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USB3503 数据表(PDF) 41 Page - Microchip Technology |
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USB3503 数据表(HTML) 41 Page - Microchip Technology |
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41 / 73 page  2011-2015 Microchip Technology Inc. DS00001584B-page 41 USB3503 7.2.3 INTERFACE DESCRIPTOR (SINGLE-TT) The following table provides interface descriptor values for High-Speed, Single-TT operation. 7.2.4 ENDPOINT DESCRIPTOR (SINGLE-TT) The following table provides endpoint descriptor values for Single-TT operation. 7.3 Hub Attached as a High-Speed Device (Customer-Configured as Multi-TT Capable) The following tables provide descriptor information for Customer-Configured Multi-TT High-Speed devices. 7.3.1 STANDARD DEVICE DESCRIPTOR The following table provides device descriptor values for High-Speed operation. TABLE 7-3: INTERFACE DESCRIPTOR (HIGH-SPEED, SINGLE-TT) Offset Field Size Value Description 0 Length 1 09h Size of this Descriptor. 1 DescriptorType 1 04h Interface Descriptor Type. 2 InterfaceNumber 1 00h Number of this interface. 3 AlternateSetting 1 00h Value used to select this alternate setting for the interface. 4 NumEndpoints 1 01h Number of endpoints used by this interface (not including endpoint 0). 5 InterfaceClass 1 09h Hub class code. 6 InterfaceSubclass 1 00h Subclass code. 7 InterfaceProtocol 1 00h Single-TT. 8 Interface 1 00h Index of the string descriptor describing this interface (strings not supported). TABLE 7-4: ENDPOINT DESCRIPTOR (FOR STATUS CHANGE ENDPOINT, SINGLE-TT) Offset Field Size Value Description 0 Length 1 07h Size of this Descriptor. 1 DescriptorType 1 05h Endpoint Descriptor Type. 2 EndpointAddress 1 81h The address of the endpoint on the USB device. 3 Attributes 1 03h Describes the endpoint’s attributes. (interrupt only, no synchronization, data endpoint). 4 MaxPacketSize 2 0001h Maximum packet size for this endpoint. 6 Interval 1 0Ch Interval for polling endpoint for data transfers (Maximum Possible). TABLE 7-5: DEVICE DESCRIPTOR (HIGH-SPEED) Offset Field Size Value Description 0 Length 1 12 Size of this Descriptor 1 DescriptorType 1 01h Device Descriptor Type. 2 USB 2 0200h USB Specification Release Number. 4 DeviceClass 1 09h Class code assigned by USB-IF for Hubs. 5 DeviceSubClass 1 00h Class code assigned by USB-IF for Hubs. 6 DeviceProtocol 1 02h Protocol code (Multi-TTs). 7 MaxPacketSize0 1 40h 64-byte packet size. 8 Vendor 2 user Vendor ID; Customer value defined in ROM or serial port load. 10 Product 2 user Product ID; Customer value defined in ROM or serial port load. |
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