| 摘要 |
PROBLEM TO BE SOLVED: To provide a memory unit which can raise efficiency of bus line transmitting both-direction data strobe signal using CTT and has a low power consumption, a memory system provided with it, and a control method of data strobe signal. SOLUTION: The memory system of this invention is a memory system in which data strobe signal is not driven to a high impedance Hi-Z state even when the data strobe output driver in a memory unit is in active standby section, and the signal is driven in valid logical level until state in which data strobe signal must be driven to the high impedance Hi-Z state occurs, to prevent that data strobe bus line becomes the half of power source voltage in standby interval. COPYRIGHT: (C)2006,JPO&NCIPI
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