注意:我这里是共阳极的二极管,要变成共阴极,只要把所有的输出取反就行.

module changer(IN,OUT);

input [3:0]IN;

output [7:0]OUT;

reg[7:0] OUT;

always

begin

case(IN)

'b0000 : OUT = 'b11000000;

'b0001 : OUT = 'b11111001;

'b0010 : OUT = 'b10100100;

'b0011 : OUT = 'b10110000;

'b0100 : OUT = 'b10011001;

'b0101 : OUT = 'b10010010;

'b0110 : OUT = 'b10000010;

'b0111 : OUT = 'b11111000;

'b1000 : OUT = 'b10000000;

'b1001 : OUT = 'b10010000;

'b1010 : OUT = 'b10001000;

'b1011 : OUT = 'b10000011;

'b1100 : OUT = 'b11000110;

'b1101 : OUT = 'b10100001;

'b1110 : OUT = 'b10000110;

'b1111 : OUT = 'b10001110;

endcase

end

endmodule