SDAA408 July   2026 TUSB7320 , TUSB7340

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Hardware Configuration and Setup
  6. 3Software Preparation and Environment Setup
  7. 4Memory-Mapped I/O (MMIO) Register Configuration
  8. 5Summary
  9. 6References

2 Hardware Configuration and Setup

Test Setup Overview

To capture accurate waveforms for USB 2.0 electrical compliance testing, a proper physical connection between the Device Under Test (DUT), the test fixture, and the measurement equipment is required. The test configuration must isolate the USB 2.0 signaling lines (D+ and D-) to allow the oscilloscope to probe the continuous test patterns generated by the TUSB7320 or TUSB7340 downstream ports.

Required Equipment and Materials

The following hardware components are necessary to perform the evaluation: Host System (DUT): A hardware platform integrating the TUSB7320 or TUSB7340 host controller, running a functional Linux distribution.

  • USB 2.0 Compliance Test Fixture: A standard USB-IF certified test board (such as the USB 2.0 Signal Quality Test Board) to break out the D+ and D- lines.
  • Digital Storage Oscilloscope: A high-bandwidth oscilloscope (typically 2 GHz bandwidth for USB 2.0 High-Speed compliance) equipped with compliance analysis software.
  • Probes/Cables: High-quality SMA cables or matched differential probes with appropriate bandwidth ratings to connect the fixture to the oscilloscope channels.

Hardware Connection Procedure and Requirements

To verify the TUSB7320/TUSB7340 controller successfully transitions into the commanded compliance state, the physical connection sequence must adhere to the following steps:

  1. De-energize and Ground the System: Ensure the DUT and the oscilloscope share a common chassis ground to prevent Electrostatic Discharge (ESD) damage or ground loops from distorting the high-speed signaling measurements.
  2. Connect the Test Fixture: Attach the USB-IF compliance test fixture directly to the target downstream USB port of the TUSB7320 or TUSB7340 being evaluated.
  3. Establish Measurement Probing: Connect the SMA outputs or the differential probes from the test fixture's test points (corresponding to the selected port) to the input channels of the oscilloscope.
  4. Verify Test Fixture Termination: Ensure that the test fixture is configured with the standard 50 Ω termination (or 90 Ω differential termination) as required by the specific test suite (for example, Test Packet or Test J/K).

Critical Hardware Note

The TUSB7320 and TUSB7340 utilize internal port logic to detect line state transitions and attach events. The physical test fixture must be connected to the port under test prior to executing the Linux software commands. If the controller does not detect the correct termination load on the D+ / D- lines, the port configuration logic can reject the test state transition or automatically reset the port, preventing the generation of the compliance pattern.