USB2422 Datasheet, PDF (39/51 Pages) SMSC Corporation – 2-Port USB 2.0 Hi-Speed Hub Controller

4.4.31
Status/Command Register (STCD)
Address:
FFh
Size:
2-Port USB 2.0 Hi-Speed Hub Controller
Datasheet
8 bits
BITS
7:3
2
1
0
DESCRIPTION
RESERVED
SMBus Interface Power Down (INTF_PW_DN)
0 = Interface is active
1 = Interface power down after ACK has completed
Note: This bit is write once and is only cleared by assertion of the
external RESET_N pin.
Reset (RESET)
Resets the SMBus Interface and internal memory back to RESET_N
assertion default settings.
0 = Normal Run/Idle State
1 = Force a reset of the registers to their default state
Note: During this reset, this bit is automatically cleared to its default value
of 0.
USB Attach and Write Protect (USB_ATTACH)
0 = SMBus slave interface is active
1 = Hub will signal a USB attach event to an upstream device, and the
internal memory that is not Modify capable in the address range 00h-
FEh, is “write-protected” to prevent unintentional data corruption.
Note: This bit is write once and is only cleared by assertion of the
external RESET_N pin.
TYPE
-
R/W
R/W
R/W
DEFAULT
-
0b
0b
0b
SMSC USB2422
39
DATASHEET
Revision 1.0 (06-04-13)