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What is the flash memory ?

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leebluer

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flash memory

what is flash memory? I have an opportunity to do such a project, but I know nothing about it. what is the difference between that and SRAM/DRAM. is it a promising project?
Thank you for any help in advance!
 

Re: flash memory

leebluer said:
what is flash memory?...what is the difference between that and SRAM/DRAM.
It's a non-volatile memory technology

is it a promising project?
what do you mean by "promising"... ?
 

Re: flash memory

:arrow: Flash memory is the unit where the software of your microprocessor is stored. But RAM is used to store random data which is necessary for miroprocessors computations. Another difference is Flash memory has a limited write-erase lifetime.


________________________________________________________
 

Re: flash memory

ertug said:
:arrow: Flash memory is the unit where the software of your microprocessor isstored
.

It can be ROM, EPROM or EEPROM too



ertug said:
:arrow:
Another difference is Flash memory has a limited write-erase lifetime.


________________________________________________________


Not really, 10000 time is not enough for you ?
 

Re: flash memory

Ok,
It seems that people do not want to answer the question here.

**broken link removed**

Flash: is a type of Electrically Erasable Programable Read Only Memor (EEPROM) based on Flash technology. (not based on this graph, which I dissagree with).

Like any other ROM, it keeps it's informaiton without the need for external power.

There are many different type of flash on the market, but in general they share the same basics, the IC can be erased, re-programmed and it keeps the informaiton for a very long time.

SRAM is a Static Random Access Memory, which means the data can be stored inside the memory and the IC will keep the information as long as you have supply power to it, the word Static means that you do not need to do anything other than keeping the power to keep the information in that memory. But it will loose all the stored information when the power goes down and you need to store the date into it again.

DRAM, is Dynamic Random Access Memory, it works like SRAM, with a difference that it needs "refresh" to keep it's informaiton. The data is stired in a capacitor like "bits" that needs continues (dynamic) action to "refresh" the information and keep it "alive".

But, the question here is what had Flash, DRAM, SRAM anything to do with analog deisng? They are all digital components, unless you are looking for designing an IC from scratch (ASIC) and want to know the analog behavior of each unit.

Take a loog at this site, and you will find more detailed info about different memory types:

**broken link removed**

Hope this helped to understand different type of memory.

BR,
/Farhad
 

flash memory

Flash memory utilizes floating gate technique to read and write the information, and it can be rewitable.
 

Re: flash memory

Here's a brief introduction to flash memory I used for staff training.
Hope it would be helpful.

Please give me a message and leave your mail address if you'd like to recieve the ppt file.
 

Re: flash memory

to leebluer....

Flash momory design requires extensive knowledge of device, process and circuit design. For a general flash circuit, logic control (custom design or coding), analog circuit (bandgap, current mirror, pumps or boost), memory architecture (array segmentation, memory decoding and data sensing) are all included.

Yes. It's promising. Not only for commodity flash (like the chips used in MP3 and DSC) but also for the embedded sysmtems (uC+embedded momory or DSP+embedded memory).

I've been working on flash design for over 8 years and I'm still learning!!
 

Re: flash memory

Introduction to Flash Memory
PROCEEDINGS OF THE IEEE, VOL. 91, NO. 4, APRIL 2003
 

Re: flash memory

Is there any good book or reference on flash memory (detail explanation of flash and circuits required for flash memory)
 

Re: flash memory

Analog sense amplifiers for high density NOR flash memories.pdf
 

Re: flash memory

i want to download some books about Flash Memory design,But can't
 

Re: flash memory

yanggeng007 said:
i want to download some books about Flash Memory design,But can't

Flash memory can be divided into two categoried: NAND and NOR.

Intel, AMD, Sumsung, ST are big players in NOR market.
Sumsung is super big vendor in NAND market.

NOR is more expensive and used to store CODE in mobile systems, due to its high speed.
NAND is cheap and used to store data which does not require speed and reliability.

Basically, it is a comodited market. It is more technology driven other than design driven. Cost is No.1 there. So, i do not like it much.
 

Re: flash memory

ROM, EPROM or EEPROM too
 

Re: flash memory

dumeHCM said:
ertug said:
:arrow: Flash memory is the unit where the software of your microprocessor isstored .

It can be ROM, EPROM or EEPROM too
-----> here we ONLY talk about FLASH


ertug said:
:arrow:
Another difference is Flash memory has a limited write-erase lifetime.


________________________________________________________


Not really, 10000 time is not enough for you ?
----> But LIMITED, isn't it???
 

Re: flash memory

briefly:

(1) eeprom - non-volatile for storing data, can erase bit by bit and re-write

(2) flash - function exactly similar to eeprom, but can only erase by page. size much smaller than eeprom, that's why market tuning to flash when page-erase getting smaller and smaller.

(3) sram, dram - volatile, data stored here use for temporary and fast execution. much faster than eeprom and flash.
 

flash memory

SPANSION have ORNAND flash product with MIRRORBIT technology. Futher information can refer to spansion.com
 

Re: flash memory

tok47 said:
SPANSION have ORNAND flash product with MIRRORBIT technology. Futher information can refer to spansion.com

this must be a amd guy, haha
 

Re: flash memory

What is the difference between NAND and NOR?

I know that NOR is code storage device and NAND is data storage device. How about the architecture wise? Why NAND device can have much bigger storage?
 

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