2.0. For the 1s versions there are still the Universal
Host Controller Interface (UHCI) and the Open Host
ControllerInterface (OHCI) and for USB 3.0
the Extensible Host Controller Interface (xHCI). The EHCI interface for USB 2.0 is a specification for the high-speed mode of USB 2.0 with 480 Mbit/s. The EHCI interface for USB 2.0 is adriver software
.0. When transferring to a device of the 1 version, these must still be supported by the other drivers UHCI and OHCI.