bin27seg.v

Verilog 经典实例

/*------------------------------------------------------------------------------------
-- DESCRIPTION   :   BIN to seven segments converter
--                   segment encoding
--                        a
--                      +---+ 
--                    f |   | b
--                      +---+  <- g
--                    e |   | c
--                      +---+
--                        d
--                  Outputs (data_out) active         : low
------------------------------------------------------------------------------------*/

module bin27seg
  (
	data_in,
	data_out
  );
	input [3:0]    data_in;
	output [6:0]   data_out;
	
	reg [6:0] data_out;
	
	always @ (data_in)
	begin
		case (data_in)
			4'b0000 : data_out <= 7'b1000000;  //0
			4'b0001 : data_out <= 7'b1111001;  //1
			4'b0010 : data_out <= 7'b0100100;  //2
			4'b0011 : data_out <= 7'b0110000;  //3
			4'b0100 : data_out <= 7'b0011001;  //4
			4'b0101 : data_out <= 7'b0010010;  //5
			4'b0110 : data_out <= 7'b0000011;  //6
			4'b0111 : data_out <= 7'b1111000;  //7
			4'b1000 : data_out <= 7'b0000000;  //8
			4'b1001 : data_out <= 7'b0011000;  //9
			4'b1010 : data_out <= 7'b0001000;  //A
			4'b1011 : data_out <= 7'b0000011;  //b
			4'b1100 : data_out <= 7'b0100111;  //c
			4'b1101 : data_out <= 7'b0100001;  //d
			4'b1110 : data_out <= 7'b0000110;  //E
			4'b1111 : data_out <= 7'b0001110;  //F
			default : data_out <= 7'b0000000;
		endcase
	end
	
endmodule