USB4624 datasheet(26/68 Pages) SMSC

26 / 68 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

Revision 1.0 (06-17-13)

SMSC USB4624

DATASHEET

After the device is fully configured, it will go idle and then into suspend if there is no VBUS or

Hub.Connect present. Once VBUS is present, and upstream battery charging is enabled, the device

will transition to the Battery Charger Detection Stage (CHGDET). If VBUS is present, and upstream

battery charging is not enabled, the device will transitions to the Connect (Hub.Connect) stage.

5.1.6

Battery Charger Detection Stage (CHGDET)

After configuration, if enabled, the device enters the Battery Charger Detection Stage. If the battery

charger detection feature was disabled during the CONFIG stage, the device will immediately

transition to the Hub Connect (Hub.Connect) stage. If the battery charger detection feature remains

enabled, the battery charger detection sequence is started automatically.

If the charger detection remains enabled, the device will transition to the Hub.Connect stage if using

the hardware detection mechanism.

5.1.7

Hub Connect Stage (Hub.Connect)

Once the CHGDET stage is completed, the device enters the Hub.Connect stage.

5.1.8

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 Section 7.2.1, "SMBus Run Time Accessible Registers," on page 37.

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 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.

USB4624 Datenblatt(PDF) 26 Page - SMSC Corporation