USB2524 datasheet(25/57 Pages) SMSC

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USB MultiSwitchTM Hub

Datasheet

SMSC USB2524

Revision 1.91 (08-22-07)

DATASHEET

7.1.4.10

PRT_ASSIGN_CFG Port Assignment Configuration:

‘0’ = Port assignment is controlled by hardware interface pins

‘1’ = Port assignment is controlled by:

PORT_ASSIGN_12

PORT_ASSIGN_34

PORT_ASSIGN_56

PORT_ASSIGN_7

4:3

Reserved

Reserved, always = ‘0’.

2:1

LED_MODE

LED Mode Selection: The LED_A[4:1]_N and LED_B[4:1]_N pins support

several different modes of operation (depending upon OEM implementation of

the LED circuit).

‘00’ = USB Mode, (see USB Mode: on page 44 for description)

‘01’ = Host Ownership and Port Speed LED indicator, (see Host Ownership and

Port Speed LED Indication: on page 45 for description)

‘10’ = Basic Host Ownership LED indicator, (see Basic Host Owner LED

Indication: on page 44 for description)

‘11’ = Same as "00", USB Mode

Warning: Do not enable an LED mode that requires LED pins that are not

available in the specific package being used in the implementation!

STRING_EN

Enables String Descriptor Support

‘0’ = String Support Disabled

‘1’ = String Support Enabled

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

NR_DEVICE

Non-Removable Device: Indicates which port(s) include non- removable

devices. ‘0’ = port is removable, ‘1’ = port is non- removable.

Informs the Host if one of the active ports has a permanent device that is un-

detachable from the Hub. (Note: The device must provide its own descriptor

data.)

When using the internal default option, the NON_REM[1:0] pins will designate

the appropriate ports as being non- removable.

Bit 7= Reserved, always = ‘0’.

Bit 6= Reserved, always = ‘0’.

Bit 5= Reserved, always = ‘0’.

Bit 4= 1; Port 4 is disabled.

Bit 3= 1; Port 3 non-removable.

Bit 2= 1; Port 2 non-removable.

Bit 1= 1; Port 1 non-removable.

Bit 0 is Reserved, always = ‘0’.

BIT

NUMBER

BIT NAME

DESCRIPTION

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