| 摘要 |
<p>PROBLEM TO BE SOLVED: To compensate for a change of a threshold voltage by feeding a higher selection voltage to a corresponding selected word line as a read selection cell is closer to a bit line. SOLUTION: 16 word line voltage generators 40A-40P output selection voltages of different levels. For example, the circuit 40P outputs 1V as a voltage for a word line WL16, and the circuit 400 outputs 1V+0.6/15V as a voltage for a word line WL15. 16 differentiated selection voltages are thus sequentially output. At the time of a read operation, these selection voltages of different levels are selected by a row decoder 10 and supplied to subject word lines. For passing a read voltage Vread in the non-selected word lines at this time, a predetermined bus voltage is impressed. When a bit line voltage is generated through a predetermined voltage decrease from the read voltage Vread from a second selection transistor ST2, a higher selection voltage is impressed to a memory cell closer to a bit line.</p> |
