设计一四位计数器

学院：信息技术学院班级：

专业：电子信息科学与技术姓名：

日期：学号：

1、熟悉行为级语法；

2、熟悉有限状态机

设计一四位计数器，进行仿真，并检测输出结果；

提示：在时钟上升沿，如果复位信号有效，则复位为0,如果复位信号无效，则计数器需要加一。

完成一个序列信号电路检测器，检测信号为10010，当检测到此序列时输出端口输出高电平，其余时间输出低电平。

提示：先画出状态转换图或写出状态转换表，根据状态表或者状态图完成代码的设计；

编写测试模块对该功能模块进行仿真。要求实验报告包括完整的状态转化图或者转化表。

序列信号电路检测器：

module mian (z, x, clock, clear);

output z;

reg z;

input clock, clear;

input x;

parameter s0 = 3'd0,

s1 = 3'd1,

s2 = 3'd2,

s3 = 3'd3,

s5 = 3'd5,

s4 = 3'd4;

reg [2:0] state;

reg [2:0] next_state;

always @(posedge clock) if(clear)

state <= s0;

else

state <= next_state;

always @(state)

begin

case(state)

s0: show = 0;

s1: show = 0;

s2: show = 0;

s3: show = 0;

s4: show = 0;

s5: show = 1; endcase

end

always @(x or state) begin

case(state)

s0: if(x == 0)

next_state = s0;

else

next_state = s1;

s1: if(x == 0)

next_state = s2;

else

next_state = s1;

s2: if(x == 0)

next_state = s3;

else

next_state = s1;

s3: if(x == 0)

next_state = s0;

else

next_state = s4;

s4: if(x == 0)

next_state = s5;

else

next_state = s1;

s5: if(x == 0)

next_state = s0;

else

next_state = s1;

endcase

end

endmodule

module stimulus_mv;

wire z;

reg x;

reg clock, clear; mianMVP(z, x, clock, clear);

initial

begin clock = 0;

forever #5 clock = ~clock;

end

initial

begin

clear = 1;

repeat(2)@(negedge clock);

clear = 0;

end

initial

begin

#30 x = 1;

#10 x = 0;

#10 x = 0;

#10 x = 1;

#10 x = 0;

end

endmodule

1.输出：

四位计数器

3.1功能块代码

module counter(out, clock, clear);

output out;

input clock, clear;

reg [3:0] out;

always @(posedge clock or negedge clear) begin

if(clear)

out <= 4'd0;

else

out <= out + 1;

end

endmodule

3.2测试模块代码

module counter_stimulus;

reg clock, clear;

wire [3:0] out;

initial

$monitor($time, "count = %b , clear = %b", out[3:0], clear); counter MVP(out, clock, clear);

always

begin

clear = 1'b1;

#15 clear = 1'b0;

#200 clear = 1'b1;

#50 clear = 1'b1;

end

initial

begin

clock = 1'b0;

forever #5 clock = ~clock;

end

initial

begin

#400 $Finish;

end

endmodule

4分析总结

4.1遇到的问题及解决方法4.2实验心得及存在的问题