Strictly necessary cookies are on by default and cannot be turned off. Functional, Performance and Tracking/targeting/sharing cookies can be turned on below based on your preferences (this banner will remain available for you to accept cookies). You may change your cookie settings by deleting cookies from your browser. Then this banner will appear again. You can learn more details about cookies HERE.
Strictly necessary (always on)
Functional, Performance and Tracking/targeting/sharing (default off)
Why are the SSRX_N and SSRX_P pins swapped in the CYUSB3KIT-003? Is it possible to swap SSTX_N and SSTX_P? Is it correct to swap USB 2.0 differential pair (D+ and D-)?
The polarity can be swapped on USB 3.0 differential pairs. Polarity detection is done automatically by the USB 3.0 PHY during link training (called TSEQs), as defined in the USB 3.0 specification section 6.4.2. This does not require any additional change in device firmware. In the design of the PCB layout, SSRX_N and SSRX_P (or the TX pairs) may cross with each other. Inversion is recommended to avoid this crossing.
However, inversion is not allowed with USB 2.0 differential pair since inversion detection is not implemented in USB 2.0.