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The Verilog Procedural Interface (VPI), originally known as PLI 2.0, is an interface primarily intended for the C programming language. It allows behavioral Verilog code to invoke C functions, and C functions to invoke standard Verilog system tasks.
File I/O has been improved by several new system tasks. And finally, a few syntax additions were introduced to improve code readability (e.g. always @*, named parameter override, C-style function/task/module header declaration). Verilog-2001 is the version of Verilog supported by the majority of commercial EDA software packages.
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. DPIs allow transfer of data between two domains through function ...
Generally, however, software programming languages do not include any capability for explicitly expressing time, and thus cannot function as hardware description languages. Before the introduction of System Verilog in 2002, C++ integration with a logic simulator was one of the few ways to use object-oriented programming in hardware verification ...
Functions can now be declared void, which means it returns no value. Parameters can be declared any type, including user-defined typedefs. Besides this, SystemVerilog allows convenient interface to foreign languages (like C/C++), by SystemVerilog DPI (Direct Programming Interface).
The original Verilog simulator, Gateway Design's Verilog-XL was the first (and only, for a time) Verilog simulator to be qualified for ASIC (validation) sign-off. After its acquisition by Cadence Design Systems, Verilog-XL changed very little over the years, retaining an interpreted language engine, and freezing language-support at Verilog-1995.
The activity factor, A int, denotes the average percentage of gates switching per clock cycle and is allowed to vary from function to function. The capacitive load, C L, is a combination of fan-out loading as well as wiring. An estimate of the average wire length can be used to calculate the wiring capacitance.
C to HDL tools convert C language or C-like computer code into a hardware description language (HDL) such as VHDL or Verilog. The converted code can then be synthesized and translated into a hardware device such as a field-programmable gate array .