built-in repair

**Built-in repair** is **on-chip repair control that automatically applies redundancy resources after defect detection** - Test results feed repair engines that program remap structures and store repair information. **What Is Built-in repair?** - **Definition**: On-chip repair control that automatically applies redundancy resources after defect detection. - **Core Mechanism**: Test results feed repair engines that program remap structures and store repair information. - **Operational Scope**: It is applied in semiconductor yield and failure-analysis programs to improve defect visibility, repair effectiveness, and production reliability. - **Failure Modes**: Repair-state management errors can cause inconsistent behavior across power cycles. **Why Built-in repair Matters** - **Defect Control**: Better diagnostics and repair methods reduce latent failure risk and field escapes. - **Yield Performance**: Focused learning and prediction improve ramp efficiency and final output quality. - **Operational Efficiency**: Adaptive and calibrated workflows reduce unnecessary test cost and debug latency. - **Risk Reduction**: Structured evidence linking test and FA results improves corrective-action precision. - **Scalable Manufacturing**: Robust methods support repeatable outcomes across tools, lots, and product families. **How It Is Used in Practice** - **Method Selection**: Choose techniques by defect type, access method, throughput target, and reliability objective. - **Calibration**: Validate repair-flow state machines and retention behavior with repeated power-cycle tests. - **Validation**: Track yield, escape rate, localization precision, and corrective-action closure effectiveness over time. Built-in repair is **a high-impact lever for dependable semiconductor quality and yield execution** - It increases shipped yield by recovering otherwise failing units.