USB 2.0 Electrical Testing Software for 5 Series MSO
Design validation and debug
Testing the design can easily be accomplished early in the design process and ahead of final compliance testing by using the 5 Series MSO oscilloscope. The oscilloscope’s standard measurement set, along with the optional 5-DJA Advanced Jitter and Timing Analysis software supports several of the key compliance tests including:
- Eye diagram analysis of USB signals
- Full characterization of jitter performance including TIE and histogram profiles
- Rise and fall time analysis
Eye pattern analysis is a proven technique to evaluate long data streams of complex communication signals. Eye pattern display is standard in the 5 Series MSO, but Advanced Jitter and Eye Analysis software (option 5-DJA) provides 31 additional measurements and jitter decomposition algorithms to help get to root cause.
Tektronix also offers an optional 5-SRUSB2 decode and trigger solution to perform USB specific protocol level analysis on the design.
Using the signal analysis and protocol decoder increases the likelihood of passing compliance tests, and can provide broader insight beyond the standard compliance tests.
Detailed analysis of a USB 2.0 signal using the 5 Series MSO measurement plots and optional Advanced Jitter Analysis (5-DJA) measurements
Automated USB 2.0 testing with option 5-CMUSB2
USB 2.0 electrical testing requires an oscilloscope with minimum bandwidth of 2 GHz. TekExpress USB2 software for the 5 Series MSO (5-CMUSB2) provides automated pre-compliance testing for USB 2.0 serial bus verification, including:
- High-speed tests: Signal Quality, Receiver Sensitivity, Chirp, Reset, Reset from High Speed, Reset from Suspend, Resume, and Suspend
- Eye diagram, Jitter, Rise time, Fall time, and EOP width
- Packet Parameter and Monotonicity
- Power measurements: Droop and Inrush current
TekExpress USB2 supports Device, Host, and Hub test suites and each suite includes approximately 50 measurements. Executing all the measurements manually is extremely time-consuming. TekExpress USB2 software has an automation framework built around these measurements, so that you can execute all the measurements with fewer clicks and intervene only to change connections.
TekExpress USB2 software allows you to select complete or selective testing of any of the transmitter electrical specifications. Tests are configured by following a step-by-step process. The software sets up the oscilloscope and automates the testing, guiding you to accurate and repeatable results. It generates a comprehensive, date-stamped test report with pass/fail results, waveforms, and data plots.
TekExpress USB2 DUT panel configures the DUT specific settings
Software navigation follows a logical workflow for quick test setups, changes and review of test results. Valid testing requires proper cabling, probes, and connections between fixtures, instruments, and the device under test (DUT). The software provides setup instructions for each test, with images and reference illustrations showing correct configurations.
Typical USB 2.0 setup configuration
TekExpress USB2 software requires a Tektronix 5 Series MSO oscilloscope with Option 5-WIN or SUP5-WIN (Microsoft Windows 10). This is a Windows application and the software displays TekExpress USB2 software and test reports on the oscilloscope display. However, for convenience an external monitor may be connected to the 5 Series MSO so test controls and reports can be viewed on the external display, while signal acquisition is observed on the primary oscilloscope display.
Displaying the high speed signal quality plot during execution
For each test, the DUT must be placed in specific operating modes using industry standard HS electrical test tool software (USBHSET.exe) from the USB Implementers Forum, Inc (USB-IF). The USBHSET tool runs on a Windows PC. The PC can be connected to the 5 Series MSO via LAN (Ethernet), allowing TekExpress USB2 to communicate with the USBHSET tool to automatically put the DUT in the correct mode for each test.
For each test or series of tests, you select the test of interest. The TekExpress software shows you how to configure the DUT with proper test fixtures, cables or probes. You initiate the test and the software performs all the necessary instrument setups and prompts you only when needed. Quick Pass/Fail tests substantiated with results makes USB 2.0 application the preferred solution for USB 2.0 physical-layer validation. The user-defined measurement limits and custom-mask testing also helps you to perform tolerance testing.
Jitter measurement results displayed in a table, along with limits and margin
Custom Mask (red) with standard USB-IF mask (black) as reference
The TekExpress USB2 application has a dedicated Plots panel, which helps you to analyze eye diagrams and signal quality. The panel also allows you to place cursors, zoom into the plot and save the plot as an image. This allows you to perform eye diagram analysis with custom masks and evaluate device margins.
Creating test documentation is quick and easy with summary reports available in MHTML, CSV, or PDF formats. The report is generated automatically when the test execution is complete and provides Pass/Fail status for measurements. The report also includes test configuration details, waveform plots, oscilloscope displays and margin analysis, to provide more insights into your design.
TekExpress USB2 report showing setup details and measurement results
Probing and test fixtures
The following probes are recommended for USB 2.0 testing:
Differential probes: P6248, P6330, TDP1500, and TDP3500
Single-ended probes: P6245, TAP1500, and TAP2500
Current probe for Inrush current test: TCP0030A
Fixtures provide connection points for USB 2.0 electrical testing.
The TDSUSBF test fixture set provides connections for Low-speed and Full-speed signal quality including both SMA and probe connections, Inrush Current, Drop and Droop, Receiver Sensitivity and Impedance Measurement tests. Probing points make it convenient for validation, but for pre-compliance testing, USBSIGQUAL must be used. TDSUSBF is available from Tektronix.
The High Speed Signal Quality fixture set (USB2SIGQUAL) provides SMA connections for performing eye diagram and other signal quality measurements. This fixture is used for compliance testing and is available from the USB-IF.
The USB 2.0 / 3.0 Drop-Droop fixture (USB2/3_DD) from USB-IF provides sufficient loads for testing voltage drop and droop levels while testing Host or Hubs (downstream ports supplying VBUS).
USB 2.0 test fixture set
- USB tests
- Host, Hub, and Device
- Signal Quality tests
- Eye Diagram Test, Jitter (JK, KJ, and Consecutive), Crossover Voltage Range, Signal Rate, End-of-Packet Width, Rising Edge Rate, and Falling Edge Rate
- High-speed tests
- Receiver Sensitivity, Chirp, Reset, Resume, Reset from High Speed, Reset from Suspend, Packet Parameter, and Edge Monotonicity
- Inrush Current check
- Data-sufficiency readout. Coulombs and Capacitance listed across inrush regions
- Droop test
- Volts readout
- Speed selection
- Low-speed (LS), Full-speed (FS), and High-speed (HS)
- Signal direction
- Upstream and Downstream
- Test Point selection
- Near End and Far End
- Report Generation format
- MHTML, PDF, and CSV formats
Tektronix offers a range of solutions for USB testing, including HSIC (High Speed Inter Connect) and USB 3.0. To see a comprehensive listing, and download the latest resources, visitwww.tek.com/usb.
For all probing related information, visitwww.tek.com/probe-selector.
For exploring other supported application and capabilities of latest Tektronix 5 series MSO oscilloscope, visitwww.tek.com/oscilloscope/5-series-mso-mixed-signal-oscilloscope.
For USB 2.0 standards documents and test procedures, as well as USBHSET software and test fixtures, please visitwww.usb.org/home.