dctu.v

离散余弦变换的verilog源代码

/////////////////////////////////////////////////////////////////////
////                                                             ////
////  Discrete Cosine Transform Unit                             ////
////                                                             ////
////  Author: Richard Herveille                                  ////
////          [e-mail]                                   ////
////          www.asics.ws                                       ////
////                                                             ////
/////////////////////////////////////////////////////////////////////
////                                                             ////
//// Copyright (C) 2001 Richard Herveille                        ////
////                    [e-mail]                         ////
////                                                             ////
//// 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 SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY     ////
//// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED   ////
//// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS   ////
//// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR      ////
//// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,         ////
//// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES    ////
//// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE   ////
//// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR        ////
//// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF  ////
//// LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT  ////
//// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT  ////
//// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE         ////
//// POSSIBILITY OF SUCH DAMAGE.                                 ////
////                                                             ////
/////////////////////////////////////////////////////////////////////

//  CVS Log
//
//  $Id: dctu.v,v 1.3 2002/10/31 12:50:03 rherveille Exp $
//
//  $Date: 2002/10/31 12:50:03 $
//  $Revision: 1.3 $
//  $Author: rherveille $
//  $Locker:  $
//  $State: Exp $
//
// Change History:
//               $Log: dctu.v,v $
//               Revision 1.3  2002/10/31 12:50:03  rherveille
//               *** empty log message ***
//
//               Revision 1.2  2002/10/23 09:06:59  rherveille
//               Improved many files.
//               Fixed some bugs in Run-Length-Encoder.
//               Removed dependency on ud_cnt and ro_cnt.
//               Started (Motion)JPEG hardware encoder project.
//


//synopsys translate_off
//`include "timescale.v"
//synopsys translate_on

module dctu(clk, ena, ddgo, x, y, ddin, dout);

	parameter coef_width = 16;
	parameter di_width = 8;
	parameter [2:0] v = 0;
	parameter [2:0] u = 0;

	//
	// inputs & outputs
	//

	input clk;
	input ena;
	input ddgo;               // double delayed go signal
	input [2:0] x, y;

	input  [di_width:1] ddin; // delayed data input
	output [11:0] dout;

	//
	// variables
	//
	reg [      31:0] coef;

	wire [coef_width +10:0] result;
	//`include "dct_cos_table"
	function [31:0] dct_cos_table;
   
	   //
	   // inputs & outputs
	   //
	   input [2:0] x,y,u,v; // table entry
   
   begin
	   //
	   // Table definition
	   //
	   // Function: cos( (2x +1) * u * pi)/16) * cos( (2y +1) * v * pi)/16)
	   //
	   // select bits:
	   // 11:9 - V
	   //  8:6 - U
	   //  5:3 - Y
	   //  2:0 - X
   
	   case ( {v,u} ) // synopsys full_case parallel_case
		   6'h00:
			   case ( {y,x} )	// synopsys full_case parallel_case
				   6'h00: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h01: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h02: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h03: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h04: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h05: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h06: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h07: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h08: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h09: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h0a: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h0b: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h0c: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h0d: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h0e: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h0f: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h10: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h11: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h12: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h13: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h14: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h15: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h16: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h17: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h18: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h19: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h1a: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h1b: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h1c: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h1d: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h1e: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h1f: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h20: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h21: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h22: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h23: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h24: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h25: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h26: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h27: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h28: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h29: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h2a: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h2b: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h2c: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h2d: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h2e: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h2f: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h30: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h31: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h32: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h33: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h34: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h35: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h36: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h37: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h38: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h39: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h3a: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h3b: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h3c: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h3d: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h3e: dct_cos_table = 32'h20000000; // = +0.500000
				   6'h3f: dct_cos_table = 32'h20000000; // = +0.500000
			   endcase
		   6'h01:
			   case ( {y,x} )	// synopsys full_case parallel_case
				   6'h00: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h01: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h02: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h03: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h04: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h05: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h06: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h07: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h08: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h09: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h0a: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h0b: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h0c: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h0d: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h0e: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h0f: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h10: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h11: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h12: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h13: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h14: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h15: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h16: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h17: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h18: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h19: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h1a: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h1b: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h1c: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h1d: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h1e: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h1f: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h20: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h21: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h22: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h23: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h24: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h25: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h26: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h27: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h28: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h29: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h2a: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h2b: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h2c: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h2d: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h2e: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h2f: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h30: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h31: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h32: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h33: dct_cos_table = 32'h08d42aef; // = +0.137950
				   6'h34: dct_cos_table = 32'hf72bd511; // = -0.137950
				   6'h35: dct_cos_table = 32'he6db9640; // = -0.392847
				   6'h36: dct_cos_table = 32'hda5f3a21; // = -0.587938
				   6'h37: dct_cos_table = 32'hd39d5e9e; // = -0.693520
				   6'h38: dct_cos_table = 32'h2c62a162; // = +0.693520
				   6'h39: dct_cos_table = 32'h25a0c5df; // = +0.587938
				   6'h3a: dct_cos_table = 32'h192469c0; // = +0.392847
				   6'h3b: dct_cos_table = 32'h08d42aef; // = +0.137950