References: Testbenches and Simulation
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Functional verification - Wikipedia - Overview of verification methodologies in digital design.
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Logic simulation - Wikipedia - Explanation of digital simulation techniques and tools.
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Verilog Testbench - ChipVerify - Comprehensive guide to writing testbenches including stimulus generation and self-checking techniques.
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EDA Playground - EDA Playground - Free online simulation environment supporting Verilog, SystemVerilog, and multiple simulators.
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HDLBits: Verilog Practice - HDLBits - Interactive exercises including testbench-related problems.