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ST5481 Fiches technique(PDF) 11 Page - STMicroelectronics |
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ST5481 Fiches technique(HTML) 11 Page - STMicroelectronics |
11 / 18 page ST5481 11/18 USB Descriptors During the USB request GET DESCRIPTOR, the device returns these values from an internal 256 byte ROM. 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. Note 1. Theses words are defined by a transcoding of the pins CFG0, CFG1, RPSM : see power management section for coding of these pins. 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 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 XXh Self powered and remote wake-up abilities programmable 1 28 8 MaxPower 1 XXh max consumption programmable 1 |
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