14. Behavioral Modeling in Verilog

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In Behavioral modeling, digital circuits are designed based on the behaviour of the circuit. Here designer focuses more on meeting functional requirement rather than synthesized hardware. Behavioral modeling describes how a digital system behaves rather than how it is physically built. It focuses on algorithmic and procedural descriptions using constructs similar to high-level programming languages.

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Behavioral modeling is:

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• Time-oriented (event and delay based)

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• Procedural in nature

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• Widely used in RTL design, testbenches, and verification

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Behavioural modelling allows designers to describe WHAT a circuit does rather than HOW it is implemented. 

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It focuses on the algorithmic description of the design using:

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• Procedural blocks (initial and always)

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• Sequential execution of statements

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• Conditional statements (if-else, case)

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• Loop constructs (for, while, repeat)

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• Procedural assignments (blocking and non-blocking)

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At RTL level, behavioral modeling bridges the gap between functional intent and synthesizable hardware.
Here, abstraction level is higher than other modeling techniques.

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When to Use Behavioral Modeling: