X-NAND architecture is a breakthrough of 3D NAND flahs memory technology. It combines QLC density and SLC speed. It can achieve 3X random read/write speed and 15-30X sequential read/write speed of conventional NAND. With low cost and high performance, X-NAND is a key technology for 5G, AI, and IoT applications.
X-NAND architecture divides the array into 16-64 planes (Y-direction) with the same or less page buffers than the conventional, This provides ultra-high speed without increasing the die size.
Conventiona 3D NAND flash memory only has 2-4 planes (Y-direction) due to the die size can only fit 32-64KB of page buffers. The huge capacitnace of the long bit lines causes very slow speed.
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