Provided are a time synchronizing method and apparatus based on a time stamp. In particular, the method and apparatus of the present invention provides for detecting the differences in reflectance between the different materials within certain localized regions or zones on the surface of the wafer. A standard set of features are provided for robust communications while permitting the addition of more features to enhance the multimedia communications experience. The buried N-doped region is disposed in the substrate under the N-type epitaxial layer and connected to the first N-type well.