Agilent 5990-4923EN FlexRay Physical Layer Eye-diagram Mask Testing - Application Note c20140815 [8] free download

File name 5990-4923EN FlexRay Physical Layer Eye-diagram Mask Testing - Application Note c20140815 [8].pdf

Keysight Technologies FlexRay Physical Layer Eye-diagram Mask Testing Application Note Introduction Eye-diagram mask testing is one of the most important physical layer measurements that you can use to test the overall signal integrity of your FlexRay system. Keysight Technologies, Inc. provides seven different FlexRay mask files based on FlexRay physical layer standards/specifications for use with InfiniiVision 3000X, 4000X, 6000X, 6000, and 7000 Series oscilloscopes (DSO or MSO) from Keysight. Which particular mask file you use is determined by the baud rate of your system, the test plane where testing will be performed (receiver input or transmitter output), and the type of output device that may be under test (Bus Driver or Active Star). Eye-diagram testing is used in a broad range of today's higher speed serial bus applications including FlexRay. An eye-diagram is basically an overlay of digitized bits that shows when bits are valid (high or low). This provides a composite picture of the quality of a system's physical layer characteristics, which includes amplitude variations due to transmission line affects, reflections, over-shoot, ringing, signal edge placement, and jitter. Keysight scopes are the only scopes that can perform hardware-based FlexRay eye-diagram mask testing. With hardware-based mask testing, up to 200,000 waveforms can be tested per second. This enables you to test more bits faster to insure reliable operation of your FlexRay system. This application note will first provide you with an overview of the various types of FlexRay eye- diagram mask testing that can be performed. We will then provide you with simple step-by-step instructions on how to set up eye-diagram mask tests on a Keysight InfiniiVision series oscilloscope. 03 | Keysight | FlexRay Physical Layer Eye-diagram Mask Testing - Application Note A basic understanding of FlexRay eye-diagram mask testing Using FlexRay mask test files only requires that your InfiniiVision series scope be equipped with the latest FlexRay option as well as the Mask Test option. The following FlexRay mask test files are available to download from Keysight's website at no charge. FlexRay 10Mbs TP4 Mask.msk FlexRay 5Mbs TP4 Mask.msk FlexRay 2,5Mbs TP4 Mask.msk Figure 1: TP4 mask test setup. FlexRay 10Mbs TP1 Mask.msk FlexRay 10Mbs TP1-Incr V Mask.msk FlexRay 10Mbs TP11 Mask.msk FlexRay 10Mbs TP11-Incr V Mask.msk Receiver Input Mask Testing The three different TP4 mask files are for testing signals at the input of any FlexRay receiver. You should select the one that matches the baud rate of your FlexRay system. TP4 mask testing is the most common eye-diagram mask test for evaluating the over