10G/25G High Speed Ethernet Subsystem v1.2 Product Guide - 1.2 English - This subsystem implements the 25G Ethernet Media Access Controller (MAC) with a Physical Coding Sublayer (PCS) as specified by the 25G Ethernet Consortium. MAC and PCS/PMA or PCS/PMA alone are available. Legacy operation at 10 Gb/s is supported. The subsystem is delivered as a netlist targeted for Xilinx devices.