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A 3.3V 32Gb NAND-Flash memory with 3b/cell is demonstrated in 34nm technology. The device features a programming throughput of 6MB/s on blocks configured as 3b/cell mode and can dynamically switch up to 13MB/s in 2b/cell mode. A new quad-plane architecture and an optimized programming algorithm are adopted to achieve the design targets.
NAND flash memories are used in digital still cameras, cellular phones, MP3 players and various memory cards. As seen in the growing needs for applications such as solid-state drives and video camcoders, the market demands for larger-capacity storage has continuously increased and NAND flash memories are enabling a wide range of new applications. In such situations, to achieve larger capacity at low...
We present our study on the effect of field oxide recess on cell-programming-speed uniformity of nand flash cell memory. Due to the short distance between the control gate and the shallow-trench-isolation (STI) edge, the control-gate voltage generates uniform distribution of an electric field on the STI edge and provides strong immunity to fabrication process variation in cell programming. Therefore,...
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