USB3503 datasheet(34/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 34

 2011-2015 Microchip Technology Inc.

5.3.38

Default = 0x21h - Physical Port is mapped to the corresponding logical port.

Bit Number

Bit Name

Description

7:0

PRTR12

Port remap 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 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 communicate with the ports.

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’ Reserved, will default to ‘0000’ value

‘0101’

‘1111’

Reserved, will default to ‘0000’ value

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’ Reserved, will default to ‘0000’ value

‘0101’

‘1111’

Reserved, will default to ‘0000’ value

USB3503 Datenblatt(PDF) 34 Page - Microchip Technology