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USB Superspeed Peripherals

Anonymous
Not applicable

We designed a USB3.0 testing device besed on cyusb3035 for TV manufacture factory,but it cannot detect this kind of situation that  one of four differencial(SSRX+,SSRX-  SStx+,SStx-) signals line short to  GND,it  operate normally. How can i solve it? 

    by the way ,how to disable lane polarity inversion function?

thanks.

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1 Solution
prc_1505996
Contributor

Hi,

   Device can function in USB3.0 (SuperSpeed) mode even with one of the differential lines permanently connected to GND, but not reliably in noisy environments. Measuring impedance between GND and USB lines can be the simplest solution to your problem.

Tnx,

View solution in original post

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4 Replies
Anonymous
Not applicable

Hi,

1) The device might be working in USB 2.0 mode when you short any of those lines to ground. Please check this.

2) The polarity inversion detection is an inbuilt feature. It cannot be disabled.

Regards,

- Madhu Sudhan

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Anonymous
Not applicable

Hi,Mr Madhu

    we have disconnected the USB2.0 data line,we make sure it‘s working in usb3.0 mode。

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prc_1505996
Contributor

Hi,

   Device can function in USB3.0 (SuperSpeed) mode even with one of the differential lines permanently connected to GND, but not reliably in noisy environments. Measuring impedance between GND and USB lines can be the simplest solution to your problem.

Tnx,

View solution in original post

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Anonymous
Not applicable

Hi

   During the testing process on production line(FCT system),the target board and the test tools are powered on,it's hard to measure the impedance between gnd and USB3.0 data lines, if we want to measure the impedance ,we need    ICT system .it's more complicate.

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