High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
Datasheet
Revision 1.0 (06-01-09)
36
SMSC USB4640/USB4640i
DATASHEET
8.4.1.19
9Ch-9Fh: Attribute Byte Descriptions
BYTE
BYTE
NAME
BIT DESCRIPTION
0
ATT_LB
3:0
Always reads ‘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 reads ‘0’.
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' - This bit must be set to '1' to enable editing, updating, and reading from
registers 100h-17Fh.
'0' - The internal configuration is loaded. When this bit is not set (and it
equals '0'). It will not read from registers 100h-17Fh.
1
ATT_HLB
3:0
Always reads ‘0’.
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’ - The activity LED will function as a common media inserted/media
access LED.
‘0’ (default) - The activity LED will remain in its idle state until media is
accessed.
6
Always reads ‘0’.
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.
