GPIO4 datasheet(38/60 Pages) MICROCHIP

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USB5806

DS00002236D-page 38

 2016-2018 Microchip Technology Inc.

A valid USB 3.1 Gen 1 link is qualified by the LTSSM_STATE register status for the port. A normal Link will actively

switch through many Link states.

If the hub detects that the Link is staying in one of the following Link states the entire duration of the timeout timer, then

the Link is stuck in an invalid state and PRTPWRx_USB3_SPLIT will be toggled in order to attempt to re-establish the

Link.

• SIS.Disabled(0x4)

• Rx.Detect(0x5)

• SS.Inactive(0x6)

• Polling(0x7)

• Recovery(0x8)

• HotReset (0x9)

The Link Timeout Reset value is configured via register 0x4171 and can be overridden by OTP. The default value is

0x05, which selects a Timeout value of 1 second. Setting the register to 0x00 will disable the Link Timeout Reset feature.

The duration of the Link reset (time which PRTPWRx_USB3_SPLIT signal stays low) can be configured in register

0x4176. The default duration is 400ms with a configurable range of 350ms to 2.9s.

8.9

USB Billboard Device Class Support

TABLE 8-7:

USB 3.X PORT SPLIT LINK TIMEOUT REGISTER

USB3_PORT_SPLIT_TIMEOUT

(0X4171 - RESET=0X05)

USB 3.X PORT SPLIT LINK TIMEOUT REGISTER

BIT

NAME

R/W

DESCRIPTION

[7:3]

Reserved

R/W

Always read ‘0’

[2:0]

PORT_SPLIT_TIMEOUT[

2:0]

R/W

Global USB Port Splitting Link Timeout Value

If Port Splitting is enabled on a port and there is no valid USB 3.x

Link for the configured amount of time, then the associated

“PRTPWRx_USB3_SPLIT” pin will be toggled in an attempt to reset

the embedded USB 3.x device and re-establish the USB 3.x Link.

The timer is always reset and restarted whenever the timeout

occurs.

000b - No Timeout, never toggle PRTPWRx_USB3_SPLIT

001b - 100ms

010b - 250ms

011b - 500ms

100b - 750ms

101b - 1 second

110b - 2 second

111b - Reserved

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