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<##//////////////////////////////////////////////////////////////////
////                                                             ////
////  Author: Eyal Hochberg                                      ////
////          eyal@provartec.com                                 ////
////                                                             ////
////  Downloaded from: http://www.opencores.org                  ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Copyright (C) 2010 Provartec LTD                            ////
//// www.provartec.com                                           ////
//// info@provartec.com                                          ////
////                                                             ////
//// This source file may be used and distributed without        ////
//// restriction provided that this copyright statement is not   ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer.////
////                                                             ////
//// This source file is free software; you can redistribute it  ////
//// and/or modify it under the terms of the GNU Lesser General  ////
//// Public License as published by the Free Software Foundation.////
////                                                             ////
//// This source is distributed in the hope that it will be      ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied  ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR     ////
//// PURPOSE.  See the GNU Lesser General Public License for more////
//// details. http://www.gnu.org/licenses/lgpl.html              ////
////                                                             ////
//////////////////////////////////////////////////////////////////##>
 
OUTFILE PREFIX_parallel_TOPO.v
 
ITER OX ORDER
ITER CX COEFF_NUM
ITER SX ADD_STAGES
 
//  Built In Parameters:
//  
//    Filter Order             = ORDER
//    Input Precision          = DIN_BITS
//    Coefficient Precision    = COEFF_BITS
//    Sum of Products Latency  = LATENCY
//    Number of multiplayers   = COEFF_NUM
 
module PREFIX_parallel_TOPO (PORTS);
 
	input  clk;
	input  reset;
	input  clken;
	input  [EXPR(COEFF_BITS-1):0] kCX;
	input  [EXPR(DIN_BITS-1):0] data_in;
	output [EXPR(DOUT_BITS-1):0] data_out;
	output valid_out;
 
	wire [EXPR(DIN_BITS-1):0] data_in_d0;
	wire [EXPR(DIN_BITS-1):0] data_in_dEXPR(OX+1);
	reg [EXPR(MULT_BITS-1):0] multCX;
 
	//delay inputs per multiplayer
    assign data_in_d0 = data_in;
    CREATE prgen_delayN.v DEFCMD(SWAP DELAY 1) DEFCMD(DEFINE CLKEN)
    prgen_delay1_en #(DIN_BITS) delay_dinOX (clk, reset, clken, data_in_dOX, data_in_dEXPR(OX+1));
 
	always @(posedge clk or posedge reset)
	  if (reset)
	    begin
		  multCX <= #FFD {MULT_BITS{1'b0}};
	    end
      else if (clken)
	    begin
		  multCX <= #FFD kCX * data_in_dCX;
	    end
 
	//Pipline the output additions
	CREATE prgen_bintree_adder.v DEFCMD(SWAP INPUT_NUM COEFF_NUM)
	prgen_bintree_adder_COEFF_NUM #(MULT_BITS) prgen_bintree_adder(
		.clk(clk),
		.reset(reset),
		.data_inCX(multCX),
		.data_out(data_out),
		.valid_in(clken),
		.valid_out(valid_out)
	);
 
endmodule