SLLU212C January   2015  – December 2023 TUSB211 , TUSB211A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Configuration Switches
  5. 2Test Headers
  6. 3EVM Operation
  7. 4USB 2.0 High-Speed Eye Diagram Testing
  8. 5Revision History

4 USB 2.0 High-Speed Eye Diagram Testing

When performing USB 2.0 Compliance Eye-Diagram testing with a Host or the downstream port of a HUB with the TUSB211A, a scenario can occur where the TUSB211A signal boosting is not enabled. This can occur when the test packets are being transmitted before the USB Test Fixture is connected to the TUSB211A. This scenario does not occur during Device Compliance Eye-Diagram testing as the USB Test Fixture must always be connected while testing a Device. This scenario only occurs during the Compliance testing with the USB Test Fixtures and does not affect normal operation with a Host, HUB, or Device.

Closely following the test procedures provided by the scope equipment vendor and USB-IF (links provided at the end of this section) avoids this scenario. Specifically, the USB HS test fixture must be connected prior to executing the TEST PACKETS using the HSETT test tool. Alternatively, if the test fixture is hot-plugged to the Host or downstream HUB port after the command to send Test Packets has already been entered using the HSETT tool, it is necessary to select TEST PACKETS and click Execute again after the test fixture is connected to make sure the TUSB211A detects a compliance test set-up.

The following generic procedure can be used to take the USB 2.0 compliance eye-diagrams. Details are provided in the Test Procedure documents referenced at the end of this section:

  1. Connect the USB Test Fixture to the host, downstream HUB (+ TUSB211A) Port or Device under test.
  2. Configure the Host, or HUB, or Device using xHSETT or HSETT to send test packets using the procedure detailed in the HSETT documentation.
  3. Start sending Test Packets.
  4. Capture Test Packet on scope to display eye (Running Compliance software on the scope).

USB 2.0 Compliance Eye-Diagrams can be taken on Host, Device, and HUB platform ports configured with the TUSB211A using the EHCI and xHCI High-Speed Electrical Test Tool application provided by the USB Implementers Forum.

Details for setting up and running the application are detailed in the Test Tool Setup Instruction document provided by the USB-IF at the following link:

http://www.usb.org/developers/tools/HSETT_Instruction_0_4_1.pdf

xHCI (USB 3.0 Host) – XHSETT test application:

http://www.usb.org/developers/tools/

EHCI (USB 2.0 Host) – EHSETT test application:

http://www.usb.org/developers/tools/usb20_tools/

Vendor-Specific Test Procedures:

http://www.usb.org/developers/compliance/electrical_tests/