USB2513 datasheet(22/48 Pages) SMSC

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USB 2.0 High-Speed 3-Port Hub Controller

Datasheet

Revision 1.98 (11-19-07)

SMSC USB2513

DATASHEET

4.3.1.7

BIT

NUMBER

BIT NAME

DESCRIPTION

SELF_BUS_PWR

Self or Bus Power: Selects between Self- and Bus-Powered operation.

The Hub is either Self-Powered (draws less than 2mA of upstream bus

power) or Bus-Powered (limited to a 100mA maximum of upstream power

prior to being configured by the host controller).

When configured as a Bus-Powered device, the SMSC Hub consumes less

than 100mA of current prior to being configured. After configuration, the Bus-

Powered SMSC Hub (along with all associated hub circuitry, any embedded

devices if part of a compound device, and 100mA per externally available

downstream port) must consume no more than 500mA of upstream VBUS

current. The current consumption is system dependent, and the OEM must

ensure that the USB 2.0 specifications are not violated.

When configured as a Self-Powered device, <1mA of upstream VBUS

current is consumed and all ports are available, with each port being capable

of sourcing 500mA of current.

This field is set by the OEM using either the SMBus or EEPROM interface

options.

Please see the description under Dynamic Power for the self/bus power

functionality when dynamic power switching is enabled.

0 = Bus-Powered operation

1 = Self-Powered operation

Note:

If Dynamic Power Switching is enabled, this bit is ignored and the

LOCAL_PWR pin is used to determine if the hub is operating from

self or bus power.

Reserved

HS_DISABLE

High Speed Disable: Disables the capability to attach as either a High/Full-

speed device, and forces attachment as Full-speed only (i.e. no High-Speed

support).

0 = High-/Full-Speed

1 = Full-Speed-Only (High-Speed disabled!)

MTT_ENABLE

Multi-TT enable: Enables one transaction translator per port operation.

Selects between a mode where only one transaction translator is available

for all ports (Single-TT), or each port gets a dedicated transaction translator

(Multi-TT) {Note: The host may force Single-TT mode only}.

0 = single TT for all ports

1 = one TT per port (multiple TT’s supported)

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 = EOP generation is normal

1 = EOP generation is disabled

2:1

CURRENT_SNS

Over Current Sense: 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!)

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