8. Design for Testability Strategies
Design for Testability (DFT) strategies integrate testing requirements into the design process of electronic systems, facilitating improved verification and debugging. This approach not only enhances product quality but also reduces testing costs and time-to-market. Various DFT techniques such as scan-based testing, Built-In Self-Test (BIST), and boundary scan (IEEE 1149.1) are explored in this chapter, emphasizing their importance in modern electronics design.
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What we have learnt
- DFT ensures that testing is an integral part of the design phase, improving system verification and quality.
- Techniques like scan-based testing and BIST improve fault detection but may add complexity and power consumption.
- Design for Manufacturability (DFM) and Design for Reliability (DFR) are crucial for optimizing systems for manufacturing and long-term performance.
Key Concepts
- -- Design for Testability (DFT)
- A practice that integrates testability features into the design process to simplify verification and debugging.
- -- ScanBased Testing
- A DFT technique that employs scan chains to access internal states of a system during testing.
- -- BuiltIn SelfTest (BIST)
- An approach that allows a system to test itself using embedded test patterns and diagnostic routines.
- -- Boundary Scan
- A standardized technique to test interconnections between chips without needing physical access.
- -- Test Pattern Generation (TPG)
- The process of creating test vectors to stimulate a circuit under test, often utilizing Automated Test Pattern Generation (ATPG) tools.
- -- Design for Manufacturability (DFM)
- A strategy that simplifies the manufacturing process, aiming to reduce defects and improve cost-effectiveness.
- -- Design for Reliability (DFR)
- An approach that focuses on enhancing the reliability of a system by identifying potential failure points.
- -- Test Compression
- Techniques used to reduce the volume of test data generated and transmitted during testing.
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