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INTRODUCTION
Most people don't think of VHDL as a verification language. However, with the Open Source VHDL Verification Methodology (OSVVM) utility and verification component libraries it is. Using OSVVM we can create readable, powerful, and concise VHDL verification environments (testbenches) whose capabilities are similar to other verification languages, such as SystemVerilog and UVM.
This article covers the basics of using OSVVM's transaction-based test approach to write directed tests, write constrained random tests, use OSVVM’s generic scoreboard, add functional coverage, add protocol and parameter checks, add message filtering, and add test wide reporting.
WHY VHDL? WHY OSVVM?
According the 2018 Wilson Research Group Functional
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