西北工业大学_数字电å­�技术基础_实验报告_实验4 - 百度文库 ÏÂÔØ±¾ÎÄ

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module run (clk,rst,out); input clk,rst; output [7:0] out; reg [7:0] out; reg [24:0] count;

always @ ( posedge clk or negedge rst ) if(!rst) begin

count<=16'b0;

end else begin

count<=count+1;

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end

always @ ( posedge clk or negedge rst)

if(!rst) begin

out<=8'hff;

end else begin

case ( count[24:21] )

0: out<=8'b1111_1110; 1: out<=8'b1111_1101; 2: out<=8'b1111_1011;

3: out<=8'b1111_0111; 4: out<=8'b1110_1111; 5: out<=8'b1101_1111; 6: out<=8'b1011_1111; 7: out<=8'b0111_1111; 8: out<=8'b1011_1111; 9: out<=8'b1101_1111; 10:out<=8'b1110_1111; 11:out<=8'b1111_0111;

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