怎么用Verilog HDL 编写一个七段LED译码器

Question

如题所述

Answer 1

module decode4_7(a,b,c,d,e,f,g,D3,D2,D1,D0);
output a,b,c,d,e,f,g;
input D3,D2,D1,D0;
reg a,b,c,d,e,f,g;
always @(D3 or D2 or D1 or D0)
begin
case({D3,D2,D1,D0})
4’d0:{a,b,c,d,e,f,g}=7’b1111110;
4’d1:{a,b,c,d,e,f,g}=7’b0110000;
4’d2:{a,b,c,d,e,f,g}=7’b1101101;
4’d3:{a,b,c,d,e,f,g}=7’b1111001;
4’d4:{a,b,c,d,e,f,g}=7’b0110011;
4’d5:{a,b,c,d,e,f,g}=7’b1011011;
4’d6:{a,b,c,d,e,f,g}=7’b1011111;
4’d7:{a,b,c,d,e,f,g}=7’b1110000;
4’d8:{a,b,c,d,e,f,g}=7’b1111111;
4’d9:{a,b,c,d,e,f,g}=7’b1111011;
default:{a,b,c,d,e,f,g}=7’b00000000;
endcase
end
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