USB2512 datasheet(23/37 Pages) SMSC

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USB 2.0 High-Speed 2-Port Hub Controller

Datasheet

SMSC USB2512

Revision 1.92 (11-28-07)

DATASHEET

4.2.1.21

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PRTR12

Port remap register for ports 1 & 2.

When a hub is enumerated by a USB Host Controller, the hub is only

permitted to report how many ports it has; the hub is not permitted to select

a numerical range or assignment. The Host Controller will number the

downstream ports of the hub starting with the number '1', up to the number

of ports that the hub reported having.

The host's port number is referred to as "Logical Port Number" and the

physical port on the hub is the “Physical Port Number". When remapping

mode is enabled (see PRTMAP_EN in Register 08h: Configuration Data

Byte 3) the hub's downstream port numbers can be remapped to different

logical port numbers (assigned by the host).

Note:

The OEM must ensure that Contiguous Logical Port Numbers are

used, starting from #1 up to the maximum number of enabled ports;

this ensures that the hub's ports are numbered in accordance with

the way a Host will communicate with the ports.

Table 4.2 Port Remap Register for Ports 1 & 2

Bit [7:4]

‘0000’

Physical Port 2 is Disabled

‘0001’

Physical Port 2 is mapped to Logical Port 1

‘0010’

Physical Port 2 is mapped to Logical Port 2

‘0011’

‘1111’

Illegal; Do Not Use

Bit [3:0]

‘0000’

Physical Port 1 is Disabled

‘0001’

Physical Port 1 is mapped to Logical Port 1

‘0010’

Physical Port 1 is mapped to Logical Port 2

‘0011’

‘1111’

Illegal; Do Not Use

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