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Device Structure and Enumeration
Device States
Configurated
Suspended
Description
After the host assigns an address to the device, the host must select a configuration.
After the host selects a configuration, the device enters the Configured state. In this
state, the device is ready to communicate with the host applications.
The device enters in Suspended state when no traffic has been seen in the bus for a
specific period of time. The device retains the address assigned by the host in the
Suspended state. The device returns to the previous state after traffic is present in the
bus.
Table 1-2 USB Device States
1-4-3 ENUMERATION
Enumeration is the process where the host configures the device and learns about the
device’s capabilities. The host starts enumeration after the device is attached to one of the
root or external hub ports. The host learns about the device’s manufacturer, vendor/product
IDs and release versions by sending a Get Descriptor request to obtain the device descriptor
and the maximum packet size of the default pipe (control endpoint 0). Once that is done,
the host assigns a unique address to the device which will tell the device to only answer
requests at this unique address. Next, the host gets the capabilities of the device by a series
of Get Descriptor requests. The host iterates through all the available configurations to
retrieve information about number of interfaces in each configuration, interfaces classes,
and endpoint parameters for each interface and will lastly finish the enumeration process by
selecting the most suitable configuration.
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