USB3503 datasheet(22/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 22

 2011-2015 Microchip Technology Inc.

5.3.7

Default = 0x98h - Corresponds to Self Powered, Ganged Port Power

Bit Number

Bit Name

Description

SELF_BUS_PW

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

The Hub is either Self-Powered or Bus-Powered.

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

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

Powered 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 customer 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 customer using the serial interface options.

0 = Bus-Powered operation.

1 = Self-Powered operation.

Reserved

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)

Reserved

2:1

CURRENT_SN

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!)

PORT_PWR

Port Power Switching: 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.

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