When to Use UDPs

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• Simple combinational logic (2-3 inputs)

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• Basic sequential elements (simple flip-flops)

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• When truth/state table is simpler than code

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• Educational purposes (clarity)

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When to Use Modules

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• Multiple outputs needed

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• Vector (multi-bit) operations

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• Complex logic

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• Need to instantiate other components

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• More than 10 inputs

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16.3.2. Best Practices and Guidelines

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General Guidelines

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• Use descriptive names: udp_and, udp_dff (not u1, u2)

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• Always initialize sequential UDPs

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• Comment the truth/state table

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• Test thoroughly with all input combinations

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• Use don't cares (?) to simplify tables

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• Document edge sensitivity clearly

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Table Formatting

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• Align columns for readability

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• Add comments for each section

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• Group related entries

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• Use consistent spacing

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Common Best Practices Table