微指令格式.htm

浙江大学计算机学院计算机组成教材《计算机组成与设计》（潘学增）的课堂教学课件。

    Extend</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Use output of the sign      
      extension unit as the second ALU input</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    Extshft</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Use the output of the shift by      
      2 unit as the second ALU input</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    rt</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Register rt is the second ALU      
      input</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" rowspan="2" align="center" height="50"><h3><b><font color="#000000" size="4">&nbsp;      
    ALU destination</font></b></h3>      
      
           
     
    </td>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
Target</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">ALU output is written into the      
      register Target&nbsp;</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    rd</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">ALU output is written into      
      register rd</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" rowspan="3" align="center" height="78"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    Memory</font></b></h3>     
     
          
    
    </td>    
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
Read Pc</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Read memory using the PC as      
      address</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    Read ALU</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Read memory using the ALU      
      output as address</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
    Write&nbsp; ALU</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Write memory using the ALU      
      output as address</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" rowspan="3" align="center" height="78"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    Memory register</font></b></h3>      
      
           
     
    </td>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
IR</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Data read form memory is      
      written into the instruction register</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
    Write rt</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Data read from memory is      
      written into register rt</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
    Read&nbsp; rt</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Data written into memory comes      
      from register rt</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" rowspan="3" align="center" height="78"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;      
    PCWrite control</font></b></h3>      
      
           
     
    </td>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
ALU</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Write the output of the ALU      
      into the PC</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
    Target-cond</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">if the Zero output of the ALU      
      is active write the PC with the contents of the register Target&nbsp;</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;&nbsp;      
    jump address</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Write the PC with the jump      
      address from the instruction</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" rowspan="3" align="center" height="86"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;      
    Sequencing</font></b></h3>     
     
          
    
    </td>    
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;&nbsp;      
Seq</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">choose the next      
      microinstruction sequentially</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="30"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;&nbsp;      
    Fetch</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="30"><b><font color="#000000" size="4">Go to the first      
      microinstruction to begin a new instruction&nbsp;</font></b>     
           
    </td>     
  </tr>     
  <tr>     
    <td width="33%" align="center" height="22"><h3><b><font color="#000000" size="4">&nbsp;&nbsp;&nbsp;&nbsp;      
    Dispatch</font></b></h3>     
     
          
    
    </td>    
    <td width="34%" align="center" height="22"><b><font color="#000000" size="4">Dispatch using the ROM      
      specified by i (1 or 2)</font> </b>     
           
    </td>     
  </tr>     
</table>     
     
    
    
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