SMSC USB464, USB4640i 8.4.2A0h-A7h:Device Power Configuration, 8.4.2.1A0h-A1h:Memory Stick Device Power Configuration, 8.4.2.2A2h-A3h:Not Applicable, BIT, FET, 3:0, BYTE, BYTE, NAME

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

Datasheet

	BYTE
BYTE	NAME	BIT	DESCRIPTION
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 reads ‘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 reads ‘0’.
3	ATT_HB	6:0	Always reads ‘0’.
		7	xD Player Mode

8.4.2A0h-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 8.4.1.19, "9Ch-9Fh: Attribute Byte Descriptions," on page 36.

8.4.2.1A0h-A1h: Memory Stick Device Power Configuration

FET	TYPE	BITS	BIT TYPE		DESCRIPTION
0	FET Lo Byte	3:0	Low Nibble	0000b	Disabled
	MS_PWR_LB
1		7:4	High Nibble
2	FET Hi Byte	3:0	Low Nibble	0000b	Disabled
	MS_PWR_HB			0001b	External FET enabled
				1000b	Internal FET with 100 mA power limit
				1010b Internal FET with 200 mA power limit
3		7:4	High Nibble	0000b	Disabled

8.4.2.2A2h-A3h: Not Applicable

BYTE	NAME		DESCRIPTION
1:0	Not Applicable	Not applicable.
SMSC USB4640/USB4640i		37	Revision 1.0 (06-01-09)

DATASHEET