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FX3 DVK schematics | Cypress Semiconductor

FX3 DVK schematics

Summary: 2 Replies, Latest post by kaiyu on 22 Nov 2013 07:19 AM PST
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kaiyu's picture
49 posts


In your schematics there is a polarity inversion for the SS_RX between the connector and the FX3.

Is that done on purspose?


rskv's picture
Cypress Employee
1134 posts



The polarity can be swapped on the USB 3.0 differential pairs. Polarity detection is done automatically by the USB 3.0 PHY during link training,

as define in the USB 3.0 specification section 6.4.2, and does not require any additional changes to device Firmware. Given the different USB connectors pin-out,

the polarity inversion mechanism can be utilized to ensure that USB traces do not cross each other.


For more details on FX3 hardware design guidelines, please refer to 

EZ-USB® FX3™/FX3S™ Hardware Design Guidelines and Schematic Checklist



Sai Krishna.

kaiyu's picture
49 posts

 Thank you!

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