Datasheet

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

Datasheet

Revision 1.3 (03-13-13) 32 SMSC USB4640/USB4640i

DATASHEET

4.4.1.18 9Bh: USB MaxPower (1 Byte)

4.4.1.19 9Ch-9Fh: Attribute Byte Descriptions

BIT NAME DESCRIPTION

7:0 USB_MAX_PWR USB Max Power per the

USB 2.0 Specification [1]. Do NOT set this value

greater than 100 mA.

BYTE

NAME BIT DESCRIPTION

0 ATT_LB 3:0 Always read as 0

4 Inquire Manufacturer and Product ID Strings

1 : use the Inquiry Manufacturer and Product ID Strings

0 : (default) use the USB Descriptor Manufacturer and Product ID Strings

5 Always read as

6 Reverse SD Card Write Protect Sense

1 : (default) SD cards will be write protected when SW_nWP is high, and

writable when

SW_nWP is low.

0 : SD cards will be write protected when SW_nWP is low, and writable

when

SW_nWP is high.

7 Extended Configuration Enable

1 : enables editing, updating, and reading from registers 100h-17Fh.

0 : internal configuration is loaded, where it will not read from registers

100h-17Fh.

1 ATT_HLB 3:0 Always read as

4 Activity LED True Polarity

1 : activity LED to low true

0 : (default) - activity LED polarity to high true

5 Common Media Insert/Media Activity LED

1 : activity LED will function as a common media inserted/media access

LED.

0 : (default) - activity LED will remain in its idle state until media is

accessed.

6 Always read as

7 Reverse SD2 Card Write Protect Sense

1 : (default) - SD cards in LUN 1 will be write protected when SW_nWP is

high, and writable when

SW_nWP is low.

0 : SD cards in LUN 1 will be write protected when SW_nWP is low, and

writable when

SW_nWP is high.