| 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, a differential amplifier, 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. At this moment, a value of the write current is restricted to a value which does not exceed VLIMIT/R1 by the differential amplifier. R1 is a wiring resistance of the write word line.
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