I am trying to implement a free 10gigabit ethernet MAC(cab be found at http://opencores.com/project,xge_mac) into Spartan-6 LX150T. But the simulation shows that a couple of paths do not meet timing requirement. Therefore my company is willing to extend a contract and hire experienced people into optimizing the existing IP to fit it into Spartan-6 LXT devices. Please let me know (nxzhangxm@gmail.com) if you are interested in taking on this task. Thanks