Fast innovation in VLSI technologies makes possible the integration of a complete system into a single chip (System-on-Chip, or SoC). In order to handle the resulting design complexity, reusable modules (called cores) are being used in many SoC applications. System designers can purchase cores from core vendors and integrate them with their own User-Defined Logic (UDL) to implement SoCs. Core-based SoCs show important advantages: design re- use guarantees lower end-product cost and reduced time-to-market, but introduces new constructive criticalities whose impact on production yield is not...