USB3503 datasheet(35/73 Pages) MICROCHIP

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DS00001584B-page 35

USB3503

5.3.39

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

5.3.40

Default = 0x00h

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

communicate 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

Bit Number

Bit Name

Description

7:2

Reserved

Reserved {Note: Software must never write a ‘1’ to these bits}

RESET

Reset the Serial Interface and internal memory registers in address

range 00h-E1h and EFh-FFh back to RESET_N assertion default

settings. {Note: During this reset, this bit is automatically cleared to its

default value of 0.}

0 = Normal Run/Idle State.

1 = Force a reset of the registers to their default state.

CONFIG_PROTECT

Protect the Configuration

0 = serial slave interface is active.

1 = The internal configuration memory (address range 00h-E1h and EFh-

FFh) is “write-protected” to prevent unintentional data corruption.

{Note 1: This bit is write once and is only cleared by assertion of the

external RESET_N pin.}

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