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Overview
A CDC device must have at least one CCI and zero or more DCIs. One CCI and any
subordinate DCI together provide a feature to the host. This capability is also referred to as
a function. In a CDC composite device, you could have several functions. Hence, the device
would be composed of several sets of CCI and DCI(s) as shown in Figure 8-1.
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Figure 8-1 CDC Composite Device
A CDC device is likely to use the following combination of endpoints:
■
A pair of control IN and OUT endpoints called the default endpoint.
■
An optional bulk or interrupt IN endpoint.
■
A pair of bulk or isochronous IN and OUT endpoints.
Table 8-1 indicates the usage of the different endpoints and by which interface of the CDC
they are used:
Endpoint
Control IN
Direction
Device-to-host
Interface
CCI
Usage
Standard requests for enumeration, class-specific
requests, device management and optionally call
management.
Control OUT
Host-to-device
CCI
Standard requests for enumeration, class-specific
requests, device management and optionally call
management.
Interrupt or bulk IN
Device-to-host
CCI
Events notification, such as ring detect, serial line
status, network status.
Bulk or isochronous IN
Bulk or isochronous OUT
Device-to-host
Host-to-device
DCI
DCI
Raw or formatted data communication.
Raw or formatted data communication.
Table 8-1 CDC Endpoint Usage
117
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