`timescale 1ns / 100ps//////////////////////////////////////////////////////////////////////////////////// Company: // Engineer: // // Create Date:    21:19:50 07/21/2007 // Design Name: // Module Name:    shake // Project Name: // Target Devices: // Tool versions: // Description: //// Dependencies: //// Revision: // Revision 0.01 - File Created// Additional Comments: ////////////////////////////////////////////////////////////////////////////////////module noshake(clk, b1, b2, b3, b4, noshakeb1, noshakeb2, noshakeb3, noshakeb4);    input clk;    input b1;    input b2;    input b3;    input b4;    output noshakeb1;    output noshakeb2;    output noshakeb3;    output noshakeb4;	 	 parameter shaketime = 21'd1000000;	 //parameter shaketime = 18'h0000f;	 reg counten;	 reg[20:0] shakecount;	 reg sample;	 reg noshakeb2,noshakeb3,noshakeb4;	 
	 assign noshakeb1 = b1;	 	 always @( posedge clk or negedge b1) begin		if(b1 == 0)begin shakecount<=0; sample <=0; end		else begin			if(shakecount == shaketime)begin shakecount<=0; sample<=1; end			else begin shakecount<=shakecount+1; sample<=0;end		end	 end	 always @(posedge sample or negedge b1) begin		 if(b1 == 0) begin
		 	{noshakeb2,noshakeb3,noshakeb4}<=3'b111;
		 end
		 else begin			 
			 if(b4 == 0){noshakeb2,noshakeb3,noshakeb4}<=3'b110;
			 else if(b3 == 0){noshakeb2,noshakeb3,noshakeb4}<=3'b101;
			 else if(b2 == 0){noshakeb2,noshakeb3,noshakeb4}<=3'b011;
			 else  {noshakeb2,noshakeb3,noshakeb4}<=3'b111;
		 end
		 	 endendmodule