Datasheet

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

Datasheet

SMSC USB4640/USB4640i 33 Revision 1.3 (03-13-13)

DATASHEET

4.4.2 A0h-A7h: Device Power Configuration

The USB4640/USB4640i has one internal FET which can be utilized for card power. This section

describes the default internal configuration. The settings are stored in

NVSTORE and provide the

following features:

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

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

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

external card power FET options. For internal FET card power control, bits 0 through 2 are used to

set the power limit. The

Device Power Configuration bits are ignored unless the Enable Device Power

Configuration bit is set. See Section 4.4.1.19 on page 32.

4.4.2.1 A0h-A1h: Memory Stick Device Power Configuration

4.4.2.2 A2h-A3h: Not Applicable

2 ATT_LHB 0 Attach on Card Insert/Detach on Card Removal

1 : attach on insert is enabled

0 : (default) - attach on insert is disabled

1 Always read as 0

2 Enable Device Power Configuration

1 : Custom Device Power Configuration stored in the NVSTORE is used

0 : (default) - Default Device Power Configuration is used

7:3 Always read as 0

3 ATT_HB 6:0 Always read as 0

7 xD Player Mode

FET NAME BITS BIT TYPE DESCRIPTION

0 MS_PWR_LB 3:0 Low Nibble FET Lo Byte

0000 : disabled

1 7:4 High Nibble

2 MS_PWR_HB 3:0 Low Nibble FET Hi Byte

0000 : disabled

0001 : external FET enabled

1000 : internal FET - 100 mA power limit

1010 : (default) internal FET - 200 mA power limit

3 7:4 High Nibble

0000 : disabled

BYTE NAME DESCRIPTION

1:0 N/A

BYTE

NAME BIT DESCRIPTION