The {\bfseries Design Technology Rules (D\-T\-R)} format was developped as a part of the Chams Project (\href{http://www-soc.lip6.fr/recherche/cian/chams/}{\tt http\-://www-\/soc.\-lip6.\-fr/recherche/cian/chams/}). It aims at offering a generic description of layout design rules for C\-M\-O\-S technologies.\par
Only simple rules are supported at the moment. For example the minimum width of a metal layer has only one value, although it should depends on the length of the wire drawned.\hypertarget{dtr_dtrDB}{}\section{Stand alone database structure}\label{dtr_dtrDB}
\item\hyperlink{class_d_t_r_1_1_techno}{D\-T\-R\-::\-Techno} contains generic informations such as the name of the technology and the unit used, and the list of all technologic rules.
\item\hyperlink{class_d_t_r_1_1_rule}{D\-T\-R\-::\-Rule}\&\hyperlink{class_d_t_r_1_1_a_rule}{D\-T\-R\-::\-A\-Rule} respectively describe a symmetrical and an asymmetrical rule.
The library also use the \hyperlink{class_d_t_r_1_1_d_t_r_exception}{D\-T\-R\-::\-D\-T\-R\-Exception} class to throw excptions.\hypertarget{dtr_dtrParser}{}\subsection{Using the parser}\label{dtr_dtrParser}
Simply load a technology with static function \hyperlink{class_d_t_r_1_1_techno_acf863c2bdb7f1aacc4422c8155c60d17}{D\-T\-R\-::\-Techno\-::read\-From\-File()} and then get rules (\hyperlink{class_d_t_r_1_1_techno_a4d56a05b47bd6c51e4e18120f49b584b}{D\-T\-R\-::\-Techno\-::get\-Rule()}) or directly values (\hyperlink{class_d_t_r_1_1_techno_ac08e2e60dd16750551221ca908001057}{D\-T\-R\-::\-Techno\-::get\-Value()}).\hypertarget{dtr_dtrDriver}{}\subsection{Using the driver}\label{dtr_dtrDriver}
Using the driver is very simple, user has to create a \hyperlink{class_d_t_r_1_1_techno}{D\-T\-R\-::\-Techno} object and simply add \hyperlink{class_d_t_r_1_1_rule}{D\-T\-R\-::\-Rule} or \hyperlink{class_d_t_r_1_1_a_rule}{D\-T\-R\-::\-A\-Rule} to it. The adding methods return the newly created Rule so user can set the rule type (\hyperlink{class_d_t_r_1_1_rule_a3568407d7a7890c39b8c9acc1e608535}{D\-T\-R\-::\-Rule\-::set\-Type()}) if necessary. Finally use the \hyperlink{class_d_t_r_1_1_techno_a26b05539dd3345963b8708788b82e2cb}{D\-T\-R\-::\-Techno\-::write\-To\-File()} method to dump the database to file.\hypertarget{dtr_dtrExamples}{}\section{Examples}\label{dtr_dtrExamples}
As said is the global presentation, V\-L\-S\-I S\-A\-P\-D project provides C++ libraries and Python modules for each supported format. In this section we present simple code examples to parse and drive a D\-T\-R file using C++ or Python. The D\-T\-R file considered is the same for all examples\-: {\ttfamily example.\-dtr.\-xml}
<< \textcolor{stringliteral}{"minSpacing of active vs poly = "} << techno->\hyperlink{class_d_t_r_1_1_techno_ac08e2e60dd16750551221ca908001057}{getValue}(\textcolor{stringliteral}{"minSpacing"}, \textcolor{stringliteral}{"active"}, \textcolor{stringliteral}{"poly"})
<< endl
<< \textcolor{stringliteral}{"minExtension active over poly = "} << techno->\hyperlink{class_d_t_r_1_1_techno_ac08e2e60dd16750551221ca908001057}{getValue}(\textcolor{stringliteral}{"minExtension"}, \textcolor{stringliteral}{"poly"}, \textcolor{stringliteral}{"active"}
In order to compile these codes, a C\-Make\-Lists.\-txt file is provided. User must set the \$\-V\-L\-S\-I\-S\-A\-P\-D\-\_\-\-T\-O\-P variable before running these commands in the directory containing the C\-Make\-Lists.\-txt file\-:
14 \textcolor{keywordflow}{print}\textcolor{stringliteral}{"minWidth of metal1 = %s"}%techno.getValue(\textcolor{stringliteral}{"minWidth"}, \textcolor{stringliteral}{"metal1"})
15 \textcolor{keywordflow}{print}\textcolor{stringliteral}{"minSpacing of metal1 = %s"}%techno.getValue(\textcolor{stringliteral}{"minWidth"}, \textcolor{stringliteral}{"metal1"})
16 \textcolor{keywordflow}{print}\textcolor{stringliteral}{"minSpacing of active vs poly = %s"}%techno.getValue(\textcolor{stringliteral}{"minSpacing"}, \textcolor{stringliteral}{"active"}, \textcolor{stringliteral}{"poly"})
17 \textcolor{keywordflow}{print}\textcolor{stringliteral}{"minExtension active over poly = %s"}%techno.getValue(\textcolor{stringliteral}{"minExtension"}, \textcolor{stringliteral}{"poly"}, \textcolor{stringliteral}{"active"})
18 \textcolor{keywordflow}{print}\textcolor{stringliteral}{"minArea of metal1 = %s"}%techno.getValue(\textcolor{stringliteral}{"minArea"}, \textcolor{stringliteral}{"metal1"})
19
20 \textcolor{comment}{# an example of why it is important to use Decimal in python:}
In order to run these two scripts ({\ttfamily parse\-Dtr.\-py}\& drive\-Dtr.\-py), user must ensure that \$\-P\-Y\-T\-H\-O\-N\-P\-A\-T\-H variable points to the directory containing D\-T\-R.\-so module.
