MOST50, MOST150, CAN, LIN Compliance Solution

Features & Benefits

MOST Essentials for MOST50 and MOST150

• Automated DPOJET MOST Setup Library reduces the complexity of executing MOST50 and MOST150 tests, significantly saves test time and resource costs, and enables you to test devices faster
• Automates 100% normative compliance test coverage for all test points of both MOST50 and MOST150 specifications. In addition, it includes informative tests for MOST150-SP3 test points
• Seamless debug allows pausing on each automated test, and switching to configurations for detailed analysis and debug on all tests
• Automated setups ensure better accuracy and repeatability of results, and avoids requiring the test engineer to be an expert on MOST50 and MOST150 testing procedures
• Single oscilloscope setup enables signal integrity tests for both electrical and optical test points of MOST150, using optical-to-electrical converter probes
• Flexible Setup Library allows modifying the setting and limits of the temperature oven and other environmental testing conditions
• Fully customizable Setup Library allows adding additional measurements to the test suite for comprehensive characterization

TDSVNM for CAN and LIN

• CAN eye diagram analysis quickly locates noise in the CAN message caused by jitter, amplitude aberration, spikes, and glitches
• Oscillator tolerance measurements help in addressing network synchronization issues
• Integrated search functions help to efficiently debug network problems at the data link layer
• Bus traffic measurement helps in optimizing network performance for different CAN message frames
• Simultaneous protocol decoding of CAN and LIN messages helps in ensuring communication accuracy and acceptable latency between two network segments
• Ability to link decoded and time-stamped CAN messages to their timing waveform, to more clearly visualize bus functions

Applications

• MOST50 host and device silicon characterization, debug, and validation
• MOST150 host and device silicon characterization, debug, and validation
• MOST system integration and validation
• MOST manufacturing test
• In-vehicle network integration
• Easy system integration
• CAN and LIN protocol decoding

 

MOST50 and MOST150 Validation with MOST Essentials

DPOJET software with automated MOST Essentials Setup Library provides a complete set of measurements required for MOST50 and MOST150 compliance testing. MOST Essentials enables characterization, debug analysis, and conformance testing according to the MOST base specification and conformance specifications.

TDSVNM analyzing the CAN and LIN messages simultaneously.

MOST Automated Testing – Save Time and Resources

Location of MOST50 specification test points.


Location of MOST150 specification test points.


Test setup diagram of MOST50-SP3E test point.


Test setup diagram of MOST50-SP4E test point.


Test setup diagram of MOST150-SP2 test point.

There is no longer a need to be an expert on MOST testing procedures. Remembering the exact steps to take each measurement is time consuming and often requires going back to the MOST specifications. MOST Essentials takes the guesswork out of conducting MOST50 and MOST150 compliance testing. Even if you remember how to use the test equipment, it is common for even the most experienced operators to forget steps in the procedure or to set up the correct parameters, such as applying the correct record length and sampling rates.

The automated DPOJET Setup Library for MOST provides standard-specific details and predefined scope settings for each measurement, so the user does not need to be an expert. MOST Essentials minimizes the setup initialization problems, reduces the complexity of executing MOST tests, and enables you to test devices faster.

100% Test Coverage

DPOJET Opt. MOST provides 100% test coverage of normative tests for both MOST50 and MOST150, and includes informative tests at MOST150-SP3 test points.

MOST Essentials provides a complete set of normative and informative measurements to be performed across all four test points, for both MOST50 and MOST150 compliance testing. Some of the measurements include Eye Mask Hits, Alignment Jitter, Transfer Jitter, B0/B1, Overshoot, and Undershoot.

Eye Diagram Measurement

Eye diagram testing for MOST requires testing mask hits at different segment portions of an eye mask, across different test points for both MOST50 and MOST150.

Overshoot and Undershoot Measurements

Optical undershoot mask using Opt. MOST Essentials.

Measurement of the optical overshoot and undershoot is required to ensure proper operation of the optical receiver. The optical pulse shape is tested with a parameterized mask. The mask parameters are based on the measured optical logic levels b0 and b1 (High Ref and Low Ref). Optical transmitting devices must produce an optical signal complying with the defined mask, when driven with a compliant electrical signal.

Transferred Jitter and Alignment Jitter Measurements

Jitter is the phase deviation between an edge of the waveform and the correlating transition of the recovered UI clock. For transferred jitter, only phase variations coming with rising edges of the waveform are relevant, because only these deviations are tracked by the PLL and impact the recovered clock’s phase.

Alignment Jitter is the phase deviation between any edge of the waveform and the correlating transition of the recovered UI clock. Calculating the misalignment between clock and data for each data transition and drawing the successive phase deviations over run time in a graph results in an “AJ-Track” which is the base for further evaluations.

Extinction Ratio Measurement

Extinction Ratio is calculated based on the measured optical levels for b1 and b0 (High Ref and Low Ref) by using a high-precision DC-coupled O/E converter.

Seamless Debug and Analysis with MOST Essentials

MOST Essentials helps perform step-by-step debugging on failures. MOST Essentials helps debug faster and discover sources of jitter and signal integrity issues more quickly.

Flexible and Customizable for Characterization

Seamless Debug or Setup Customization with Opt. MOST – Example of modifying clock recovery settings for MOST50 and MOST150.

The MOST Essentials Setup Library is highly flexible, and fully customizable. It allows modification of the measurement settings, scope configurations, limits, and other parameters, and then saving the customized setup. For example, when testing a MOST50 or MOST150 DUT in an automotive temperature chamber setup or when using optical cables or remote XL cables in the setup, a user can define additional filter files and custom limits to fine-tune the setup conditions.

Plots and Results

Results for MOST50 and MOST150.

The DPOJET Plot feature for MOST Essentials helps characterize MOST devices with detailed visual representations. The Result section helps design engineers to look at the test results quickly and clearly. The Report section includes details of each test including Limits, Measured Value, Pass/Fail Results, etc.

Detailed Reports

Report for MOST150 on an Overshoot and Undershoot measurement with Pass/Fail summary and oscilloscope waveform screenshots.


Report for MOST150-SP4 test point with Pass/Fail status.


Report for MOST150-SP1 test point with Pass/Fail status along with margin details, eye diagram, and other statistics.

The MOST Essentials application generates thorough HTML/MHT reports that capture the performance, status, and test results of your device. It also captures eye diagrams, oscilloscope waveform screen captures, and test waveforms optionally. The report generation tool also provides features such as Report Appending, Auto-Incrementing Report Naming, Inserting User Comments, Listing Complete Configuration Details, etc. The Report Appending feature enables adding results from each of the four test points for both MOST50 and MOST150, and creating a single, printable report for sharing the results.

CAN and LIN Debug Test and Protocol Analysis

TDSVNM software transforms Tektronix real-time Windows oscilloscopes into sophisticated in-vehicle network management tools that provide trigger capabilities, oscillator tolerance, and simultaneous protocol analysis of CAN and LIN messages that help to ensure seamless and reliable operation of the network.

Seamless CAN Network Operation

The industry's finest timing measurements in TDSVNM make it an ideal tool for debugging problems for seamless operation of a CAN network. TDSVNM provides oscillator tolerance measurements enabling proper setting of the sample point in bit time. This ensures accurate sampling of incoming CAN messages in an asynchronous CAN network. Data rate measurement quickly identifies mismatch in data rates in any of the CAN nodes in the network. Mismatch in data rate can cause a series of error messages to be generated, hampering network performance.

Electrically, the automotive environment is noisy. CAN eye diagram analysis quickly pinpoints problems caused by excessive jitter, amplitude aberration, spikes, and glitches in CAN messages.

CAN and LIN Protocol Decode and Analysis

TDSVNM makes it very easy to interpret NRZ-encoded information in CAN and LIN messages. This software coverts the time domain information into data-link layer information (Hex or Binary) in CAN or LIN format, saving valuable design time. Time stamp information provided by the TDSVNM software quickly measures the latency time between the two associated messages for quick characterization, and debugging network performance. Using the zoom features, you can now easily view the specific CAN message at higher resolution during long time captures of the CAN/LIN traffic using the long acquisition memory of the oscilloscope.

The industry's first simultaneous protocol decoding of CAN and LIN data from two segments of an in-vehicle network makes TDSVNM a highly recommended tool for current and future needs. With this capability, engineers can easily ensure the accuracy of communication and the acceptable latency time for exchanging information across a gateway.

Capture CAN and LIN Data

The powerful trigger capabilities offered by DPO7000 Series' internal CAN triggers, coupled with the TDSVNM's graphical user interface, make this solution one of the best suited to analyze CAN and LIN traffic at specific conditions. By triggering on any of the CAN frame types and its bit value, engineers can debug difficult problems easily.