\hypertarget{cif_cifPres}{}\section{Presentation}\label{cif_cifPres}
The {\bfseries Caltech Intermediate Format (C\+IF)} consists in a limited set of graphic primitives used to describe the shapes on each layer of an integrated circuit (see \href{http://en.wikipedia.org/wiki/Caltech_Intermediate_Form}{\tt http\+://en.\+wikipedia.\+org/wiki/\+Caltech\+\_\+\+Intermediate\+\_\+\+Form} for more informations). ~\newline
 \hypertarget{cif_cifAutrhos}{}\subsection{Author}\label{cif_cifAutrhos}
Damien Dupuis\+: damien.\+dupuis(at)lip6(.)fr\hypertarget{cif_cifLimits}{}\subsection{Limitations}\label{cif_cifLimits}
Although the C\+IF format allows hierarchical description and supports several shapes, in this driver, we do not use hierarchy and only use Polygons.\hypertarget{cif_cifDB}{}\section{Stand alone database structure}\label{cif_cifDB}
The database consists in two simple objects \+:
\begin{DoxyItemize}
\item \mbox{\hyperlink{class_c_i_f_1_1_circuit}{C\+I\+F\+::\+Circuit}} contains all C\+IF circuit informations such as the name, the unit used, the scale and the list of all Polygons.
\item \mbox{\hyperlink{class_c_i_f_1_1_polygon}{C\+I\+F\+::\+Polygon}} describes a Polygon (a set of points).
\end{DoxyItemize}\hypertarget{cif_cifDriver}{}\subsection{Using the driver}\label{cif_cifDriver}
To drive a C\+IF file, user has to create one \mbox{\hyperlink{class_c_i_f_1_1_circuit}{C\+I\+F\+::\+Circuit}} and as many \mbox{\hyperlink{class_c_i_f_1_1_polygon}{C\+I\+F\+::\+Polygon}} as the number of shapes of the layout. The \mbox{\hyperlink{class_c_i_f_1_1_polygon}{C\+I\+F\+::\+Polygon}} objects can be created independently from for the \mbox{\hyperlink{class_c_i_f_1_1_circuit}{C\+I\+F\+::\+Circuit}} but must be finally added to the \mbox{\hyperlink{class_c_i_f_1_1_circuit}{C\+I\+F\+::\+Circuit}} using \mbox{\hyperlink{class_c_i_f_1_1_circuit_a5b37e86206e2a128ba6db4987dc09a39}{C\+I\+F\+::\+Circuit\+::add\+Polygon()}}.~\newline
Once the \mbox{\hyperlink{class_c_i_f_1_1_circuit}{C\+I\+F\+::\+Circuit}} is complete, simply call the \mbox{\hyperlink{class_c_i_f_1_1_circuit_a90c823b70c4984f302c19ceca604d101}{C\+I\+F\+::\+Circuit\+::write\+To\+File()}} method to drive the database to file.\hypertarget{cif_cifExamples}{}\section{Examples}\label{cif_cifExamples}
As said is the global presentation, V\+L\+SI S\+A\+PD project provides C++ libraries and Python modules for each supported format. In this section we present two simple code examples to drive a C\+IF file using C++ or Python. These two examples drive the same file {\ttfamily transistor.\+cif\+:} 
\begin{DoxyCodeInclude}
(CIF file written on 11-Jun-2010  13:49:44 by VLSISAPD\_CIF\_DRIVER);
(Units: micro  -  UU/DB Scale: 0.001);
DS 1 1 1;
9 Transistor;
L 6; P 130,290 540,290 540,690 130,690;
L 17; P 305,150 365,150 365,830 305,830;
DF;
C 1;
E
\end{DoxyCodeInclude}


 
\begin{DoxyImage}
\includegraphics[width=.25\linewidth]{transistorCif}
\doxyfigcaption{C\+IF example layout }
\end{DoxyImage}
\hypertarget{cif_cifC}{}\subsection{C++}\label{cif_cifC}
Here is the C++ code ({\ttfamily drive\+Cif.\+cpp}) used to generate the transistor.\+cif file. (Source is available in examples directory). 
\begin{DoxyCodeInclude}
\textcolor{preprocessor}{#include <string>}
\textcolor{keyword}{using namespace }\mbox{\hyperlink{namespacestd}{std}};

\textcolor{preprocessor}{#include "vlsisapd/cif/Circuit.h"}
\textcolor{preprocessor}{#include "vlsisapd/cif/Polygon.h"}

\textcolor{keywordtype}{int} main(\textcolor{keywordtype}{int} argc, \textcolor{keywordtype}{char} * argv[]) \{
    \mbox{\hyperlink{class_c_i_f_1_1_circuit}{CIF::Circuit}}* circuit = \textcolor{keyword}{new} \mbox{\hyperlink{class_c_i_f_1_1_circuit}{CIF::Circuit}}(\textcolor{keywordtype}{string}(\textcolor{stringliteral}{"Transistor"}), \textcolor{keywordtype}{string}(\textcolor{stringliteral}{"micro"}),
       0.001);

    \textcolor{comment}{// Layer #6 corresponds to active}
    \mbox{\hyperlink{class_c_i_f_1_1_polygon}{CIF::Polygon}}* poly = \textcolor{keyword}{new} \mbox{\hyperlink{class_c_i_f_1_1_polygon}{CIF::Polygon}}(6);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(130, 290);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(540, 290);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(540, 690);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(130, 690);
    circuit->\mbox{\hyperlink{class_c_i_f_1_1_circuit_a5b37e86206e2a128ba6db4987dc09a39}{addPolygon}}(poly);

    \textcolor{comment}{// Layer #17 corresponds to polysilicium}
    poly = \textcolor{keyword}{new} \mbox{\hyperlink{class_c_i_f_1_1_polygon}{CIF::Polygon}}(17);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(305, 150);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(365, 150);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(365, 830);
    poly->\mbox{\hyperlink{class_c_i_f_1_1_polygon_ab3047469780327f18539907e1303ea15}{addPoint}}(305, 830);
    circuit->\mbox{\hyperlink{class_c_i_f_1_1_circuit_a5b37e86206e2a128ba6db4987dc09a39}{addPolygon}}(poly);

    circuit->\mbox{\hyperlink{class_c_i_f_1_1_circuit_a90c823b70c4984f302c19ceca604d101}{writeToFile}}(\textcolor{stringliteral}{"./transistor.cif"});
    
    \textcolor{keywordflow}{return} 0;
\}

\end{DoxyCodeInclude}


\begin{DoxyNote}{Note}
In order to compile this code, a C\+Make\+Lists.\+txt file is provided. User must set the \$\+V\+L\+S\+I\+S\+A\+P\+D\+\_\+\+T\+OP variable before running these commands in the directory containing the C\+Make\+Lists.\+txt file\+: 
\begin{DoxyCode}
%> mkdir build; cd build
%> cmake ..
%> make
\end{DoxyCode}

\end{DoxyNote}
\hypertarget{cif_cifPython}{}\subsection{Python}\label{cif_cifPython}
Here is the Python code ({\ttfamily drive\+Cif.\+py}) used to generate the transistor.\+cif file. (Source is available in examples directory). 
\begin{DoxyCodeInclude}
\textcolor{keyword}{import} CIF
circuit = \mbox{\hyperlink{class_c_i_f_1_1_circuit}{CIF.Circuit}}(\textcolor{stringliteral}{"Transistor"}, \textcolor{stringliteral}{"micro"}, 0.001)
poly1 = \mbox{\hyperlink{class_c_i_f_1_1_polygon}{CIF.Polygon}}(6)
poly1.addPoint(130, 290)
poly1.addPoint(540, 290)
poly1.addPoint(540, 690)
poly1.addPoint(130, 690)
circuit.addPolygon(poly1)
    
poly2 = \mbox{\hyperlink{class_c_i_f_1_1_polygon}{CIF.Polygon}}(17)
poly2.addPoint(305, 150);
poly2.addPoint(365, 150);
poly2.addPoint(365, 830);
poly2.addPoint(305, 830);
circuit.addPolygon(poly2)

circuit.writeToFile(\textcolor{stringliteral}{"./transistor.cif"})
\end{DoxyCodeInclude}


\begin{DoxyNote}{Note}
In order to run the {\ttfamily drive\+Cif.\+py} script, user must ensure that \$\+P\+Y\+T\+H\+O\+N\+P\+A\+TH variable points to the directory containing C\+I\+F.\+so module. 
\end{DoxyNote}
