The <b>Design Technology Rules (DTR)</b> format was developped as a part of the Chams Project (http://www-soc.lip6.fr/recherche/cian/chams/). It aims at offering a generic description of layout design rules for CMOS technologies.\n
\subsection dtrAutrhos Author
Damien Dupuis: damien.dupuis(at)lip6(.)fr
\subsection dtrLimits Limitations
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.
\section dtrDB Stand alone database structure
The database contains four object :
- DTR::Techno contains generic informations such as the name of the technology and the unit used, and the list of all technologic rules.
- DTR::Rule & DTR::ARule respectively describe a symmetrical and an asymmetrical rule.
- DTR::Name provides an automatic management of shared name.
Simply load a technology with static function DTR::Techno::readFromFile() and then get rules (DTR::Techno::getRule()) or directly values (DTR::Techno::getValue()).
\subsection dtrDriver Using the driver
Using the driver is very simple, user has to create a DTR::Techno object and simply add DTR::Rule or DTR::ARule to it.
The adding methods return the newly created Rule so user can set the rule type (DTR::Rule::setType()) if necessary. Finally use the DTR::Techno::writeToFile() method to dump the database to file.
\section dtrExamples Examples
As said is the global presentation, VLSI SAPD project provides C++ libraries and Python modules for each supported format. In this section we present simple code examples to parse and drive a DTR file using C++ or Python. The DTR file considered is the same for all examples: \c example.dtr.xml
\include example.dtr.xml
All source codes are available in the \c examples directory.
\subsection dtrC C++
\subsubsection dtrParseC Parser
The following code (\c parseDtr.cpp) is an example of how to parse a DTR file using C++ library.
\include parseDtr.cpp
\subsubsection dtrDriveC Driver
This C++ code (\c driveDtr.cpp) generates a out.dtr.xml file equivalent to the previous example.dtr.xml.
\include driveDtr.cpp
\note In order to compile these codes, 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:
\code
%> mkdir build; cd build
%> cmake ..
%> make
\endcode
\subsection dtrPython Python
\subsubsection dtrParsePython Parser
The following python script (\c parseDtr.py) is an example of how to parse a DTR file using python module.
\include parseDtr.py
\subsubsection dtrDrivePython Driver
This python script (\c driveDtr.py) generates a out.dtr.xml file equivalent to the previous example.dtr.xml.
\note In order to run these two scripts (\c parseDtr.py & driveDtr.py), user must ensure that $PYTHONPATH variable points to the directory containing DTR.so module.
