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What's the difference between nand flash and nor flash?


Asked by Rylee Brewer on Dec 03, 2021 FAQ



NAND flash vs. NOR flash. The two main kinds of flash are NAND and NOR flash memory, which get their names from their respective logic gates. NAND flash memory is written and read in blocks that are smaller than the device, whereas NOR flash memory reads and writes bytes independently.
Moreover,
• NOR flash is more reliable and has less percentage of bit flipping, while NAND flashes require an addition bit for error management. • NAND flashes are suitable for data storage while NOR flashes are suitable for code storage. • NAND flash memory is cheaper compared to NOR flash memories in terms of cost per volume.
Keeping this in consideration, In NOR flash, cells are connected in parallel to the bitlines, allowing cells to be read and programmed individually. The parallel connection of cells resembles the parallel connection of transistors in a CMOS NOR gate. In NAND flash, cells are connected in series, resembling a NAND gate.
Consequently,
SPI NOR flash, also called serial NOR flash, has become the standard because it is a much smaller form factor with fewer connector pins, but it retains the same memory density and speed as parallel NOR flash memory.
And,
NAND flash memory is a type of flash memory that stores data in arrays of memory cells that were made using floating-gate transistors. It contains two gates, namely, the control gate and the floating gate, and in order to program a single cell, a voltage charge must be applied to the control gate.