MS OS Extended Configuration Descriptor Request If the port status indicates a newly connected device, the USB hub driver will use the following sequences of steps to enumerate the device: In this post I will provide a detailed description of the enumeration process used by the Windows 7 core USB driver stack - from the point the stack detects a presence of device to the point it indicates to the PnP manager that a new device has arrived.ĭevice enumeration for a USB port begins when the hub indicate a connect status change via the hub’s interrupt endpoint.
I am a software developer on the Windows USB team.
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