USB2503 datasheet(20/43 Pages) SMSC

20 / 43 page

Integrated USB 2.0 Compatible 3-Port Hub

Datasheet

Revision 2.1 (12-06-06)

SMSC USB2503/USB2503A

DATASHEET

5.2.3.5

EEPROM Offset 7(h) - CONFIG_BYTE_2

EOP_DISABLE

EOP Disable: Disables EOP generation at EOF1 when no downstream

directed traffic is in progress.

0 = EOP generation at EOF1 is enabled.

1 = EOP generation at EOF1 is disabled, (normal operation). (Default)

2:1

CURRENT_SNS

Over Current Sense: Indicates whether current sensing is on a port-by-port

basis, or ganged.

00 = Ganged sensing (all ports together). (Default for self-power)

01 = Individual port-by-port.

1x = Over current sensing not supported. (may be used with Bus-Powered

configurations only!, and is the default for bus-power)

PORT_PWR

Port Power Switching: Indicates whether port power switching is on a port-

by-port basis or ganged.

0 = Ganged switching (all ports together)

1 = Individual port-by-port switching.

BIT

NUMBER

BIT NAME

DESCRIPTION

DYNAMIC

Dynamic Power Enable: Controls the ability for the Hub to transition to Bus-

Powered operation if the local power source is removed (can revert back to

Self-Power if local power source is restored).

0 = No Dynamic auto-switching.

1 = Dynamic Auto-switching capable.(Default)

Reserved

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

00 = 0.1ms

01 = 2ms (Default)

10 = 4ms

11 = 6ms

COMPOUND

Compound Device: Designates if Hub is part of a compound device.

0 = No. (Default)

1 = Yes, Hub is part of a compound device.

2:0

Reserved

Reserved.

BIT

NUMBER

BIT NAME

DESCRIPTION

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