USB2642 datasheet(27/56 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001578C-page 27

USB2642

7.4.3.3

CEh-D2h: Inquiry Product String

7.4.3.4

D3h: Dynamic Number of LUNs

7.4.3.5

D4h-D7h: LUN to Device Mapping

7.4.3.6

D8h-DAh: Reserved

7.4.3.7

DBh-DDh: SD/MMC Bus Timing Control

7.4.3.8

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

manufacturer 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

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

values and LUNs will be configured per the default configuration.

Bit

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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