USB2640 datasheet(32/60 Pages) MICROCHIP

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USB2640/USB2641

DS00001947C-page 32

 2015-2021 Microchip Technology Inc.

7.3.4.11

D3h: Dynamic Number of LUNs

7.3.4.12

D4h-D7h: Device to LUN Mapping

7.3.4.13

D8h-DDh: Reserved

7.3.5

HUB CONTROLLER CONFIGURATIONS

7.3.5.1

DEh: Vendor ID (LSB)

Bit

Byte Name

UCHAR

Description

7:0

DYN_NUM_LUN

FFh

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.

USB2640/USB2641 supports one LUN. MS, SM, and

SD/MMC are mapped to that LUN.

If this field is set to "FF", the program assumes that

you are using the default value of "04" and will display

icons for xD, MS, and SD/MMC. If this field is any

other value besides "FF", you must specify the LUN#

assignments in the boxes starting with LUN 00 and

going to (# of Icons to Display -1).

These bytes are reserved for internal use only.

Byte

Name

UCHARS

Description

3:0

DEV_LUN_MAP

FFh, FFh, FFh, FFh 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.

USB2640/USB2641 supports one LUN. MS, SM, and

SD/MMC are mapped to that LUN.

If this field is set to "FF", the program assumes that

you are using the default value of "04" and will display

icons for xD, MS, and SD/MMC. If this field is any

other value besides "FF", you must specify the LUN#

assignments in the boxes starting with LUN 00 and

going to (# of Icons to Display -1).

These bytes are reserved for internal use only.

Bit

Byte Name

Description

5:0

Reserved

For internal use only.

Bit

Byte 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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