22.214.171.124. HPS Method 5: Energy Efficient Ethernet
Ethernet MAC's in the HPS support Energy Efficient Ethernet (EEE).
Refer to the “Programming Guidelines for Energy Efficient Ethernet” section in the Ethernet Media Access Controller chapter of the Cyclone V technical reference manual for detailed information on how to take advantage of this power saving standard for Ethernet.
Both sides of an Ethernet connection must support EEE in order to take full advantage of it. The Ethernet drivers in the current version of Linux for SoC fully support EEE.