USB3803 datasheet(40/99 Pages) MICROCHIP

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USB3803

DS00001691B-page 40

 2014-2015 Microchip Technology Inc.

5.3.44

Default = 0x03h - Physical port is mapped to corresponding logical port.

Bit Number

Bit Name

Description

7:0

PRTR34

Port remap register for ports 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 Section 5.3.9) the hub’s downstream port numbers can be

remapped to different logical port numbers (assigned by the host).

Note: the customer 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 com-

municate with the ports.

Bit [7:4] =

‘0000’ Reserved – software must not write ‘1’ to any of these bits.

‘0001’

‘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’ Reserved, will default to ‘0000’ value Physical Port 3 is

mapped to Logical Port 4

‘0101’

‘1111’

Reserved, will default to ‘0000’ value

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