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Chapter 1
The host learns about the device capabilities during enumeration, which allows the host
operating system to load a specific driver for a particular USB device. The maximum
number of peripherals that can be attached to a host is 127, including the root hub.
Figure 1-1 Bus topology
1-1-2 USB HOST
The USB host communicates with the devices using a USB host controller. The host is
responsible for detecting and enumerating devices, managing bus access, performing error
checking, providing and managing power, and exchanging data with the devices.
1-1-3 USB DEVICE
A USB device implements one or more USB functions where a function provides one
specific capability to the system. Examples of USB functions are keyboards, webcam,
speakers, or a mouse. The requirements of the USB functions are described in the USB class
specification. For example, keyboards and mice are implemented using the Human
Interface Device (HID) specification.
USB devices must also respond to requests from the host. For example, on power up, or
when a device is connected to the host, the host queries the device capabilities during
enumeration, using standard requests.
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