ch7.htm

汤子瀛《操作系统》电子教案

      </o:p> 
      </font></span></p>
      <p><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font color="#FFFFFF">7．1．3  
      设备控制器<o:p>
      </o:p> 
      </font></span></p>
      <p><font color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman">一、设备控制器的功能</span><span lang="EN-US" style="mso-fareast-font-family: 黑体"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l27 level1 lfo35"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">接收和识别命令</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l27 level1 lfo35"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">2．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">数据交换</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l27 level1 lfo35"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">3．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">设备状态的了解和报告</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 24pt; TEXT-INDENT: -24pt; tab-stops: list 24.0pt; mso-list: l24 level1 lfo34"><font color="#FFFFFF"><span lang="EN-US" style="mso-ascii-font-family: Times New Roman">二、</span><span style="mso-ascii-font-family: Times New Roman">设备控制器的组成</span><span lang="EN-US" style="mso-fareast-font-family: 黑体"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l23 level1 lfo36"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">设备控制器与处理机的接口</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l23 level1 lfo36"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">2．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">设备控制器与设备的接口</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l23 level1 lfo36"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">3．I/O</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">逻辑</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font color="#FFFFFF">&nbsp;<o:p>
      </o:p> 
      </font></span></p>
      <p><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font color="#FFFFFF">7．1．4  
      I/O通道<o:p>
      </o:p> 
      </font></span></p>
      <p><font color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman">一、通道设备的引入</span><span lang="EN-US" style="mso-fareast-font-family: 黑体"><o:p>
      </o:p>
      </span></font></p>
      <p><font color="#FFFFFF"><span style="mso-ascii-font-family: Times New Roman">二、通道类型</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt; mso-fareast-font-family: 黑体"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l3 level1 lfo38"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">字节多路通道（</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">Byte  
      Multiplexor Channal</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">）</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p> 
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l3 level1 lfo38"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">2．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">数组选择通道（</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">Block  
      Selector Channal</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">）</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p> 
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 15.75pt; TEXT-INDENT: -15.75pt; tab-stops: list 15.75pt; mso-list: l3 level1 lfo38"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">3．</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">数组多路通道</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p><span style="mso-ascii-font-family: Times New Roman"><font color="#FFFFFF">三、“瓶颈”问题</font></span></p>
      <p><span lang="EN-US" style="mso-fareast-font-family: 黑体"><font color="#FFFFFF"><o:p>
      </o:p>
      </font></span></td>
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    </center>
    <p style="TEXT-ALIGN: center" align="center"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font color="#FFFFFF"><a name="ch72"></a>7．2<span style="mso-spacerun: yes">&nbsp; 
    </span>I/O控制方式<o:p>
    </o:p> 
    </font></span></p>
    <p><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">（学生自行阅读，着重介绍通道方式）</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    <p style="MARGIN-LEFT: 24pt; TEXT-INDENT: -24pt; tab-stops: list 24.0pt; mso-list: l11 level1 lfo24"><font color="#FFFFFF"><span lang="EN-US">一、</span>程序<span lang="EN-US">I/O方式<o:p>
    </o:p> 
    </span></font></p>
    <p style="MARGIN-LEFT: 24pt; TEXT-INDENT: -24pt; tab-stops: list 24.0pt; mso-list: l11 level1 lfo24"><font color="#FFFFFF"><span lang="EN-US">二、</span>中断驱动<span lang="EN-US">I/O控制方式<o:p>
    </o:p> 
    </span></font></p>
    <p style="MARGIN-LEFT: 24pt; TEXT-INDENT: -24pt; tab-stops: list 24.0pt; mso-list: l11 level1 lfo24"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">三、<span style="font-style: normal; font-variant: normal; font-weight: normal">&nbsp; 
    </span></span>直接存储器访问<span lang="EN-US">DMA控制方式</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; tab-stops: list 18.0pt; mso-list: l30 level1 lfo25"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1．<span style="font-style: normal; font-variant: normal; font-weight: normal">&nbsp; 
    </span>DMA</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">控制方式的引入</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; tab-stops: list 18.0pt; mso-list: l30 level1 lfo25"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">2．<span style="font-style: normal; font-variant: normal; font-weight: normal">&nbsp; 
    </span>DMA</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">控制器的组成</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    <p><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">命令</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">/</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">状态寄存器</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">CR</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">、内存地址寄存器</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">MAR</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">、数据寄存器</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">DR</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">、数据计数器</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">DC<o:p>
    </o:p> 
    </span></font></p>
    <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; tab-stops: list 18.0pt; mso-list: l30 level1 lfo25"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">3．<span style="font-style: normal; font-variant: normal; font-weight: normal">&nbsp; 
    </span>DMA</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">工作过程</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    <p style="MARGIN-LEFT: 24pt; TEXT-INDENT: -24pt; tab-stops: list 24.0pt; mso-list: l11 level1 lfo24"><span lang="EN-US"><font color="#FFFFFF">四、I/O通道控制方式<o:p>
    </o:p> 
    </font></span></p>
    <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; tab-stops: list 18.0pt; mso-list: l34 level1 lfo26"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">1．<span style="font-style: normal; font-variant: normal; font-weight: normal">&nbsp; 
    </span>I/O</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">通道控制方式的引入</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; tab-stops: list 18.0pt; mso-list: l34 level1 lfo26"><font color="#FFFFFF"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">2．<span style="font-style: normal; font-variant: normal; font-weight: normal">&nbsp;  
    </span></span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">通道程序</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
    </o:p>
    </span></font></p>
    　</td>
  </tr>
  <tr>
    <td width="100%" align="left" height="53" colspan="2">
      <p style="TEXT-ALIGN: center" align="center"><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><font color="#FFFFFF"><a name="ch73"></a>7．3<span style="mso-spacerun: yes">&nbsp; 
      </span>缓冲管理<o:p>
      </o:p> 
      </font></span></p>
      <p style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; tab-stops: list 18.0pt; mso-list: l12 level1 lfo21"><font color="#FFFFFF"><span lang="EN-US" style="mso-fareast-font-family: 黑体">1．</span><span style="mso-ascii-font-family: Times New Roman">缓冲的引入</span><span lang="EN-US" style="mso-fareast-font-family: 黑体"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">缓和</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">CPU</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">和</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">I/O</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">设备速度不匹配的矛盾；</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>
      <p style="MARGIN-LEFT: 18pt"><font color="#FFFFFF"><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">减少对</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt">CPU</span><span style="mso-bidi-font-size: 10.0pt; mso-ascii-font-family: Times New Roman; mso-hansi-font-family: Times New Roman">的中断频率，放宽对中断响应时间的限制；</span><span lang="EN-US" style="mso-bidi-font-size: 10.0pt"><o:p>
      </o:p>
      </span></font></p>