Table 8-5. Table of Recommended Settings (continued)

BOOST and RX_SEN settings (1)for channel loss

1-4 meter

Level 1

Medium or High

(1)

These parameters are starting values for different cable lengths. Further tuning might be required based on specific host and/or device

as well as cable length and loss profile.

8.2.2.1 Test Procedure to Construct USB High-speed Eye Diagram

Note

USB-IF certification tests for High-speed eye masks require the mandated use of the USB-IF

developed test fixtures. These test fixtures do not require the use of oscilloscope probes. Instead

they use SMA cables. More information can be found at the USB-IF Compliance Updates Page. It is

located under the Electrical Specifications section, ID 86 dated March 2013.

The following procedure must be followed before using any oscilloscope compliance software to construct a USB

High-speed Eye Mask:

8.2.2.1.1 For a Host Side Application

1. Configure the TUSB216I to the desired BOOST setting

2. Power on (or toggle the RSTN pin if already powered on) the TUSB216I

3. Using SMA cables, connect the oscilloscope and the USB-IF host-side test fixture to the TUSB216I

4. Enable the host to transmit USB TEST_PACKET

5. Execute the oscilloscope USB compliance software.

6. Repeat the above steps in order to re-test TUSB216I with a different BOOST setting (must reset to change)

8.2.2.1.2 For a Device Side Application

1. Configure the TUSB216I to the desired BOOST setting

2. Power on (or toggle the RSTN pin if already powered on) the TUSB216I

3. Connect a USB host, the USB-IF device-side test fixture, and USB device to the TUSB216I. Ensure that the

USB-IF device test fixture is configured to the ‘INIT’ position

4. Allow the host to enumerate the device

5. Enable the device to transmit USB TEST_PACKET

6. Using SMA cables, connect the oscilloscope to the USB-IF device-side test fixture and ensure that the

device-side test fixture is configured to the ‘TEST’ position.

7. Execute the oscilloscope USB compliance software.

8. Repeat the above steps in order to re-test TUSB216I with a different BOOST setting (must reset to change)

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TUSB216I

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