Abstract: A method for robust preamble location and gate training in a Double Data Rate type Three (DDR3) computing environment. A single algorithm is employed to begin sampling a Data Strobe Signal (DQS) at a maximum delay value designed to fall within the driven region of a DQS. The method then begins sampling the DQS in a sequence of delay values from right to left. Each result of the sampling indicating a high state and a low state are stored as well as the occasions where the DQS transitioned from high to low indicating a rising edge. At a consecutive number of samples returning a low state, the method determines the preamble has been reached and discontinues sampling. The method retains the most recently stored rising edge as the first rising edge and configures the result for gate training.

Abstract: A method for robust preamble location and gate training in a Double Data Rate type Three (DDR3) computing environment. A single algorithm is employed to begin sampling a Data Strobe Signal (DQS) at a maximum delay value designed to fall within the driven region of a DQS. The method then begins sampling the DQS in a sequence of delay values from right to left. Each result of the sampling indicating a high state and a low state are stored as well as the occasions where the DQS transitioned from high to low indicating a rising edge. At a consecutive number of samples returning a low state, the method determines the preamble has been reached and discontinues sampling. The method retains the most recently stored rising edge as the first rising edge and configures the result for gate training.