Program Language Interface (PLI)
The PLI provides a programmer with a mechanism to transfer control from Verilog to a program function written in C language. It is officially deprecated by IEEE Std 1364-2005 in favor of the newer Verilog Procedural Interface, which completely replaces the PLI.
The PLI enables Verilog to cooperate with other programs written in the C language such as test harnesses, instruction set simulators of a microcontroller, debuggers, and so on. For example, it provides the C functions tf_putlongp and tf_getlongp which are used to write and read the argument of the current Verilog task or function, respectively.
Read more about this topic: Verilog
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