Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Direct Programming Interface (DPI) is an interface which can be used to interface SystemVerilog with foreign languages. These Foreign languages can be a C, C++, System C as well as others. DPI's consists of two layers: A SystemVerilog Layer and a Foreign language layer. Both the layers are isolated from each other.Direct Programming Interface (DPI) allows direct inter language function calls between the SystemVerilog and Foreign language. The functions implemented in Foreign language can be called from SystemVerilog and such functions are called Import functions similarly functions implemented in SystemVerilog can be called from Foreign language (C/C++ or System C) such functions are called Export functions. DPI's allows transfer of data between two domains through function arguments and return.

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