Reference Reset from High Speed
Reset from High Speed
This test calculates the time between the beginning of the last SOF and before the reset and the beginning
of Chirp-K for Device and HUB upstream. This must be between 3.1 ms and 6 ms. To get the Reset from
High-Speed M
easurement signal, hot-plug the unit under test (device) and measure the signaling with
single-ended probes on both lines. The application analyzes data for Reset From High Speed Time.
Low Speed Downstream Signal Quality Host Equipment Setup
To set up the equipment for Low Speed Downstream Signal Quality test, follow these steps:
1. Connect a cable betwe en the A receptacle from the Inrush test section of the test fixture and the
USB device.
2. Connect Ch1 of the D+ probe to the D+ pins on the Inrush section of the test fixture.
3. Connect Ch2 of the D– p robe to the D– pins on the Inrush section of the test fixture.
4. Use the connectors to connect the A pin dongle from the Inrush section of the test fi xture to any
port of the unit under test (host or PC).
5. Select the measurement and select the
command button to run the application.
6. Select OK after acquiring a waveform. Verify that it is a correct waveform.
190 TDSUSB2 Universal Serial Bus Measurements Package
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