USB3503 datasheet(30/73 Pages) MICROCHIP

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USB3503

DS00001584B-page 30

 2011-2015 Microchip Technology Inc.

5.3.30

Default = 0x00h

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 configuration.

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

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 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

PrtPwrInt

Read:

1 = Port Power register has been updated

0 = Port Power register has not been updated since last PrtPwrInt reset

Write:

1 = No Effect

0 = Negate PrtPwrInt status low

1:0

Reserved

Bit Number

Bit Name

Description

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