DisplayPort TX & RX Testing Solutions

DisplayPort TX & RX Testing Solutions

Agenda DP Technology Overview DPC TX Solution DPC RX Solution 2

DP Technology Overview 3

DisplayPort Standards Standards DP 1.2 May, 2012 DP over Type-C Spec Aug, 2015 DP 1.4 Spec Feb, 2016 Hot Plug Detect (HPD) signal line Initiates communication Main-Link Uncompressed video and audio Auxiliary channel (AUX CH) Link management and device control 4

Consortium Updates DP over Type-C Spec released on Aug 10, 2015 Draft CTS available Alternate Mode functional extension of the USB-C interface Developed in liaison with the USB 3.0 Promoter Group Crosstalk Eye and Jitter measurement (new) Effect of 2 x lanes USB and 2 x lanes DP Applies to sources that support HBR2 or higher data rates The PD controller needs to configure DUT to 2xDP/2xUSB 3 MAY 2018 5

Consortium Updates DP 1.4 Spec released on March 1 st 2016 Timelines of CTS release Q1 2017 Incorporates Display Stream Compression (DSC) technology for visually lossless transmission Supports display resolution support up to 5K x 3K at HBR3 (8.1Gbps) Supports Forward Error Correction (FEC) Addresses the transport error resiliency needed for compressed video transport to external displays HDR meta transport Useful for DP to HDMI 2.0a protocol conversion 3 MAY 2018 6

DP 1.4 vs DP 1.2 Comparison Test ID DP 1.2 DP 1.4 Highest Speed 5.4 Gbps (HBR2) 8.1 Gbps (HBR3) Recommended scope bandwidth 12.5 GHz 16 GHz (min 12.5 GHz) 3.1 Eye Diagram Test Test Point TP3_Eq TP3_Eq Pattern Comp Eye TPS4 CTLE Single Multiple, optimized CTLE + DFE setting to be used for measurement DFE No Yes Cable Model HBR2 Cable Model (s4p), ~17dB loss HBR3 Cable Model (s4p), ~11dB loss Eye Opening 90 mv 90 mv Maximum TX Total Jitter 0.62 UI 0.5 UI 7

DPC Tx Solutions 8

典型的串行总线测试位置 2018/5/39

Measurement Test Points TP1: at the pins of the transmitter device. TP2: at the test interface on a test access fixture near end TP3: at the test interface on a test access fixture far end TP3_EQ: TP3 with equalizer applied. TP4: at the pins of a receiving device NORMATIVE test points INFORMATIVE test points 3 MAY 2018 10

Measurement List Standard Tests: Eye Diagram Frequency Accuracy Rise/Fall time Unit Interval TJ/RJ Non ISI Jitter Multi-Lane Tests: Inter-pair Skew Intra-pair Skew Amplitude Tests: Non Pre-Emphasis Level Verification Pre-Emphasis Level Verification SSC Tests: Modulation Frequency Deviation and Variation Dual-Mode Tests: (If DUT supports) Clock Jitter Eye Diagram Aux Tests: Sensitivity Test Eye Diagram 3 MAY 2018 11

Testing Challenges Acquisition Bit Rates: RBR, HBR, HBR2 Patterns: D10.2,PRBS7, COMP, PLTPAT, PCTPAT Pre-Emphasis: 0dB, 3.5dB, 6dB, 9.5dB Output Levels: 400mV, 600mV, 800mV, 1200mV SSC (Spread Spectrum): On/Off Lane Width: 1,2,4 Test Waveforms (SSC, 4 Lanes Possible Combinations) Eye Diagram Test 80 Pre-Emphasis Test 240 Non-Pre-Emphasis 32 Total Jitter 80 ~432 Acquired signals for DP1.2 Normative Measurements per lane. X4 lanes results in 1728 Automated acquisitions per DUT 3 MAY 2018 12

Eye Diagram Eye Diagram is measured at TP3_EQ point Eye Diagrams generated for: Best case cable (Zero cable) Worst case cable Adaptive Mask Generation at HBR2 and HBR3 Width Along 0mV Height Passing location: 0.375 to 0.625UI 3 MAY 2018 13

Voltage Swing and Pre-Emphasis Non Pre-Emphasis test must measure a region after the signal is settled. (V-Diff) Pre-Emphasis test must measure the region where its being applied. (V-Diff-Pre) RBR/HBR PRBS7 pattern HBR2 PLTPAT (Pre-Emphasis Level Test Pattern) 3 MAY 2018 14

Type-C Solution Overview Type-C USB DP TBT Gen-1 (5G) DP Type-C TBT-2 Gen-2 (10G) DP 1.4 (HBR3) TBT-3 USB PD 3 MAY 2018 15

DisplayPort Mode (Alt mode) Unigraf DPR-100 (AUX Controller)

Why We Recommend DPR-100? Unigraf serves as a worldwide leader of DisplayPort compliance testing tools Working with all major companies in display industry Officially recommended by competitors KS and LeCroy (now Tek) Tools are certified for official compliance testing Their Compliance test tools Implement a set of tests specified in the DP standard Implementation certified by the VESA standard body Always updating their firmware to stay current in industry Capabilities DPR-100 DP-Aux DP Link Core CTS YES NO HDCP CTS YES NO Audio CTS YES NO PHY CTS (AUX Controller) YES YES R&D Debug GUI YES NO Test Automation YES NO 3 MAY 2018 18

Introducing DPR-100 Utility Comes bundled with TekExpress DP 1.4 installer Controls DPR-100 aux controller to change the DUT settings like data rates, patterns and levels Helps verify setup connections and DUT behaviors before running compliance tests Controls GRL Alt-mode controller as part of Type-C setup Competition does not offer this level of support 3 MAY 2018 19

Automating DisplayPort 1.4 TX Tests TEKEXPRESS DP1.4 UPDATES Execution mode : Live or pre-recorded CTS versions : DP1.4, DP 1.2 Connector Type Standard or Type-C DUT Settings DUT Automation Manual or DPR-100 Lane selection or switch matrix Optional Signal Validation 20

TekExpress Report Summary of runs Bathtub and histogram plot for TJ measurement Detailed images with histogram and bit stream data Dynamic mask generation with auto-fit mask hits 3 MAY 2018 21

Why Test Times Matter in DP Testing? Parameters Combinations Bit Rates RBR, HBR, HBR2, HBR3 Patterns D10.2, PRBS7, COMPEYE, PLTPAT Pre-Emphasis 0dB, 3.5dB, 6dB,9.5dB Levels 400mV, 600mV, 800mV, 1200mV Lane Width 1,2,4 SSC On (If DUT supports) Real world benchmarking HBR2 Test times > 11 hours Tektronix Results HBR2 Test times ~ 6 hours Test Waveforms Eye Diagram 88 Pre-Emphasis 320 Non-Pre-Emphasis 32 Total Jitter 112 ~126 acquired signals for DP1.4 Normative Measurements per lane. X4 lanes results in 504 automated acquisitions per DUT 22

Testing Beyond Compliance TekScope SDLA TekExpress DPOJET Basic signal analysis Rise/Fall Times Amplitude Frequency Advanced signal analysis Standard specific modules Perform statistical analysis Eye-diagram and histogram plots Detailed Reports Understand channel behavior Understand component change effects Virtual test point probing Open a closed eye Analyze up to 8 cascaded blocks Automated Compliance test application software Incorporates the latest MOIs Fast test execution times Elaborate reports with results and plots 23

Putting It All Together Browser tip of P7720 probe DisplayPort Sample Circuit Dock Use DPOJET plugins to quickly measure DP tests Processor Switch Re-Timer DP Connector DisplayPort fixture SMA adapter TekExpress DP application to perform compliance measurements Solder-in tip of P7720 probe Use SDLA to de-embed each test point along the signal trace P7720 probe 24

DP 1.4 and SDLA The HBR3 Reference Receiver Equalizer is modeled as a first-order CTLE cascaded with a one-tap Decision Feedback Equalizer (DFE). The HBR3 Reference equalizer includes a CTLE cascaded with a one-tap adaptive DFE with a feedback coefficient limited to < 50mV. The TekExpress automates the DFE operation by interacting with SDLA application. The DFE taps, Amplitude and Threshold values are reported under Eye diagram test. 3 MAY 2018 25

DPC Tx Test Setup 3 MAY 2018 TEKTRONIX DISPLAY SOLUTIONS 26

DPC Tx Instrument List > 16GHZ Scope with DJA, DP12(RBR/HBR/HBR2), DP14(add HBR3 supporting based on DP12) Wilder TEK-DPC-TPA-PCB (Plug & Control Board) P7720 + P77C292MM (Optional) 或 P7313SMA > 2 (Optional) 或 PMCABLE1M *2 DPR-100 with Software License DC Block *8 (Optional) P6247 For AUX Channel Testing 3 MAY 2018 TEKTRONIX DISPLAY SOLUTIONS 27

Standard DP Tx Instrument List > 16GHZ Scope with DJA, DP12(RBR/HBR/HBR2), DP14(add HBR3 supporting based on DP12) TF-DP-TPA-P Standard DP Plug Adapter DP-TPA-A DisplayPort Aux Control Adapter P7720 + P77C292MM (Optional) 或 P7313SMA > 2 (Optional) 或 PMCABLE1M *2 DPR-100 with Software License DC Block *8 (Optional) P6247 For AUX Channel Testing 3 MAY 2018 TEKTRONIX DISPLAY SOLUTIONS 28

DPC Rx Solutions 30

RX Test Challenges Calibration Frequency Range (SJ): 2MHz, 10MHz, 20MHz, 100MHz Injected Jitter: ISI, RJ and SJ TP3 for RBR and TP3_Eq for HBR/HBR2 Uni-direction without Loopback Link Training Frequency and Symbol lock Jitter Tolerance Testing 31

RX Test Procedure Step-1 : Calibration Step-2 : Sink Testing 32

Key Features VESA approved automated calibration and compliance testing solution 100% coverage as per DP PHY 1.2b CTS Automated DDJ (ISI) calibration & Jitter Margin testing at user-defined Jitter Frequency Steps Simple Setup, Test Execution, and Reporting in HTML and.csv formats Fully integrated with Unigraf DPT-200 controller Automates checking of DisplayPort Configuration Data (DPCD) registers for BER validation 33

DP 1.4 RX Configuration Stressed Signal Generator : BERTScope (BSX125 series) 70K series Oscilloscope DPO 71254C/DX (or above) with DPOJET option DJA GRL-DP-SINKSW compliance test software Unigraf DPT-200 Aux controller reference Source Variable ISI Generator - Artek CLE1000-A2 Wilder DP-TPA-PR fixtures (plug and receptacle) DP Sink accessories (refer configurator on Tek.com solutions page) 34

DP Solutions Portfolio 35

Tektronix DP Portfolio Electrical Protocol TekExpress DP 1.2 Type-C TekExpress DP 1.4 (HBR3) edp 1.4 TX DisplayPort Standards DisplayPort 1.4 DisplayPort Type-C Tx DP 1.2 Protocol decode DP 1.2 RX DP 1.4/Type-C RX RX Specification Roadmap Tektronix Latest Releases 3 MAY 2018 36

Info @ Tek.com http://www.tek.com/displayport-0 Webinars Application Notes Methods of Implementation Product & Software Datasheets Software Download Trials 3 MAY 2018 37 2017 01/20/2017 XXW-XXXXX-0

Q and A 3 MAY 2018 TEKTRONIX DISPLAY SOLUTIONS 38