Verilog HDL交通灯的实现

在家实在闲的没事儿干，翻出来了大三上学期的EDA课的小实验，也就是设计一个二愣子交通灯啦，只会本身按设定好的时间闪,红灯、绿灯，黄灯和转向灯；

• 各灯显示时长：哎呀~ 懒得写了，后面程序里都有。
• 芯片：FPGA、Cylone IV E 系列的 EP4CE6E22C8，144引脚。
• 外置时钟：1Hz

如下是这个小实验的完整的程序：

module	traffic(
			input clk,
			output reg r1,
			output reg y1,
			output reg g1,
			output reg b1,
			output reg r2,
			output reg y2,
			output reg g2,
			output reg b2
			);
		parameter yellow_time = 5;
		parameter green_time  = 20;
		parameter blue_time = 10;
		reg [2:0] state;

		always @(posedge clk)
			case (state)
				0:		/*南北绿，东西红*/
					begin
						r1 <= 1'b0;
						y1 <= 1'b0;
						g1 <= 1'b1;
						b1 <= 1'b0;
						r2 <= 1'b1;
						y2 <= 1'b0;
						g2 <= 1'b0;
					   b2 <= 1'b0;
					end
				1:		/*南北黄，东西红*/
					begin
						r1 <= 1'b0;
						y1 <= 1'b1;
						g1 <= 1'b0;
						b1 <= 1'b0;
						r2 <= 1'b1;
						y2 <= 1'b0;
						g2 <= 1'b0;
						b2 <= 1'b0;
					end
				2:		/*南北左转，东西红*/
					begin
						r1 <= 1'b0;
						y1 <= 1'b0;
						g1 <= 1'b0;
						b1 <= 1'b1;
						r2 <= 1'b1;
						y2 <= 1'b0;
						g2 <= 1'b0;
						b2 <= 1'b0;
					end
				3:	/*南北红，东西绿*/
					begin
						r1 <= 1'b1;
						y1 <= 1'b0;
						g1 <= 1'b0;
						b1 <= 1'b0;
						r2 <= 1'b0;
						y2 <= 1'b0;
						g2 <= 1'b1;
						b2 <= 1'b0;
					end
				4:	/*南北红，东西黄*/
					begin
						r1 <= 1'b1;
						y1 <= 1'b0;
						g1 <= 1'b0;
						b1 <= 1'b0;
						
						r2 <= 1'b0;
						y2 <= 1'b1;
						g2 <= 1'b0;
						b2 <= 1'b0;
					end
				
				
			default:	/*南北红，东西左转*/
				begin
					r1 <= 1'b1;
					y1 <= 1'b0;
					g1 <= 1'b0;
					b1 <= 1'b0;
					r2 <= 1'b0;
					y2 <= 1'b0;
					g2 <= 1'b0;
					b2 <= 1'b1;
				end
			endcase
		
		always @(posedge clk)
			begin
				reg [4:0] count;
				begin
					if(count == 0)
						begin
							if(state == 5)
								state <= 0;
							else 
								state <= state +1;
							case	(state)
								0:
									count = yellow_time;
								1:
									count = blue_time;
								2:
									count =  green_time;
								3:
									count = yellow_time;
								4:
									count = blue_time;
								default:
									count = green_time;
							endcase
						end
					else
						count = count - 1;				
				end 			
			end 
endmodule

这个是引脚配置，书上都有哒，就是顺序总是配反，搞得我改了好几遍（其实本人很细心得啦QAQ）。

这个是最后的那个原理图