FLASH MEMORY

SUBMITTED BY:-

AMIT UDHWANI

CONTENT :-

.HISTORY

.TYPES OF FLASH MEMORY.NOR FLASH.NAND FLASH

.LIMITATIONS

.USES OF FLASH MEMORY

.EXAMPLE OF FLASH MEMORY

.FLASH MEMORY

.INTERNAL STRUCTURE OF FLASH MEMORY

.MANUFATURE OF FLASH

.FUTURE OF FLASH MEMORY

.ADVANTAGE

FLASH MEMORYFlash memory is a non-volatile memory.That can be electrically erased and reprogrammed

It was developed from EEPROM (electrically erasable programmable read-only memory)

Flash memory is a new memory technology that allowed stores data to be saved when the memory device was disconnected from its power sources

HISTORY:-.Flash memory was invented dr. fujio masuoka

while working for tosibha in 1980.

.Intel corporation introduced the first commercial nor type flash chip in 1988.

.Tosibha announced nand flash at the 1987 international electron device meeting.

INTERNAL STRUCTURE OF FLASH MEMORY

Types of flash memory:-1.NOR FLASH:-

2.NAND FLASH:-

Standard NAND flash has 8 transistors in parallel

NOR Flash MemoryNOR flash memory was first introduced by

Intel in 1988.Developed to replace read only memoryNOR flash is more expensive and takes

longer to erase and write new data.NOR is most often used in mobile phones.

Can access any memory cellSlow sequential access

NAND Flash MemoryNAND flash was introduced by Toshiba in 1989.Developed to replace hard disks NAND has significantly higher storage

capacity than NOR.  It has found a market in devices to which large files are frequently uploaded and replaced.MP3 players, digital cameras and USB drives use NAND flash

Can only access pagesFaster sequential access

Manufacturers of Flash

USES OF FLASH MEMORY

.Flash memory generally used in computers, television,

set-up box, cell phone, digital cameras, mp3 players, global position system.

.We used the flash memory to store our data reprogrammed data.

.Flash memory is also used in much industrial applications.

EXAMPLE OF FLASH MEMORY

PEN DRIVES

MEMORY CARDS

SOLID STATE DRIVE

APPLE FLASH MEMORY

ADVANTAGE OF FLASH MEMORY:-

The advantage of flash memory is this:-

1. Flash memory is very durable and portable devices which we use every where easily.

2. Flash memory is immersion in water.

3. We can store much and more data in flash memory.

4. We can read and erase our data easily

Sept 2007 13

Flash memory limitation/disadvantage:-Both NAND/NOR memory has limited number

of programming/erasure cycles

About 100,000 cycles is a typical number, even though cells with higher cycle numbers can be designed

Virus can easily transfer in flash memory.

When flash memory is crash then data is lost.

Future of Flash MemoryContinues to be among the most aggressively

scaled electronic technologies Memory cell size minimum of 20 nm expected to be met in 2010 May be replaced by Phase-Change RAM or other emerging technologies.

In the future size of flash memory cell is decrease and the capacity is increase.

CONCLUSION

Flash memory is a widely used reliable and fixable non-volatile memory to store software code and data in a micro controller. However as with any programmable and erasable memory. Physical parameters must be understood and the application for a long time data retention time. And cumulative program must be handled according to the DATA sheet

ReferencesWikipedia - Flash Memory

How Stuff Works - Flash Memoryhttp://smithsonianchips.si.edu

THANKS

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