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USB3803 Datasheet(PDF) 54 Page - Microchip Technology |
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USB3803 Datasheet(HTML) 54 Page - Microchip Technology |
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54 / 99 page  USB3803 DS00001691B-page 54 2014-2015 Microchip Technology Inc. 7.3.8 ENDPOINT DESCRIPTOR (SINGLE-TT) The following table provides the endpoint descriptor values for Single-TT operation. 7.3.9 INTERFACE DESCRIPTOR (MULTI-TT) The following table provides interface descriptor values for High-Speed, Multi-TT operation. 7 InterfaceProtocol 1 xxh Protocol xx = 00h if bNumInterfaces = 01h (Single-TT). xx = 01h if bNumInterfaces = 02h (Multi-TT). 8 Interface 1 00h Index of the string descriptor describing this interface (strings not supported). TABLE 7-12: 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). Note: This is only available if Multi-TT is reported in the other Other-Speed Configuration Descriptor. TABLE 7-13: INTERFACE DESCRIPTOR (HIGH-SPEED, MULTI-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 01h Value used to select this alternate setting for the inter- face. 4 NumEndpoints 1 01h Number of endpoints used by this interface (not includ- ing endpoint 0). 5 InterfaceClass 1 09h Hub class code. 6 InterfaceSubclass 1 00h Subclass code. 7 InterfaceProtocol 1 02h Protocol code. 8 Interface 1 00h Index of the string descriptor describing this interface (strings not supported) TABLE 7-11: INTERFACE DESCRIPTOR (HIGH-SPEED, SINGLE-TT) (CONTINUED) Offset Field Size Value Description |
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