USB2240I-AEZG-XX Standard Microsystems (SMSC), USB2240I-AEZG-XX Datasheet - Page 32

• Manufacturer Part Number: USB2240I-AEZG-XX
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2240I-AEZG-XX

• Lead Free Status / RoHS Status: Compliant

Revision 2.0 (10-14-09)
7.2.4
7.2.4.1
7.2.4.2
7.2.4.3
FET
FET
BYTE
0
1
2
3
0
1
2
3
1:0
MS_PWR_HB
MS_PWR_LB
xD_PWR_HB
xD_PWR_LB
FET Lo Byte
FET Hi Byte
FET Lo Byte
FET Hi Byte
A0h-A7h: Device Power Configuration
The USB224x 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
page
A0h-A1h: Memory Stick Device Power Configuration
A2h-A3h: Not Applicable
A4h-A5h: xD-Picture Card Device Power Configuration
When applicable, the "SM" value will be overridden with “xD” once an xD-Picture Card has been
identified.
TYPE
TYPE
Not Applicable
31.
NAME
BITS
BITS
3:0
3:0
3:0
7:4
7:4
3:0
7:4
7:4
Not applicable.
Low Nibble
High Nibble
Low Nibble
High Nibble
Low Nibble
High Nibble
Low Nibble
High Nibble
BIT TYPE
BIT TYPE
Ultra Fast USB 2.0 Multi-Format, SD/MMC, and MS Flash Media Controllers
DATASHEET
Section 7.2.3.19, "9Ch-9Fh: Attribute Byte Descriptions," on
32
0000b Disabled
0000b Disabled
0001b External FET enabled
1000b Internal FET with 100 mA power limit
1010b Internal FET with 200 mA power limit
0000b Disabled
0000b Disabled
0000b Disabled
0001b External FET enabled
1000b Internal FET with 100 mA power limit
1010b Internal FET with 200 mA power limit
0000b Disabled
DESCRIPTION
DESCRIPTION
DESCRIPTION
SMSC USB224x
Datasheet