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vhdl经典源代码——键盘接口设计

<td align="center" width="10%">MC10</td>
<td align="center" width="10%">STD</td>
<td align="center" width="10%">31</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('cnt_scan7_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;7&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_11_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_1</a>聽<a href="Javascript:showPT('FB1_11_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">11_2</a>聽<a href="Javascript:showPT('FB1_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%">24</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('cnt_scan6_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;6&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_12_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_1</a>聽<a href="Javascript:showPT('FB1_12_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">12_2</a>聽<a href="Javascript:showPT('FB1_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%">26</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('cnt_scan15_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;15&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_13_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_1</a>聽<a href="Javascript:showPT('FB1_13_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">13_2</a>聽<a href="Javascript:showPT('FB1_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('cnt_scan14_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;14&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_14_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_1</a>聽<a href="Javascript:showPT('FB1_14_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">14_2</a>聽<a href="Javascript:showPT('FB1_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%">27</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('cnt_scan13_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;13&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_15_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_1</a>聽<a href="Javascript:showPT('FB1_15_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">15_2</a>聽<a href="Javascript:showPT('FB1_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%">28</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('cnt_scan12_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;12&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_16_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_1</a>聽<a href="Javascript:showPT('FB1_16_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">16_2</a>聽<a href="Javascript:showPT('FB1_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%">35</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('cnt_scan11_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;11&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_17_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_1</a>聽<a href="Javascript:showPT('FB1_17_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">17_2</a>聽<a href="Javascript:showPT('FB1_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%">30</td>
<td width="8%" align="center">I/O/GCK1</td>
<td align="center" width="10%">(b)</td>
</tr>
<tr>
<td align="center" width="10%"><a href="Javascript:showEqn('cnt_scan10_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;10&gt;</a></td>
<td align="center" width="10%">3</td>
<td align="center" width="30%">聽<a href="Javascript:showPT('FB1_18_1')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_1</a>聽<a href="Javascript:showPT('FB1_18_2')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_2</a>聽<a href="Javascript:showPT('FB1_18_3')" onmouseover="window.status='show Pterm'; return true;" onmouseout="window.status=''">18_3</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>clk</li>
<li><a href="Javascript:showEqn('cnt_scan0_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;0&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan10_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;10&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan11_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;11&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan12_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;12&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan13_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;13&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan14_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;14&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan1_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;1&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan2_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;2&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan3_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;3&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan4_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;4&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan5_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;5&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan6_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;6&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan7_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;7&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan8_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;8&gt;</a></li>
<li><a href="Javascript:showEqn('cnt_scan9_SPECSIG')" onmouseover="window.status='show Equation'; return true;" onmouseout="window.status=''">cnt_scan&lt;9&gt;</a></li>
<li>rst</li>
</ol></span><form><span class="pgRef"><table width="90%" align="center"><tr>
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