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📁 关于单片机接口技术的文档
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<title>Simm 72pin memory</title>
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<p align="center"><strong><font size="5" color="#0000FF"><u>SIMM 72线内存条</u></font></strong></p>

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    <td width="100%" align="center" height="26" bgcolor="#FFC8AA"><font color="#000080">[ <a target="_self" href="hardware.htm" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware.htm">返回目录</a> ]</font></td>
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<p><font color="#008080">&nbsp;&nbsp;&nbsp; SIMM 是 Single Inline Memory Module (单列直插) 
的缩写，72 线内存条的外观为：</font></p>

<p><img src="conn_simm72m.gif" tppabs="http://linux.ustc.edu.cn/~xjiang/hardware/images/conn_simm72m.gif" alt="72 PIN SIMM" WIDTH="415" HEIGHT="113"></p>

<table border="0" width="100%" cellspacing="0" cellpadding="0" height="24">
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    <td width="100%" align="center" height="24" bgcolor="#C8C8FF"><font color="#000080">引脚定义</font></td>
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<p>　</p>

<table border="1">
  <tr>
    <th bgcolor="#0000FF"><font color="#FFFF00">Pin</font></th>
    <th bgcolor="#0000FF"><font color="#FFFF00">无校验</font></th>
    <th bgcolor="#0000FF"><font color="#FFFF00">有校验</font></th>
    <th bgcolor="#0000FF"><font color="#FFFF00">Description</font></th>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">VSS</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">VSS</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Ground</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ0</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ0</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 0</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ16</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ16</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 16</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">4</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 1</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">5</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ17</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ17</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 17</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">6</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 2</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">7</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ18</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ18</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 18</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">8</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 3</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">9</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ19</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ19</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 19</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">10</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">VCC</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">VCC</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">+5 VDC</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">11</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Not connected</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">12</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A0</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A0</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 0</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">13</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 1</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">14</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 2</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">15</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 3</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">16</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A4</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A4</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 4</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">17</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A5</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A5</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 5</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">18</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A6</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A6</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 6</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">19</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A10</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A10</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 10</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">20</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ4</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ4</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 4</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">21</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ20</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ20</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 20</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">22</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ5</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ5</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 5</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">23</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ21</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ21</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 21</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">24</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ6</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ6</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 6</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">25</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ22</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ22</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 22</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">26</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ7</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ7</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 7</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">27</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ23</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">DQ23</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Data 23</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">28</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A7</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A7</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 7</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">29</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A11</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A11</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 11</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">30</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">VCC</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">VCC</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">+5 VDC</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">31</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A8</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A8</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 8</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">32</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A9</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">A9</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Address 9</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">33</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/RAS3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/RAS3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Row Address Strobe 3</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">34</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/RAS2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">/RAS2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Row Address Strobe 2</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">35</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">PQ3</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Parity bit 3 (for the 3rd byte, bits 16-23)</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">36</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">PQ1</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Parity bit 1 (for the 1st byte, bits 0-7)</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">37</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">PQ2</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">Parity bit 2 (for the 2nd byte, bits 8-15)</font></td>
  </tr>
  <tr>
    <td bgcolor="#C8C8FF"><font color="#0000FF">38</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">n/c</font></td>
    <td bgcolor="#C8C8FF"><font color="#0000FF">PQ4</font></td>
12

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