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RM0319 数据表(PDF) 47 Page - STMicroelectronics |
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RM0319 数据表(HTML) 47 Page - STMicroelectronics |
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47 / 368 page  RM0319 BootROM Doc ID 022640 Rev 3 47/368 3. Interface descriptors: Each device has a single data interface with no possible alternates. . 4. Endpoint descriptors: A device supports the following endpoints. a) Bulk OUT endpoint. Used for transfer of data from host to device. . b) Bulk IN endpoint. Used for transfer of data from device to host. Table 11. Interface descriptor Offset Field Size Value 0 bLength Byte 0x09 1 bDescriptorType Byte 0x04 2 bInterfaceNumber Byte 0x00 3 bAlternateSetting Byte 0x00 4 bNumEndpoints Byte 0x02 5 bInterfaceClass Byte 0x00 6 interfaceSubClass Byte 0x00 7 bInterfaceProtocol Byte 0x02 8 iInterface Byte 0x01 Table 12. Bulk OUT endpoint descriptor Offset Field Size Value 0 bLength Byte 0x07 1 bDescriptorType Byte 0x05 2 bEndpointAddress Byte 0x02 3 bmAttributes Byte 0x02 4 wMaxPacketSize Word 0x040 6 bInterval Byte 0x00 Table 13. Bulk IN endpoint descriptor Offset Field Size Value 0 bLength Byte 0x07 1 bDescriptorType Byte 0x05 2 bEndpointAddress Byte 0x81 3 bmAttributes Byte 0x02 4 wMaxPacketSize Word 0x040 6 bInterval Byte 0x00 |
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