source latency

**Source Latency** is **the delay from the external clock origin or PLL reference to the internal STA clock definition point** - It is a core technique in advanced digital implementation and test flows. **What Is Source Latency?** - **Definition**: the delay from the external clock origin or PLL reference to the internal STA clock definition point. - **Core Mechanism**: It captures board, package, and source-path effects before the designs internal clock network begins. - **Operational Scope**: It is applied in design-and-verification workflows to improve robustness, signoff confidence, and long-term product quality outcomes. - **Failure Modes**: Mis-specified source latency shifts timing margins globally and can hide systemic setup or hold risk. **Why Source Latency Matters** - **Outcome Quality**: Better methods improve decision reliability, efficiency, and measurable impact. - **Risk Management**: Structured controls reduce instability, bias loops, and hidden failure modes. - **Operational Efficiency**: Well-calibrated methods lower rework and accelerate learning cycles. - **Strategic Alignment**: Clear metrics connect technical actions to business and sustainability goals. - **Scalable Deployment**: Robust approaches transfer effectively across domains and operating conditions. **How It Is Used in Practice** - **Method Selection**: Choose approaches by failure risk, verification coverage, and implementation complexity. - **Calibration**: Align source latency with board timing, PLL characterization, and validated clocking assumptions per mode. - **Validation**: Track corner pass rates, silicon correlation, and objective metrics through recurring controlled evaluations. Source Latency is **a high-impact method for resilient design-and-verification execution** - It is required for accurate top-level timing accounting across integration boundaries.