Windows loads the USB 2.0 driver stack for devices that are attached to eHCI, oHCI, or uHCI controllers. 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. This topic provides an overview of the Universal Serial Bus (USB) driver stack architecture.
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