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Why is NAND memory called NAND?
A form of electronically erasable programmable readonly memory (EEPROM), NAND flash is programmed, erased, and reprogrammed in large blocks. It’s called NAND because at the circuit level, it’s similar to the NAND logic function.
What does NOR flash stands for?
NOR flash memory is one of the two popular types of flash memory. Flash memory is non-volatile computer memory that can be electrically erased and reprogrammed. Non-volatile means that no power is needed to maintain the information stored on the chip.
Where is NOR flash used?
NOR flash is most often used in applications where individual bytes of data need to be written and read, and is most often used where random access and execute-in-place access techniques are required. As each read access takes the same amount of time, sequential read access is no faster than random access.
How are NAND flash and NOR flash the same?
NAND flash and NOR flash use the same cell design, consisting of floating gate MOSFETs. They differ at the circuit level: in NAND flash, the relationship between the bit line and the word lines resembles a NAND gate; in NOR flash, it resembles a NOR gate; this depends on whether the state of the bit line or word lines is pulled high or low.
How does a memory cell read NAND flash?
To read NAND flash, every transistor is switched on in the cell except the one being read. Because it’s wired like a NAND gate, where if every signal is AND’ed you get a low, if you see a low on the bit line then you know the memory cell was set.
What’s the difference between NAND and NOR memory?
The two types of flash memory, NOR and NAND, differ in the way they read and arrange their data. – Accessing NOR flash memory works similarly to accessing random-access memory (RAM). You can execute in place (XIP) programs stored in NOR without having to copy the programs to RAM first.
What are the two types of flash memory?
The two main types of flash memory, NOR flash and NAND flash, are named for the NOR and NAND logic gates. NAND flash and NOR flash use the same cell design, consisting of floating gate MOSFETs.