SuperSpeed interoperability with USB 3.0 controllers | Cypress Semiconductor
SuperSpeed interoperability with USB 3.0 controllers
We've got several PCs here with various USB 3.0 controllers. ASMedia and NEC as well as a new Z77-based PC with the controller integrated into the chipset.
We have varying levels of success with the FX3 coming up SuperSpeed on these. Most PCs run Win7-64, although we've also tried Win7-32 and have a Win8 (Customer Preview) desktop. The Z77 appears to work fine. The others are a bit confused.
They all work when the FX3 comes up as a USB 2.0 host. Upon renumeration, however, the devices sometimes never come up. Sometimes come up after several (20+) seconds. This is with all sorts of cable lengths from 1m to 3m. Our USB 3.0 memory sticks come up reliably on all.
Has anyone else experienced such a varying level of success getting the FX3 to enumerate as SuperSpeed? Any known pitfalls? We'd expect a REALLY hard time with our customers if this was common among them.
Note that these issues persist with our own device board as well as the Cypress DVK.