4-Port USB 2.0 Hub Controller

Datasheet

1.2OEM Selectable Features

The 4-Port Hub supports several OEM selectable features:

ƒOperation as a bus-powered, self-powered or dynamic-powered hub. (When configured for dynamic operation, the controller automatically switches to bus-powered mode if a local power source is unavailable).

ƒConfigure downstream facing port power switching on an individual or ganged basis.

ƒConfigure downstream facing port over-current sensing on an individual or ganged basis.

ƒEnable downstream facing port LED indicators.

ƒSelect multiple or single transaction translator mode.

ƒSelect whether the hub is part of a compound device (when any downstream facing port is permanently hardwired to a USB peripheral device, the hub is part of a compound device).

ƒSelect the presence of a permanently hardwired USB peripheral device on a port by port basis.

ƒEnable downstream facing ports a port by port basis.

ƒEnable EOP generation of EOF1 when operating in full-speed mode, as described in Section 11.3.1 of the USB 2.0 Specification.

ƒEnable USB On-The-Go Session Request Protocol (SRP) support.

ƒConfigure the delay time for filtering the over-current sense inputs.

ƒConfigure the delay time until port power is good after the SetPortPower command is received.

ƒIndicate the maximum current that the 4-port hub consumes from an upstream port.

ƒIndicate the maximum current required for the hub controller.

1.3Pin Selectable Options to the Default Configuration

The USB20H04 includes a default configuration for those applications where an external EEPROM or SMBus device is not available to provide the configuration. This configuration may be adequate in some applications. A pin selectable feature supports configuration as either a bus-powered hub or a self-powered hub determined by the logic level of the SELF_PWR pin following reset.

Revision 1.63 (03-30-07)

Page 6

SMSC USB20H04

DATASHEET