获取FPGA芯片序号_dna_porte2

往往可以通过获取xilinx芯片的DNA，然后再进一步加密运算，就可以实现代码的加密。具体获取DNA的代码如下所示：

module dna_read(
	input 			sys_clk,
	input			rst_n,
	output [95:0] 	dna_read_data,
	output			dna_read_vld
);
 
wire dna_dout;
wire dna_read;
wire dna_shift;
 
   DNA_PORTE2 #(
      .SIM_DNA_VALUE(96'h0)  
   )
   DNA_PORTE2_inst (
      .DOUT(dna_dout),  
      .CLK(sys_clk),    
      .DIN(dna_dout),    
      .READ(dna_read),  
      .SHIFT(dna_shift) 
   );
   
   reg [95:0] 	dna_reg = 0;
   reg [7:0]	dna_cnt = 0;
   
always@(posedge sys_clk or negedge rst_n)
begin
	if(!rst_n)
		dna_cnt <= 0;
	else
		dna_cnt <= dna_cnt+1;
end   
assign dna_read  =(dna_cnt==8'd63)?1'b1:1'b0;
assign dna_shift =((dna_cnt>=8'd100)&&(dna_cnt<=8'd195))?1'b1:1'b0;
 
always@(posedge sys_clk or negedge rst_n)
begin
	if(!rst_n)
		dna_reg <= 0;
	else
		dna_reg <= {dna_dout,dna_reg[95:1]};
end 
 
assign dna_read_data  =dna_reg;
assign dna_read_vld =(dna_cnt==8'd196)?1'b1:1'b0;