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<a href="#Inputs">Inputs</a> &#124;
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<a href="#Outputs">Outputs</a> &#124;
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<a href="#Parameters">Parameters</a>  </div>
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<h1>decoder Module Reference</h1>  </div>
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<p>Decode instruction and addressing mode.
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<a href="#_details">More...</a></p>
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Inheritance diagram for decoder:<!-- endSectionHeader --></div>
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<table class="memberdecls">
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<tr><td colspan="2"><h2><a name="Inputs"></a>
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Inputs</h2></td></tr>
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 <tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a7db4026429033356b3e09b76156b732f">clock</a> &#160;</td><td class="memItemRight" valign="bottom"></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a61ad360b00fb05f8238b9155ae63b5bc">reset_n</a> &#160;</td><td class="memItemRight" valign="bottom"></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#acba610a108d23efc0a53477c5f6fe487">supervisor</a> &#160;</td><td class="memItemRight" valign="bottom"></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a2481d88d697eb028b1793bc0e065dd5b">ir</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">15</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#affc8522c9920699110f7032dab64bc27">ea_type</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">3</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a318d43d68ac195604223dc414cfd101b">ea_mod</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">2</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#aa161728afe84e7329e0d86421e409ae2">ea_reg</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">2</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td colspan="2"><h2><a name="Outputs"></a>
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Outputs</h2></td></tr>
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 <tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a4daf41bbf4e06065e37da099d5014329">decoder_trap</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">7</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a133650e1b7b2f1084252e478c730c765">decoder_micropc</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">8</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a9128cc8efb53fc283f5db10720c438c5">save_ea</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">8</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a99acf244e2d2303bbf8527208f2b9aae">perform_ea_write</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">8</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a822038e6d6dd1b310c1baec5a27fae42">perform_ea_read</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">8</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a7d7d7dc54d17332e1a61874468a234e4">load_ea</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">8</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  </td></tr>
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<tr><td colspan="2"><h2><a name="Parameters"></a>
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Parameters</h2></td></tr>
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 <tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a7bdf622d023afb9d2d9d0f5f8da30bd9">NO_TRAP</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">7</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  <b><span class="vhdldigit">8'd0</span><span class="vhdlchar"> </span></b></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a778fa3bb31d1ce0a09a2eadb5000de75">ILLEGAL_INSTRUCTION_TRAP</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdldigit">8'd4</span><span class="vhdlchar"> </span></b></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#ae84ffc21c866a5c88730ffbccf673b88">PRIVILEGE_VIOLATION_TRAP</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdldigit">8'd8</span><span class="vhdlchar"> </span></b></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a71b5f423d488d7a396b33639f491e82f">ILLEGAL_1010_INSTRUCTION_TRAP</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdldigit">8'd10</span><span class="vhdlchar"> </span></b></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#a61f8ffa593bc747682ea4086347e70a2">ILLEGAL_1111_INSTRUCTION_TRAP</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdldigit">8'd11</span><span class="vhdlchar"> </span></b></td></tr>
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<tr><td class="memItemLeft" align="right" valign="top"><a class="el" href="classdecoder.html#ad9acccd9eb1fd9f67e06311052efe75a">UNUSED_MICROPC</a> &#160;</td><td class="memItemRight" valign="bottom"><b><span class="vhdlchar">[</span><span class="vhdldigit">8</span><span class="vhdlchar">:</span><span class="vhdldigit">0</span><span class="vhdlchar">]</span><span class="vhdlchar"> </span></b>  <b><span class="vhdldigit">9'd0</span><span class="vhdlchar"> </span></b></td></tr>
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</table>
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<hr/><a name="_details"></a><h2>Detailed Description</h2>
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<p>Decode instruction and addressing mode. </p>
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<p>The decoder is an instruction and addressing mode decoder. For instructions it takes as input the ir register from the registers module. The output of the decoder, in this case, is a microcode address of the first microcode word that performs the instruction.</p>
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<p>In case of addressing mode decoding, the output is the address of the first microcode word that performs the operand loading or saving. This address is obtained from the currently selected addressing mode saved in the ea_mod and ea_type registers in the registers module. </p>
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<hr/><h2>Member Data Documentation</h2>
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<a class="anchor" id="a7db4026429033356b3e09b76156b732f"></a><!-- doxytag: member="decoder::clock" ref="a7db4026429033356b3e09b76156b732f" args="" -->
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          <td class="memname"><span class="stringliteral"><a class="el" href="classdecoder.html#a7db4026429033356b3e09b76156b732f">clock</a></span> <b><span class="vhdlchar"> </span></b> <b><span class="vhdlchar"> </span></b> <code> [Input]</code></td>
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02148">2148</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02150">2150</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02153">2153</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02153">2153</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02153">2153</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02153">2153</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<a class="anchor" id="ad9acccd9eb1fd9f67e06311052efe75a"></a><!-- doxytag: member="decoder::UNUSED_MICROPC" ref="ad9acccd9eb1fd9f67e06311052efe75a" args="9'd0" -->
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<p>Definition at line <a class="el" href="ao68000_8v_source.html#l02160">2160</a> of file <a class="el" href="ao68000_8v_source.html">ao68000.v</a>.</p>
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<hr/>The documentation for this class was generated from the following file:<ul>
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<li><a class="el" href="ao68000_8v_source.html">ao68000.v</a></li>
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<hr class="footer"/><address class="footer"><small>Generated on Sat Dec 11 2010 13:21:13 for ao68000 by&#160;
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<a href="http://www.doxygen.org/index.html">
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.7.2 </small></address>
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