4.13.2.1 MDI Wake-up Activity Detection - Rev C2

This section applies to product LAN8670/1/2 revision C2 and earlier.

In these versions, MDI wake detection was not designed to meet the OPEN Alliance 10BASE-T1S Sleep/Wake‑up Specification, version 1.0. Received energy that is of sufficient length that is detected either from other nodes transmitting onto the segment or from noise will trigger the device to wake when MDI wake-up is enabled. Partial networking is not supported.

The device may be configured to wake from activity on the MDI interface when in the SLEEP state. The device monitors activity energy on TRXP/TRXN. Continuous activity must be detected for a minimum amount of time to ensure that false positive wake events are not caused by impulse noise; this time is documented in the Wake-up Signal Characteristics and Timing - Rev C2 section. Once a valid wake event is detected, the INH pin is driven high to the VDDAU supply to re-enable external power supplies and wake the system.

Wake from MDI is enabled by writing a ’1’ to the MDI Wake Enable (MDIWKEN) bit in the Sleep Control 0 (SLPCTL0) register prior to entering the SLEEP state.