Extensible Host Controller Interface: Difference between revisions

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Power efficiency: USB 1.x and 2.0 devices still need to be polled because they cannot send any data until the USB controller polls them. Also fix grammar error
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'''eXtensible Host Controller Interface (xHCI)''' is a computer interface specification that defines a register-level description of a Host Controller for Universal Serial bus (USB), which is capable of interfacing with USB 1.x, 2.0, and 3.0 compatible devices. The specification is also referred to as the [[USB 3.0]] Host Controller specification.