chiplet known good die

**Known Good Die for Chiplets** is the **test strategy that ensures each chiplet meets quality targets before multi die assembly**. **What It Covers** - **Core concept**: uses wafer sort plus package level screens for latent defects. - **Engineering focus**: protects expensive advanced packages from bad die insertion. - **Operational impact**: improves assembled product yield and field reliability. - **Primary risk**: insufficient screening can create costly package scrap. **Implementation Checklist** - Define measurable targets for performance, yield, reliability, and cost before integration. - Instrument the flow with inline metrology or runtime telemetry so drift is detected early. - Use split lots or controlled experiments to validate process windows before volume deployment. - Feed learning back into design rules, runbooks, and qualification criteria. **Common Tradeoffs** | Priority | Upside | Cost | |--------|--------|------| | Performance | Higher throughput or lower latency | More integration complexity | | Yield | Better defect tolerance and stability | Extra margin or additional cycle time | | Cost | Lower total ownership cost at scale | Slower peak optimization in early phases | Known Good Die for Chiplets is **a practical lever for predictable scaling** because teams can convert this topic into clear controls, signoff gates, and production KPIs.