| 1 |
2 |
rud_dp |
///*************************************************************///
|
| 2 |
|
|
/// ///
|
| 3 |
|
|
/// Reed-Solomon Decoder (31,19,6) ///
|
| 4 |
|
|
/// ///
|
| 5 |
|
|
/// ///
|
| 6 |
|
|
/// Author : Rudy Dwi Putra ///
|
| 7 |
|
|
/// rudy.dp@gmail.com ///
|
| 8 |
|
|
/// ///
|
| 9 |
|
|
///*************************************************************///
|
| 10 |
|
|
/// ///
|
| 11 |
|
|
/// Copyright (C) 2006 Rudy Dwi Putra ///
|
| 12 |
|
|
/// rudy.dp@gmail.com ///
|
| 13 |
|
|
/// ///
|
| 14 |
|
|
/// This source file may be used and distributed without ///
|
| 15 |
|
|
/// restriction provided that this copyright statement is not ///
|
| 16 |
|
|
/// removed from the file and that any derivative work contains ///
|
| 17 |
|
|
/// the original copyright notice and the associated disclaimer.///
|
| 18 |
|
|
/// ///
|
| 19 |
|
|
/// THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY ///
|
| 20 |
|
|
/// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED ///
|
| 21 |
|
|
/// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS ///
|
| 22 |
|
|
/// FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR ///
|
| 23 |
|
|
/// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, ///
|
| 24 |
|
|
/// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ///
|
| 25 |
|
|
/// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE ///
|
| 26 |
|
|
/// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR ///
|
| 27 |
|
|
/// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF ///
|
| 28 |
|
|
/// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ///
|
| 29 |
|
|
/// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT ///
|
| 30 |
|
|
/// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE ///
|
| 31 |
|
|
/// POSSIBILITY OF SUCH DAMAGE. ///
|
| 32 |
|
|
/// ///
|
| 33 |
|
|
///*************************************************************///
|
| 34 |
|
|
|
| 35 |
|
|
//***************************************//
|
| 36 |
|
|
// Testbench for RS Decoder (31, 19, 6) //
|
| 37 |
|
|
//***************************************//
|
| 38 |
|
|
|
| 39 |
|
|
module testbench_rsdecoder;
|
| 40 |
|
|
|
| 41 |
|
|
reg [4:0] recword;
|
| 42 |
|
|
reg clock1, clock2;
|
| 43 |
|
|
reg start, reset;
|
| 44 |
|
|
|
| 45 |
|
|
//******************************************************//
|
| 46 |
|
|
// ready = if set to 1, decoder is ready to input or it //
|
| 47 |
|
|
// is inputting new data //
|
| 48 |
|
|
// dataoutstart = flag the first symbol of outputted //
|
| 49 |
|
|
// received word. //
|
| 50 |
|
|
// dataoutend = flag the last symbol of outputted //
|
| 51 |
|
|
// received word. //
|
| 52 |
|
|
// errfound = set to 1, if one of syndrome values //
|
| 53 |
|
|
// is not zero. //
|
| 54 |
|
|
// decode_fail = set to 1, if decoder fails to correct //
|
| 55 |
|
|
// the received word. //
|
| 56 |
|
|
//******************************************************//
|
| 57 |
|
|
wire ready, decode_fail, errfound, dataoutstart, dataoutend;
|
| 58 |
|
|
wire [4:0] corr_recword;
|
| 59 |
|
|
|
| 60 |
|
|
parameter [5:0] clk_period = 50;
|
| 61 |
|
|
|
| 62 |
|
|
initial
|
| 63 |
|
|
begin
|
| 64 |
|
|
recword = 5'b0;
|
| 65 |
|
|
start = 0;
|
| 66 |
|
|
reset = 0;
|
| 67 |
|
|
end
|
| 68 |
|
|
|
| 69 |
|
|
//**********//
|
| 70 |
|
|
// clock1 //
|
| 71 |
|
|
//**********//
|
| 72 |
|
|
initial
|
| 73 |
|
|
begin
|
| 74 |
|
|
clock1 = 0;
|
| 75 |
|
|
forever #(clk_period/2) clock1 = ~clock1;
|
| 76 |
|
|
end
|
| 77 |
|
|
|
| 78 |
|
|
//**********//
|
| 79 |
|
|
// clock2 //
|
| 80 |
|
|
//**********//
|
| 81 |
|
|
initial
|
| 82 |
|
|
begin
|
| 83 |
|
|
clock2 = 1;
|
| 84 |
|
|
forever #(clk_period/2) clock2 = ~clock2;
|
| 85 |
|
|
end
|
| 86 |
|
|
|
| 87 |
|
|
//***********************************************//
|
| 88 |
|
|
// This section defines feeding of received word //
|
| 89 |
|
|
// and start signal. Start signal is active 1 //
|
| 90 |
|
|
// clock cycle before first symbol of received //
|
| 91 |
|
|
// word. All input and output synchronize with //
|
| 92 |
|
|
// clock2. First received word contains no error //
|
| 93 |
|
|
// symbol. Thus, all syndrome values will be zero//
|
| 94 |
|
|
// and decoder will pass the received word. //
|
| 95 |
|
|
// Second received word contains 6 error symbol. //
|
| 96 |
|
|
// Decoder will determine its error locator //
|
| 97 |
|
|
// and error evaluator polynomial in KES block. //
|
| 98 |
|
|
// Then, it calculates error values in CSEE //
|
| 99 |
|
|
// block. Third received word contains 8 error //
|
| 100 |
|
|
// symbol. Decoder can't correct the error and //
|
| 101 |
|
|
// at the end of outputted received word, it will//
|
| 102 |
|
|
// set decode_fail to 1. //
|
| 103 |
|
|
//***********************************************//
|
| 104 |
|
|
initial
|
| 105 |
|
|
begin
|
| 106 |
|
|
#(clk_period) reset = 1;
|
| 107 |
|
|
|
| 108 |
|
|
//start has to be active 1 clock cycle before first recword,
|
| 109 |
|
|
//otherwise decoder will output wrong recword.
|
| 110 |
|
|
#(clk_period) start = 1;
|
| 111 |
|
|
#(clk_period) start = 0;
|
| 112 |
|
|
|
| 113 |
|
|
//First received word contains no error symbol.
|
| 114 |
|
|
//The decoder should give errfound = 0 at the end
|
| 115 |
|
|
//of syndrome calculation stage.
|
| 116 |
|
|
recword = 5'b10100;
|
| 117 |
|
|
#(clk_period) recword = 5'b00100;
|
| 118 |
|
|
#(clk_period) recword = 5'b00101;
|
| 119 |
|
|
#(clk_period) recword = 5'b10001;
|
| 120 |
|
|
#(clk_period) recword = 5'b10110;
|
| 121 |
|
|
#(clk_period) recword = 5'b00001;
|
| 122 |
|
|
#(clk_period) recword = 5'b00010;
|
| 123 |
|
|
#(clk_period) recword = 5'b11100;
|
| 124 |
|
|
#(clk_period) recword = 5'b00011;
|
| 125 |
|
|
#(clk_period) recword = 5'b10001;
|
| 126 |
|
|
#(clk_period) recword = 5'b00110;
|
| 127 |
|
|
#(clk_period) recword = 5'b00111;
|
| 128 |
|
|
#(clk_period) recword = 5'b01010;
|
| 129 |
|
|
#(clk_period) recword = 5'b11111;
|
| 130 |
|
|
#(clk_period) recword = 5'b01011;
|
| 131 |
|
|
#(clk_period) recword = 5'b10100;
|
| 132 |
|
|
#(clk_period) recword = 5'b00100;
|
| 133 |
|
|
#(clk_period) recword = 5'b00101;
|
| 134 |
|
|
#(clk_period) recword = 5'b00001;
|
| 135 |
|
|
#(clk_period) recword = 5'b10111;
|
| 136 |
|
|
#(clk_period) recword = 5'b10100;
|
| 137 |
|
|
#(clk_period) recword = 5'b00010;
|
| 138 |
|
|
#(clk_period) recword = 5'b10110;
|
| 139 |
|
|
#(clk_period) recword = 5'b00100;
|
| 140 |
|
|
#(clk_period) recword = 5'b01011;
|
| 141 |
|
|
#(clk_period) recword = 5'b00110;
|
| 142 |
|
|
#(clk_period) recword = 5'b11110;
|
| 143 |
|
|
#(clk_period) recword = 5'b10100;
|
| 144 |
|
|
#(clk_period) recword = 5'b11111;
|
| 145 |
|
|
#(clk_period) recword = 5'b01010;
|
| 146 |
|
|
#(clk_period) recword = 5'b11110;
|
| 147 |
|
|
#(clk_period) recword = 5'b0;
|
| 148 |
|
|
|
| 149 |
|
|
|
| 150 |
|
|
#(18*clk_period) start = 1;
|
| 151 |
|
|
#(clk_period) start = 0;
|
| 152 |
|
|
|
| 153 |
|
|
//Second received word contains 6 error symbols.
|
| 154 |
|
|
//The decoder sets errfound = 1, and activates
|
| 155 |
|
|
//KES block and then CSEE block. Because the
|
| 156 |
|
|
//number of errors is equal to correction capability
|
| 157 |
|
|
//of the decoder, decoder can correct the received
|
| 158 |
|
|
//word.
|
| 159 |
|
|
recword = 5'b01100; //it should be 5'b10100
|
| 160 |
|
|
#(clk_period) recword = 5'b00100;
|
| 161 |
|
|
#(clk_period) recword = 5'b00101;
|
| 162 |
|
|
#(clk_period) recword = 5'b10001;
|
| 163 |
|
|
#(clk_period) recword = 5'b10110;
|
| 164 |
|
|
#(clk_period) recword = 5'b00001;
|
| 165 |
|
|
#(clk_period) recword = 5'b00110; //it should be 5'b00010
|
| 166 |
|
|
#(clk_period) recword = 5'b11100;
|
| 167 |
|
|
#(clk_period) recword = 5'b00011;
|
| 168 |
|
|
#(clk_period) recword = 5'b10001;
|
| 169 |
|
|
#(clk_period) recword = 5'b00110;
|
| 170 |
|
|
#(clk_period) recword = 5'b00101; //it should be 5'b00111
|
| 171 |
|
|
#(clk_period) recword = 5'b01010;
|
| 172 |
|
|
#(clk_period) recword = 5'b11111;
|
| 173 |
|
|
#(clk_period) recword = 5'b11111; //it should be 5'b01011
|
| 174 |
|
|
#(clk_period) recword = 5'b10100;
|
| 175 |
|
|
#(clk_period) recword = 5'b00100;
|
| 176 |
|
|
#(clk_period) recword = 5'b00101;
|
| 177 |
|
|
#(clk_period) recword = 5'b00001;
|
| 178 |
|
|
#(clk_period) recword = 5'b10111;
|
| 179 |
|
|
#(clk_period) recword = 5'b01101; //it should be 5'b10100
|
| 180 |
|
|
#(clk_period) recword = 5'b00010;
|
| 181 |
|
|
#(clk_period) recword = 5'b10110;
|
| 182 |
|
|
#(clk_period) recword = 5'b00100;
|
| 183 |
|
|
#(clk_period) recword = 5'b01011;
|
| 184 |
|
|
#(clk_period) recword = 5'b00110;
|
| 185 |
|
|
#(clk_period) recword = 5'b11110;
|
| 186 |
|
|
#(clk_period) recword = 5'b10100;
|
| 187 |
|
|
#(clk_period) recword = 5'b10101; //it should be 5'b11111
|
| 188 |
|
|
#(clk_period) recword = 5'b01010;
|
| 189 |
|
|
#(clk_period) recword = 5'b11110;
|
| 190 |
|
|
#(clk_period) recword = 5'b0;
|
| 191 |
|
|
|
| 192 |
|
|
#(20*clk_period) start = 1;
|
| 193 |
|
|
#(clk_period) start = 0;
|
| 194 |
|
|
//Third received word contains 8 error symbols.
|
| 195 |
|
|
//Because the number of errors is greater than correction
|
| 196 |
|
|
//capability, decoder will resume decoding failure at the end of
|
| 197 |
|
|
//outputted received word.
|
| 198 |
|
|
recword = 5'b10100;
|
| 199 |
|
|
#(clk_period) recword = 5'b00100;
|
| 200 |
|
|
#(clk_period) recword = 5'b00101;
|
| 201 |
|
|
#(clk_period) recword = 5'b10001;
|
| 202 |
|
|
#(clk_period) recword = 5'b10110;
|
| 203 |
|
|
#(clk_period) recword = 5'b00100; //it should be 5'b00001
|
| 204 |
|
|
#(clk_period) recword = 5'b00010;
|
| 205 |
|
|
#(clk_period) recword = 5'b11100;
|
| 206 |
|
|
#(clk_period) recword = 5'b10010; //it should be 5'b00011
|
| 207 |
|
|
#(clk_period) recword = 5'b10101; //it should be 5'b10001
|
| 208 |
|
|
#(clk_period) recword = 5'b00110;
|
| 209 |
|
|
#(clk_period) recword = 5'b10011; //it should be 5'b00111
|
| 210 |
|
|
#(clk_period) recword = 5'b01010;
|
| 211 |
|
|
#(clk_period) recword = 5'b11111;
|
| 212 |
|
|
#(clk_period) recword = 5'b01011;
|
| 213 |
|
|
#(clk_period) recword = 5'b10100;
|
| 214 |
|
|
#(clk_period) recword = 5'b00110; //it should be 5'b00100
|
| 215 |
|
|
#(clk_period) recword = 5'b00101;
|
| 216 |
|
|
#(clk_period) recword = 5'b00100; //it should be 5'b00001
|
| 217 |
|
|
#(clk_period) recword = 5'b10110; //it should be 5'b10111
|
| 218 |
|
|
#(clk_period) recword = 5'b10100;
|
| 219 |
|
|
#(clk_period) recword = 5'b00010;
|
| 220 |
|
|
#(clk_period) recword = 5'b10110;
|
| 221 |
|
|
#(clk_period) recword = 5'b00100;
|
| 222 |
|
|
#(clk_period) recword = 5'b01011;
|
| 223 |
|
|
#(clk_period) recword = 5'b00110;
|
| 224 |
|
|
#(clk_period) recword = 5'b11110;
|
| 225 |
|
|
#(clk_period) recword = 5'b10010; //it should be 5'b10100
|
| 226 |
|
|
#(clk_period) recword = 5'b11111;
|
| 227 |
|
|
#(clk_period) recword = 5'b01010;
|
| 228 |
|
|
#(clk_period) recword = 5'b11110;
|
| 229 |
|
|
#(clk_period) recword = 5'b0;
|
| 230 |
|
|
end
|
| 231 |
|
|
|
| 232 |
|
|
|
| 233 |
|
|
RSDecoder rsdecoder(recword, start, clock1, clock2, reset, ready,
|
| 234 |
|
|
errfound, decode_fail, dataoutstart, dataoutend,
|
| 235 |
|
|
corr_recword);
|
| 236 |
|
|
|
| 237 |
|
|
endmodule
|
