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Chapter 7
7
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Figure 7-4 Class State Machine
F7-4(1)
A class instance has been added to a configuration, the class instance state
transitions to the ‘Init’ state. No data communication on the class endpoint(s)
can occur yet.
F7-4(2)
The host has sent the SET_CONFIGURATION request to activate a certain
configuration. The Core layer calls a class callback informing about the
completion of the standard enumeration. The class instance state transitions to
the ‘Cfg’ state. This state indicates that the device has transitioned to the
‘Configured’ state defined by the Universal Serial Bus Specification revision 2.0.
The data communication may begin. Some classes such as the MSC class may
require that the host sends some class-specific requests before the
communication on the endpoints really starts.
F7-4(3)
The Core layer calls another class callback informing that the host has sent a
SET_CONFIGURATION request with a new configuration number or with the
value 0 indicating a configuration reset, or that the device has been physically
disconnected from the host. In all these cases, the current active configuration
becomes inactive. The class instance state transitions to the ‘Init’ state. Any
ongoing transfers on the endpoints managed by the class instance have been
aborted by the Core layer. No more communication is possible until the host
sends a new SET_CONFIGURATION request with a non-null value or until the
device is plugged again to the host.
110
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