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vhdl经典源代码——时钟设计

<td align="center" width="10%">48</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_7')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_7</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_11_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_1</a>聽<a href="Javascript:showPT('FB3_11_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_2</a>聽<a href="Javascript:showPT('FB3_11_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_3</a>
</td>
<td align="center" width="10%">MC11</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">43</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_242_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_24&lt;2&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_12_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_1</a>聽<a href="Javascript:showPT('FB3_12_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_2</a>聽<a href="Javascript:showPT('FB3_12_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_3</a>
</td>
<td align="center" width="10%">MC12</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">45</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_3cnt2_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_3/cnt&lt;2&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_13_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_1</a>聽<a href="Javascript:showPT('FB3_13_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_2</a>聽<a href="Javascript:showPT('FB3_13_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_3</a>
</td>
<td align="center" width="10%">MC13</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>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXI_3cnt1_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_3/cnt&lt;1&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_14_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_1</a>聽<a href="Javascript:showPT('FB3_14_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_2</a>聽<a href="Javascript:showPT('FB3_14_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_3</a>
</td>
<td align="center" width="10%">MC14</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">49</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_1cnt2_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;2&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_15_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_1</a>聽<a href="Javascript:showPT('FB3_15_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_2</a>聽<a href="Javascript:showPT('FB3_15_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_3</a>
</td>
<td align="center" width="10%">MC15</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">50</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_1cnt1_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_1/cnt&lt;1&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_16_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_1</a>聽<a href="Javascript:showPT('FB3_16_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_2</a>聽<a href="Javascript:showPT('FB3_16_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_3</a>
</td>
<td align="center" width="10%">MC16</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>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('XLXN_292_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_29&lt;2&gt;</a></td>
<td align="center" width="10%">5</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_17_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_1</a>聽<a href="Javascript:showPT('FB3_17_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_2</a>聽<a href="Javascript:showPT('FB3_17_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_3</a>聽<a href="Javascript:showPT('FB3_17_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_4</a>聽<a href="Javascript:showPT('FB3_17_5')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_5</a>
</td>
<td align="center" width="10%">MC17</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">51</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_291_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_29&lt;1&gt;</a></td>
<td align="center" width="10%">5</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB3_18_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_1</a>聽<a href="Javascript:showPT('FB3_18_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_2</a>聽<a href="Javascript:showPT('FB3_18_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_3</a>聽<a href="Javascript:showPT('FB3_18_4')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_4</a>聽<a href="Javascript:showPT('FB3_18_5')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_5</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_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_3cnt0_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_3/cnt&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('XLXI_3cnt1_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXI_3/cnt&lt;1&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_240_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_24&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_241_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_24&lt;1&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_290_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_29&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_291_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_29&lt;1&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_292_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_29&lt;2&gt;</a></li>
<li><a href="Javascript:showEqn('XLXN_293_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_29&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><a href="Javascript:showEqn('XLXN_9')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">XLXN_9</a></li>
<li>clk</li>
<li>rst</li>
</ol></span><form><span class="pgRef"><table width="90%" align="center"><tr>
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                  聽聽
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