USB2250 datasheet(29/43 Pages) MICROCHIP

29 / 43 page

 2009 - 2015 Microchip Technology Inc.

DS00002005A-page 29

USB2250/50i/51/51i

7.2.5.6

CEh-D2h: Inquiry Product String

7.2.5.7

D3h: Dynamic Number of LUNs

7.2.5.8

D4h-D7h: Device to LUN Mapping

7.2.5.9

D8h-FBh: Not Applicable

7.2.5.10

FCh-FFh: Non-Volatile Storage Signature

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.

Byte

Name

Description

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.

Byte

Name

Description

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 Section

7.2.5.7, "D3h: Dynamic Number of LUNs," on page 29.

Byte

Name

Description

35:0

Not Applicable

Not Applicable.

Byte

Name

Description

3:0

NVSTORE_SIG

This signature is used to verify the validity of the data in the first 256 bytes of

the configuration area. The signature must be set to ‘ATA2’ for

USB2250/50i/51/51i.

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