Oblon, McClelland, Maier & Neustadt, L.L.P.
Memory system
A memory system according to an embodiment includes a semiconductor memory and a memory controller. The semiconductor memory includes memory cells and a sequencer. Each of the memory cells stores first data when it has a first threshold voltage, and stores second data when it has a second threshold voltage. The sequencer performs a first write operation for write data. In the first write operation, the sequencer executes a program loop repeatedly and terminates the first write operation, when the verify operation for the first data has passed and the verify operation for the second data has not passed. The sequencer performs a second write operation for the write data based on a first command from the memory controller after the first write operation is terminated.
Toshiba Memory Corporation
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G11C G11C G11C G11C H01L H01L G06F G11C H01L G11C G06F G06F G11C G11C G11C H01L H01L G11C
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Kenji Kuminori Hideki Masanobu
Sakurada Hyodo Yamada Shirakawa