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Comparison and difference of Nor Flash, Nand Flash, eMMC flash memory

日期: 2020-05-20
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Flash memory is a form of electronically erasable programmable read-only memory that allows multiple erases or writes during operation. This technology is mainly used for general data storage, as well as the exchange and transmission of data between computers and other digital products, such as memory cards and USB flash drives. Flash memory is a non-volatile memory, so in terms of saving data, it does not need to consume power.

Compared with hard disks, flash memory also has better dynamic shock resistance. These characteristics are why flash memory is widely adopted by mobile devices. Flash memory has another feature: when it is made into a memory card, it is very reliable, even if immersed in water, it is enough to resist high pressure and extreme temperatures. The write speed of flash memory is often significantly slower than the read speed.


NOR Flash

NOR Flash takes a long time to erase, but it provides complete addressing and data bus, and allows random access to any area on the memory, which makes it very suitable for replacing old ROM chips. At that time, ROM chips were mainly used to store codes that hardly need to be updated, such as computer BIOS or set-top box firmware. NOR Flash can tolerate 10,000 to 1 million erase cycles, and it is also the basis of early removable flash storage media. Compact Flash was originally based on NOR Flash, although it later switched to NAND Flash with lower cost.

Comparison and difference of Nor Flash, Nand Flash, eMMC flash memory


Nand Flash

 NAND Flash was published by Toshiba at the International Symposium on Solid State Circuits (ISSCC) in 1989. To read and write data on NandFlash, external control and circuit design are required. . NAND Flash has a faster erase time, and the area of each memory cell is also smaller, which makes NAND Flash have higher storage density and lower cost per bit compared to NOR Flash. At the same time, its erasable times are ten times higher than NOR Flash. However, the I / O interface of NAND Flash does not have random access to the external address bus. It must be read in a block manner. The typical block size of NAND Flash is hundreds to thousands of bits.


Comparison and difference of Nor Flash, Nand Flash, eMMC flash memory

Because most microprocessors and micro-controllers require byte-level random access, NAND Flash is not suitable to replace those ROMs used to load programs. From this perspective, NAND Flash is more like secondary storage devices such as optical disks and hard disks. NAND Flash is very suitable for mass storage devices such as memory cards. The first removable storage media created on the basis of NAND Flash is Smart Media. Since then, many storage media have also adopted NAND Flash, including MultiMediaCard, Secure Digital, Memory Stick and xD cards.


eMMC

The eMMC memory eMMC (Embedded Multi Media Card) was established by the MMC Association. The eMMC is equivalent to the NandFlash + main control IC. The external interface protocol is the same as the SD and TF cards. It is mainly for embedded memory standards for mobile phones or tablet computers and other products. specification. An obvious advantage of eMMC is the integration of a controller in the package, which provides a standard interface and manages flash memory, allowing mobile phone manufacturers to focus on other parts of product development and shorten the time to market. These features are equally important for NAND suppliers who want to reduce lithography size and cost.

Comparison and difference of Nor Flash, Nand Flash, eMMC flash memory


eMMC consists of an embedded storage solution with MMC (multimedia card) interface, flash memory device (Nand Flash) and main controller, all in a small BGA package. The interface speed is up to 52MBytes per second, eMMC has fast and scalable performance. At the same time, the interface voltage can be 1.8v or 3.3v.

Now many smart TVs have gradually abandoned Nor or Nand and used more advanced eMMC chips. However, ordinary programmers cannot read and write eMMC chips. The newly developed programmers that support eMMC chip programming are cost-effective and can also support Nor and Nand. Chip, support comprehensive and powerful







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