Description: 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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led_test.v
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