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<a href="divisor_8vhd.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001
<a name="l00006"></a>00006 <span class="vhdlkeyword">library </span><span class="keywordflow">IEEE</span>;
<a name="l00007"></a>00007 <span class="vhdlkeyword">use </span>IEEE.STD_LOGIC_1164.<span class="vhdlkeyword">ALL</span>;
<a name="l00008"></a>00008 <span class="vhdlkeyword">use </span>IEEE.std_logic_arith.<span class="vhdlkeyword">all</span>;
<a name="l00009"></a>00009
<a name="l00011"></a><a class="code" href="classdivisor.html#ac442dca664056131bdaf5c92e4351e01">00011</a> <span class="vhdlkeyword">use </span>work.pkgDefinitions.<span class="vhdlkeyword">all</span>;
<a name="l00012"></a>00012
<a name="l00013"></a><a class="code" href="classdivisor.html">00013</a> <span class="keywordflow">entity </span><a class="code" href="classdivisor.html">divisor</a> <span class="vhdlkeyword">is</span>
<a name="l00014"></a><a class="code" href="classdivisor.html#a0ddd7f10f240eabbaa5f593dc724676d">00014</a> <span class="vhdlkeyword">Port</span> <span class="vhdlchar">(</span> <span class="vhdlchar"><a class="code" href="classdivisor.html#a0ddd7f10f240eabbaa5f593dc724676d" title="Reset input.">rst</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
<a name="l00015"></a><a class="code" href="classdivisor.html#afccc0679a700cd9acf53b87c41fee67a">00015</a> <span class="vhdlchar"><a class="code" href="classdivisor.html#afccc0679a700cd9acf53b87c41fee67a" title="Clock input.">clk</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC</span>;
<a name="l00016"></a><a class="code" href="classdivisor.html#a72b864bee7e5df9aaa6663e15717ee2a">00016</a> <span class="vhdlchar"><a class="code" href="classdivisor.html#a72b864bee7e5df9aaa6663e15717ee2a" title="Division result (32 bits)">quotient</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</span> <span class="comment">STD_LOGIC_VECTOR</span> <span class="vhdlchar">(</span><span class="vhdlchar">(</span><span class="vhdlchar">nBitsLarge</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00017"></a><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa">00017</a> <span class="vhdlchar"><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa" title="Reminder result (32 bits)">reminder</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</span> <span class="comment">STD_LOGIC_VECTOR</span> <span class="vhdlchar">(</span><span class="vhdlchar">(</span><span class="vhdlchar">nBitsLarge</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00018"></a><a class="code" href="classdivisor.html#ad29d3fb6c6ea697db492c43d4a3630eb">00018</a> <span class="vhdlchar"><a class="code" href="classdivisor.html#ad29d3fb6c6ea697db492c43d4a3630eb" title="Numerator (32 bits)">numerator</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC_VECTOR</span> <span class="vhdlchar">(</span><span class="vhdlchar">(</span><span class="vhdlchar">nBitsLarge</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00019"></a><a class="code" href="classdivisor.html#a125151d21c7a62bc99907ddc72a7ebb1">00019</a> <span class="vhdlchar"><a class="code" href="classdivisor.html#a125151d21c7a62bc99907ddc72a7ebb1" title=""Divide by" number (32 bits)">divident</a></span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">in</span> <span class="comment">STD_LOGIC_VECTOR</span> <span class="vhdlchar">(</span><span class="vhdlchar">(</span><span class="vhdlchar">nBitsLarge</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00020"></a>00020 <span class="vhdlchar">done</span> <span class="vhdlchar">:</span> <span class="vhdlkeyword">out</span> <span class="comment">STD_LOGIC</span><span class="vhdlchar">)</span>;
<a name="l00021"></a>00021 <span class="vhdlkeyword">end</span> <span class="vhdlchar">divisor</span>;
<a name="l00022"></a>00022
<a name="l00025"></a><a class="code" href="classdivisor_1_1_behavioral.html">00025</a> <span class="vhdlkeyword">architecture</span> Behavioral <span class="vhdlkeyword">of</span> <a class="code" href="classdivisor.html">divisor</a> is
<a name="l00026"></a>00026
<a name="l00027"></a>00027 <span class="vhdlkeyword">begin</span>
<a name="l00028"></a>00028 <span class="keyword"></span>
<a name="l00029"></a>00029 <span class="keyword"> -- Division algorithm Q=N/D</span>
<a name="l00030"></a>00030 <span class="vhdlkeyword">process</span> (<a class="code" href="classdivisor.html#a0ddd7f10f240eabbaa5f593dc724676d" title="Reset input.">rst</a>, <a class="code" href="classdivisor.html#afccc0679a700cd9acf53b87c41fee67a" title="Clock input.">clk</a>, <a class="code" href="classdivisor.html#ad29d3fb6c6ea697db492c43d4a3630eb" title="Numerator (32 bits)">numerator</a>, <a class="code" href="classdivisor.html#a125151d21c7a62bc99907ddc72a7ebb1" title=""Divide by" number (32 bits)">divident</a>)
<a name="l00031"></a>00031 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">Q</span> <span class="vhdlchar">:</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a72b864bee7e5df9aaa6663e15717ee2a" title="Division result (32 bits)">quotient</a></span><span class="vhdlchar">'</span><span class="vhdlchar">length</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00032"></a>00032 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">R</span> <span class="vhdlchar">:</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa" title="Reminder result (32 bits)">reminder</a></span><span class="vhdlchar">'</span><span class="vhdlchar">length</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00033"></a>00033 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">D</span> <span class="vhdlchar">:</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa" title="Reminder result (32 bits)">reminder</a></span><span class="vhdlchar">'</span><span class="vhdlchar">length</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00034"></a>00034 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">N</span> <span class="vhdlchar">:</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa" title="Reminder result (32 bits)">reminder</a></span><span class="vhdlchar">'</span><span class="vhdlchar">length</span><span class="vhdlchar">-</span><span class="vhdllogic"></span><span class="vhdllogic">1</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span>;
<a name="l00035"></a>00035 <span class="vhdlkeyword">variable</span> <span class="vhdlchar">iteractions</span> <span class="vhdlchar">:</span> <span class="comment">integer</span>;
<a name="l00036"></a>00036 <span class="vhdlkeyword"> begin</span>
<a name="l00037"></a>00037 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a0ddd7f10f240eabbaa5f593dc724676d" title="Reset input.">rst</a></span> <span class="vhdlchar">=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
<a name="l00038"></a>00038 <span class="vhdlchar"><a class="code" href="classdivisor.html#a72b864bee7e5df9aaa6663e15717ee2a" title="Division result (32 bits)">quotient</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">(</span><span class="vhdlkeyword">others</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span>;
<a name="l00039"></a>00039 <span class="vhdlchar"><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa" title="Reminder result (32 bits)">reminder</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">(</span><span class="vhdlkeyword">others</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span>;
<a name="l00040"></a>00040 <span class="vhdlchar">done</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span>;
<a name="l00041"></a>00041 <span class="keyword"></span>
<a name="l00042"></a>00042 <span class="keyword"> -- Initialize variables</span>
<a name="l00043"></a>00043 <span class="vhdlchar">iteractions</span> <span class="vhdlchar">:=</span> <span class="vhdlchar"><a class="code" href="classdivisor.html#a72b864bee7e5df9aaa6663e15717ee2a" title="Division result (32 bits)">quotient</a></span><span class="vhdlchar">'</span><span class="vhdlchar">length</span>;
<a name="l00044"></a>00044 <span class="vhdlchar">D</span> <span class="vhdlchar">:=</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a125151d21c7a62bc99907ddc72a7ebb1" title=""Divide by" number (32 bits)">divident</a></span><span class="vhdlchar">)</span>;
<a name="l00045"></a>00045 <span class="vhdlchar">N</span> <span class="vhdlchar">:=</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#ad29d3fb6c6ea697db492c43d4a3630eb" title="Numerator (32 bits)">numerator</a></span><span class="vhdlchar">)</span>;<span class="keyword"></span>
<a name="l00046"></a>00046 <span class="keyword"> -- initialize quotient <span class="vhdlkeyword">and</span> remainder <span class="vhdlkeyword">to</span> zero</span>
<a name="l00047"></a>00047 <span class="vhdlchar">Q</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">(</span><span class="vhdlkeyword">others</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span>;
<a name="l00048"></a>00048 <span class="vhdlchar">R</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">(</span><span class="vhdlkeyword">others</span> <span class="vhdlchar">=</span><span class="vhdlchar">></span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span>;
<a name="l00049"></a>00049 <span class="vhdlkeyword">elsif</span> <span class="vhdlchar">rising_edge</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#afccc0679a700cd9acf53b87c41fee67a" title="Clock input.">clk</a></span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
<a name="l00050"></a>00050 <span class="vhdlkeyword">if</span> <span class="vhdlchar">iteractions</span> <span class="vhdlchar">></span> <span class="vhdllogic"></span><span class="vhdllogic">0</span> <span class="vhdlkeyword">then</span>
<a name="l00051"></a>00051 <span class="vhdlchar">iteractions</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">iteractions</span> <span class="vhdlchar">-</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span>;<span class="keyword"></span>
<a name="l00052"></a>00052 <span class="keyword"> -- left-shift R by </span><span class="vhdllogic">1</span> <span class="comment">bit</span>
<a name="l00053"></a>00053 <span class="vhdlchar">R</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">(</span><span class="vhdlchar">R</span><span class="vhdlchar">(</span><span class="vhdlchar">(</span><span class="vhdlchar">R</span><span class="vhdlchar">'</span><span class="vhdlchar">HIGH</span> <span class="vhdlchar">-</span> <span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">downto</span> <span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span> <span class="vhdlchar">&</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">'</span><span class="vhdlchar">)</span>;
<a name="l00054"></a>00054 <span class="keyword"></span>
<a name="l00055"></a>00055 <span class="keyword"> --set the least-significant <span class="comment">bit</span> <span class="vhdlkeyword">of</span> R equal <span class="vhdlkeyword">to</span> <span class="comment">bit</span> i <span class="vhdlkeyword">of</span> the numerator(dividend)</span>
<a name="l00056"></a>00056 <span class="vhdlchar">R</span><span class="vhdlchar">(</span><span class="vhdllogic"></span><span class="vhdllogic">0</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">N</span><span class="vhdlchar">(</span><span class="vhdlchar">iteractions</span><span class="vhdlchar">)</span>;
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="vhdlkeyword">if</span> <span class="vhdlchar">(</span><span class="vhdlchar">R</span> <span class="vhdlchar">>=</span> <span class="vhdlchar">D</span><span class="vhdlchar">)</span> <span class="vhdlkeyword">then</span>
<a name="l00059"></a>00059 <span class="vhdlchar">R</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">R</span> <span class="vhdlchar">-</span> <span class="vhdlchar">D</span>;
<a name="l00060"></a>00060 <span class="vhdlchar">Q</span><span class="vhdlchar">(</span><span class="vhdlchar">iteractions</span><span class="vhdlchar">)</span> <span class="vhdlchar">:=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00061"></a>00061 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
<a name="l00062"></a>00062 <span class="vhdlkeyword">else</span><span class="keyword"></span>
<a name="l00063"></a>00063 <span class="keyword"> -- We have the results here...</span>
<a name="l00064"></a>00064 <span class="vhdlchar">done</span> <span class="vhdlchar"><=</span> <span class="vhdlchar">'</span><span class="vhdllogic"></span><span class="vhdllogic">1</span><span class="vhdlchar">'</span>;
<a name="l00065"></a>00065 <span class="vhdlchar"><a class="code" href="classdivisor.html#a72b864bee7e5df9aaa6663e15717ee2a" title="Division result (32 bits)">quotient</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">CONV_STD_LOGIC_VECTOR</span><span class="vhdlchar">(</span><span class="vhdlchar">Q</span><span class="vhdlchar">,</span><span class="vhdllogic"></span><span class="vhdllogic">32</span><span class="vhdlchar">)</span>;
<a name="l00066"></a>00066 <span class="vhdlchar"><a class="code" href="classdivisor.html#a2e2b27233f56bb5217044913043942fa" title="Reminder result (32 bits)">reminder</a></span> <span class="vhdlchar"><=</span> <span class="vhdlchar">CONV_STD_LOGIC_VECTOR</span><span class="vhdlchar">(</span><span class="vhdlchar">R</span><span class="vhdlchar">,</span><span class="vhdllogic"></span><span class="vhdllogic">32</span><span class="vhdlchar">)</span>;
<a name="l00067"></a>00067 <span class="keyword"></span>
<a name="l00068"></a>00068 <span class="keyword"> -- Used <span class="vhdlkeyword">to</span> avoid transparent latch (Good practise)</span>
<a name="l00069"></a>00069 <span class="vhdlchar">D</span> <span class="vhdlchar">:=</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#a125151d21c7a62bc99907ddc72a7ebb1" title=""Divide by" number (32 bits)">divident</a></span><span class="vhdlchar">)</span>;
<a name="l00070"></a>00070 <span class="vhdlchar">N</span> <span class="vhdlchar">:=</span> <span class="comment">unsigned</span><span class="vhdlchar">(</span><span class="vhdlchar"><a class="code" href="classdivisor.html#ad29d3fb6c6ea697db492c43d4a3630eb" title="Numerator (32 bits)">numerator</a></span><span class="vhdlchar">)</span>;
<a name="l00071"></a>00071 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
<a name="l00072"></a>00072 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">if</span>;
<a name="l00073"></a>00073 <span class="vhdlkeyword">end</span> <span class="vhdlkeyword">process</span>;
<a name="l00074"></a>00074
<a name="l00075"></a>00075 <span class="vhdlkeyword">end</span> <span class="vhdlchar">Behavioral</span>;
<a name="l00076"></a>00076
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