decode47.v

Verilog HDL程序

module decode47(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'bx;
endcase
  end
endmodule