One execution unit appears as a UHCI USB host controller node, and the other execution unit shows as an EHCI USB host controller node. ![]() Each execution unit appears as a device node in the Plug and Play device tree. The diagram shows one physical host controller device that has two execution units. This diagram shows an example of a USB 2.0 tree. The USB 2.0 tree contains the device nodes that represent execution units on EHCI host controller devices along with the child nodes that represent hubs and connected devices. ![]() The USB 2.0 debugger extension commands are implemented in Usbkd.dll. For more information about these three drivers, see USB host-side drivers in Windows. These commands display information from data structures maintained by drivers in the USB 2.0 driver stack. This section describes the USB 2.0 debugger extension commands.
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