Wake-on-LAN provides a mechanism to detect specific frames and notify the connected controller through either register status change, GPIO indication or an interrupt flag. The WoL feature within the DP83822 allows for connected devices residing above the Physical Layer to remain in a low power state until frames with the qualifying credentials are detected. Supported WoL frame types include: Magic Packet, Magic Packet with Secure-ON and Custom Pattern Match. When a qualifying WoL frame is received, the DP83822 WoL logic circuit is able to generate a user defined event (either pulses or level change) through any of the GPIO pins or a status interrupt flag to inform a connected controller that a wake event has occurred. Additionally, the DP83822 includes a CRC Gate to prevent invalid packets from triggering a wake-up event.
The Wake-on-LAN feature set includes: