I am currently trying to set up an Infiniband protocol on a Virtex 2 Pro. Therefore I use the dedicated multi gigabit transceivers (Rocket I/O s). My problem is that after finishing the link layer and testing the implementation in serial loopback mode I always get the error message from my testbench program that the synchronization gets lost. I already worked on several "standard" implementations and I often encountered false descriptions in the standard paper. Since the implementation is exactly based on the "Infiniband Architecture Specification Release 1.1" I wonder if there is already a mistake in the description? Or maybe there is another point that is not obvious I just overlooked? I would like to share my experience and knowledge with other developers who are also familiar with the Infiniband protocoll and its implementation to solve my problem. Any help is appreciated.