文件名称:traffic_Light
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模拟十字路*通灯的VHDL程序，附有用与配合ModelSim的仿真程序。
内容：交通灯设计
（1）A，B方向各有红，黄，绿灯，初始态全为红灯，之后东西方向通车，绿灯灭后，黄灯闪烁，各路口通车时间为30秒，由两个七段数码管计数，当显示时间小于3秒的时候通车方向黄灯闪烁
（2）系统时钟1KHz，黄灯闪烁时钟要求为2Hz，七段码管的时间显示为1Hz脉冲，即1秒递减一次，在显示时间小于3秒时，通车方向的黄灯以2Hz的频率闪烁，系统中加入外部复位信号。
（3）用ModelSim做仿真
-VHDL program simulate the crossroads of traffic lights, accompanied with the ModelSim simulation program. : Traffic light design (1) A, B, the direction of each red, yellow, green, and the initial state of all the red, the east-west direction after the opening of the green off, flashing yellow light, the intersection open to traffic for 30 seconds by two seven segment LED count, (2) the opening of the direction of the yellow light flashes when the display time is less than 3 seconds when the system clock 1KHz, flashing yellow light clock requirements for 2Hz, seven segment tubes 1Hz pulse, that is a seconds, decreasing the display time of less than 3 seconds, the opening direction of the yellow light is flashing, the system by adding an external reset signal frequency of 2Hz. (3) with ModelSim simulation
内容：交通灯设计
（1）A，B方向各有红，黄，绿灯，初始态全为红灯，之后东西方向通车，绿灯灭后，黄灯闪烁，各路口通车时间为30秒，由两个七段数码管计数，当显示时间小于3秒的时候通车方向黄灯闪烁
（2）系统时钟1KHz，黄灯闪烁时钟要求为2Hz，七段码管的时间显示为1Hz脉冲，即1秒递减一次，在显示时间小于3秒时，通车方向的黄灯以2Hz的频率闪烁，系统中加入外部复位信号。
（3）用ModelSim做仿真
-VHDL program simulate the crossroads of traffic lights, accompanied with the ModelSim simulation program. : Traffic light design (1) A, B, the direction of each red, yellow, green, and the initial state of all the red, the east-west direction after the opening of the green off, flashing yellow light, the intersection open to traffic for 30 seconds by two seven segment LED count, (2) the opening of the direction of the yellow light flashes when the display time is less than 3 seconds when the system clock 1KHz, flashing yellow light clock requirements for 2Hz, seven segment tubes 1Hz pulse, that is a seconds, decreasing the display time of less than 3 seconds, the opening direction of the yellow light is flashing, the system by adding an external reset signal frequency of 2Hz. (3) with ModelSim simulation
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top.v
led_test.v
led_test.v