- WHAT IS USB XHCI COMPLIANT HOST CONTROLLER SERIAL
- WHAT IS USB XHCI COMPLIANT HOST CONTROLLER DRIVERS
- WHAT IS USB XHCI COMPLIANT HOST CONTROLLER DRIVER
- WHAT IS USB XHCI COMPLIANT HOST CONTROLLER WINDOWS
The miniport driver, after it is loaded, loads the port driver, Usbport.sys. When the system detects host controller hardware, it loads one of these miniport drivers.
WHAT IS USB XHCI COMPLIANT HOST CONTROLLER DRIVERS
It consists of the port driver, Usbport.sys, and one or more of three miniport drivers that run concurrently.
WHAT IS USB XHCI COMPLIANT HOST CONTROLLER DRIVER
The USB 2.0 driver stack is designed to facilitate high-speed USB devices as defined in the USB 2.0 specification.Īt the bottom of the USB driver stack is the host controller driver.
WHAT IS USB XHCI COMPLIANT HOST CONTROLLER WINDOWS
The drivers in the USB 2.0 driver stack ship in Windows XP with SP1 and later versions of the Windows operating system. Windows loads the USB 2.0 driver stack for devices that are attached to eHCI, oHCI, or uHCI controllers. After parsing the information, the hub driver submits the request to the USB host controller extension or further processing. For instance, the hub driver parses a select-configuration request to determine which endpoints will be configured by the request. In addition to hub management, the hub driver also performs preliminary checks and processing of certain requests sent by the USB client driver layer. The hub driver relies on KMDF for power management and PnP functions. Device enumeration and hub management in the new driver are implemented through a set of state machines. Windows loads the hub driver as the FDO in the hub device stack.
Creates physical device objects (PDOs) for the enumerated devices and hubs. Enumerates devices and other hubs attached to their downstream ports. The hub driver primarily performs these tasks: The new hub driver, in the USB driver stack for 3.0 devices, uses the KMDF driver model. Implements features that are configurable by the client driver, like chained MDLs, streams, and so on. Manages and control the operations of the root hub associated with the host controller. Provides KMDF event callback routines to the xHCI driver. Provides USB-specific objects to the xHCI driver. The responsibilities of the USB host controller extension driver are: The xHCI driver, when ready for processing, retrieves the request from the queue. Upon receiving an I/O request, the host controller extension validates the request and then forwards the request to the proper KMDF queue associated with the target endpoint. All I/O requests initiated by upper drivers reach the host controller extension driver before the xHCI driver. The USB host controller extension serves as a common abstracted interface to the hub driver, provides a generic mechanism for queuing requests to the host controller driver, and overrides certain selected functions. The new driver is extensible and is designed to support other types of host controller drivers that are expected to be developed in the future. The USB host controller extension driver (an extension to KMDF) is the new extension to the underlying class-specific host controller driver, such as the xHCI driver. USB host controller extension (Ucx01000.sys) Windows loads the xHCI driver as the function device object (FDO) in the device stack for the host controller. The new driver was written by using Kernel Mode Driver Framework (KMDF) interfaces and uses KMDF for all controller power management and PnP events. The xHCI driver is new in Windows 8 and is not an extension of the eHCI miniport driver that was available in earlier versions of the operating system. It also controls the xHCI controller device slots and endpoint contexts. After completing a transfer, the driver handles transfer completion events from the hardware and propagates the events up the driver stack. The responsibilities of the xHCI driver include initializing MMIO registers and host memory-based data structures for xHCI controller hardware, mapping transfer requests from upper layer drivers to Transfer Request Blocks, and submitting the requests to the hardware. The xHCI driver is the USB 3.0 host controller driver. USB 3.0 host controller driver (Usbxhci.sys) The KMDF driver model reduces complexity and improves stability. Microsoft created the new drivers by using Kernel Mode Driver Framework (KMDF) interfaces. USB common class generic parent driver (Usbccgp.sys). USB host controller extension (Ucx01000.sys). USB 3.0 host controller driver (Usbxhci.sys). The USB 2.0 driver stack ships in Windows XP with Service Pack 1 (SP1) and later versions of the Windows operating system. Windows loads the USB 3.0 driver stack when a device is attached to an xHCI controller. The diagram shows separate USB driver stacks for USB 2.0 and USB 3.0. The following figure shows the architectural block diagram of the USB driver stack for Windows 8. WHAT IS USB XHCI COMPLIANT HOST CONTROLLER SERIAL
This topic provides an overview of the Universal Serial Bus (USB) driver stack architecture.
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