Functional safety implementation in automotive semiconductor design requires more than basic fault awareness. Safety intent must be defined, captured, implemented, verified, and preserved through the physical design flow. ISO 26262 provides the framework for automotive electric and electronic safety, while ASIL classification defines the required level of safety rigor based on probability, controllability, and severity. USF provides a structured way to capture safety intent so that specification, validation, implementation, verification, modeling, and analysis can use consistent safety information. Safety mechanisms improve diagnostic coverage by detecting failures and moving the design toward a safe state. These mechanisms help protect against failure modes, malfunctioning, soft errors, random errors, and radiation-induced charge effects in semiconductor devices. Dual Core Lock Step and Triple Modular Redundancy are two major hardware safety mechanisms. DCLS uses a master path, checker path, and comparator to detect mismatches. TMR uses one parent flop, two clone flops, and voting logic to preserve the correct value when one redundant element is affected. Redundancy alone does n...