- module mo9(clk,clr,z,out);
- input clk,clr;
- output reg z;
- output reg [3:0] out;
- parameter s0=0,s1=1,s2=2, s3=3,s4=4, s5=5,s6=6,s7=7,s8=8;
- reg [3:0] next_state,state;
- always @(posedge clk or posedge clr)
- begin
- if(clr) state<=s0;
- else state<=next_state;
- end
- always @(state)
- begin
- case (state)
- s0: begin next_state<=s1; out<=state;end
- s1: begin next_state<=s2; out<=state;end
- s2: begin next_state<=s3; out<=state;end
- s3: begin next_state<=s4; out<=state;end
- s4: begin next_state<=s5; out<=state;end
- s5: begin next_state<=s6; out<=state;end
- s6: begin next_state<=s7; out<=state;end
- s7: begin next_state<=s8; out<=state;end
- s8: begin next_state<=s0; out<=state;end
- default: begin next_state<=s0; out<=state;end
- endcase
- end
- always @(state)
- begin
- case(state)
- s8: z<=1'b1;
- default:z<=1'b0;
- endcase
- end
- endmodule
全部资料下载地址：
 mo9.rar
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