This is a fork of the xge_mac and was released by the Computer Architecture Group (http://cag.uni-hd.de) of the University of Heidelberg.
Main changes in this fork:
-Unwanted FIFOs removed
-Latency reduced due to the removal of the FIFOs and a new CRC implementation
-Interface very similar to the one of the Xilinx MAC
This core is in production use.