USB2422 datasheet(39/51 Pages) SMSC

39 / 51 page

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB2422

Revision 1.0 (06-04-13)

DATASHEET

4.4.31

Status/Command Register (STCD)

Address:

FFh

Size:

8 bits

BITS

DESCRIPTION

TYPE

DEFAULT

7:3

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.

R/W

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

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

USB2422 数据表(PDF) 39 Page - SMSC Corporation

USB2422 数据表(HTML) 39 Page - SMSC Corporation

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