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Device Structure and Enumeration
INTERFACE
A USB interface or a group of interfaces provides information about a function or class
implemented by the device. An interface can contain multiple mutually exclusive settings
called alternate settings . The device uses an interface descriptor to inform the host about a
specific interface’s capabilities. Each interface descriptor contains a class, subclass, and
protocol codes defined by the USB-IF, and the number of endpoints required for a
particular class implementation.
ALTERNATE SETTINGS
Alternate settings are used by the device to specify mutually exclusive settings for each
interface. The default alternate settings contain the default settings of the device. The device
also uses an interface descriptor to inform the host about an interface’s alternate settings.
ENDPOINT
An interface requires a set of endpoints to communicate with the host. Each interface has
different requirements in terms of the number of endpoints, transfer type, direction,
maximum packet size, and maximum polling interval. The device sends an endpoint
descriptor to notify the host about endpoint capabilities.
Figure 1-3 shows the hierarchical organization of a USB device. Configurations are grouped
based on the device’s speed. A high-speed device might have a particular configuration in
both high-speed and low/full speed.
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