Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort Calibration and Test Procedure Descriptions User Guide
Notices Keysight Technologies 2018 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 Keysight Technologies as governed by United States and international copyright laws. Manual Part Number N5990-91200 Edition Edition 3.0, May 2018 Keysight Technologies Deutschland GmbH Herrenberger Strasse 130, 71034 Böblingen, Germany Technology Licenses The hard ware 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. U.S. Government Rights The Software is commercial computer software, as defined by Federal Acquisition Regulation ( FAR ) 2.101. Pursuant to FAR 12.212 and 27.405-3 and Department of Defense FAR Supplement ( DFARS ) 227.7202, the U.S. government acquires commercial computer software under the same terms by which the software is customarily provided to the public. Accordingly, Keysight provides the Software to U.S. government customers under its standard commercial license, which is embodied in its End User License Agreement (EULA), a copy of which can be found at http://www.keysight.com/find/sweula. The license set forth in the EULA represents the exclusive authority by which the U.S. government may use, modify, distribute, or disclose the Software. The EULA and the license set forth therein, does not require or permit, among other things, that Keysight: (1) Furnish technical information related to commercial computer software or commercial computer software documentation that is not customarily provided to the public; or (2) Relinquish to, or otherwise provide, the government rights in excess of these rights customarily provided to the public to use, modify, reproduce, release, perform, display, or disclose commercial computer software or commercial computer software documentation. No additional government requirements beyond those set forth in the EULA shall apply, except to the extent that those terms, rights, or licenses are explicitly required from all providers of commercial computer software pursuant to the FAR and the DFARS and are set forth specifically in writing elsewhere in the EULA. Keysight shall be under no obligation to update, revise or otherwise modify the Software. With respect to any technical data as defined by FAR 2.101, pursuant to FAR 12.211 and 27.404.2 and DFARS 227.7102, the U.S. government acquires no greater than Limited Rights as defined in FAR 27.401 or DFAR 227.7103-5 (c), as applicable in any technical data. 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, KEYSIGHT 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. KEYSIGHT SHALL NOT BE LIABLE FOR ERRORS OR FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES IN CONNECTION WITH THE FURNISHING, USE, OR PERFORMANCE OF THIS DOCUMENT OR ANY INFORMATION CONTAINED HEREIN. SHOULD KEYSIGHT 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 WILL CONTROL. 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. 2 Keysight N5990A DisplayPort Extended Tests User Guide
Contents 1 Introduction 2 N5990A DisplayPort Station Configure DUT 8 3 Connection Diagrams Source Test Configuration 9 Calibration and Test proced ures 10 Connection Diagrams for Embedded DisplayPort 12 J-BERT N4903B Configuration 12 J-BERT M8020A Configuration 16 J-BERT N4903B and Switch Configuration 19 J-BERT M8020A and Switch Configuration 21 Switch Connections 22 4 Sink Calibration Procedures Calibration Overview 24 Embedded DisplayPort Sink Calibrations 25 ISI Calibration 25 Random Jitter Calibration 28 Fixed Sinusoidal Jitter Calibration 31 Eye Opening Calibration 34 Aggressor Amplitude Calibration 37 Keysight N5990A DisplayPort Extended Tests User Guide 3
Contents 5 Sink Test Procedures 6 Source Test Procedures Embedded DisplayPort Sink Tests 42 Jitter Tolerance Test 42 4 Keysight N5990A DisplayPort Extended Tests User Guide
Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort User Guide 1 Introduction The BitifEye ValiFrame Test Automation software is globally marketed and supported by Keysight Technologies (formerly Agilent Technologies) as N5990A. This document describes the calibrations and test procedures, conducted by the extension modules, for sink tests Embedded Display Port in detail. The software implements the compliance tests according to the requirements of the edp1.4 and DP 1.2b MOI (Method of Implementation) draft, and also offers some additional custom characterization tests to provide more details of the DUT (Device Under Test) behavior beyond the limits of compliance testing. NOTE Please regard, that edp is supplement to the standard ValiFrame-Display Port-Module. They only work in conjunction with a basic license for this.
Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort User Guide 2 N5990A DisplayPort Station Configure DUT / 8 Calibration and Test procedures / 10 Refer to the documentation of the Display Port Base Module N5990A for fundamental user instructions and software usage like installing, Station Configuration, supported instruments and so on.
2 N5990A DisplayPort Station Configure DUT After starting the DisplayPort program, you need to configure the DUT specifications. If you have licensed the modules edp (for embedded DisplayPort), you have additional options in the basic Configure Dialog (see, Figure 1 and Figure 2). Figure 1 Basic Configuration Parameters for Embedded DisplayPort Figure 2 Sink Basic Configuration Parameters (for Embedded DisplayPort) 8 Keysight N5990A DisplayPort Extended Tests User Guide
N5990A DisplayPort Station 2 Table 1 lists the additional options for edp modules. Table 1 Additional DUT Parameter List for extension modules Parameter name Parameter Description Products Parameter Product Type The product type can be chosen additionally as: edp Sink: Embedded displays. edp Source: Motherboards, ICs and Graphic Cards. CTS Version For edp, you can choose different parameter sets defined for your needs and derived from latest CTS edp 1.4 Source Test Configuration Source test license for edp is included in the standard DisplayPort source test license. For more information, refer to the basic DisplayPort manual. Keysight N5990A DisplayPort Extended Tests User Guide 9
2 N5990A DisplayPort Station Calibration and Test procedures The software suite offers a wide range of features for automated and reproducible tests. For the extended DisplayPort modules, they are the same as for basic DisplayPort module. To get all necessary informations about these common features, refer to chapter 3 Calibration and Test Procedures in the base manual. 10 Keysight N5990A DisplayPort Extended Tests User Guide
Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort User Guide 3 Connection Diagrams Connection Diagrams for Embedded DisplayPort / 12
3 Connection Diagrams Connection Diagrams for Embedded DisplayPort Use the required instrument list according to the MOI for DP1.2b for each configuration, because a MOI edp1.4 does not exist. The software only supports the pattern generators J-BERT N4903B and J-BERT M8020A, however, ParBERT isn t supported by edp. J-BERT N4903B Configuration Calibrations For calibrations using the J-BERT N4903B configuration, use the connection diagram as shown in Figure 3. Figure 3 Connection Diagram for edp J-BERT N4903B Calibrations 12 Keysight N5990A DisplayPort Extended Tests User Guide
Connection Diagrams 3 Instructions: Connect the J-BERT data output to the lane under test of the DisplayPort Plug fixture via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIGGER/REF CLK output to the 3-way power dividers (4-way if you selected them in the Product Configuration) via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the aggressor lanes of the DisplayPort Plug fixture. Connect the lane under test from the DisplayPort Receptacle fixture to the oscilloscope according to the selected way: with Differential Probe (connected to CH1) or directly with SMA connections (connected to CH1 and CH3). Connect CH4 of the oscilloscope to the clock output CLK of the J-BERT. Connect a 50 Ω termination to the negative clock output. Connect 50 Ω terminations to the aggressor lanes of the DisplayPort Receptacle fixture. Aggressor Amplitude Calibration For Aggressor Amplitude Calibration using the J-BERT N4903B configuration, use the connection diagram as shown in Figure 4. Figure 4 Connection Diagram for edp J-BERT N4903B Aggressor Amplitude Calibration Keysight N5990A DisplayPort Extended Tests User Guide 13
3 Connection Diagrams Instructions Connect the J-BERT data output to the lane under test of the DisplayPort Plug fixture via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIGGER/REF CLK output to the 3-way power dividers (4-way if you selected them in the Product Configuration) via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the aggressor lanes of the DisplayPort Plug fixture. Connect one of the aggressor lanes (any lane other than the lane under test) from the DisplayPort Receptacle fixture to the oscilloscope in the following way depending on the selection of scope connection type: Differential Probe should be connected to CH1of the oscilloscope. Direct SMA connections should be connected to CH1 and CH3 of the oscilloscope. Connect CH4 of the oscilloscope to the clock output CLK of the J-BERT. Connect a 50 Ω termination to the negative clock output. Connect a 50 Ω terminations to the aggressor lanes of the DisplayPort Receptacle fixture. Sink Tests For Sink tests using the J-BERT N4903B configuration, use the connection diagram as shown in Figure 5. 14 Keysight N5990A DisplayPort Extended Tests User Guide
Connection Diagrams 3 Figure 5 Connection Diagram for edp J-BERT N4903B Sink Tests Instructions Connect the J-BERT data output to the lane under test of the DisplayPort Plug fixture via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIGGER/REF CLK output to the 3-way power dividers (4-way if you selected them in the Product Configuration) via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the aggressor lanes of the DisplayPort Plug fixture. Connect the AUX Controller to the DisplayPort Plug fixture. Connect the DisplayPort Plug fixture to the DUT. Keysight N5990A DisplayPort Extended Tests User Guide 15
3 Connection Diagrams J-BERT M8020A Configuration Calibrations For calibrations using the J-BERT M8020A configuration, use the connection diagram as shown in Figure 6. Figure 6 Connection Diagram for edp J-BERT M8020A Calibrations Instructions Connect the J-BERT data output to the lane under test of the DisplayPort Plug fixture via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIG output to the 3-way power dividers via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the aggressor lanes of the DisplayPort Plug fixture. Connect the lane under test from the DisplayPort Receptacle fixture to the oscilloscope in the following way depending on the election of scope connection type: Differential Probe should be connected to CH1of the oscilloscope SMA connections should be connected to CH1 and CH3 of the oscilloscope Connect CH4 of the oscilloscope to the clock output CLK of the J-BERT. Connect a 50 Ω termination to the negative clock output. Connect a 50 Ω terminations to the aggressor lanes of the DisplayPort Receptacle fixture. 16 Keysight N5990A DisplayPort Extended Tests User Guide
Connection Diagrams 3 Aggressor Amplitude Calibration For Aggressor Amplitude Calibration using the J-BERT M8020A configuration, use the connection diagram as shown in Figure 7. Figure 7 Connection Diagram for edp J-BERT M8020A Aggressor Amplitude Calibration Instructions Connect the J-BERT data output to the lane under test of the DisplayPort Plug fixture via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIG output to the 3-way power dividers via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the aggressor lanes of the DisplayPort Plug fixture. Connect one of the aggressor lanes (any lane other than the lane under test) from the DisplayPort Receptacle fixture to the oscilloscope in the following way depending on the election of scope connection type: Differential Probe should be connected to CH1of the oscilloscope Direct SMA connections should be connected to CH1 and CH3 of the oscilloscope. Connect CH4 of the oscilloscope to the clock output CLK of the J-BERT. Connect a 50 Ω termination to the negative clock output. Connect a 50 Ω terminations to the aggressor lanes of the DisplayPort Receptacle fixture. Keysight N5990A DisplayPort Extended Tests User Guide 17
3 Connection Diagrams Sink Tests For Sink tests using the J-BERT M8020A configuration, use the connection diagram as shown in Figure 8. Figure 8 Connection Diagram for edp J-BERT M8020A Sink Tests Instructions Connect the J-BERT data output to the lane under test of the DisplayPort Plug fixture via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIG output to the 3-way power dividers via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the aggressor lanes of the DisplayPort Plug fixture. Connect the AUX Controller to the DisplayPort Plug fixture. Connect the DisplayPort Plug fixture to the DUT. 18 Keysight N5990A DisplayPort Extended Tests User Guide
Connection Diagrams 3 J-BERT N4903B and Switch Configuration Calibration For calibrations using the J-BERT N4903B and switch configuration, use the connection diagram as shown in Figure 9. Figure 9 Connection Diagram for edp J-BERT N4903B and Switch Calibrations Instructions Connect the J-BERT data output to the switch, according to the detailed switch connections, via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIGGER/REF CLK output to the 3-way power dividers (4-way if you selected them in the Product Configuration) via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the switch according to the detailed switch connections. Connect the switch outputs to the DisplayPort Plug fixture. Connect the lane under test from the DisplayPort Receptacle fixture to the oscilloscope in the following way depending on the selection of scope connection type: Differential Probe should be connected to CH1of the oscilloscope. Direct SMA connections should be connected to CH1 and CH3 of the oscilloscope. Connect CH4 of the oscilloscope to the clock output CLK of the J-BERT. Connect a 50 Ω termination to the negative clock output. Keysight N5990A DisplayPort Extended Tests User Guide 19
3 Connection Diagrams Connect 50 Ω terminations to the aggressor lanes of the DisplayPort Receptacle fixture. Sink Tests For Sink tests using the J-BERT N4903B and switch configuration, use the connection diagram as shown in Figure 10. Figure 10 Connection Diagram for edp J-BERT N4903B and Switch Sink Tests Instructions Connect the J-BERT data output to the to the switch, according to the detailed switch connections, (refer to section Switch Connections on page 22) via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIGGER/REF CLK output to the 3-way power dividers (4-way if you selected them in the Product Configuration) via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the switch according to the detailed switch connections. Connect the switch outputs to the DisplayPort Plug fixture. Connect the AUX Controller to the DisplayPort Plug fixture. Connect the DisplayPort Plug fixture to the DUT. 20 Keysight N5990A DisplayPort Extended Tests User Guide
Connection Diagrams 3 J-BERT M8020A and Switch Configuration Calibrations For calibrations using the J-BERT M8020A and switch configuration, use the connection diagram as shown in Figure 11. Figure 11 Connection Diagram for edp J-BERT M8020A and Switch Calibrations Instructions Connect the J-BERT data output to the switch, according to the detailed switch connections, via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIG output to the 3-way power dividers via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the switch according to the detailed switch connections. Connect the switch outputs to the DisplayPort Plug fixture. Connect the lane under test from the DisplayPort Receptacle fixture to the oscilloscope in the following way depending on the election of scope connection type: Differential Probe should be connected to CH1of the oscilloscope Direct SMA connections should be connected to CH1 and CH3 of the oscilloscope Connect CH4 of the oscilloscope to the clock output CLK of the J-BERT. Connect a 50 Ω termination to the negative clock output. Connect 50 Ω terminations to the aggressor lanes of the DisplayPort Receptacle fixture. Keysight N5990A DisplayPort Extended Tests User Guide 21
3 Connection Diagrams Sink Tests For Sink tests using the J-BERT M8020A and switch configuration, use the connection diagram as shown in Figure 12. Figure 12 Connection Diagram for edp J-BERT M8020A and Switch Sink Tests Instructions Connect the J-BERT data output to the switch, according to the detailed switch connections, via blocking capacitors and 60 ps TTCs. Connect the J-BERT TRIG output to the 3-way power dividers via blocking capacitors and 150 ps TTCs. Connect the power divider outputs to the switch according to the detailed switch connections. Connect the switch outputs to the DisplayPort Plug fixture. Connect the AUX Controller to the DisplayPort Plug fixture. Connect the DisplayPort Plug fixture to the DUT. Switch Connections The switch connection diagram for edp, is the same as that for standard DisplayPort. So, refer to the base documentation for DisplayPort Valiframe Software, to get the necessary informations about setting up the switch and the connections to the instruments. 22 Keysight N5990A DisplayPort Extended Tests User Guide
Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort User Guide 4 Sink Calibration Procedures Calibration Overview / 24 Embedded DisplayPort Sink Calibrations / 25 To get reliable results during automated tests of a DUT, first the instrument setup needs to be calibrated.
4 Sink Calibration Procedures Calibration Overview For principles and basic parameters of the calibration procedures, refer to the base manual of DisplayPort Valiframe Software. 24 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Embedded DisplayPort Sink Calibrations The Calibration procedures for edp is different. This section contains the set of calibrations required for the edp Sink test procedures. The calibrations are organized in groups depending on the following data rate: Reduced Bit rate (1.62 Gbps) Rate_2 (2.16 Gbps) Rate_3 (2.43 Gbps) High Bit rate (2.7 Gbps) Rate_5 (3.24 Gbps) Rate_6 (4.32 Gbps) High Bit rate 2 (5.4 Gbps) ISI Calibration Purpose Procedure Connection Diagram This procedure is used to calibrate the ISI. There is a separate calibration for each supported data rate. For this purpose, either the EzJit+ application or the Histogram on the real-time scope can be used. All jitter components are disabled and the HBR2 Compliance Pattern (CP2520) is set for every data rate. There is no ISI generator, so the ISI value is just measured and averaged over a number of cycles. To get the ISI value, DDJ(p-p) is measured with EzJit+ or the histograms are used to measure TJ. This calibration always passes because there is no target ISI value. Follow the pictures of the Connection Diagrams section (Chapter 4, Sink Calibration Procedures) depending on your configuration. Keysight N5990A DisplayPort Extended Tests User Guide 25
4 Sink Calibration Procedures Parameters Dependencies Results The parameters used in expert mode for this calibration are: Calibration Oscilloscope Bandwidth Measured ISI with histogram Measured Depth Measurement Cycles Pattern Sequence File Aggressor Clock Divider Pattern Period Length Pattern Period Length Auto Detect PLL Loop Bandwidth Damping Factor Voltages Differential Voltage These parameters are described in the Table 5-1: Sink Calibration Parameters in the base manual of DisplayPort Valiframe Software. No calibrations are required for this method. An example of HTML viewer for the ISI Calibration procedure is shown in Figure 13. The results comprise: The common parameter list (in expert mode) A calibration data table for the ISI that is being calibrated (see Table 2) 26 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Figure 13 Example of HTML Viewer for edp ISI Calibration Table 2 Data Table for edp ISI Calibration Parameter name Result Measured ISI Parameter Description This calibration always passes. The averaged value of the ISI measurements. Keysight N5990A DisplayPort Extended Tests User Guide 27
4 Sink Calibration Procedures Random Jitter Calibration Purpose Procedure Connection Diagram Parameters This calibration calibrates the random jitter (RJ). There is a separate calibration for each supported data rate. For this purpose the EzJit+ application running on the real-time scope is used. The test automation starts by applying small RJ amplitudes and increases them. For every set RJ value, the corresponding amplitude is measured and averaged over a number of cycles. Follow the pictures of the Connection Diagrams section (Chapter 4, Sink Calibration Procedures) depending on your configuration. The parameters used in expert mode for this calibration are: Calibration Oscilloscope Bandwidth Measurement Cycles Jitter Use Explicit Clock Stop Jitter Jitter Step Count Pattern Sequence File Aggressor Clock Divider Pattern Period Length Pattern Period Length Auto Detect Voltages Differential Voltage These parameters are described in the Table 5-1: Sink Calibration Parameters in the base manual of DisplayPort Valiframe Software. 28 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Dependencies Results The calibrations required for this method is: ISI Calibration An example of HTML viewer for the Random Jitter Calibration procedure is shown in Figure 14. The results comprise: A calibration data graph The common parameter list (in expert mode) A calibration data table for the Random Jitter that is being calibrated (see Table 3) Keysight N5990A DisplayPort Extended Tests User Guide 29
4 Sink Calibration Procedures Figure 14 Random Jitter Calibration 30 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Table 3 Data Table for edp Random Jitter Calibration Parameter name Set Jitter Actual Jitter Parameter Description The applied random jitter value. The measured random jitter value. Fixed Sinusoidal Jitter Calibration Purpose Procedure Connection Diagram Parameters This calibration calibrates the fixed sinusoidal jitter (SJFIXED), which consists of sinusoidal jitter of 200 MHz frequency. There is a separate calibration for each supported data rate. For this purpose the EzJit+ application running on the real-time scope is used. The test automation starts with small SJ amplitudes and increases and measures them for each set amplitude. It is averaged over a number of cycles. Follow the pictures of the Connection Diagrams section (Chapter 4, Sink Calibration Procedures) depending on your configuration. The parameters used in expert mode for this calibration are: Calibration Oscilloscope Bandwidth Measurement Cycles Jitter Use Explicit Clock Stop Jitter Jitter Step Count Pattern Sequence File Aggressor Clock Divider Keysight N5990A DisplayPort Extended Tests User Guide 31
4 Sink Calibration Procedures Dependencies Pattern Period Length Pattern Period Length Auto Detect Voltages Differential Voltage These parameters are described in the Table 5-1: Sink Calibration Parameters in the base manual of DisplayPort Valiframe Software. The calibration required for this method is: ISI Calibration Results An example of HTML viewer for the Fixed Sinusoidal Jitter Calibration procedure is shown in Figure 15. The results comprise: A calibration data graph The common parameter list (in expert mode) A calibration data table for the Sinusoidal Jitter that is being calibrated (see Table 4) 32 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Figure 15 edp Fixed Sinusoidal Jitter Calibration Keysight N5990A DisplayPort Extended Tests User Guide 33
4 Sink Calibration Procedures Table 4 Data Table for edp Fixed Sinusoidal Jitter Calibration Parameter name Set Jitter Actual Jitter Parameter Description The applied random jitter value. The measured random jitter value. Eye Opening Calibration Purpose Procedure Connection Diagram Parameters This calibration calibrates the eye opening at TP3_EQ. There is a separate calibration for each supported data rate. It starts with large amplitude and all the jitter impairments (RJ, SSC, SJFIXED, and SJSWEEP) are applied to the data signal. Aggressor signals are not considered for this calibration. The scope is configured to show the real-time eye. The test automation uses the location between 37.5% and 62.5% of the horizontal UI, where the eye opening is maximum, for measurement. After that, the generator output voltage is decreased and the same measurement is repeated. This allows an amplitude range to be calibrated. The eye opening is measured and averaged over a number of cycles. Follow the pictures of the Connection Diagrams section (Chapter 4, Sink Calibration Procedures) depending on your configuration. The parameters used in expert mode for this calibration are: Calibration Oscilloscope Bandwidth Memory Depth Measurement Cycles Jitter RJ Amplitude (RMS) 34 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Dependencies Results Fixed SJ Amplitude Fixed SJ Frequency SJ Frequency Pattern Sequence File Aggressor Clock Divider PLL Loop Bandwidth Damping Factor Voltages First Differential Voltage Minimum Eye Opening Applied Voltage Step These parameters are described in the Table 5-1: Sink Calibration Parameters in the base manual of DisplayPort Valiframe Software. The calibrations required for this method are: ISI Calibration RJ Jitter Calibration High Speed Sinusoidal Jitter Calibration Fixed Sinusoidal Jitter Calibration An example of HTML viewer for the Eye Opening Calibration procedure is shown in Figure 16. The results comprise: A calibration data graph The common parameter list (in expert mode) A calibration data table for the Eye that is being calibrated (see Table 5) Keysight N5990A DisplayPort Extended Tests User Guide 35
4 Sink Calibration Procedures Figure 16 Example HTML Viewer for edp Eye Opening Calibration 36 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Table 5 Data Table for edp Eye Opening Calibration Parameter name Set Voltage Measured Voltage Parameter Description The generator set output voltage. Measured eye opening with the scope Aggressor Amplitude Calibration Purpose This calibration calibrates the differential output voltage of the aggressor signal. There is a separate calibration for each supported data rate. Procedure The test automation starts by applying a high differential voltage and decreases it in each step. The corresponding aggressor signal amplitude is measured on the scope. Connection Diagram Follow the pictures of the Connection Diagrams section (Chapter 4, Sink Calibration Procedures) depending on your configuration. Parameters The parameters used in expert mode for this calibration are: Calibration Oscilloscope Bandwidth Memory Depth Measurement Cycles Pattern Sequence File Keysight N5990A DisplayPort Extended Tests User Guide 37
4 Sink Calibration Procedures Dependencies Results Aggressor Clock Divider Voltages First Differential Voltage Minimum Eye Opening Applied Voltage Step These parameters are described in the Table 5-1: Sink Calibration Parameters in the base manual of DisplayPort Valiframe Software. No calibrations are required for this method. An example of HTML viewer for the Aggressor Amplitude Calibration procedure is shown in Figure 17. The results comprise: A calibration data graph The common parameter list (in expert mode) A calibration data table for the Aggressor Amplitude that is being calibrated (see Table 6). 38 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Calibration Procedures 4 Figure 17 edp Aggressor Amplitude Calibration Keysight N5990A DisplayPort Extended Tests User Guide 39
4 Sink Calibration Procedures Table 6 Data Table for edp Aggressor Amplitude Calibration Parameter name Set Voltage Measured Voltage Parameter Description Set Clock Generator output voltage. Measured aggressor signal voltage. 40 Keysight N5990A DisplayPort Extended Tests User Guide
Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort User Guide 5 Sink Test Procedures Embedded DisplayPort Sink Tests / 42 For basic informations about sink test procedures, refer to the main manual of DisplayPort module.
5 Sink Test Procedures Embedded DisplayPort Sink Tests The Sink tests for Embedded DisplayPort are implement according to the edp 1.4 CTS. The Sink test groups are divided by lane (1 4), and subdivided by supported data rate (Reduced Bit rate, Rate_2, Rate_3, High Bit rate, Rate_5, Rate_6, High Bit rate 2) and SJ Frequency (2.1, 9, 18 and 90 MHz). Jitter Tolerance Test Purpose Procedure Connection Diagram Parameters This test procedure is described in the edp 1.4 compliance test specification. It generates a stressed eye and verifies that the receiver sustains a BER of 10e 9. The test automation sets up the instrument with the calibrated amplitudes and jitter values required by the specification. First, it runs the link training, which is done in two steps: frequency and symbol lock phase. Afterward, the data pattern is applied (CP2520) and the error counter started. A count-down timer is displayed and, when it is finished, the result of the test is decided depending on the number of errors. Follow the pictures of the Connection Diagrams section ( Chapter 4, Sink Calibration Procedures) depending on your configuration. The parameters used in expert mode for this calibration are: Bit Error Rate Testing Link Quality Pattern Hint Allowed Number of Errors Observation Time DPCD Extra DPCD Extra DPCD Order Jitter 42 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Test Procedures 5 Dependencies RJ Amplitude (RMS) Fixed SJ Amplitude (pk pk) Fixed SJ Frequency SJ via Clock Jitter Pattern Sequence File Aggressor Clock Divider SSC Use SSC SSC Frequency SSC Amplitude Voltage Levels Tested lane voltage Aggressor Lane Voltage These parameters are described in the Table 6-1: Sink Calibration Parameters in the base manual of DisplayPort Valiframe Software. The calibrations required for this method are: ISI Calibration RJ Jitter Calibration Fixed Sinusoidal Jitter Calibration Eye Opening Calibration Aggressor Amplitude Calibration Results An example of HTML viewer for the Jitter Tolerance Test procedure is shown in Figure 18. The results comprise: The common parameter list (in expert mode). A data table for the Result (see Table 7). Keysight N5990A DisplayPort Extended Tests User Guide 43
5 Sink Test Procedures Figure 18 Example HTML Viewer for edp Jitter Tolerance Test Table 7 Data Table for edp Jitter Tolerance Test Parameter name Result Jitter Frequency Sinusoidal Jitter Amplitude Number of Errors Parameter Description Pass/Fail, pass means this test was passed. The frequency of the sinusoidal jitter injected during the test. The amplitude of the sinusoidal jitter injected during the test. The number of errors counted during the test. 44 Keysight N5990A DisplayPort Extended Tests User Guide
Sink Test Procedures 5 Parameter name Min Spec Max Spec Details Parameter Description The minimum allowed number of errors. The maximum allowed number of errors. Description of the possible problems found during the test. Keysight N5990A DisplayPort Extended Tests User Guide 45
Keysight N5990A DisplayPort Extended Tests Embedded DisplayPort User Guide 6 Source Test Procedures Source test procedures for edp are included in the basic license for DisplayPort Valiframe Software. The measurements are conducted by the Keysight oscilloscope application. For further informations about these test procedures, refer to the basic manual.
This information is subject to change without notice. Keysight Technologies 2018 Edition 3.0, May 2018 www.keysight.com