USB2517 datasheet(35/58 Pages) MICROCHIP

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 2013-2016 Microchip Technology Inc.

DS00001598B-page 35

USB2517/USB2517I

7.2.1.31

Bit

Number

Bit Name

Description

7:0

PRTR34

Port remap register for ports 3 & 4

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 recognizes.

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 accor-

dance with the way a Host will communicate with the ports.

TABLE 7-3:

PORT REMAP REGISTER FOR PORTS 3 & 4

Bit [7:4]

‘0000’

Physical Port 4 is Disabled

‘0001’

Physical Port 4 is mapped to Logical Port 1

‘0010’

Physical Port 4 is mapped to Logical Port 2

‘0011’

Physical Port 4 is mapped to Logical Port 3

‘0100’

Physical Port 4 is mapped to Logical Port 4

‘0101’

Physical Port 4 is mapped to Logical Port 5

‘0110’

Physical Port 4 is mapped to Logical Port 6

‘0111’

Physical Port 4 is mapped to Logical Port 7

‘01011

000’

‘1111’

Reserved, will default to ‘0000’ value

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’

Physical Port 3 is mapped to Logical Port 4

‘0101’

Physical Port 3 is mapped to Logical Port 5

‘0110’

Physical Port 3 is mapped to Logical Port 6

‘0111’

Physical Port 3 is mapped to Logical Port 7

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