module zero_count(
	Code,//输入码字
	count//返回第一个1前0的个数
    );
	input [15:0]Code;
	output [3:0]count;

	reg [3:0]count;

	always @(*) 
		begin
			if(Code[15:0]==16'b1000_0000_0000_0000)
				count=4'd15;
			else if(Code[14:0]==15'b100_0000_0000_0000)
				count=4'd14;
			else if(Code[13:0]==14'b10_0000_0000_0000)
				count=4'd13;
			else if(Code[12:0]==13'b1_0000_0000_0000)
				count=4'd12;
			else if(Code[11:0]==12'b1000_0000_0000)
				count=4'd11;
			else if(Code[10:0]==11'b100_0000_0000)
				count=4'd10;
			else if(Code[9:0]==10'b10_0000_0000)
				count=4'd9;
			else if(Code[8:0]==9'b1_0000_0000)
				count=4'd8;
			else if(Code[7:0]==8'b1000_0000)
				count=4'd7;
			else if(Code[6:0]==7'b100_0000)
				count=4'd6;
			else if(Code[5:0]==6'b10_0000)
				count=4'd5;
			else if(Code[4:0]==5'b1_0000)
				count=4'd4;
			else if(Code[3:0]==4'b1000)
				count=4'd3;
			else if(Code[2:0]==3'b100)
				count=4'd2;
			else if(Code[1:0]==2'b10)
				count=4'd1;
			else if(Code[0]==1'b1)
				count=4'd0;
			else
				count=4'bxxxx;
		end

endmodule