As design sizes have grown, the volume of test data required for comprehensive testing has become a major concern. Test compression addresses this challenge by encoding test vectors in compressed form on-chip, decompressing them during test application, and compressing test responses before shifting them out. This approach dramatically reduces test data volume and test application time while maintaining high fault coverage.
Embedded deterministic test technology combines deterministic test pattern generation with on-chip compression, achieving compression ratios of 100x or higher. On-chip decompressors expand compressed test patterns into the full scan chains, while compactors compress multiple scan chain outputs into a smaller number of observation points. The compressed test interface typically requires only a handful of pins, making it practical for wafer-level testing where probe card complexity limits available test access.
A testing solution is classified as high quality based on objective, quantifiable performance metrics: As design sizes have grown, the volume of
Efficient DFT techniques allow for faster, more automated testing.
As digital circuits grew from thousands to billions of transistors, external testing via input/output pins became physically impossible. This challenge drove the development of Design for Testability (DFT), which modifies a circuit design to simplify test generation. A testing solution is classified as high quality
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turn complex sequential logic into manageable testing blocks, allowing the chip to test itself. The High-Quality Edge: As design sizes have grown
The pursuit of requires a holistic approach integrating multiple methodologies, tools, and best practices throughout the design and manufacturing lifecycle. No single technique provides complete coverage of all potential defects. Instead, high-quality test solutions combine complementary approaches that together achieve the required quality levels.