Circuit and capture data, control method of data acquisition system, and data capture circuit

摘要

PPROBLEM TO BE SOLVED: To provide a data fetch circuit, which surely cuts off transmission of a high impedance state of a data strobe signal even if a manufacturing condition or an operation condition is changed, and a control method thereof. PSOLUTION: This data fetch circuit includes an RL measuring part 10 for measuring a latency measurement value RLB from an input of a read instruction signal RD to a valid edge of a data strobe signal DQS and an RL count comparing part 30 for outputting a BL count start signal BST for giving an instruction of a cancel of the cut-off of the data strobe signal DQS after standing by during the time based on the latency measurement value RLB in accordance with an input of a delay read instruction signal RDD. PCOPYRIGHT: (C)2008,JPO&INPIT