USB82640 datasheet(39/64 Pages) MICROCHIP

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DS60001312A-page 39

USB82640

7.3.3.32

F3h: PortMap 3

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 permit-

ted 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 down-

stream 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.

TABLE 7-6:

PORTMAP REGISTER FOR PORT 3

Bit [7:4]

0000

rsvd

0001

rsvd

0010

rsvd

0011

rsvd

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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