/////////////////////////////////////////////////////////////////////////                                                             ////////  Discrete Cosine Transform Testbench (ITU-T.81 & ITU-T.83)  ////////                                                             ////////  Author: Richard Herveille                                  ////////          richard@asics.ws                                   ////////          www.asics.ws                                       ////////                                                             /////////////////////////////////////////////////////////////////////////////                                                             //////// Copyright (C) 2002 Richard Herveille                        ////////                    richard@asics.ws                         ////////                                                             //////// 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: bench_top.v,v 1.1 2002/10/23 09:07:01 rherveille Exp $////  $Date: 2002/10/23 09:07:01 $//  $Revision: 1.1 $//  $Author: rherveille $//  $Locker:  $//  $State: Exp $//// Change History://               $Log: bench_top.v,v $//               Revision 1.1  2002/10/23 09:07:01  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.////`include "timescale.v"module bench_top();	////////////////////////////////////////////////////////////////////	//                                                                //	// ITU-T.81, ITU-T.83 & Coefficient resolution notes              //	//                                                                //	////////////////////////////////////////////////////////////////////	//                                                                //	// Worst case error (all input values -128) is                    //	// zero (i.e. no errors) when using 15bit coefficients            //	//                                                                //	// Using less bits for the coefficients produces a biterror       //	// approx. equal to (15 - used_coefficient-bits).                 //	// e.g. 14bit coefficients, errors in dout-bit[0] only            //	//      13bit coefficients, errors in dout-bits[1:0]              //	//      12bit coefficients, errors in dout-bits[2:0] etc.         //	// Tests with real non-continous tone image data have shown that  //	// even when using 13bit coefficients errors remain in the lsb    //	// only (i.e. FDCT dout-bit[0])                                   //	//                                                                //	// The amount of coefficient-bits needed is dependent on the      //	// desired quality.                                               //	// The JPEG-standard compliance specs.(ITU-T.83) prescribe        //	// that the output of the combined DCT AND Quantization unit      //	// shall not exceed 1 for the desired quality.                    //	//                                                                //	// This means for high quantization levels, lesser bits           //	// for the DCT unit can be used.                                  //	//                                                                //	// Looking at the recommended "quantization tables for generic    //	// compliance testing of DCT-based processes" (ITU-T.83 annex B)  //	// it can be noticed that relatively large quantization values    //	// are being used. Errors in the lower-order bits should          //	// therefore not be visible.                                      //	// Tests with real continuous and non-continous tone image data   //	// have shown that when using the example quantization tables     //	// from ITU-T.81 annex K, 10bits coefficients are sufficient to   //	// comply to the ITU-T.83 specs. Compliance tests have been met   //	// using as little as 9bit coefficients.                          //	// For certain applications some of the lower-order bits could    //	// actually be discarded. When looking at the luminance and       //	// chrominance example quantization tables (ITU-T.81 annex K)     //	// it can be seen that the smallest quantization value is ten     //	// (qnt_val_min = 10). This means that the lower 2bits can be     //	// discarded (set to zero '0') without having any effect on the   //	// final result. In this example 11 bit or 12 bit coefficients    //	// would be sufficient.                                           //	//                                                                //	////////////////////////////////////////////////////////////////////	parameter coef_width = 13; //9;	// amount of 8x8 data packets to use for tests (current max. = 4)	parameter input_lists_start = 1;	parameter input_lists_end = 4;	//	// internal wires	//	reg clk;	reg rst;	reg dstrb;	reg [7:0] din;	wire den;	wire [10:0] dout;	wire [ 3:0] size, rlen;	wire [11:0] amp;	reg [ 7:0] input_list  [(input_lists_end*64) -1:0];	reg [7:0] qnt_list [63:0];	wire [5:0] qnt_cnt;	reg [7:0] qnt_val;	integer x,y;	integer n, list_cnt;	//	// JPEG Encoder unit	//	jpeg_encoder #(coef_width)	jpeg_enc (		.clk(clk),		.ena(1'b1),		.rst(rst),		.dstrb(dstrb),		.din(din),		.qnt_val(qnt_val),		.qnt_cnt(qnt_cnt),		.size(size),		.rlen(rlen),		.amp(amp),//		.dout(dout),		.douten(den)	);	// generate Quantization memory	always @(posedge clk)	  qnt_val <= #1 qnt_list[qnt_cnt];	// hookup checker-modules	fdct_qnr_checker #(input_lists_start, input_lists_end)	output_check (		.clk(clk),		.rst(rst),		.dstrb(jpeg_enc.dqnr_doe),		.din(jpeg_enc.qnr_dout)	);	//	// testbench body	//	// generate clock	always #2.5 clk <= ~clk;	// initial statements	initial	begin	// waves statement	`ifdef WAVES	   $shm_open("waves");	   $shm_probe("AS",bench_top,"AS");	   $display("INFO: Signal dump enabled ...\n\n");	`endif		//		// fill input-table		//		// input list 1		input_list[00] <= 8'd139;		input_list[01] <= 8'd144;		input_list[02] <= 8'd149;		input_list[03] <= 8'd153;		input_list[04] <= 8'd155;		input_list[05] <= 8'd155;		input_list[06] <= 8'd155;		input_list[07] <= 8'd155;		input_list[08] <= 8'd144;		input_list[09] <= 8'd151;		input_list[10] <= 8'd153;		input_list[11] <= 8'd156;		input_list[12] <= 8'd159;		input_list[13] <= 8'd156;		input_list[14] <= 8'd156;		input_list[15] <= 8'd156;		input_list[16] <= 8'd150;		input_list[17] <= 8'd155;		input_list[18] <= 8'd160;		input_list[19] <= 8'd163;		input_list[20] <= 8'd158;		input_list[21] <= 8'd156;		input_list[22] <= 8'd156;		input_list[23] <= 8'd156;		input_list[24] <= 8'd159;		input_list[25] <= 8'd161;		input_list[26] <= 8'd162;		input_list[27] <= 8'd160;		input_list[28] <= 8'd160;		input_list[29] <= 8'd159;		input_list[30] <= 8'd159;		input_list[31] <= 8'd159;		input_list[32] <= 8'd159;		input_list[33] <= 8'd160;		input_list[34] <= 8'd161;		input_list[35] <= 8'd162;		input_list[36] <= 8'd162;		input_list[37] <= 8'd155;		input_list[38] <= 8'd155;		input_list[39] <= 8'd155;		input_list[40] <= 8'd161;		input_list[41] <= 8'd161;		input_list[42] <= 8'd161;		input_list[43] <= 8'd161;		input_list[44] <= 8'd160;		input_list[45] <= 8'd157;		input_list[46] <= 8'd157;		input_list[47] <= 8'd157;		input_list[48] <= 8'd162;		input_list[49] <= 8'd162;		input_list[50] <= 8'd161;		input_list[51] <= 8'd163;		input_list[52] <= 8'd162;		input_list[53] <= 8'd157;		input_list[54] <= 8'd157;		input_list[55] <= 8'd157;		input_list[56] <= 8'd162;		input_list[57] <= 8'd162;		input_list[58] <= 8'd161;		input_list[59] <= 8'd161;		input_list[60] <= 8'd163;		input_list[61] <= 8'd158;		input_list[62] <= 8'd158;		input_list[63] <= 8'd158;		// input list 2		input_list[064] <= 8'd0;		input_list[065] <= 8'd0;		input_list[066] <= 8'd0;		input_list[067] <= 8'd0;		input_list[068] <= 8'd0;		input_list[069] <= 8'd0;		input_list[070] <= 8'd0;		input_list[071] <= 8'd0;		input_list[072] <= 8'd0;		input_list[073] <= 8'd0;		input_list[074] <= 8'd0;		input_list[075] <= 8'd0;		input_list[076] <= 8'd0;		input_list[077] <= 8'd0;		input_list[078] <= 8'd0;		input_list[079] <= 8'd0;		input_list[080] <= 8'd0;		input_list[081] <= 8'd0;		input_list[082] <= 8'd0;		input_list[083] <= 8'd0;		input_list[084] <= 8'd0;		input_list[085] <= 8'd0;		input_list[086] <= 8'd0;		input_list[087] <= 8'd0;		input_list[088] <= 8'd0;		input_list[089] <= 8'd0;		input_list[090] <= 8'd0;		input_list[091] <= 8'd0;		input_list[092] <= 8'd0;		input_list[093] <= 8'd0;		input_list[094] <= 8'd0;		input_list[095] <= 8'd0;		input_list[096] <= 8'd0;		input_list[097] <= 8'd0;		input_list[098] <= 8'd0;		input_list[099] <= 8'd0;		input_list[100] <= 8'd0;		input_list[101] <= 8'd0;		input_list[102] <= 8'd0;		input_list[103] <= 8'd0;		input_list[104] <= 8'd0;		input_list[105] <= 8'd0;		input_list[106] <= 8'd0;		input_list[107] <= 8'd0;		input_list[108] <= 8'd0;		input_list[109] <= 8'd0;		input_list[110] <= 8'd0;		input_list[111] <= 8'd0;		input_list[112] <= 8'd0;		input_list[113] <= 8'd0;		input_list[114] <= 8'd0;		input_list[115] <= 8'd0;		input_list[116] <= 8'd0;		input_list[117] <= 8'd0;		input_list[118] <= 8'd0;		input_list[119] <= 8'd0;		input_list[120] <= 8'd0;		input_list[121] <= 8'd0;		input_list[122] <= 8'd0;		input_list[123] <= 8'd0;		input_list[124] <= 8'd0;		input_list[125] <= 8'd0;		input_list[126] <= 8'd0;		input_list[127] <= 8'd0;		// input list 3		input_list[128] <= 8'd70;		input_list[129] <= 8'd72;		input_list[130] <= 8'd70;		input_list[131] <= 8'd70;		input_list[132] <= 8'd72;		input_list[133] <= 8'd68;		input_list[134] <= 8'd68;		input_list[135] <= 8'd64;		input_list[136] <= 8'd103;		input_list[137] <= 8'd101;		input_list[138] <= 8'd103;		input_list[139] <= 8'd100;		input_list[140] <= 8'd99;		input_list[141] <= 8'd97;		input_list[142] <= 8'd94;		input_list[143] <= 8'd94;		input_list[144] <= 8'd132;		input_list[145] <= 8'd132;		input_list[146] <= 8'd132;		input_list[147] <= 8'd130;		input_list[148] <= 8'd129;		input_list[149] <= 8'd129;		input_list[150] <= 8'd125;		input_list[151] <= 8'd121;		input_list[152] <= 8'd157;		input_list[153] <= 8'd157;		input_list[154] <= 8'd155;		input_list[155] <= 8'd154;		input_list[156] <= 8'd153;		input_list[157] <= 8'd150;		input_list[158] <= 8'd148;		input_list[159] <= 8'd145;		input_list[160] <= 8'd168;		input_list[161] <= 8'd163;		input_list[162] <= 8'd164;		input_list[163] <= 8'd162;		input_list[164] <= 8'd163;		input_list[165] <= 8'd161;		input_list[166] <= 8'd161;		input_list[167] <= 8'd156;		input_list[168] <= 8'd172;		input_list[169] <= 8'd170;		input_list[170] <= 8'd165;		input_list[171] <= 8'd166;		input_list[172] <= 8'd163;		input_list[173] <= 8'd163;		input_list[174] <= 8'd162;		input_list[175] <= 8'd158;		input_list[176] <= 8'd174;		input_list[177] <= 8'd170;		input_list[178] <= 8'd167;		input_list[179] <= 8'd167;		input_list[180] <= 8'd164;		input_list[181] <= 8'd163;		input_list[182] <= 8'd164;		input_list[183] <= 8'd159;		input_list[184] <= 8'd174;		input_list[185] <= 8'd173;		input_list[186] <= 8'd170;		input_list[187] <= 8'd167;		input_list[188] <= 8'd167;		input_list[189] <= 8'd166;		input_list[190] <= 8'd166;		input_list[191] <= 8'd160;		// input list 4		input_list[192] <= 8'd151;		input_list[193] <= 8'd147;		input_list[194] <= 8'd152;		input_list[195] <= 8'd140;		input_list[196] <= 8'd138;		input_list[197] <= 8'd125;		input_list[198] <= 8'd136;		input_list[199] <= 8'd160;		input_list[200] <= 8'd157;		input_list[201] <= 8'd148;		input_list[202] <= 8'd152;		input_list[203] <= 8'd137;		input_list[204] <= 8'd124;		input_list[205] <= 8'd105;		input_list[206] <= 8'd108;		input_list[207] <= 8'd144;		input_list[208] <= 8'd152;		input_list[209] <= 8'd151;		input_list[210] <= 8'd146;		input_list[211] <= 8'd128;		input_list[212] <= 8'd99;		input_list[213] <= 8'd73;		input_list[214] <= 8'd75;		input_list[215] <= 8'd116;		input_list[216] <= 8'd154;		input_list[217] <= 8'd148;		input_list[218] <= 8'd145;		input_list[219] <= 8'd111;		input_list[220] <= 8'd91;		input_list[221] <= 8'd68;		input_list[222] <= 8'd62;		input_list[223] <= 8'd98;		input_list[224] <= 8'd156;		input_list[225] <= 8'd144;		input_list[226] <= 8'd147;		input_list[227] <= 8'd93;		input_list[228] <= 8'd97;		input_list[229] <= 8'd105;		input_list[230] <= 8'd61;		input_list[231] <= 8'd82;		input_list[232] <= 8'd155;		input_list[233] <= 8'd139;		input_list[234] <= 8'd149;		input_list[235] <= 8'd76;		input_list[236] <= 8'd101;		input_list[237] <= 8'd140;		input_list[238] <= 8'd59;		input_list[239] <= 8'd74;		input_list[240] <= 8'd148;		input_list[241] <= 8'd135;		input_list[242] <= 8'd147;		input_list[243] <= 8'd71;		input_list[244] <= 8'd114;		input_list[245] <= 8'd158;		input_list[246] <= 8'd79;		input_list[247] <= 8'd66;		input_list[248] <= 8'd135;		input_list[249] <= 8'd120;		input_list[250] <= 8'd133;		input_list[251] <= 8'd92;		input_list[252] <= 8'd133;		input_list[253] <= 8'd176;		input_list[254] <= 8'd103;		input_list[255] <= 8'd60;		//