Semiconductor integrated circuit and data processing system

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United States of America Patent

PATENT NO 6285597





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A control of a flash memory includes control for supplying a pulse-shaped voltage to each of non-volatile memory cells until a threshold voltage of the non-volatile memory cell having a first threshold voltage is changed to a second threshold voltage. The control involves a first write mode (coarse write) in which the amount of change in threshold voltage of each non-volatile memory cell, which is varied each time the pulse-shaped voltage is applied, is relatively rendered high, and a second write mode (high-accuracy write) in which the amount of change in threshold voltage thereof is relatively rendered low. As compared with the high-accuracy mode, the number of pulses required to change the threshold voltage of each memory cell is smaller than that in the coarse write mode. Therefore, the number of verify operations at the time that the coarse write mode is used, is small and hence the entire write operation can be speeded up.

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Inventor Name Address # of filed Patents Total Citations
Kawahara, Takayuki Higashiyamato, JP 149 3084
Kimura, Katsutaka Akishima, JP 109 1917
Kotani, Hiroaki Ome, JP 50 1131
Kubono, Shoji Akishima, JP 36 747
Noda, Satoshi Ome, JP 78 1056
Nozoe, Atsushi Ome, JP 39 1019
Sato, Hiroshi Ome, JP 780 8092
Yoshida, Keiichi Ome, JP 86 2064

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