USB2422SLASHMJ datasheet(30/51 Pages) SMSC

30 / 51 page

2-Port USB 2.0 Hi-Speed Hub Controller

Datasheet

Revision 1.0 (06-04-13)

SMSC USB2422

DATASHEET

4.4.9

Configuration Data Byte 3 Register (CFG3)

4.4.10

Non-Removable Device Register (NRD)

Address:

08h

Size:

8 bits

BITS

DESCRIPTION

TYPE

DEFAULT

7:4

RESERVED

Port Remapping Enable (PRTMAP_EN)

Selects the method used by the hub to assign port numbers and disable

ports

0 = Standard Mode

Strap options or the following registers are used to define which ports are

enabled, and the ports are mapped as Port'n' on the hub is reported as

Port'n' to the host, unless one of the ports is disabled, then the higher

numbered ports are remapped in order to report contiguous port numbers to

the host.

1 = Port Re-Map mode

The mode enables remapping via Register FBh: Port Remap 12

R/W

2:1

RESERVED

String Enable (STRING_EN)

Enables string descriptor support.

0 = String support disabled

1 = String support enabled

R/W

Address:

09h

Size:

8 bits

BITS

DESCRIPTION

TYPE

DEFAULT

7:0

Non-Removable Device (NR_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 physical 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

Bit 6= Reserved

Bit 5= Reserved

Bit 4= Reserved

Bit 3= Reserved

Bit 2= Port 2 non-removable

Bit 1= Port 1 non removable

Bit 0= Reserved

R/W

00h

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