USB2503 datasheet(15/43 Pages) SMSC

15 / 43 page

Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

SMSC USB2503/USB2503A

Revision 2.3 (08-27-07)

DATASHEET

5.1.1.5

Port Indicators

Controls the use of LED indicator for Port status information. See Section 11.5.3 of the USB 2.0

Specification for additional details.

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

5.1.1.6

High-Speed Disable

Allows an OEM to force the Hub to configure as a Full-Speed device only (i.e. High-Speed not

available).

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

5.1.1.7

Multiple-TT Support

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}.

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

5.1.1.8

EOP Disable

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.

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

5.1.1.9

Current Sensing

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.

This field can be set by the OEM using either the SMBus or EEPROM interface options.When using

the internal default option, the SELF_PWR pin determines if current sensing will be ganged, or none

(ganged if self-powered, none if bus-powered)

5.1.1.10

Downstream Port Power Enabling

Enables all ports simultaneously (ganged), or port power is individually switched on and off on a port-

by-port basis. The ability to support power enabling on a port or ganged basis is hardware

implementation dependent.

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

internal default option, the GANG_EN pin will configure the hub for ganged or individual port-by-port

port power switching.

5.1.1.11

Compound Device

Allows the OEM to indicate that the Hub is part of a compound (see the USB Specification for

definition) device. The applicable port(s) must also be defined as having a “Non-Removable Device”.

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

Note: When configured via strapping options, declaring a port as non-removable automatically causes

the hub controller to report that it is part of a compound device.

5.1.1.12

Non-Removable Device

Informs the Host if one of the active ports has a permanent device that is undetachable from the Hub.

(Note: The device must provide its own descriptor data.)

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