USB84604 datasheet(26/61 Pages) MICROCHIP

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USB84604

DS60001295C-page 26

 2014-2016 Microchip Technology Inc.

5.1.7

NORMAL MODE

Lastly the SOC enters the Normal Mode of operation. In this stage, full USB operation is supported under control of the

USB Host on the upstream port. The device will remain in the normal mode until the operating mode is changed by the

system. The only device registers accessible to the SOC are the run time registers described in AN 26.18 SMBus Slave

Interface for the USB253x/USB3x13/USB46x4 [ 7].

If RESET_N is asserted low, then Standby Mode is entered. The device may then be placed into any of the designated

Hub stages. Asserting the soft disconnect on the upstream port will cause the Hub to return to the Hub.Connect stage

until the soft disconnect is negated.

To save power, communication over the SMBus is not supported while in USB Suspend. The system can prevent the

device from going to sleep by asserting the ClkSusp control bit of the Configure Portable Hub Register (described in AN

26.18 SMBus Slave Interface for the USB253x/USB3x13/USB46x4 [ 7]) anytime before entering USB Suspend. While

the device is kept awake during USB Suspend, it will provide the SMBus functionality at the expense of not meeting

USB requirements for average suspend current consumption.

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