| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor memory device provided with a preamble function. SOLUTION: The semiconductor memory device has the preamble functions provided with a data control unit generating a data signal in response to data generated inside of the semiconductor memory when a latency signal setting latency of the semiconductor memory device is activated, an output driver for generating an output data strobe signal in response to the data signal, a preamble control unit for outputting a preamble control signal in response to a read-out instruction input to the semiconductor memory device, and a preamble unit for shifting an output terminal of the output driver from a high impedance state to a logic low when the preamble control signal is activated and preambling the output data strobe signal. Thereby, the output data of the semiconductor memory device can secure a preamble section sufficiently. COPYRIGHT: (C)2008,JPO&INPIT
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