What does xhci hand-off mean?

To put it simply, XHCI is the latest host controller interface developed by Intel. The 100 series motherboards corresponding to Intel's sixth-generation Skylake processors are widely used. They support USB3.0 interfaces and are also compatible with USB2.0.

EHCI stands for Enhanced Host Controller Interface in English. It is an enhanced host controller interface specification that describes the register-level interface of a Universal Serial Bus USB2.0 version of the host controller. The EHCI specification includes a description of the hardware/software interface between system software and host controller hardware, primarily for hardware component designers, system integrators, and device driver (software) development.

Before understanding EHCI, you can first understand HCI (Host Controller Interface), which is the host control interface. HCI is a register-level interface that allows a host controller (such as the southbridge of Motherboard) to communicate with peripherals such as (USB, FireWire, and Bluetooth).

When the peripheral device is connected to the PC, the system first initializes, HCI starts threads (threads) reading and writing, and establishes a connection with the peripheral device. Next, HCI will reset and then read the cache size of the peripheral and establish communication with the peripheral. EHCI (Enhanced Host Controller Interface) is an enhanced (Enhanced) version of HCI.

To put it simply, EHCI is what is commonly known as the USB2.0 interface. If your computer supports USB2.0, then all the USB devices you use are connected to it.

EHCI and XHCI are both host controller interfaces. The former is aimed at the USB2.0 interface, while the latter is developed based on the latest USB3.0 and is also compatible with USB2.0. Simply put, XHCI is Enhanced version of EHCI.

It is worth mentioning that since the Win7 native system does not have an XHCI driver, the USB mouse and keyboard will fail when installing the Win7 system on 100 series motherboards. However, the Win8 and Win10 native systems have built-in XHCI drivers. So this won't happen.

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