We are using your HUB integrated circuit (TUSB8042AI).
We have performed the compliance test and USB 3.0 is
succeeded. but USB2.0 has failed.
Failures are occurring on Upstream and Downstream (3 ports).
The details of the failure are in the Eye Diagram.
(I would like to send you the Eye Diagram in PDF format, so please let me know your e-mail address.).
The observed waveform at that time shows a large swing to the
negative side at the beginning of the signal.
We believe that this signal is causing the Fail.
What is the cause of this kind of signal?
