Yes. We have tested the SDK examples on FX3 DVK and they work in USB3.0 mode only.
Are you using the FX3 DVK from Cypress or you made a custom board using FX3. Please let me know.
I have tested on both the development kit from Cypress and our own designed board. I have tested on three different PCs (with Renesas, Intel and NEC host controllers). On the the machine with Renesas host I have made tests with Win7 64-bit, and XP 64-bit. We have verified the USB-cables by connecting a PointGrey USB3 camera and a USB3 HDD. I have used USB3.0 CV (from USB.org) but the problem here is not a currupt descriptor.
My guess is that the FX3 doesn't dectect a proper SS receiver termination. I have no measurement quipment, so I can not "see the physical layer" (Why no SS ennumeration - are there any link training, polling etc on the bus etc, where does the state machine halt)
Is this (not enumerating in SuperSpeed) happening sometimes or it is the condition always.
It is hard to identify the root cause with out having any protocol analyzer to analize the data on the physical bus.