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Chapter 1
 
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Figure 1-2 USB data flow
F1-2(1)
The host software uses standard requests to query and configure the device
using the default pipe. The default pipe uses endpoint zero (EP0).
F1-2(2)
USB pipes allow associations between the host application and the device’s
endpoints. Host applications send and receive data through USB pipes.
F1-2(3)
The host controller is responsible for the transmission, reception, packing and
unpacking of data over the bus.
F1-2(4)
Data is transmitted via the physical media.
F1-2(5)
The device controller is responsible for the transmission, reception, packing
and unpacking of data over the bus. The USB controller informs the USB
device software layer about several events such as bus events and transfer
events.
F1-2(6)
The device software layer responds to the standard request, and implements
one or more USB functions as specified in the USB class document.
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