USB2517 datasheet(51/72 Pages) SMSC

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USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251x

Revision 1.0 (3-11-09)

DATASHEET

8.2.1.34

BIT

NUMBER

BIT NAME

DESCRIPTION

7:0

PRTR7

PortMap register for port 7.

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 mapping mode

is enabled (see PRTMAP_EN in Register 08h: Configuration Data Byte 3)

the hub's downstream port numbers can be mapped to different logical port

numbers (assigned by the host).

Note:

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 8.6 PortMap Register for Port 7

Bit [7:4]

‘0000’

‘1111’

Reserved

Bit [3:0]

‘0000’

Physical Port 7 is Disabled

‘0001’

Physical Port 7 is mapped to Logical Port 1

‘0010’

Physical Port 7 is mapped to Logical Port 2

‘0011’

Physical Port 7 is mapped to Logical Port 3

‘0100’

Physical Port 7 is mapped to Logical Port 4

‘0101’

Physical Port 7 is mapped to Logical Port 5

‘0110’

Physical Port 7 is mapped to Logical Port 6

‘0111’

Physical Port 7 is mapped to Logical Port 7

‘1000’

‘1111’

Reserved, will default to ‘0000’ value

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