4.7
Transfer methods
Several transfer methods are specified for the USB.
Table 4.7-1 below summarizes the USB transfer methods.
Table 4.7-1 USB transfer methods
Isochronous transfer
This is the most
preferred transfer method
for the USB. This transfer
Interrupt transfer
A feature of this
method is that the
delay time is
Bulk transfer
This method is
used with devices
that transfer large
Control transfer
This method is
used to send and
receive
Typical
application
method has a guaranteed
bandwidth and is used
where real-time transfers
are required, such as audio
guaranteed, thus
requiring quick
responses. Keyboards,
game pads or consoles
volumes of data,
such as printers,
scanner, digital
cameras.
configurations and
messages from the
USB device.
equipment, telephones,
etc.
< Transfer rates>
use this transfer
method.
12 Mbps
(Full Speed)
1.5 Mbps
(Low Speed)
Supported
Not supported
Supported
Supported
Supported
Not supported
Supported
Supported
< Data transfer volume per packet>
12 Mbps
(Full Speed)
1.5 Mbps
(Low Speed)
1 to 1023 bytes
Not supported
1 to 64 bytes
1 to 8 bytes
1 to 64 bytes
Not supported
1 to 64 bytes
1 to 8 bytes
< Transfer direction>
Host ->
Function
Function ->
Host
Supported
Supported
Retry request
for data errors
None
59
Yes
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