SMSC USB4640i ユーザーズマニュアル

High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

Revision 1.0 (06-01-09)

40

SMSC USB4640/USB4640i

7:0

DYN_NUM_LUN

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 

value and icons will be configured per the default configuration.

3:0

DEV_LUN_MAP

These registers map a device controller (SD/MMC, SM (

), and MS) 

to a Logical Unit Number (LUN). The device reports the mapped LUNs to 

the USB host in the USB descriptor during enumeration. The icon installer 

associates custom icons with the LUNs specified in these fields. 

Setting a register to "FF" indicates that the device is not mapped. Setting all 

of the DEV_LUN_MAP registers for all devices to "FF" forces the use of the 

default mapping configuration. Not all configurations are valid. Valid 

configurations depend on the hardware, packaging, and OEM board layout. 

The number of unique LUNs mapped must match the value in the 

.

2:0

Reserved

Reserved.

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). 

7:0

VID_MSB

Most 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).