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Having hub only on USB2 lines | Cypress Semiconductor

Having hub only on USB2 lines

Summary: 1 Reply, Latest post by Madhu Sudhan on 22 Jun 2016 09:50 PM PDT
Verified Answers: 0
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admin_1473091's picture
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In USB3 devices, are the USB3 lines and USB2 lines completely separate ?  Can a USB3 chip work in USB3 mode with only RX/TX connected and not D+/D- ? I'm asking if it's possible to do the following:

I know that for sure both devices will work in USB2-only mode just fine, but will the FX3 chip in such a connection work in USB3 mode also ? Or is there signaling on the USB2 lines, even in USB3 mode, that requires there be a direct connection ?


mady's picture
Cypress Employee
964 posts


Such a connection is not possible. FX3 needs a single host for both USB 2.0 and USB 3.0


- Madhu Sudhan

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