Giga Bit ethernet has full duplex only

http://sqlblog.com/blogs/joe_chang/archive/2010/03/23/gigabit-and-full-duplex.aspx

Giga bit only autonegotiates.

Fast memcpy in c

http://www.danielvik.com/2010/02/fast-memcpy-in-c.html

i.MX6UL ENET source in linux

http://www.oryx-embedded.com/doc/mk60__eth_8c_source.html