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US09099183B2 Program VT spread folding for NAND flash memory programming 有权
用于NAND闪存编程的程序VT扩展折叠

Program VT spread folding for NAND flash memory programming
Abstract:
Embodiments of methods and systems disclosed herein provide a NAND cell programming technique that results in a substantially reduced Tprog to complete a programming operation. In particular, embodiments of the subject matter disclosed herein utilize two Vpgm programming pulses during each programming iteration, or loop. One of the two programming pulses corresponds to a conventional programming Vpgm pulse and the second pulse comprises a programming pulse that having a greater Vpgm that is greater than the conventional programming Vpgm so that the slow cells are programmed to PV in fewer pulses (iterations), thereby effectively simultaneously programming and verifying cells having different programming speeds.
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