USB2640 datasheet(39/60 Pages) MICROCHIP

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DS00001947C-page 39

USB2640/USB2641

7.3.5.21

F2h: Port Map 12

Bit

Byte Name

Description

7:0

PRTM12

Port map 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:

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 7-4:

PORT MAP 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’

Physical Port 2 is mapped to Logical Port 3

‘0100’

‘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’

Physical Port 1 is mapped to Logical Port 3

‘0100’

‘1111’

Illegal; Do Not Use

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