參數(shù)資料
型號: TUSB3410VF
英文描述: BUS CONTROLLER
中文描述: 總線控制器
文件頁數(shù): 74/92頁
文件大?。?/td> 317K
代理商: TUSB3410VF
11
4
11.3.3 Interface Descriptor
The interface descriptor describes the number of endpoints supported by this interface as well as interface class,
subclass, and protocol.
The bootcode supports only one endpoint and use its own class. Table 11
3 lists the interface descriptor.
Table 11
3. Interface Descriptor
OFFSET
FIELD
SIZE
VALUE
DESCRIPTION
0
bLength
1
9
Size of this descriptor in bytes
1
bDescriptorType
1
4
Interface descriptor type
2
bInterfaceNumber
1
0
Number of interface. Zero-based value identifying the index in the array of concurrent
interfaces supported by this configuration.
3
bAlternateSetting
1
0
Value used to select alternate setting for the interface identified in the prior field
4
bNumEndpoints
1
1
Number of endpoints used by this interface (excluding endpoint zero). If this value is
zero, this interface only uses the default control pipe.
5
bInterfaceClass
1
0xFF
The interface class is vendor specific.
6
bInterfaceSubClass
1
0
7
bInterfaceProtocol
1
0
8
iInterface
1
0
Index of string descriptor describing this interface
11.3.4 Endpoint Descriptor
The endpoint descriptor describes the type and size of communication pipe supported by this endpoint.
The bootcode supports only one output endpoint with the size of 64 bytes in addition to control endpoint 0 (required
by all USB devices). Table 11
4 lists the endpoint descriptor.
Table 11
4. Output Endpoint1 Descriptor
OFFSET
FIELD
SIZE
VALUE
DESCRIPTION
0
bLength
1
7
Size of this descriptor in bytes
1
bDescriptorType
1
5
Endpoint descriptor type
Bit 3
0: The endpoint number
Bit 7:
Direction
0 = OUT endpoint
1 = IN endpoint
Bit 1
0: Transfer type
10 = Bulk
11 = Interrupt
2
bEndpointAddress
1
0x01
3
bmAttributes
1
2
4
wMaxPacketSize
2
64
Maximum packet size this endpoint is capable of sending or receiving when this
configuration is selected.
6
bInterval
1
0
Interval for polling endpoint for data transfers. Expressed in milliseconds.
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