TWO DIMENSIONAL DATA EYE CENTERING FOR SOURCE SYNCHRONOUS DATA TRANSFERS

摘要

Method for optimizing a source synchronous clock reference signal timing to capture data from the memory device (e.g., DDR SDRAM) is a two-dimensional data eye (data eye) search for optimizing a source synchronous clock reference signal (e.g., DQS) repeatedly It involves the embodiment. Embodiments of the invention relates to maximizing the noise margin on the adjustment as the delay to maximize the two-dimensionally for each device to obtain the optimal margin, that is, the distance from the data eye wall interface. While varying the DQS delay timing and noise margin is carried out iterative data eye search. ; Source synchronous data transfer, the data eye (eye), noise margin