LOUIS Ver la hoja de datos (PDF) - STMicroelectronics
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LOUIS Datasheet PDF : 18 Pages
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ST5481
USB Descriptors
During the USB request GET DESCRIPTOR, the device returns these values from an internal 256 byte
ROM.
Table 2 : Device Descriptor
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
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
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
Self powered and remote wake-up abilities
XXh programmable 1
28
8 MaxPower
1
XXh max consumption programmable 1
Note 1. Theses words are defined by a transcoding of the pins CFG0, CFG1, RPSM : see power management section for coding of these
pins.
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