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USB82642 数据表(PDF) 28 Page - Microchip Technology |
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USB82642 数据表(HTML) 28 Page - Microchip Technology |
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28 / 64 page ![]() USB82642 DS60001253F-page 28 2012-2021 Microchip Technology Inc. 7.5.3.3 CEh-D2h: Inquiry Product String 7.5.3.4 D3h: Dynamic Number of LUNs 7.5.3.5 D4h-D7h: LUN to Device Mapping 7.5.3.6 D8h-DAh: Reserved 7.5.3.7 DBh-DDh: SD/MMC Bus Timing Control 7.5.3.8 DEh: Vendor ID (LSB) Byte Name Description 4:0 INQ_PRD_STR If bit 4 of the 1st attribute byte is set, the device will use these strings in response to a USB inquiry command, instead of the USB descriptor manufac- turer and product ID strings. Bit Name Description 7:0 DYN_NUM_LUN This byte is used to specify the number of LUNs the device exposes to the host. These bytes are also used for icon sharing by assigning more than one LUN to a single icon. This is used in applications where the device utilizes a combo socket and the OEM wishes to have only a single icon displayed for one or more interfaces. If this field is set to FF, the program assumes that you are using the default value and icons will be configured per the default configuration. Byte Name Description 3:0 LUN_DEV_MAP These bytes are used to specify the number of LUNs the device exposes to the host. These bytes are also used for icon sharing by assigning more than one LUN to a single icon. This is used in applications where the device uti- lizes a combo socket and the OEM wishes to have only a single icon dis- played for one or more interfaces. If this field is set to FF, the program assumes that you are using the default values and LUNs will be configured per the default configuration. Byte Name Description 2:0 rsvd Byte Name Description 2:0 SD_MMC_BUS_ TIMING The values for these bytes are set internally and must not be altered. Bit Name Description 7:0 VID_LSB Least Significant Byte of the Vendor ID. This is a 16-bit value that uniquely identifies the vendor of the user device (assigned by USB Implementer’s Forum). |
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