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USB3503 数据表(PDF) 39 Page - Microchip Technology |
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USB3503 数据表(HTML) 39 Page - Microchip Technology |
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39 / 73 page  2011-2015 Microchip Technology Inc. DS00001584B-page 39 USB3503 7.0 USB DESCRIPTORS A customer can indirectly affect which descriptors are reported via one of two methods. The two methods are: Internal Default ROM Configuration, or direct load through the serial port interface. The Hub will not electrically attach to the USB until after it has loaded valid data for all user- defined descriptor fields (either through Internal Default ROM, or serial port). 7.1 USB Bus Reset In response to the upstream port signaling a reset to the Hub, the Hub does the following: Note 7-1 The Hub does not propagate the upstream USB reset to downstream devices. • Sets default address to 0. • Sets configuration to: Unconfigured. • Negates PRTPWR[3:1] register for all downstream ports. • Clears all TT buffers. • Moves device from suspended to active (if suspended). • Complies with Section 11.10 of the USB 2.0 Specification for behavior after completion of the reset sequence. The Host then configures the Hub and the Hub's downstream port devices in accordance with the USB Specification. 7.2 Hub Attached as a High-Speed Device (Customer-Configured for Single-TT Support Only) The following tables provide descriptor information for Customer-Configured Single-TT-Only Hubs attached for use with High-Speed devices. 7.2.1 STANDARD DEVICE DESCRIPTOR The following table provides device descriptor values for High-Speed operation. TABLE 7-1: DEVICE DESCRIPTOR 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 01h 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 15 Product 1 yyh If STRING_EN =0 Optional string is not supported, and yy = 00. If STRING_EN = 1, String support is enabled, and yy = 02 |
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