In recent years, the performance is the most important in real time image and video applications. As circuit speed increases with shrinking device dimension, the clock frequencies increase and the effects of clock skew and jitter on a system becomes an increasingly larger percentage of Data Valid window (tDQV). If false lock prevails, by detecting and correcting the pulse to withstand the data. There is no system exists to handle this type of issues in the realistic implementations. A Double-Data-Rate Synchronous Dynamic Random Access Memory (DDR SDRAM) is an example of an application that uses a Delay-Locked Loop (DLL) to maximize the data valid window.