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module clock(ctr,yout,clk,clr); input clk,clr; output[6:0] yout; output[1:0] ctr; reg[6:0] yout; reg[4:1] temp; reg[4:1] temp_a,temp_b; reg[1:0] ctr; reg state; reg c; reg[10:0] cp; parameter s0=2'h0,s1=2'h1; always @ (posedge clk or negedge clr) begin if(!clr) begin state=s0 ; ctr=0 ; end else begin case (state) s0:begin ctr=2'b10; temp=temp_a; state=s1; end s1:begin ctr=2'b01; temp=temp_b; state=s0; end endcase if(cp==2) begin c=1; cp=0; end else begin cp=cp+1; c=0; end end end
always @(posedge clk ) begin if(!clr){temp_a,temp_b}=0; else begin if(c==1) begin if({temp_a,temp_b}==8'h59) {temp_a,temp_b}=0; else if(temp_b==9) begin temp_b=0;temp_a=temp_a+1; end else temp_b=temp_b+1; end end end
always @ (temp) begin case(temp) 4'd0:yout=7'b1111110; 4'd1:yout=7'b0110000; 4'd2:yout=7'b1101101; 4'd3:yout=7'b1111001; 4'd4:yout=7'b0110011; 4'd5:yout=7'b1011011; 4'd6:yout=7'b1011111; 4'd7:yout=7'b1110000; 4'd8:yout=7'b1111111; 4'd9:yout=7'b1111011; default:yout=7'b0000000; endcase end endmodule 其余部分程序： 1.10進制計數器文本輸入 module CNT10(clk,clr,en,cout,q); input clk,en,clr; output[3:0] q; output cout; reg [3:0] q1; reg cout; assign q= q1; always @(posedge clk or negedge clr) begin if (!clr) q1<=0; else if(en) begin if(q1<9) q1<=q1+1; else q1<=4'b0000; end end always @(q1) if (q1==4'h9) cout= 1'b1; else cout= 1'b0; endmodule 2.8-3優先級編碼器 Case語句實現 module bm8_3 ( din ,yout); input [7:0] din ; wire [7:0] din ; output [2:0] yout ; reg [2:0] yout; always @ ( din ) begin case ( din ) 8'b0000_0001 : b<=3'b000; 8'b0000_0010 : b<=3'b001; 8'b0000_0100 : b<=3'b010; 8'b0000_1000 : b<=3'b011; 8'b0001_0000 : b<=3'b100; 8'b0010_0000 : b<=3'b101; 8'b0100_0000 : b<=3'b110; 8'b1000_0000 : b<= 3'b111; default : b<= 3'b000; endcase end endmodule if語句實現 module yxbm8_3 ( A ,I ,GS ,EO ,EI );
input [7:0] I ; wire [7:0] I ; output [2:0] A ; reg [2:0] A ; always @ ( I ) if ( I[0] == 0 ) A <= 3'b000; else if ( I[1] == 0 ) A <= 3'b001; else if ( I[2] == 0 ) A <= 3'b010; else if ( I[3] == 0 ) A <= 3'b011; else if ( I[4] == 0 ) A <= 3'b100; else if ( I[5] == 0 ) A <= 3'b101; else if ( I[6] == 0 ) A <= 3'b110; else if ( I[7] == 0 ) A <= 3'b111; else if ( I == 8'b11111111) A <= 3'b111; end endmodule
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