Abstract：This design through the VHDL hardware description language to describe the structure of the digital system, behavior, function and interface. VHDL language programming from time to time through the detection time information, the use of EDA tools for logic synthesis and optimization of timing, as the police traffic control lights, and finally through the completion of the corresponding system description, simulation, integration and verification link, until the last generation of devices needed, so as to achieve the purpose of traffic control.
Key word:VHDL; circuit design; timer ;display light.
