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参数资料
| 型号： | ST5481TQF7 |
| 厂商： | 意法半导体 |
| 英文描述： | L.O.U.I.S - LOW COST USB ISDN SOLUTION |
| 中文描述： | 圣路易斯-低成本USB综合业务数字网解决方案 |
| 文件页数： | 11/18页 |
| 文件大小： | 167K |
| 代理商： | ST5481TQF7 |
ST5481
11/18
USB Descriptors
During the USB request GET DESCRIPTOR, the device returns these values from an internal 256 byte
ROM.
Table 2 :
Device Descriptor
Notes 1. This word represents the hardware-software association. The value is programmable through 4 of the 16 bits. the lower bits values
are defined by pins ID3 to ID0.
2. This word represents the silicon hardware. The lower 8-bit value is defined at metal layer. The other 8 bits are written into the ROM
at diffusion layer.
Table 3 :
Interface 0 as 0 Descriptor
Note
1. Theses words are defined by a transcoding of the pins CFG0, CFG1, RPSM : see power management section for coding of these
pins.
ROM addr
Offset
Field
Size
Value
Description
08
0
bLengh
1
12h
Size of this descriptor in bytes
09
1
bDescriptorType
1
01h
Device Descriptor type
0A
2
bcdUSB
2
0101h
USB spec release number 1.1
0C
4
bDeviceClass
1
FFh
Vendor Specific Class code
0D
5
bDeviceSubClass
1
01h
Vendor specific ISDN MODEM subclass
0E
6
bDeviceProtocol
1
01h
Vendor specific ISDN SOFT MODEM control protocol
0F
7
bMaxPacketSize0
1
08h
Max packet size for EP0
10
8
idVendor
2
0483h
ST id vendor
12
10
idProduct
2
481xh
Application id product
1
14
12
bcdDevice
2
01xxh
Device release
2
16
14
iManufacturer
1
00h
No specific manufacturer registred
17
15
iProduct
1
01h
product id String descriptor index 1
18
16
iSerialNumber
1
00h
No specific serial number registred
19
17
bNumConfigurations
1
01h
Number of possible configurations
ROM addr
Offset
Field
Size
Value
Description
20
0
bLengh
1
09h
Size of this descriptor in bytes
21
1
bDescriptorType
1
02h
Configuration Descriptor type
22
2
wTotalLengh
2
00CFh
Total length of data byte returned for this configuration
24
4
bNumInterface
1
01h
number of interfaces supported by this configuration
25
5
bConfigurationValue
1
01h
value used to select this conf.
26
6
iConfiguration
1
00h
No specific string descriptor for this configuration
27
7
bmAttributes
1
XXh
Self powered and remote wake-up abilities
programmable
1
28
8
MaxPower
1
XXh
max consumption programmable
1
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