Agilent Measurement Journal - Issue 5 - 2008 - (Page 61)

Also unique to the FlexRay speciﬁcation is the creation of only generic error messages by standard FlexRay controllers (e.g., Bosch E-Ray controller). Only correct packets are handed to the upper layers; further details, such as why and when communication was terminated, are not shown. Therefore, the ideal protocol analyzer for FlexRay networks should include an additional measurement controller capable of detecting various protocol errors and timing issues. These errors can then be used as speciﬁc triggers for associated errors. It is also important to note that there is no synchronous communication at the start and during the initial synchronization of the FlexRay protocol. Consequently, the ideal protocol analyzer must be able to capture asynchronous communication until synchronicity is reached. Switching between the asynchronous and synchronous modes should be automatic. This is crucial in cases where no Fibex data ﬁles are available. The ideal protocol analyzer must also be capable of displaying the FlexRay packets going across the bus — without knowing the cycle or slot timing. Deﬁning a viable solution The Agilent J8130A Vehicle Protocol Tester Series 1000 (VPT1000) is a prime example of a FlexRay protocol analyzer that meets the requirements identiﬁed above for the protocol layer quality metric (Figure 4). It provides powerful hardware processing and the deep memory required to meet the analysis requirements linked to FlexRay networks running at speeds of up to 10 Mbps. Additionally, it provides the fastest time to insight by enabling car makers to increase productivity through powerful data capture, in-depth analysis with visualization capabilities and standalone data logging. Figure 4. Agilent FlexRay VPT1000 supports protocol layer testing. Figure 5. A sample screenshot of the VPT1000 FlexRay analyzer software. Agilent Measurement Journal 61

Table of Contents Feed for the Digital Edition of Agilent Measurement Journal - Issue 5 - 2008

Agilent Measurement Journal Issue 5 Finding a New Path when Assumptions Break Down Contents Testing MIPI D-PHY Protocols Oscilloscope Firmware Update DNA Replication Joining the LTE/SAE Trial Initiative Testing Proteins Praise for DC Power Analyzer Scripting Features for AMDS Testing Hybrid PCBA Systems Improving the Gene Expression System Workflow Turning a “Good Enough” Test Strategy into One That’s Reliable, Repeatable and Traceable Understanding the Effects of Limited-Bandwidth Channels on Digital Data Signals Introducing the 3GPP LTE Downlink Validating the 26 Validating the Physical and Protocol Layers in DDR Memory Interfaces Understanding Total Jitter Measurements of Low Probabilities Using Behavioral-Model Simulation to Accurately Predict First-Order PLL Performance Creating Synchronous High-Frequency Sampling across Multiple Digitizers Overcoming the Challenges of Testing FlexRay Networks Understanding Operating Life and Repeatability of Electromechanical Switches and their Effect on Total Cost of Ownership Implementing Micro and Nano LC/MS Techniques for High Sensitivity Lipidomics Analysis

Agilent Measurement Journal - Issue 5 - 2008

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