Integrated USB 2.0 Compatible 4-Port Hub

 

 

 

Datasheet

 

 

 

 

BIT

 

 

 

NUMBER

BIT NAME

 

DESCRIPTION

 

 

 

3

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, or no overcurrent sensing.

 

 

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)

 

 

 

0

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.

 

 

 

 

5.2.3.5EEPROM Offset 7(h) - CONFIG_BYTE_2

BIT

 

 

 

NUMBER

BIT NAME

 

DESCRIPTION

 

 

 

7

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)

 

 

 

6

Reserved

Reserved

 

 

 

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

 

 

00 = 0.1ms

 

 

01 = 2ms (Default)

 

 

10 = 4ms

 

 

11 = 6ms

 

 

 

3

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.

 

 

 

 

Revision 2.3 (08-27-07)

22

SMSC USB2504/USB2504A

 

DATASHEET