Datasheet

USB2422
DS00001726B-page 34  2013 - 2015 Microchip Technology Inc.
4.4.31 STATUS/COMMAND REGISTER (STCD)
Address: FFh Size: 8 bits
Bits Description Type Default
7:3 RESERVED --
2 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.
R/W 0b
1 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.
R/W 0b
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.
R/W 0b