| 摘要 |
<p>PURPOSE:To prevent malfunction where a column line moves between a dummy word line and a dummy word and to shorten an access time by detecting the drive of a predecoder and driving the dummy word line of a dummy cell when said predecoder drive is detected. CONSTITUTION:A dummy decoder 28 is actuated by the output of a circuit 31 which detects the working of a pre-X decoder 25. A Y decoder 26 works after detecting the rise of a dummy word line DW, and a column line C has a fall. In this case, the line DW has a rise slightly later than a word line W. Then the line C has a fall after the rise of the line DW is detected.</p> |
