USB4640 datasheet(49/64 Pages) SMSC

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

Datasheet

SMSC USB4640/USB4640i

Revision 1.0 (06-09-09)

DATASHEET

8.4.4.22

F3h: Port Map 3

8.4.4.23

F4h-F6h: Reserved

BIT

BYTE NAME

DESCRIPTION

7:0

PRTM3

PortMap register for port 3.

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 number ‘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.

BYTE

BYTE NAME

DESCRIPTION

6:0

Reserved

Reserved.

Table 8.6 Port Map Register for Port 3

Bit [7:4]

‘0000’

Reserved

‘0001’

Reserved

‘0010’

Reserved

‘0011’

Reserved

‘0100’

‘1111’

Illegal; Do not use

Bit [3:0]

‘0000’

Physical port 3 is disabled

‘0001’

Physical port 3 is mapped to Logical port 1

‘0010’

Physical port 3 is mapped to Logical port 2

‘0011’

Physical port 3 is mapped to Logical port 3

‘0100’

‘1111’

Illegal; Do not use

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