xHCI
Definition
eXtensible Host Controller Interface, the standard interface for modern USB controllers.
Detailed explanation
xHCI means eXtensible Host Controller Interface, the standardized register and software interface for modern USB host controllers. One xHCI controller can manage USB 2 and newer transfer speeds through logical ports. Windows usually supplies the host-controller driver while hubs and device classes use additional drivers. The controller uses rings of transfer request blocks to schedule work and reports completion through event rings. USB speed branding belongs to the attached device and link, so an xHCI controller can simultaneously host low-speed input, high-speed audio, and SuperSpeed storage functions.
Where you are likely to see it
This term usually appears in Device Manager, Windows recovery tools, Event Viewer, or the installation details for a device package. The definition above gives the short meaning; the detailed explanation describes the term's role in the operating system and hardware stack.
Device status, hardware IDs, and event text identify which Windows subsystem produced a label. This glossary is informational and does not provide repair, installation, or technical-support services.
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