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6. Physical Layer
When viewing Physical Layer and Link Layer test activity in the USB
Explorer 280 analyzer software application, it is generally best that the
user disable the “grouping” feature (uncheck Enable Grouping),
located in the Grouping drop-down selection in the USB 3.0
Overview. Disabling grouping leaves the user with the low-level view
needed for a proper understanding of test sequences that are
conducted in Chapters 6 and 7 tests. In some tests however, control
transfers are used, and in these tests the user may find it more
intuitive to leave Grouping enabled.
6.1 Lane Polarity Inversion Test
Test Summary
This test verifies that the PUT can properly accommodate reception of reversed polarity.
Test Steps and Expected Results
1. Examiner reverses polarity on its transmit lines prior to the first TSEQ, trains the link, and
brings the device to U0.
The PUT must achieve U0 and stay in U0 for at least 50ms.
Specification Reference
Section 7.5.4.4.1#1