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vhdl经典源代码——时钟设计

<td align="center" width="10%">STD</td>
<td align="center" width="10%">101</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_1cnt14_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;14&gt;</a></td>
<td align="center" width="10%">4</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_11_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_1</a>聽<a href="Javascript:showPT('FB8_11_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_2</a>聽<a href="Javascript:showPT('FB8_11_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_3</a>聽<a href="Javascript:showPT('FB8_11_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_4</a>
</td>
<td align="center" width="10%">MC11</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">98</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_1cnt12_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;12&gt;</a></td>
<td align="center" width="10%">4</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_12_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_1</a>聽<a href="Javascript:showPT('FB8_12_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_2</a>聽<a href="Javascript:showPT('FB8_12_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_3</a>聽<a href="Javascript:showPT('FB8_12_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_4</a>
</td>
<td align="center" width="10%">MC12</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">100</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_1cnt11_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;11&gt;</a></td>
<td align="center" width="10%">4</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_13_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_1</a>聽<a href="Javascript:showPT('FB8_13_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_2</a>聽<a href="Javascript:showPT('FB8_13_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_3</a>聽<a href="Javascript:showPT('FB8_13_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_4</a>
</td>
<td align="center" width="10%">MC13</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">103</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_1cnt10_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;10&gt;</a></td>
<td align="center" width="10%">4</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_14_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_1</a>聽<a href="Javascript:showPT('FB8_14_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_2</a>聽<a href="Javascript:showPT('FB8_14_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_3</a>聽<a href="Javascript:showPT('FB8_14_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_4</a>
</td>
<td align="center" width="10%">MC14</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">102</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_1cnt6_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;6&gt;</a></td>
<td align="center" width="10%">9</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_14_5')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_5</a>聽<a href="Javascript:showPT('FB8_15_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_1</a>聽<a href="Javascript:showPT('FB8_15_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_2</a>聽<a href="Javascript:showPT('FB8_15_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_3</a>聽<a href="Javascript:showPT('FB8_15_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_4</a>聽<a href="Javascript:showPT('FB8_15_5')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_5</a>聽<a href="Javascript:showPT('FB8_16_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_3</a>聽<a href="Javascript:showPT('FB8_16_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_4</a>聽<a href="Javascript:showPT('FB8_16_5')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_5</a>
</td>
<td align="center" width="10%">MC15</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">104</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('dataout6_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">dataout&lt;6&gt;</a></td>
<td align="center" width="10%">4</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_16_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_1</a>聽<a href="Javascript:showPT('FB8_16_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_2</a>聽<a href="Javascript:showPT('FB8_17_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_4</a>聽<a href="Javascript:showPT('FB8_17_5')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_5</a>
</td>
<td align="center" width="10%">MC16</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">107</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">O</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_1cnt5_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;5&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_17_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_1</a>聽<a href="Javascript:showPT('FB8_17_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_2</a>聽<a href="Javascript:showPT('FB8_17_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_3</a>
</td>
<td align="center" width="10%">MC17</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">105</td>
<td width="8%" align="center">I/O</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXN_260_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_26&lt;0&gt;</a></td>
<td align="center" width="10%">2</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB8_18_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_1</a>聽<a href="Javascript:showPT('FB8_18_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_2</a>聽<a href="Javascript:showPT('VCC')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''"></a>
</td>
<td align="center" width="10%">MC18</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">聽</td>
<td align="center" width="10%">(b)</td>
<td align="center" width="10%">(b)</td>
</tr>
</table></span></div>
<div id="tipBox"></div>
<br><span id="fbsiguse" class="pgRef"><b>Signals Used By Logic in Function Block</b><br><ol>
<li><a href="Javascript:showEqn('XLXI_1cnt0_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt10_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;10&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt11_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;11&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt12_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;12&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt13_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;13&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt14_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;14&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt1_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;1&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt2_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;2&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt3_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;3&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt4_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;4&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt5_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;5&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt6_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;6&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt7_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;7&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt8_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;8&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_1cnt9_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;9&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_130_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_13&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_131_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_13&lt;1&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_132_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_13&lt;2&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_133_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_13&lt;3&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_260_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_26&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_261_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_26&lt;1&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_262_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_26&lt;2&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_263_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_26&lt;3&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_6')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_6</a></li>
<li>clk</li>
<li>rst</li>
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