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Chapter 1
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Figure 1-3 USB device structure
1-4-2 DEVICE STATES
The USB 2.0 specification defines six different states and are detailed in Table 1-2.
Device States
Attached
Powered
Default
Address
Description
The device is in the Attached state when it is connected to the host or a hub port. The
hub must be connected to the host or to another hub.
A device is considered in the Powered state when it starts consuming power from the
bus. Only bus-powered devices use power from the host. Self-powered devices are in
the Powered state after port attachment.
After the device has been powered, it should not respond to any request or
transactions until it receives a reset signal from the host. The device enters in the
Default state when it receives a reset signal from the host. In the Default state, the
device responds to standard requests at the default address 0.
During enumeration, the host assigns a unique address to the device. When this
occurs, the device moves from the Default state to the Address state.
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