USB2512 datasheet(18/37 Pages) SMSC

18 / 37 page

USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

Revision 1.92 (11-28-07)

SMSC USB2512

DATASHEET

4.2.1.9

4.2.1.10

BIT

NUMBER

BIT NAME

DESCRIPTION

7:4

Reserved

PRTMAP_EN

Port Re-mapping enable: Selects the method used by the hub to assign port

numbers and disable ports.

‘0’ = Standard Mode

‘1’ = Port Re-map mode

2:0

Reserved

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

undetachable 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= Reserved, always = ‘0’

Bit 3= Reserved, always = ‘1’

Bit 2= 1; Port 2 non-removable

Bit 1= 1; Port 1 non removable

Bit 0= Reserved, always = ‘0’

USB2512 Datasheet(PDF) 18 Page - SMSC Corporation