<Li> Provide the ability for different markets to differentiate hardware capabilities, e.g. target host controller power, performance and cost trade - offs for specific markets </Li> <Li> Define an extensible architecture that provides an easy path for new USB specifications and technologies, such as higher bandwidth interfaces, optical transmission medium, etc., without requiring the definition of yet another USB host controller interface </Li> <P> The OHCI and UHCI controllers support only USB 1 speed devices (1.5 Mbit / s and 12 Mbit / s), and the EHCI only supports USB 2 devices (480 Mbit / s). </P> <P> The xHCI architecture was designed to support all USB speeds, including SuperSpeed (5 Gbit / s) and future speeds, under a single driver stack . </P>

Intel usb 3.0 extensible host controller what is it