USB5806 datasheet(40/60 Pages) MICROCHIP

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USB5806

DS00002236D-page 40

 2016-2018 Microchip Technology Inc.

8.9.2

BILLBOARD ENDPOINT FUNCTIONALITY

When the applicable GPIOx pin is 0, which indicates that Billboard device must be displayed, the following sequence

of events will occur:

USB5806 will force the Hub Feature Controller internal device to disconnect from the USB Hub port (emulating

a physical detach)

USB5806 will force the Hub Feature Controller to re-connect with descriptors that will show the Hub Feature Con-

troller endpoint is a Billboard device, compliant to version 1.1 of the Billboard device class specification.

USB5806 will start a timer (Timer A) when the Host sets the Hub Feature Controller USB address. This timer will

be used to ensure that the Billboard endpoint will not remain permanently attached if it is never accessed. The

default Timer A timeout is 20 seconds.

This implementation will only support Billboard when a failure occurs, therefore the Device Container uses a

static list of device capabilities and will only expose the Billboard Device on failure to enter into Modal Operation

and will set the bmConfigured descriptor field to “Unspecified Error” (00b) by default.

The Hub Feature Controller will Provide the iAlternateModeString when the host requests it, and will start a timer

(Timer B). The default Timer B timeout is 20 seconds.

When either timer expires, the USB5806 will force the Hub Feature Controller internal device to disconnect from

the USB Hub port (emulating a physical detach).

USB5806 will force the Hub Feature Controller to re-connect with the standard Hub Feature Controller Function-

ality.

TABLE 8-9:

USB BILLBOARD CONTROL

USBBILLBOARDCNTL

(OTP ADDR4 - RESET=0X14)

USB BILLBOARD CONTROL

BIT

NAME

R/W

DESCRIPTION

[7:6]

Reserved

R/W

Always read ‘0’

[5:1]

BILLBOARD_EN Pin

Select

R/W

00000= GPIO64

00001= GPIO1

00010= GPIO2

00011= GPIO3

00100= GPIO65

00101= GPIO66

00110= GPIO67

00111= GPIO23

01000= GPIO10

01001= Reserved

01010= GPIO68 (default)

01011= GPIO6

01100= GPIO69

01101= GPIO70

01110= GPIO71

01111= GPIO5

10000= GPIO4

[0]

Billboard Support Enable

R/W

0 = Billboard support disabled

1 = Billboard support enabled

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