DisplayPort TX & RX Testing Solutions over... · Protocol TX RX DisplayPort 1.4 Electrical DP 1.2...
Transcript of DisplayPort TX & RX Testing Solutions over... · Protocol TX RX DisplayPort 1.4 Electrical DP 1.2...
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DisplayPort TX & RXTesting Solutions
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Agenda• DP Technology Overview
• DPC TX Solution
• DPC RX Solution
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DP Technology Overview
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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
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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
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Consortium Updates – DP 1.4
• Spec released on March 1st 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
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DP 1.4 vs DP 1.2 Comparison
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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 SingleMultiple, 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
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DPC Tx Solutions
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2018/5/39
典型的串行总线测试位置
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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
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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
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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
~432 Acquired signals for DP1.2 Normative Measurements per lane.
X4 lanes results in 1728 Automated acquisitions per DUT
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Test
Waveforms
(SSC, 4 Lanes Possible Combinations)
Eye Diagram Test 80
Pre-Emphasis Test 240
Non-Pre-Emphasis 32
Total Jitter 80
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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
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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)
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Type-C Solution Overview
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Type-C
USB
Gen-1 (5G)
Gen-2 (10G)
USB PD
DP TBT
DP Type-C
DP 1.4 (HBR3)
TBT-2
TBT-3
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DisplayPort Mode (Alt mode)
Unigraf DPR-100
(AUX Controller)
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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
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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
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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
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Automating DisplayPort 1.4 TX Tests
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Connector Type – Standard or Type-C
CTS versions : DP1.4, DP 1.2
Execution mode : Live or pre-recorded
DUT Settings
DUT Automation – Manual or DPR-100
Lane selection or switch matrix
Optional Signal Validation
TEKEXPRESS DP1.4 UPDATES
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TekExpress Report
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Summary of runs
Detailed images with histogram
and bit stream data
Bathtub and histogram plot
for TJ measurement
Dynamic mask generation
with auto-fit mask hits
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Why Test Times Matter in DP Testing?
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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
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 hoursTektronix Results
HBR2 Test times ~ 6 hours
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Testing Beyond Compliance
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TekScope SDLA TekExpressDPOJET
• 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
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Putting It All Together
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Processor Switch
Dock
DP
ConnectorRe-Timer
Use DPOJET plugins to quickly measure DP tests
Use SDLA to de-embed each test point along the signal trace
Solder-in tip of P7720 probe
Browser tip of P7720 probe
DisplayPort Sample Circuit
DisplayPort fixture TekExpress DP application to
perform compliance measurements
P7720 probe
SMA adapter
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DP 1.4 and SDLA
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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.
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DPC Tx Test Setup
3 MAY 2018 26TEKTRONIX DISPLAY SOLUTIONS
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DPC Tx Instrument List
3 MAY 2018 27TEKTRONIX DISPLAY SOLUTIONS
• > 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
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Standard DP Tx Instrument List
3 MAY 2018 28TEKTRONIX DISPLAY SOLUTIONS
• > 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
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DPC Rx Solutions
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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
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RX Test Procedure
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Step-1 : Calibration Step-2 : Sink Testing
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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
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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)
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DP Solutions Portfolio
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Tektronix DP Portfolio
3 MAY 2018 36
DisplayPort
Standards
Protocol
TX
RX
DisplayPort 1.4
Electrical
DP 1.2 RX
DP 1.2
Protocol
decode
Specification Roadmap Tektronix Latest Releases
TekExpress
DP 1.2 Type-C
TekExpress DP
1.4 (HBR3)
eDP 1.4
Tx
DisplayPort Type-C
DP 1.4/Type-C
RX
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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
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Q and A
3 MAY 2018 TEKTRONIX DISPLAY SOLUTIONS 38