/********************************************************************************    File Name:  ref_cntr.v*      Version:  1.14*         Date:  Sept 9, 1999*  Description:  Refresh Counter **      Company:  Xilinx***   Disclaimer:  THESE DESIGNS ARE PROVIDED "AS IS" WITH NO WARRANTY *                WHATSOEVER AND XILINX SPECIFICALLY DISCLAIMS ANY *                IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR*                A PARTICULAR PURPOSE, OR AGAINST INFRINGEMENT.**                Copyright (c) 1998 Xilinx, Inc.*                All rights reserved*******************************************************************************/module ref_cntr (/*AUTOARG*/   // Outputs   auto_ref, p_auto_ref,    // Inputs   Reset, Clk, clr_ref, ref_max   );   output        auto_ref, p_auto_ref;   input [15:0] ref_max;   input 	Reset, Clk, clr_ref;   wire 	clr_ref;   reg 		auto_ref, p_auto_ref;   reg [15:0] 	rcount, count_N;   always @ (posedge Clk or negedge Reset)     if (~Reset) begin	rcount <= ref_max;	auto_ref <= 0;     end     else begin	rcount <= count_N;	if (rcount == 16'h0000)	  auto_ref <= 1;	if (clr_ref) 	begin	   auto_ref <= 0;	   p_auto_ref <= 0;	end		if (rcount == 16'h0003)	  p_auto_ref <= 1;     end         always @ (rcount or ref_max)     if (rcount == 16'h0000)       count_N = ref_max;     else       count_N = rcount - 1;	endmodule