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PC
Keyboard
Printer
Digital camera
（Host）
Mouse
Hub
Web camera
Hub
USB memory
Figure 4.3-1 USB Connection Example
4.4
Plug
Each end of the USB has a plug with a different shape. One end is called the A plug, the other
the B plug. A smaller connector is used on embedded devices and is called a Mini-A plug and
Mini-B plug, to distinguish from the standard plug size. The cable supplied with this board has an
A plug and a Mini-B plug.
The USB device on a host is always equipped with an A plug. The plugs are shaped differently
to prevent incorrect insertion.
A plug
B plug
Figure 4.4-1 USB connector shapes used on this board
Mini-B plug
Host
A
B
Function
A
A
B
B
Function
Hub
A
A
B
B
Function
Function
Figure 4.4-2 Relation between connections and connectors
57
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