此程序是以VHDL来设计真实世界交通灯控制系统。经过下载到FPGA中调试，证明其真实可用。为了方便调用，特地将程序分成两个部分，包括主函数和一个数码管显示子程序。-This program is based on VHDL to design real-world traffic light control system. Been downloaded to the FPGA debugging, to prove its real available. Order to facilitate