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The FlexRay communication system is an emerging standard for advanced automotive control applications, such as drive-by-wire. The detailed microarchitectural level of the FlexRay specification facilitates implementations where the internal operation closely reflects the protocol specification definitions. Corresponding functional coverage models in the verification environment can also be defined relative to the FlexRay specification which enables consistent understanding, easier maintenance and better reuse. This paper explores the general issues of functional coverage pertaining to the FlexRay specifications. VHDL simulation & FPGA synthesis results of communication controller of flexray controller are presented. The results of Flexray communication controller with help XILINX tools for simulation.