number of mask hits.
3.2 Non Pre-Emphasis Level Verification Testing
This test measures the peak to peak voltage level of the non pre-emphasis bits. The source device under test
should be outputting a PRBS7 pattern. The non pre-emphasis level measurement is defined with regard to
specific bits of the pattern and cannot be applied to other patterns such as the D10.2 pattern. For each nominal
output voltage level (400 mV, 600 mV, 800 mV and 1200 mV) the measured non-pre-emphasis peak to peak
voltage is reported for informational purposes. The compliance measures 1, 2, and 3 are ratios of the measure
peak to peak voltage at different levels as defined by the Compliance Test Specification, Rev 1.1.
3.3 Pre-Emphasis Level Verification Testing
This test measures the level of pre-emphasis seen in the input signal. The source device under test should be
outputting a PRBS7 pattern. The pre-emphasis level measurement is defined as a ratio of peak to peak voltage of
the transition bits and the peak to peak voltage of the non-transition width. Therefore, as with Test 3.2, this
measurement cannot be applied to other patterns such as the D10.2 pattern. For each nominal level of preemphasis (0.0 dB, 3.5 dB, 6.0 dB and 9.5 dB) the peak to peak voltage for both the transition and non-transition
bits is reported for informational purposes. The level of pre-emphasis measured is also reported. In some cases,
the difference between two measured levels of pre-emphasis is also reported as specified in the Compliance Test
Specification, Rev. 1.1.
3.4 Inter-Pair Skew Test
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This test measures the skew between two lanes. The value reported is the actual skew measured minus the
nominal skew expected between the two lanes.
3.5 Intra-Pair Skew Test
This test measures the skew between D+ and D- of a single lane. The skew is measured at the 50% level of the
transition, as determined using the voltage level as defined in Test 3.2. Therefore, as with Test 3.2, this
measurement must be made using a PRBS7 pattern as the input signal and cannot be applied to other patterns,
such as the D10.2 pattern.
3.10 AC Common Mode Noise
This test measures the root mean square of the common mode voltage.
3.11 Non-ISI Jitter Measurements
This test measures the non-inter-symbol interference jitter. The result is reported in seconds and in unit intervals.
3.12 Total Jitter Measurements
This test measures the total jitter. The result is reported in seconds and in unit intervals.
3.14 Main Link Frequency Compliance
This test measures the mean operating frequency of the input signal. The result reported is the deviation from the
nominal frequency in parts per million.
3.15 Spread Spectrum Clock Modulation Frequency
This test measures the spread spectrum modulation frequency. This measurement only applies when spread
spectrum is enabled.
3.16 Spread Spectrum Clock Modulation Deviation
This test measures the range of frequency deviation due to spread spectrum. This measurement only applies
when spread spectrum is enabled. The result reported is the maximum deviation minus the minimum deviation
from the nominal frequency in parts per million.
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