| 摘要 |
One end of a write word line is connected to a decoder/driver unit. The decoder/driver unit is constituted by a P channel MOS transistor, an N channel MOS transistor, and an NAND circuit. When WRITE, CHRDY and RA1 all become "H", an output signal from the NAND circuit becomes "H", and a write current flows through the write word line. CHRDY is a signal which becomes "H" upon completion of an initialization operation of all internal circuits after turning on a power supply. A limiting circuit is constituted by a clamp circuit which limits a potential of a write word line to a fixed value or a lower value.
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