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USB3803 数据表(PDF) 49 Page - Microchip Technology |
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USB3803 数据表(HTML) 49 Page - Microchip Technology |
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49 / 99 page  2014-2015 Microchip Technology Inc. DS00001691B-page 49 USB3803 7.2.4 ENDPOINT DESCRIPTOR The following table provides the endpoint descriptor values for Full-Speed operation. 7.3 Hub Attached as a Full-Speed Device, But is High-Speed Capable When attached as a Full-Speed device (most likely due to being connected to a Host Controller or Operating System that is not High-Speed capable), the following descriptor information applies. 7.3.1 STANDARD DEVICE DESCRIPTOR The following table provides the descriptor values for Full-Speed operation. TABLE 7-4: ENDPOINT DESCRIPTOR (FOR STATUS CHANGE ENDPOINT, FULL-SPEED) 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 FFh Interval for polling endpoint for data transfers (Maximum Possible). TABLE 7-5: DEVICE DESCRIPTOR (FULL-SPEED) Offset Field Size Value Description 0 Length 1 12h 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 00h Protocol code. 7 MaxPacketSize0 1 40h 64-byte packet size. 8 Vendor 2 user/ default Vendor ID; customer value defined in ROM or serial port load. 10 Product 2 user/ default Product ID; customer value defined in ROM or serial port load. 12 Device 2 user/ default Device ID; customer value defined in ROM or serial port load. 14 Manufacturer 1 xxh If STRING_EN =0 Optional string is not supported, and xx = 00. If STRING_EN = 1, String support is enabled, and xx = 01 |
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