USB82640 datasheet(28/64 Pages) MICROCHIP

28 / 64 page

USB82640

DS60001312A-page 28

 2010-2015 Microchip Technology Inc.

7.3.2.11

A4h-A5h: LUN 0 Power Configuration

The USB82640 has one internal FET which can be utilized for card power. Please reference to Section 7.3.4.9, "14Ch-

17Bh: Reserved," on page 42 for information on the other internal FET. The settings are stored in NVSTORE and pro-

vide the following features:

A card can be powered by an external FET or by an internal FET.

The power limit is set to 200 mA (default) for the internal FET but can be set to 100 mA.

Each media uses two bytes to store its LUN power configuration. Bit 3 selects between internal or external. For internal

FETs bits 0 through 2 are used for the power limit. Only 2 of the possible 8 values are currently specified.

7.3.2.12

A6h-A7h: Reserved

7.3.2.13

A8h: LED Blink Interval (1 byte)

7.3.2.14

A9h: Blink Duration

TABLE 7-4:

FET CONFIGURATION

FET

Type

Bits

Bit Type

Description

0FET Lo

Byte

3:0

Low Nibble

rsvd

7:4

High Nibble

2FET Hi

Byte

3:0

Low Nibble

0000b Disabled

0001b External FET enabled

1000b Internal FET with 100 mA power limit

1010b Internal FET with 200 mA power limit

7:4

High Nibble

rsvd

BYTE

Name

Description

1:0

rsvd

Bit

Name

Description

7:0

LED_BLK_INT

The blink rate is programmable in 50 ms intervals. The high bit (7) indicates

an idle state:

: off

: on

The remaining bits (6:0) are used to determine the blink interval up to a max

of 128 x 50 ms.

Bit

Name

Description

7:0

LED_BLK_DUR

LED Blink After Access

This byte is used to designate the number of seconds that the GPIO 1 LED

will continue to blink after a drive access. Setting this byte to 05 will cause the

GPIO 1 LED to blink for 5 seconds after a drive access.

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