4.14.2.1 MDI Wake-up Tone Detection - Rev D0
This section applies to devices of revision D0 and later.
In these revisions, MDI wake detection was designed to meet the OPEN Alliance 10BASE-T1S Sleep/Wake‑up Specification, version 1.0. Partial networking is supported.
The device may be configured to wake from a wake-up pulse (WUP) on the MDI interface when in the SLEEP state. The WUP consists of a preamble of six DME encoded ‘T’ symbols, 12 periods of a 625 kHz signal, and 24 to 26 DME encoded ‘J’ symbols. The device begins its wake sequence upon receiving the 625 kHz WUT. 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. Detailed timing diagrams can be found in Wake-up Signal Characteristics and Timing - Rev D0
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.