USB3803 datasheet(33/99 Pages) MICROCHIP

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 2014-2015 Microchip Technology Inc.

DS00001691B-page 33

USB3803

5.3.31

Default = 0x00h

connect_n

The SOC can utilize this bit to control when the hub attempts to connect to the

upstream host. (Alternatively, HUB_CONNECT is used to proceed through Hub

Connect Stage, as shown in Figure 4-1.)

1 = Device will remain in Hub Mode.Connect Stage indefinitely until bit is cleared

by the SOC.

0 = Device will transition to the Hub Mode.Communication Stage after this bit is

asserted low by default or through a serial port write.

config_n

If the SOC intends to update the default configuration using the serial port, this

dependency between configuration and device operation can be minimized- the

SOC is only required to write to Serial Port Interlock Register within Thubconfig

and not all the registers it is attempting to configure.

Once all registers have been written for the desired configuration, the SOC must

clear this bit to ‘0’ for the device to resume normal operation using the new con-

figuration.

It may be desirable for the device to initiate autonomous operation with no SOC

intervention at all. This is why the default setting is to allow the device to initiate

automatic operation if the SOC does not intervene by writing the interlock regis-

ter within the allotted configuration timeout.

1 = Device will remain in Hub Mode.Configuration Stage indefinitely, and allow

SOC to write through the serial port to set any desired configuration.

0 = Device will transition out of Hub.Configuration Stage and into the Hub

Mode.Charger Detection Stage immediately after this bit is asserted low through

a serial port write. (A default low assertion results in transition after a timeout.)

Bit Number

Bit Name

Description

Interrupt

Read:

1 = INT_N pin has been asserted low due to unmasked interrupt

0 = INT_N pin has not been asserted low due to unmasked interrupt

Write:

1 = No Effect – INT_N pin and register retains its current value

0 = Negate INT_N pin high

6:5

Reserved

HubSuspInt

Read:

1 = Hub has entered USB suspend

0 = Hub has not entered USB suspend since last HubSuspInt reset

Write:

1 = No Effect

0 = Negate HubSuspInt status low

HubCfgInt

Read:

1 = Hub has been configured by USB Host

0 = Hub has not been configured by USB Host since last HubConfInt reset

Write:

1 = No Effect

0 = Negate HubConfInt status low

Bit Number

Bit Name

Description

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