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81 lines
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<title>VLSI SAPD Documentation</title>
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<h1 id="pagetop" class="header">VLSI SAPD Documentation</h1>
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<center class="header">
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<table class="header">
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<tr>
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<td><a href="index.html">Presentation</a></td>
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<td><a href="agds.html">AGDS</a></td>
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<td><a href="cif.html">CIF</a></td>
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<td><a href="dtr.html">DTR</a></td>
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<td><a href="openchams.html">OPENCHAMS</a></td>
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<!-- Generated by Doxygen 1.8.14 -->
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</div><!-- top -->
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<div class="header">
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<div class="headertitle">
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<div class="title">CIF Format </div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><h1><a class="anchor" id="cifPres"></a>
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Presentation</h1>
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<p>The <b>Caltech Intermediate Format (CIF)</b> consists in a limited set of graphic primitives used to describe the shapes on each layer of an integrated circuit (see <a href="http://en.wikipedia.org/wiki/Caltech_Intermediate_Form">http://en.wikipedia.org/wiki/Caltech_Intermediate_Form</a> for more informations). <br />
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</p>
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<h2><a class="anchor" id="cifAutrhos"></a>
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Author</h2>
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<p>Damien Dupuis: damien.dupuis(at)lip6(.)fr</p>
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<h2><a class="anchor" id="cifLimits"></a>
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Limitations</h2>
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<p>Although the CIF format allows hierarchical description and supports several shapes, in this driver, we do not use hierarchy and only use Polygons.</p>
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<h1><a class="anchor" id="cifDB"></a>
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Stand alone database structure</h1>
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<p>The database consists in two simple objects :</p><ul>
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<li><a class="el" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a> contains all CIF circuit informations such as the name, the unit used, the scale and the list of all Polygons.</li>
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<li><a class="el" href="class_c_i_f_1_1_polygon.html">CIF::Polygon</a> describes a Polygon (a set of points).</li>
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</ul>
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<h2><a class="anchor" id="cifDriver"></a>
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Using the driver</h2>
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<p>To drive a CIF file, user has to create one <a class="el" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a> and as many <a class="el" href="class_c_i_f_1_1_polygon.html">CIF::Polygon</a> as the number of shapes of the layout. The <a class="el" href="class_c_i_f_1_1_polygon.html">CIF::Polygon</a> objects can be created independently from for the <a class="el" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a> but must be finally added to the <a class="el" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a> using <a class="el" href="class_c_i_f_1_1_circuit.html#a5b37e86206e2a128ba6db4987dc09a39" title="adds a Polygon to the Circuit. ">CIF::Circuit::addPolygon()</a>.<br />
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Once the <a class="el" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a> is complete, simply call the <a class="el" href="class_c_i_f_1_1_circuit.html#a90c823b70c4984f302c19ceca604d101" title="writes the database to file. ">CIF::Circuit::writeToFile()</a> method to drive the database to file.</p>
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<h1><a class="anchor" id="cifExamples"></a>
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Examples</h1>
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<p>As said is the global presentation, VLSI SAPD project provides C++ libraries and Python modules for each supported format. In this section we present two simple code examples to drive a CIF file using C++ or Python. These two examples drive the same file <code>transistor.cif:</code> </p><div class="fragment"><div class="line">(CIF file written on 11-Jun-2010 13:49:44 by VLSISAPD_CIF_DRIVER);</div><div class="line">(Units: micro - UU/DB Scale: 0.001);</div><div class="line">DS 1 1 1;</div><div class="line">9 Transistor;</div><div class="line">L 6; P 130,290 540,290 540,690 130,690;</div><div class="line">L 17; P 305,150 365,150 365,830 305,830;</div><div class="line">DF;</div><div class="line">C 1;</div><div class="line">E</div></div><!-- fragment --><div class="image">
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<img src="transistorCif.png" alt="transistorCif.png"/>
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<div class="caption">
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CIF example layout</div></div>
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<h2><a class="anchor" id="cifC"></a>
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C++</h2>
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<p>Here is the C++ code (<code>driveCif.cpp</code>) used to generate the transistor.cif file. (Source is available in examples directory). </p><div class="fragment"><div class="line"><span class="preprocessor">#include <string></span></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="preprocessor">#include "vlsisapd/cif/Circuit.h"</span></div><div class="line"><span class="preprocessor">#include "vlsisapd/cif/Polygon.h"</span></div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> * argv[]) {</div><div class="line"> <a class="code" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a>* circuit = <span class="keyword">new</span> <a class="code" href="class_c_i_f_1_1_circuit.html">CIF::Circuit</a>(<span class="keywordtype">string</span>(<span class="stringliteral">"Transistor"</span>), <span class="keywordtype">string</span>(<span class="stringliteral">"micro"</span>), 0.001);</div><div class="line"></div><div class="line"> <span class="comment">// Layer #6 corresponds to active</span></div><div class="line"> <a class="code" href="class_c_i_f_1_1_polygon.html">CIF::Polygon</a>* poly = <span class="keyword">new</span> <a class="code" href="class_c_i_f_1_1_polygon.html">CIF::Polygon</a>(6);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(130, 290);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(540, 290);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(540, 690);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(130, 690);</div><div class="line"> circuit-><a class="code" href="class_c_i_f_1_1_circuit.html#a5b37e86206e2a128ba6db4987dc09a39">addPolygon</a>(poly);</div><div class="line"></div><div class="line"> <span class="comment">// Layer #17 corresponds to polysilicium</span></div><div class="line"> poly = <span class="keyword">new</span> <a class="code" href="class_c_i_f_1_1_polygon.html">CIF::Polygon</a>(17);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(305, 150);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(365, 150);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(365, 830);</div><div class="line"> poly-><a class="code" href="class_c_i_f_1_1_polygon.html#ab3047469780327f18539907e1303ea15">addPoint</a>(305, 830);</div><div class="line"> circuit-><a class="code" href="class_c_i_f_1_1_circuit.html#a5b37e86206e2a128ba6db4987dc09a39">addPolygon</a>(poly);</div><div class="line"></div><div class="line"> circuit-><a class="code" href="class_c_i_f_1_1_circuit.html#a90c823b70c4984f302c19ceca604d101">writeToFile</a>(<span class="stringliteral">"./transistor.cif"</span>);</div><div class="line"> </div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"></div></div><!-- fragment --><dl class="section note"><dt>Note</dt><dd>In order to compile this code, a CMakeLists.txt file is provided. User must set the $VLSISAPD_TOP variable before running these commands in the directory containing the CMakeLists.txt file: <div class="fragment"><div class="line">%> mkdir build; cd build</div><div class="line">%> cmake ..</div><div class="line">%> make</div></div><!-- fragment --></dd></dl>
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<h2><a class="anchor" id="cifPython"></a>
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Python</h2>
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<p>Here is the Python code (<code>driveCif.py</code>) used to generate the transistor.cif file. (Source is available in examples directory). </p><div class="fragment"><div class="line"><span class="keyword">import</span> CIF</div><div class="line">circuit = <a class="code" href="class_c_i_f_1_1_circuit.html">CIF.Circuit</a>(<span class="stringliteral">"Transistor"</span>, <span class="stringliteral">"micro"</span>, 0.001)</div><div class="line">poly1 = <a class="code" href="class_c_i_f_1_1_polygon.html">CIF.Polygon</a>(6)</div><div class="line">poly1.addPoint(130, 290)</div><div class="line">poly1.addPoint(540, 290)</div><div class="line">poly1.addPoint(540, 690)</div><div class="line">poly1.addPoint(130, 690)</div><div class="line">circuit.addPolygon(poly1)</div><div class="line"> </div><div class="line">poly2 = <a class="code" href="class_c_i_f_1_1_polygon.html">CIF.Polygon</a>(17)</div><div class="line">poly2.addPoint(305, 150);</div><div class="line">poly2.addPoint(365, 150);</div><div class="line">poly2.addPoint(365, 830);</div><div class="line">poly2.addPoint(305, 830);</div><div class="line">circuit.addPolygon(poly2)</div><div class="line"></div><div class="line">circuit.writeToFile(<span class="stringliteral">"./transistor.cif"</span>)</div></div><!-- fragment --><dl class="section note"><dt>Note</dt><dd>In order to run the <code>driveCif.py</code> script, user must ensure that $PYTHONPATH variable points to the directory containing CIF.so module. </dd></dl>
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