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Keysight N6460B
MHL Source Compliance Test Software
For Infiniium Oscilloscopes
Data Sheet
Introduction
MHL Source Compliance Test Software for Infiniium oscilloscopes provides you with a certified accurate way to verify and characterize your Mobile High Definition Link1 (MHL) designs for mobile devices such as cell phones and tablets. The MHL source compliance test software is used in the MHL Authorized Test Centers (ATCs) and has been tested thoroughly and validated by MHL semiconductor leader Silicon Image for device compliance testing so you can confidently use it to execute MHL electrical checklist tests as well as employ it as a development tool.
The MHL Source Compliance Test Software performs the full physical layer compliance suites for MHL data transmission as identified in the MHL Compliance Test Specification 1.x, 2.x and 3.2 (CTS v3.2). These tests, in conjunction with MHL protocol tests, represent the full compliance regimen to qualify an MHL portable source design at an MHL-authorized test center. For MHL 3 portable device testing, there are additional test requirements for receiving data – see Table 7, Portable Device Receiver Testing Equipment and Software.
As an MHL adopter, your product must successfully pass compliance testing based on the MHL CTS specification so you can get a jump on the process by testing with the same instrumentation and software as the authorized test center. In this consumer market where weeks can determine success, this confidence will allow you to attend to higher risk areas in your product’s market delivery.
Features
The MHL Source Compliance Test Software offers several features to simplify the validation of MHL designs:
With the MHL electrical test software, you can use the same oscilloscope you use for everyday debugging to perform automated testing and margin analysis based on the MHL-specified test checklist.
About MHL
MHL provides an efficient and low-profile way for owners of mobile devices to view and share their pictures and other video content by simple connection to large-screen televisions and monitors. Released originally in 2011 (v1.1), the specification has continually been refreshed to stay ahead of the persistent push to higher resolutions. With version 3, support for 4k x 2k monitors is provided as well as bidirectional data for complete usability of both portable device and television or display in the operational MHL link.
MHL version 3 brings a number of improvements to MHL. First, it no longer uses the common mode clocking method (as in earlier versions) for the TMDS audio-video (AV) stream. Instead, the CBUS line, which is used for MHL device discovery and link maintenance, is used to transport a TMDS clock. The clock is always at 75 MHz, but the TMDS data rate can be fixed rates of 1.5, 3.0 and 6.0 Gbs. The highest data rate is used to support 4k x 2k resolution monitors. Another change that significantly affects the validation and compliance measurement task is that non-AV data (such as from Human Interface Devices) can be transmitted and received by any MHL device over the CBUS line. The changes in the CBUS line’s functionality warrants a nomenclature change to ‘e-CBUS,’ or the extended CBUS. Data is sent on the falling edge of the clock signal by modulating the location of the edge.
A conceptual view of the MHL 3 interface/capability is shown below:
MHL Source Compliance Test Software Saves You Time
The MHL Source Compliance Test Software saves you time by setting the stage for automatic execution of MHL electrical tests. Most of the difficulty of performing electrical tests for MHL lies in understanding the test requirements; confidently achieving proper connection of the oscilloscope to the target device; configuring the instrument for measurement; executing the test procedure; and then analyzing the measured results by comparing them to limits published in the specification. The MHL Electrical Test Software incorporates the CTS requirements in the tests, explicitly guiding you through connection requirements and automatically making the measurements needed. The software also incorporates calibration functions for MHL signal generators to enable the accurate testing of MHL sinks and allowing the characterization of cable loss effects, etc., which can be helpful in system design.
The MHL Source Compliance Test Software offers all the single-ended, differential and common mode tests required for source testing of an MHL portable device as stipulated in the MHL CTS. The Keysight automated test engine quickly walks you through the steps required to define the tests; set them up; perform them; and then view their results. The user can pick high-level test parameters to suit test process objectives and then proceed to select a category of tests all at once or specify individual tests. The user interface is oriented to minimize your necessary reconnections, which saves you time and minimizes the potential for operator error. You can save tests and configurations as project files and recall them later for quick testing and review of previous test results. Straightforward menus let you perform tests with a minimum number of mouse clicks. The software automatically configures the oscilloscope for each test; prompts the user for test connection and configuration; and provides an informative results report that includes margin analysis that indicates how close your product came to passing or failing that specification. See Table 1(a) and Table 1(b) for a complete list of the measurements made by the MHL Source Compliance Test Software.
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