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8.1 USB Overview
The USB (Universal Serial Bus) is suitable for connecting personal computers and external devices such as audio
equipment, keyboards, pointing devices, and telephones. Two data transfer rates, 12 Mbps and 1.5 Mbps, are
provided.
Plug & Play can also be realized.
Figure 8-1 shows an example of USB connection to a desktop PC. The USB consists of the host controller
installed in the PC, hubs installed for port expansion and connection, and functions installed at bus ends. These
functions are called endpoints and are the data transfer destinations or data transfer sources in the USB.
Hub
Function
(CD-ROM)
CHAPTER 8
USB FUNCTION
Figure 8-1. USB Bus Topology (Desktop Type PC)
Host
Host (Root Tier)
RootHub
Hub
Function
(monitor)
Hub
Function
(modem)
Function
Hub
(keyboard)
Function
Function
User's Manual U12978EJ3V0UD
Tier 1
Tier 2
Function
(mouse)
Tier 3
Tier 4
97
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