2-Port USB 2.0 Hub Controller

Datasheet

BIT

 

 

 

NUMBER

BIT NAME

 

DESCRIPTION

 

 

 

5

HS_DISABLE

High Speed Disable: Disables the capability to attach as either a High/Full-

 

 

speed device, and forces attachment as Full-speed only i.e. (no High-Speed

 

 

support).

 

 

0

= High-/Full-Speed.

 

 

1

= Full-Speed-Only (High-Speed disabled!)

 

 

 

4

Reserved

Reserved

 

 

 

3

EOP_DISABLE

EOP Disable: Disables EOP generation of EOF1 when in Full-Speed mode.

 

 

0

= EOP generation is normal.

 

 

1

= EOP generation is disabled.

 

 

 

2:1

CURRENT_SNS

Over Current Sense: Indicates whether current sensing isganged.

 

 

00 = Ganged sensing (all ports together).

 

 

01 = Reserved1x = Over current sensing not supported. (must only be used

 

 

with Bus-Powered configurations!)

 

 

 

0

Reserved

Reserved

 

 

 

 

5.3.9.9Register 08h: Configuration Data Byte 2 (Reset = 0x00)

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.

 

 

 

6

Reserved

Reserved

 

 

 

5:4

OC_TIMER

OverCurrent Timer: Over Current Timer delay.

 

 

00 = 0.1ms

 

 

01 = 2ms

 

 

10 = 4ms

 

 

11 = 6ms

 

 

 

3

COMPOUND

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

 

 

0

= No.

 

 

1

= Yes, Hub is part of a compound device.

 

 

 

2:0

Reserved

Reserved

 

 

 

 

SMSC USB2502

29

Revision 2.3 (08-27-07)

 

DATASHEET