| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for properly executing timing calibration in an initialization sequence. SOLUTION: A memory interface has: a first delay circuit (23) for delaying data supplied to an input buffer (21); a second delay circuit (24) for delaying data read from an output buffer (21); a data writing circuit (25) for supplying data to a memory (5) through the first delay circuit (23); a data reading circuit (26) for reading the data written in the memory (5) through the second delay circuit (24) to set them as reading data; and a control circuit (20) for detecting a position of a start terminal part and a position of an end terminal part of an eye opening formed according to fluctuation of a data signal, specifying an intermediate position between the start terminal part and the end terminal part, and determining a difference between the intermediate position and the start terminal part as a phase difference between the data signal and a data strobe signal. COPYRIGHT: (C)2010,JPO&INPIT
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