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USB Superspeed Peripherals

New Contributor

Hi,

I am making a design based on the CYUSB3304-68LTXC USB3.0 hub. The reference document is the eval kit schematic. There is a discrepancy on the interfacing of the dwnstream ports to the USB Type A connectors. I have pasted a screen-shot below.

pastedImage_0.png

It shows the pins StdA_SSRX+ and StdA_SSRX- connected to DS1_RXM and DS1_RXP respectively in the IC. How is that possible ? Shouldnt the connections be swapped ? And what of the StdA_SSTX- and StdA_SSTX+ ? Should this also be so ?

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Moderator
Moderator

Hi,

That's the feature of USB 3.0 signal. The polarity can be swapped on USB 3.0 differential pairs. SSRX+ and SSRX- can be swapped. SSTX+ and SSTX- can also be swapped. USB Differential Pair Pin Inversion - KBA218753

Regards,
Eddie

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1 Reply
Moderator
Moderator

Hi,

That's the feature of USB 3.0 signal. The polarity can be swapped on USB 3.0 differential pairs. SSRX+ and SSRX- can be swapped. SSTX+ and SSTX- can also be swapped. USB Differential Pair Pin Inversion - KBA218753

Regards,
Eddie

View solution in original post

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