4.13.4.3 Manual Wake Assertion

Any time that the LAN8670/1/2 is powered up in the ACTIVE state, the host controller may request that the device generate wake-up event.

A manual wake forward event is activated by writing a ‘1’ to the Manual Wake Forward (MWKFWD) bit in the Sleep Control 1 (SLPCTL1) register. Other bits in the same register will set the type of wake event and should be written appropriately. To trigger wake activity on the MDI, the MDI Wake Forward Enable (MDIWFWD) bit must be set. To trigger wake pulse on the WAKE_OUT pin, the WAKE_OUT Forward Enable (WKOFWDEN) bit must be set. Both modes may be triggered at the same time. If neither is set, no wake event is generated. Once the wake events have completed, the device will clear the MWKFWD bit, but the forwarding enable bits will hold their values.