DisplayPort 2.0 Pre-Compliance and Debug Solution

Tektronix provides the most comprehensive solution to serve the need of engineers designing DisplayPort silicon for computer systems and embedded systems, as well as for those who are validating the physical-layer compliance of DisplayPort devices as per the DisplayPort 2.0 Compliance Test Specification. Tektronix TekExpress DisplayPort 2.0 pre-compliance/debug solution help the customers to test their DP2.0 DUTs. The Tektronix Opt. DP20 application is compatible with Tektronix DPO/MSO 70000 DX/SX Series oscilloscopes that are designed to meet the challenges of the next generation of display standards such as HDMI and DisplayPort.

key features

• Complete testing of UHBR10, UHBR13.5, and UHBR20 as per DisplayPort 2.0 Specification
• Fixture De-embedding in differential and single-ended mode by creating a custom filter file using SDLA software to leverage the channel modeling and receiver equalization functionality
• Use of SDLA for TP3_EQ test point analysis
• Support repeatability of measurements
• Single report for UHBR10, UHBR135, and UHBR20 tests
• Optimized algorithms to execute tests with improved accuracy
• Optional signal validation helps to detect anomalies quickly in the signal
• Reports are available in mht, pdf, and csv formats for advanced data analysis
• Measurement results in the report can be grouped by lane
• Automation support and scripting interface with Iron Python which supports socket-based programming remote interface
• Capture and save DUT waveforms for offline analysis
• Measurement can be run for all selected Preset. Capability to run particular measurement on a subset of selected presets.

Solution overview

TekExpress DisplayPort 2.0 supports 16 presets for UHBR data rates. The DisplayPort 2.0 solution allows you to select preset to run individual measurements. With the support for TP2 test point and TP3_EQ test point, TekExpress DisplayPort allows you to have the flexibility to select settings for individual test and complete their DUT validation. The TekExpress solution provides the flexibility to select the cable models for the tests at TP3_EQ test point.

DisplayPort 2.0 Transmitter test overview

DisplayPort sources (transmitters) have state control requirements in order to transmit the data patterns and signal properties required to demonstrate conformance as per the compliance test specification. The following properties and patterns need to be transmitted for full measurement coverage:

• Bit rates: UHBR10, UHBR135, and UHBR20
• Data patterns: PRBS15
• Preset: 16 presets as defined
• Output levels: 800 mV
• SSC (spread spectrum): On/Off

Compliance to characterization support

Tektronix offers DisplayPort 2.0 DPOJET essentials package which comes bundled with TekExpress DisplayPort 2.0 Pre-Compliance and Debug solution that can be used to characterize a DUT and analyzing its finer behavior. It serves as an analysis tool when the DUT fails any portion of the compliance tests or you want to take a deeper look into the failures. All the compliance tests which are supported in the application and requires a single acquisition are supported in this package. You can build automation scripts around these measurements to setup a custom test environment. The DisplayPort 2.0 DPOJET solution also supports all measurement for lower data rates e.g., RBR, HBR, HBR2, and HBR3.

You can enable this package by running DisplayPort 2.0 from the Oscilloscope → Analyze menu. The DisplayPort 2.0 DPOJET measurement library helps in characterizing the silicon. Other advantage of this library is the ability to debug the measurement in case of failures. If any of the tests fail during compliance testing, you can tap into the DPOJET DisplayPort measurement library for a deeper dive into the failures such as Eye diagram mask hit failures and look at relation between Pre-emphasis level vs Voltage swing tests to perform root cause analysis. The solution also gives users the flexibility to configure measurements with different settings, make configuration changes in existing measurements on the fly, and run tests in single-shot or free-run repetitive modes.

DisplayPort 2.0 DPOJET solution comes with setup files. All measurements corresponding to a data rate and a particular pattern are clubbed in a single setup file. Setup files for lower data rates e.g. RBR, HBR, HBR2, and HBR3 are also included. Setup file helps to avoid any manual mistakes while configuring a measurement. This ensures that a non-expert user can also use the debug solution and validate the results.

SDLA features

SDLA enables the user to probe and visualize data at the required location (de-embed / embed) using virtual probing through test points. It can remove (de-embed) the effects of the cables, probes, and fixtures to get more accurate measurement results. It can embed user defined channel models to simulate the signal at the end of the link. It can also be used to open a closed eye using receiver equalization, Continuous Time Linear Equalizer (CTLE), Decision Feedback ( DFE), or Feed Forward Equalization (FFE). SDLA also has advanced analysis and modeling capabilities. One can view and measure multiple test points using DPOJET Jitter and Eye analysis comprehensive frequency and time domain plots, enable quick verification of S-parameters and test point transfer functions.

For DisplayPort 2.0, SDLA has been enhanced to provide the flexibility of choosing the optimal CTLE. To calculate optimal CTLE based on Eye Area, SDLA selects the appropriate DisplayPort standard from the CTLE dropdown menu and runs the configuration from 0 dB to -9 dB. Optimal CTLE waveforms gets loaded on the oscilloscope and can be configured.