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): 78/92頁
文件大小: 317K
代理商: TUSB3410VF
11
8
11.6.2 USB Descriptor Header
Table 11
6 contains the USB device, configuration, and string descriptors for the bootcode. The last byte is zero to
indicate the end of header.
Table 11
6. USB Descriptors Header
OFFSET
TYPE
SIZE
1
VALUE
DESCRIPTION
0
Signature0
0x10
FUNCTION_PID_L
1
Signature1
1
0x34
FUNCTION_PID_H
2
Data Type
1
0x03
USB device descriptor
3
Data Size (low byte)
1
0x12
The device descriptor is 18 bytes.
4
Data Size (high byte)
1
0x00
5
Check Sum
1
0xCC
Checksum of data below
6
bLength
1
0x12
Size of device descriptor in bytes
7
bDescriptorType
1
0x01
Device descriptor type
8
bcdUSB
2
0x0110
USB spec 1.1
10
bDeviceClass
1
0xFF
Device class is vendor-specific
11
bDeviceSubClass
1
0x00
We have no subclasses.
12
bDeviceProtocol
1
0x00
We use no protocols
13
bMaxPacketSize0
1
0x08
Maximum packet size for endpoint zero
14
idVendor
2
0x0451
USB
assigned vendor ID = TI
16
idProduct
2
0x3410
TI part number = TUSB3410
18
bcdDevice
2
0x0100
Device release number = 1.0
20
iManufacturer
1
0x01
Index of string descriptor describing manufacturer
21
iProducct
1
0x02
Index of string descriptor describing product
22
iSerialNumber
1
0x03
Index of string descriptor describing device
s serial number
23
bNumConfigurations
1
0x01
Number of possible configurations:
24
Data Type
1
0x04
USB configuration descriptor
25
Data Size (low byte)
1
0x19
25 bytes
26
Data Size (high byte)
1
0x00
27
Check Sum
1
0xC6
Checksum of data below
28
bLength
1
0x09
Size of this descriptor in bytes
29
bDescriptorType
1
0x02
CONFIGURATION Descriptor type
30
wTotalLength
2
25(0x19) =
9 + 9 + 7
Total length of data returned for this configuration. Includes the combined length of
all descriptors (configuration, interface, endpoint, and class- or vendor-specific)
returned for this configuration.
32
bNumInterfaces
1
0x01
Number of interfaces supported by this configuration
33
bConfigurationValue
1
0x01
Value to use as an argument to the SetConfiguration() request to select this
configuration
34
iConfiguration
1
0x00
Index of string descriptor describing this configuration.
35
bmAttributes
1
0xE0
Configuration characteristics
D7:
Reserved (set to one)
D6:
Self
powered
D5:
Remote Wakeup is supported
D4
0:
Reserved (reset to zero)
36
bMaxPower
1
0x64
This device consumes 100 mA.
37
bLength
1
0x09
Size of this descriptor in bytes
38
bDescriptorType
1
0x04
INTERFACE descriptor type
39
bInterfaceNumber
1
0x00
Number of interface. Zero-based value identifying the index in the array of
concurrent interfaces supported by this configuration.
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