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{{short description|Computer interface specification}}
{{More footnotes|date=April 2014}}
The '''eXtensible Host Controller Interface''' ('''xHCI''') is a technical specification that provides a detailed framework for the functioning of a computer's [[host controller]] for [[Universal Serial Bus]] (USB). Known alternately as the [[USB 3.0]] host controller specification, xHCI is designed to be backward compatible, supporting a wide range of USB devices from older USB 1.x to the more recent USB 3.x versions.
Distinct from its predecessors, the [[Open Host Controller Interface]] (OHCI) and the [[Universal Host Controller Interface]] (UHCI), xHCI offers several technological improvements. Specifically, it is designed to handle multiple data transfer speeds (low, full, high, and SuperSpeed) within a single unified standard. This makes it more efficient in managing computational and power resources, a feature particularly beneficial for mobile devices with limited power capabilities like tablets and smartphones. Additionally, xHCI simplifies the architecture needed to support a mixture of low-speed and high-speed devices, which streamlines the development of drivers and system software.
xHCI marks a significant improvement over its predecessors, the Open Host Controller Interface (OHCI) and the Universal Host Controller Interface (UHCI), in several key ways:
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