Apple Inc.
Memory calibration with end point replay

Abstract:

A method and apparatus for performing memory calibration with endpoint replay is disclosed. A first calibration of a data strobe signal in a memory subsystem is performed. The first calibration includes determining initial values of first and second endpoints indicative of first and second delay values, respectively, applied to the data strobe signal. A second calibration of the data strobe signal is performed around these endpoints, within a range thereof that is less than a full range there between. Based on the second calibration, the endpoints are adjusted.