What is DPI?? Well, The easiest answer is Direct Programming Interface. The DPI is used to communicate the system verilog/ Verilog code to any other language. Well DPI has its own advantages over PLI. You can check out the differences between the DPI and PLI HERE . With DPI, you can directly call the c-functions from system verilog code and vice versa. With lot of SOCs and complicated chips in the silicon industry, sometimes you cannot completely live with the generic UVM/System verilog to write complete stimulus for complete chip. Basics of DPI, Basics of DPI can be found when you google it. There are some interesting cases where you will find the uses of DPI. I will get through some advanced take aways from IEEE 1800.2012 LRM. You cannot export the objects with in class. You can export only from static objects. exporting the tasks/functions should be in a module/program/interface scope.[or any static scope] . ..... Bear with me as this post might be so