led_light.v

module led_light(KEY0,LED[1:0],CLK);

input KEY0,CLK; /* CLK PIN_R8 */
output [1:0] LED; /* LED0:PIN_B5 LED1:debug */

reg [126:0] rand;
reg [6:0] offset;
reg [25:0] count = 0;


/* led output ***************************************/
	function[126:0] randc;
		input [6:0] rand;
		integer i;
		begin
			randc[6:0] = rand;
			i = 7;
			while(i < 127) begin
			randc[i] = randc[i-7]^randc[i-1];
			i = i+1;
			end	
		end
	endfunction

	function disp;
		input [6:0] j;
		input [126:0] rand;
		integer i;
		begin
			for (i = 0; i < 1; i = i + 1) begin
				disp = rand[i + j];
			end
		end
	endfunction
	
always @(posedge CLK) begin
if(count == 1250) count <= 0; /* 1250 = 25us */
else count <= count +1;
end	
assign enable = (count == 0)?1:0;
	
always @(posedge CLK) begin
	if(enable == 1) begin
		rand = randc(7'b1111111);
		offset = offset +1; end 
end

	assign LED[0] = disp(offset, rand);
/*	assign LED[1] = disp(offset, rand); debug*/

	/* LED output end ************************** */
/* *********************************************** */
endmodule