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Physical Interface and Power Management
TRANSFER COMPLETION
The notion of transfer completion is only relevant for control, bulk and interrupt transfers as
isochronous transfers occur continuously and periodically by nature. In general, control,
bulk and interrupt endpoints must transmit data payload sizes that are less than or equal to
the endpoint’s maximum data payload size. When a transfer’s data payload is greater than
the maximum data payload size, the transfer is split into several transactions whose payload
is maximum-sized except the last transaction which contains the remaining data. A transfer
is deemed complete when:
■
The endpoint transfers exactly the amount of data expected.
■
The endpoint transfers a short packet, that is a packet with a payload size less than the
maximum.
■
The endpoint transfers a zero-length packet.
1-3 PHYSICAL INTERFACE AND POWER MANAGEMENT
USB transfers data and provides power using four-wire cables. The four wires are: V bus , D + ,
D - and Ground. Signaling occurs on the D + and D - wires.
1-3-1 SPEED
The USB 2.0 specification defines three different speeds.
■
Low Speed: 1.5 Mb/s
■
Full Speed: 12 Mb/s
■
High Speed: 480 Mb/s
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