交通灯vhdl程序，使用交通灯模块的 12个发光二极管，东西EW为主干道主干绿灯50秒，红灯30s，黄灯5s。-Vhdl program traffic lights, traffic lights use light-emitting diode module 12, East EW 50 seconds for the trunk main green, red 30s, yellow 5s.

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