USB82642 datasheet(40/64 Pages) MICROCHIP

40 / 64 page

USB82642

DS60001253F-page 40

 2012-2021 Microchip Technology Inc.

7.5.4.7

146h: Dynamic Number of Extended LUNs

7.5.4.8

147h-14Bh: LUN to Device Mapping

7.5.4.9

14Ch-17Bh: Reserved

7.5.4.10

17Ch -17Fh: Non-Volatile Storage Signature for Extended Configuration

Bit

Name

Description

7:0

DYN_NUM_

EXT_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 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

value and icons will be configured per the default configuration.

Byte

Name

Description

4:0

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

value and icons will be configured per the default configuration.

Byte

Name

Description

47:0

rsvd

Byte

Name

Description

3:0

NVSTORE_SIG2

This signature is used to verify the validity of the data in the upper 256 bytes if a

512-byte EEPROM is used, otherwise this bank is a read-only configuration

area. The signature must be set to ecf1.

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