USB2642 datasheet(37/56 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001578C-page 37

USB2642

7.4.3.31

F5h: Reserved

7.4.3.32

F6h: SD1/2 Timeout Options

7.4.3.33

F7h-FBh: Reserved

7.4.3.34

FCh-FFh: Non-Volatile Storage Signature

7.4.4

INTERNAL FLASH MEDIA CONTROLLER EXTENDED CONFIGURATIONS

Enable Registers 100h - 17Fh by setting bit 7 of bmAttribute.

7.4.4.1

100h-106h: Combo LUN 0 Identifier String

7.4.4.2

107h-10Dh: Combo LUN 1 Identifier String

Bit

Name

Description

7:0

rsvd

Bit

Name

Description

7:0

MEDIA_SETTINGS

The SD1 and SD2 Timeout Options:

Bit 0 : rsvd

Bit 1 : rsvd

Bits 2-4 : SD1 timeout

Bits 5-7 : rsvd

A value of 001b equates to a timeout of 0.81 seconds, where 010b indicates

an additional 0.81 seconds for a total of 1.62, and so on. The maximum

value is 000b (default), which indicates a total timeout of 6.5 seconds.

Bit

Byte Name

Description

7:0

rsvd

Byte

Name

Description

4:0

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.

Byte

Name

Description

6:0

CLUN0_ID_STR

If the LUN to device mapping bytes have configured this LUN to be a combo

LUNs, then these strings will be used to identify the LUN rather than the

device identifier strings.

Byte

Name

Description

6:0

CLUN1_ID_STR

If the LUN to device mapping bytes have configured this LUN to be a combo

LUNs, then these strings will be used to identify the LUN rather than the

device identifier strings.

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