Agilent Technologies DisplayPort Manuel d'utilisateur Page 1

DisplayPort Physical Layer Measurements Simple steps to follow for success!Brian FetzOctober 30th, 2012© Agilent Technologies 2012

October 29, 2012Confidentiality Label10Ch 1Maximize scale display, Trigger on Channel 1Measure 'tCh1-Ch2, 'tCh1-Ch3 , 'tCh1-Ch4Ch 2, 3

October 29, 2012Confidentiality Label11Ch3Ch1For Level:Trigger on pattern or pulse or edgeAverage modeMeasure Level… Vpeak to peakFor Jitter:Pattern

The Test Regimen will require control of your source device:• Bit Rate 1.62, 2.7, 5.4 Gbs• Level Settings 0, 1, 2, 3• Pre-Emphasis Settings 0, 1, 2, 3

Preparing for TestControl of your DisplayPort DeviceAgilent DisplayPort Test ApplicationSet up your device

Start at RBR (1.62Gbs) at Level setting 0 (400mV nominal) and PreEmphasis Setting 0 (0 dB nominal). D10.2 Pattern. Set Time scale to 616 ps per divisi

1Examining Level ControlEdge trigger on clock patternAverage. Set vertical to peak value at Level 0Examining PreEmphasis and Pattern ControlPulse widt

Examining Pattern ControlPreparing for TestVerifying Control of your DisplayPort device5.4Gbs pattern, Level 0(400mV nominal), PreEmphasis setting 0(0

Cables: low loss and phase matched.Test Point Adapter functions to consider: • Signal Access for high speed lanes • AUX Channel lane access for contro

October 29, 2012Confidentiality Label18Agilent: Standard: W2641BWilder:  Standard: DP-TPA-P Mini DP: Mini-DP-TPA-P eDP: eDP-TPA-PRC Aux channel

October 29, 2012Confidentiality Label19Preparing for TestCheck/Analyze your signalsDifferential signals. One is L0+the other is L0-They should be equa

TopicsOverview of DisplayPort Interface and Key points that affect testQuick Review of the Compliance ProcessPreparing for test: Validate/Check yo

DisplayPort TX Testing

DisplayPort TX TestingTwo Specifications in play at this time:Standard DisplayPorteDP 1.3New specs just released: (CTS in draft)eDP 1.4 MyDPDP / D

DisplayPort Tests and PatternsOctober 29, 2012Confidentiality Label22Test RBR HBR HBR23-1 Eye Diagram PRBS7 PRBS7/CP2520CP25203-2 Non PreEmphasis Leve

DisplayPort Tests and Levels&Pre-EmphasisOctober 29, 2012Confidentiality Label23Test Levels Pre-Emphasis3-1 Eye Diagram RBR/HBR: Setting 2HBR2: Us

Know that there are many test conditions!Eye Diagram:One Level, One P-E setting, 2 SSC states, 4 Lanes, 3 bit rates, two cable conditions for HBR2: 2*

Test Details: Screen Shots and DiscussionOctober 29, 2012Confidentiality Label25General Notes: 1. DP 1.2b testing does not change testing for RBR and

Test Details: Screen Shots and DiscussionEye Diagram Test:Notes:1. RBR/HBR have fixed Mask. 2. HBR2 mask to support BER of 10-9. It is a 4 point pol

Test Details: Screen Shots and DiscussionNon-Pre-emphasized Level TestNotes:1. The nominal settings of Level 0, 1, 2, 3 are 400, 600, 800, and 1200 mV

Test Details: Screen Shots and DiscussionOctober 29, 2012Confidentiality Label28Pre Emphasis TestsNotes:1. The nominal settings of Level 0, 1, 2, 3 ar

Test Details: Screen Shots and DiscussionSkewNotes:1. Adjacent Lanes are offset in time by 20 unit intervals.2. Requires a longish pattern for time co

Two InterfacesMain Link1, 2, or 4 differential lanes 3 possible bit rates (1.62Gbs, 2.7Gbs, 5.4Gbs) 4 possible level settings (400, 600, 800,1200mV

Test Details: Screen Shots and DiscussionFrequency/SSC TestsNotes:1. Evaluate Data Rate Trend, filter data with smoothing function2. Downspread Range

Test Details: Screen Shots and DiscussionJitter TestsNotes:1. RBR/HBR unchanged from DP 1.1a. Total Jitter and non-ISI Jitter.2. HBR2 with cable mo

Test Details: Measurement Screen Shots and DiscussionDual Mode TestsNotes:1. 4 lane DP device sends out HDMI content2. Is not biased (pulled up to 3.3

AUX Channel TestingOctober 29, 2012Confidentiality Label33Schematic

AUX Channel TestingOctober 29, 2012Confidentiality Label34Test Condition of Test8-1 AUX Channel Eye AUX Traffic8-2 AUX Sensitivity AUX Traffic8-3 AUX

AUX Channel TestingOctober 29, 2012Confidentiality Label35AUX Eye TestingAUX SensitivityAABBABBSource Initiation of AUX communicationReceiver Response

October 29, 2012Confidentiality Label36DisplayPort RX TestingNotes:1. Only one ‘test’: Stressed Receiver Test. The idea is to put in a worst case dat

October 29, 2012Confidentiality Label37DisplayPort RX TestingTable 4.4 from DisplayPort CTS 1.2bTo provide a stressed signal means: Set up a specifie

October 29, 2012Confidentiality Label38DisplayPort RX TestingDisplayPort Sink ComplianceTest software

Key Features• Built around the concept of Test Plans• 3 Test suites: DisplayPort Phy Layer, AUX channel, and Dual Mode.• Includes Test Selection cont

Review of DisplayPort InterfaceImplications for TestOctober 29, 2012Confidentiality Label4Testing Main LinkThere are hundreds of test conditions for

Test Plans• Device Test Plan• Connection Test Plan• Selected TestsSource Testing using DP Compliance SoftwareDevice DefinitionTest ConnectionTest Sel

Other Considerations• Add-In your own tests• Scripts for control• Remote clientSource Testing using DP Compliance SoftwareOr saveto .arsl fileand cal

SummaryTake control of your DisplayPort Testing efforts:Understand the key attributes of the DisplayPort specification that have significant implic

October 29, 2012Confidentiality Label43October 29, 2012Confidentiality Label43Additional Resourceswww.agilent.com/find/displayport• Agilent’s complete

DP Compliance Test ProcessOctober 29, 2012Confidentiality Label5VESA has a ‘Look for the Logo’ campaign to promote consumer confidence.Each product

Preparing for TestCheck your Physical Layer Test EquipmentOctober 29, 2012Confidentiality Label6OscilloscopeLevel AccuracyNoise and Residual Jitter

October 29, 2012Confidentiality Label7Power Meter- measures dBm: dB relative to 1mWConvert with relation: 0 dBm = 1 mW= Vrms2/50Vrms= sqrt (50*.001)

October 29, 2012Confidentiality Label8Measure Vrms in lowest scale and in the scale you will be making measurementsCh1 Ch2 Ch3 Ch45mV/div 438uV 431uV

October 29, 2012Confidentiality Label9Adjust output on signal generator to full scale on which you will be making measurementsExpected Jitter should