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): 76/92頁
文件大?。?/td> 317K
代理商: TUSB3410VF
11
6
Table 11
5. String Descriptor (Continued)
OFFSET
FIELD
SIZE
VALUE
DESCRIPTION
72
2
e
,0x00
74
2
v
,0x00
76
2
I,0x00
78
2
c
,0x00
80
2
e
,0x00
82
bLength
1
34
Size of string 3 descriptor in bytes
84
bDescriptorType
1
0x03
STRING descriptor type
86
bString
2
r0,0x00
UNICODE
88
2
r1,0x00
R0 to rF are BCD of SERNUM0 to
90
2
r2,0x00
SERNUM7 registers. 16 digit hex
92
2
r3,0x00
16 digit hex numbers are created from
94
2
r4,0x00
SERNUM0 to SERNUM7 registers
96
2
r5,0x00
98
2
r6,0x00
100
2
r7,0x00
102
2
r8,0x00
104
2
r9,0x00
106
2
rA,0x00
108
2
rB,0x00
110
2
rC,0x00
112
2
rD,0x00
114
2
rE,0x00
116
2
rF,0x00
11.4 External Device Header Format
The header can be restored in various storage devices such as ROM, parallel/serial EEPROM, I
2
C, or flash ROM.
A valid header should contain a product signature and one or more descriptor blocks. The descriptor block contains
the descriptor prefix and content. In the descriptor prefix, the data type, size, and checksum are specified to describe
the content. The descriptor content contains the necessary information for the bootcode to process.
The header processing routine always counts from the first descriptor block until the desired block number is reached.
The header reads in descriptor prefix with the size of 4 bytes. This prefix contains the type of block, size, and
checksum. For example, if the bootcode would like to find the position on third descriptor block, it reads in the first
descriptor prefix, calculates the position on the second descriptor prefix based on the size specified in the prefix.
bootcode, then repeats the same calculation to find out the position of the third descriptor block.
Note that the header-processing routine of the TUSB3410 only supports the I
2
C device. No other storage device
should be used to store header information.
11.4.1 Product Signature
The product signature should be stored at the first 2 bytes of storage device. These 2 bytes should match the product
number. The order of these 2 bytes should be the LSB first and then the MSB. For example, UMP (TUSB5152) is
0x5152. Therefore, the first byte should be 0x52 and the second byte should be 0x51.
The TUSB3410 bootcode searches the first 2 bytes of the I
2
C device. If the first 2 bytes are not 0x10 and 0x34, the
bootcode skips the header processing.
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