We employed vSync tools at a late stage of our ASIC project, and discovered serious CDC problems that would have led to a complete malfunctioning of the product. The problems were discovered by vChecker at the pre-fabrication stage of the design, and in order to save time, we solved them by rerouting and constraining inside the final P&R netlist database. The employment of vSync platform allowed us to avoid re-fabrication, saving a lot of money and time.