USB5926CSLASHKD datasheet(43/65 Pages) MICROCHIP

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USB5926C

DS00003190B-page 43



2019 - 2021 Microchip Technology Inc.

8.8

USB Billboard Device Class Support

USB Billboard is supported by the USB5926C in conjunction with an external USB Power Delivery capable controller

that supports the USB PD stack and alternate mode negotiation.

When a USB Type-C enabled product supports alternate modes for enhanced capability beyond what is available

through USB connectivity alone, that product must support a USB Billboard endpoint so that a user will be notified by

an operating system when the enhanced capability is not enabled due to an alternate mode mismatch.

A good example of alternate mode functionality is support for a DisplayPort monitor that many docking stations provide.

In this case, the docking station offers DisplayPort (DP) capability over the USB-C connector as an alternate mode.The

DP monitor will only function correctly when a successful alternate mode negotiation occurs between the docking station

and the notebook PC (this is the USB-C to USB-C connection). In order for the alternate mode negotiation to succeed,

the Notebook and the Docking Station must both support DP over USB-C, and have the DP messaging capability

enabled to support alternate mode negotiation. If the alternate mode negotiation is successful, then the notebook and

the Docking Station both change their multiplexers to enable DP signaling over USB Type-C. In this case, no USB Bill-

board messages need to be displayed.

TABLE 8-8:

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

TABLE 8-9:

USB 3.X PORT SPLIT TOGGLE TIME REGISTER

USB3_PORT_SPLIT_TOGGLE_TIME

(0X4176 - RESET=0X05)

USB 3.X PORT SPLIT TOGGLE TIME REGISTER

BIT

NAME

R/W

DESCRIPTION

[7:0]

PORT_SPLIT_TOGGLE_

TIME[7:0]

R/W

The PORT_SPLIT_TOGGLE_TIME is used to control the length of

time port power is toggled off. This is specific to the

“

PRTPWRx_USB3_SPLIT” pin, and is only used in conjunction with

0X4171. The timer is always reset whenever the toggle completes.

The minimum toggle time is 350ms and is represented by

00000000b.

Each incremental value will add 10ms to the 350ms minimum value.

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