This feature description is new in the Solaris 9 4/04 release.
Features of the EHCI driver include the following:
Compliance with enhanced host controller interface that supports USB 2.0.
Support for high-speed control, bulk, and interrupt transfers.
Currently, no support is available for high-speed isochronous or split transactions. For example, you cannot connect USB 1.x devices to a 2.0 hub that is connected to a USB 2.0 port.
If you have both USB 2.0 and USB 1.0 or 1.1 devices on your system, the EHCI and OHCI drivers hand-off device control, depending on the type of device that is connected to the system.
The USB 2.0 PCI card has one EHCI controller and one or more OHCI controllers.
A USB 1.1 device is dynamically assigned to the OHCI controller when it is connected.
A USB 2.0 device is dynamically assigned to the EHCI controller when it is connected.