High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller

 

 

Datasheet

 

 

 

BIT

NAME

DESCRIPTION

 

 

 

4:3

Reserved

Reserved

 

 

 

2:1

CURRENT_SNS

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 per port or ganged basis is dependent upon the

 

 

hardware implementation.

 

 

‘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!)

 

 

 

0

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 dependent upon the hardware implementation.

 

 

‘0’ = Ganged switching (all ports together)

 

 

‘1’ = Individual port-by-port switching

 

 

 

8.4.4.8E5h: Configuration Data Byte 2 (CFG_DAT_BYT2)

BIT

NAME

DESCRIPTION

 

 

 

7:6

Reserved

Reserved

 

 

 

5:4

OC_TIMER

OverCurrent Timer: Over-current timer delay.

 

 

‘00’ = 50 ns

 

 

‘01’ = 100 ns

 

 

‘10’ = 200 ns

 

 

‘11’ = 400 ns

 

 

 

3

COMPOUND

Compound Device: Allows OEM to indicate that the hub is part of a

 

 

compound device (per the USB 2.0 Specification). The applicable port(s)

 

 

must also be defined as having a “non-removable device”.

 

 

Note: When configured via strapping options, declaring a port as non-

 

 

removable automatically causes the hub controller to report that it

 

 

is part of a compound device.

 

 

‘0’ = No

 

 

‘1’ = Yes, the hub is part of a compound device

 

 

 

2:0

Reserved

Reserved

 

 

 

8.4.4.9E6h: Configuration Data Byte 3 (CFG_DAT_BYT3)

BIT

NAME

DESCRIPTION

 

 

 

7:4

Reserved

Reserved

 

 

 

Revision 1.0 (06-01-09)

42

SMSC USB4640/USB4640i

DATASHEET