USB2422SLASHMJ datasheet(28/51 Pages) SMSC

28 / 51 page

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (06-04-13)

SMSC USB2422

DATASHEET

EOP Disable (EOP_DISABLE)

Disables EOP generation of EOF1 when in Full-Speed mode. During FS

operation only, this permits the Hub to send EOP if no downstream traffic is

detected at EOF1. See Section 11.3.1 of the USB 2.0 Specification for

additional details.

Note:

generation of an EOP at the EOF1 point may prevent a Host

controller (operating in FS mode) from placing the USB bus in

suspend.

0 = An EOP is generated at the EOF1 point if no traffic is detected

1 = EOP generation at EOF1 is disabled (Note: This is normal USB

operation)

Note:

This is a rarely used feature in the PC environment. It is included

because it is a permitted feature in Chapter 11 of the USB

specification.

R/W

2:1

Over Current Sense (CURRENT_SNS)

Selects current sensing on a port-by-port basis, all ports ganged, or none

(only for bus-powered hubs) The ability to support current sensing on a port

or ganged basis is hardware implementation dependent.

00 = Ganged sensing (all ports together)

01 = Individual port-by-port

1x = Over current sensing not supported (Must only be used with Bus-

Powered configurations)

R/W

00b

Port Power Switching (PORT_PWR)

Enables power switching on all ports simultaneously (ganged), or port power

is individually switched on and off on a port- by-port basis (individual). The

ability to support power enabling on a port or ganged basis is hardware

implementation dependent.

0 = Ganged switching (all ports together)

1 = Individual port-by-port switching

R/W

BITS

DESCRIPTION

TYPE

DEFAULT

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