58 lines
3.2 KiB
Plaintext
58 lines
3.2 KiB
Plaintext
/*! \page agds AGDS Format
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\section agdsPres Presentation
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The <b>Ascii Graphic Database System (AGDS)</b> format is an ascii (text) version of the wellknown and industry standard GDS II binary format. This format hierarchicaly represents geometric shapes, labels and other layout informations (see http://en.wikipedia.org/wiki/GDSII for more informations). \n
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The ascii format has several advantages versus binary format:
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- human readable,
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- easy to edit manually or with dedicated tools,
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- easy to search or grep into,
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- easy to compare and understand differences between two files,
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- easy to convert.
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The conversion from Ascii GDS to binary GDS and vice versa can be done with <b>OwlVision GDSII Viewer</b> available at http://owlvision.org\n
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Since it has been developped in java, it can be run on all platforms.
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\subsection agdsAutrhos Author
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Damien Dupuis: damien.dupuis(at)lip6(.)fr
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\subsection agdsLimits Limitations
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Currently the only supported shape in this driver is the rectangle.
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\section agdsDB Stand alone database structure
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The database conists in for simple objects :
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- AGDS::Library contains all AGDS library informations such as the name, the units used (user and physical) and the list of all Structures.
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- AGDS::Structure describes a GDS Structure with a name and a list of Elements.
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- AGDS::Element is an abstract class from which derived the AGDS::Rectangle.
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- AGDS::Rectangle describes a rectangle element of a structure.
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\subsection agdsDriver Using the driver
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To drive an AGDS file, user has to create one AGDS::Library and add AGDS::Structure objects to it with the AGDS::Library::addStructure() method. Each AGDS::Structure contains at least one AGDS::Element added with AGDS::Structure::addElement() method.\n
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All objects can be independently created as far as they are correctly added to their parent. \n
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Once the library is completely specified, simply call the AGDS::Library::writeToFile() method to drive the database to file.
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\section agdsExamples Examples
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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 AGDS file using C++ or Python. These two examples drive the same file \c transistor.agds:
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\include transistor.agds
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\image html transistorCif.png AGDS example layout
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\image latex transistorCif.pdf AGDS example layout width=.25\linewidth
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\subsection agdsC C++
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Here is the C++ code (\c driveAgds.cpp) used to generate the transistor.agds file. (Source is available in examples directory).
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\include driveAgds.cpp
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\note 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:
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\code
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%> mkdir build; cd build
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%> cmake ..
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%> make
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\endcode
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\subsection agdsPython Python
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Here is the Python code (\c driveAgds.py) used to generate the transistor.agds file. (Source is available in examples directory).
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\include driveAgds.py
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\note In order to run the \c driveAgds.py script, user must ensure that $PYTHONPATH variable points to the directory containing AGDS.so module.
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*/
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