Questions tagged [nand-flash]

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How does MMC compare to SD in terms of life expectancy?

There is supposedly new surface mount SD card ICs on the market (see https://hackaday.com/2020/12/29/new-part-day-sd-nand-are-surface-mount-chips-that-work-like-an-sd-card/) which I thought was ...
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Best memory choice for my sensor

I'm a software developer and trodding in murky waters here so please do forgive my lack of knowledge. I've been developing a sensor with the nRF9160DK and some accelerometers. I need to continuously ...
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How addresses are encoded in a Macronix MX35LF1GE4AB Nand flash memory chip?

I read the documentation for the Macronix MX35LF1GE4AB flash memory chip. And I attempt to implement a script that dumps its contents to a file. So I was reading the chip's documentation https://...
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Why is erasing NAND much faster than erasing NOR flash?

Why is erasing of a single block in NAND flash usually much faster than erasing a single block in NOR flash? For my current understanding: If all cells of the block share the same substrate and if all ...
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Replacing SD card with Flash Memory Chip

I have a design in which MicroSD card is used for Logging and critical system information files. Logging: text file of few MB. Max 16MB. System Information: File format is xml and size is around 200KB....
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Is a NAND flash chip better for power saving purposes as a micro SD card?

I know, they are technically the same, but from what I read, NAND flash chips can be controlled better like putting it into standby and waking it up in the matter of a few nanoseconds, which could be ...
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Why are Samsung NAND flash memory chips so hard to find?

I'm looking at NAND flash memory chips for a home project I'm working on. There seems to be quite a few manufacturers available, Micron seems a good choice (even though a lot of their chips, mostly ...
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Difference between 24 bit and 32 bit addressing mode in QSPI flash

I would like to know the difference between 24-bit and 32-bit QSPI flash? why 24-bit address is used in flash?
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Calculating data retention rate of SLC NAND

Background I am a software developer trying to calculate data retention rate of a NAND memory ic. I have minimal knowledge/experience with electronics. I have a constraint on data retention, 15 years. ...
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Does cooling the NAND chips on an SSD negatively affect its reliability?

The problem of heat dissipation in high-performance, small form-factor SSDs is well-known, for example, the paper Transient Thermal Analysis for M.2 SSD Thermal Throttling published in 2018 17th IEEE ...
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Why it is required to write each byte with 0 before erase in NOR flash?

It is written in some sites that for NOR flash, each byte has to be written with 0 before erase. Why it is required to write with 0 before erasing? Erasing the sector change each byte to 1.
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MLC NAND Flash page interleaving

I'm trying to understand the pattern used for page interleaving on word lines in MLC flash. I've come across a number of resources that show how even-odd paging works in detail, but the few examples ...
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Desoldering CPU from PCB or holding it in reset

I am currently working with a NAND flash that I want to dump. The goal is to take a look at the data that is stored in the filesystem. To do so I soldered 8 wires to the NAND flash to access it while ...
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File system to use with NAND Flash and 32 bit microcontroller

I am searching for a file system, suitable for NAND flash memory chips. Currently I use a Micron 256MB SPI NAND flash memory where I write and read raw sensors data but without a file system and ...
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Can't read an entire page at once (NAND flash)

I am working for quite a while now with a GD5F1GQ4UCYIG from GigaDevice. The goal is to dump the content of the flash. To do so I use a BusPirate. The NAND flash itself is still attached to the board,...
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User controlled storage devices existence

Today's memory devices have a lot of logic embedded before data is actually written onto the NAND pages. An example could be wear levelling algorithm , FTL functionalities etc. The typical life of a ...
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Executing a page read

I am working for a few months on dumping the content of a certain NAND Flash. This is the first time that I am doing this so I needed some time to get a good idea of how this works. The NAND Flash ...
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Why must a block in NAND SSDs be erased before it can be reprogammed? [closed]

Before programming a NAND based SSD in page-level we have to always erase by block-level which increases write amplification. why is it so and how do we mitigate it? what is the necessity of erasing ...
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RAM and Flash structure difference

I am trying to get a better understanding for RAM and Flash and I hope you could help me out with some things. What I know about Flash (or at least I think to know), is that there are different Flash ...
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What are two typical threshold voltages for a flash FET?

I have a simple question for you all: what is a realistic approximation of a pair of threshold voltages for a flash transistor? I am working with NAND flash, 45nm, with VDD = 0.8V. I can find lots of ...
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Offline (unpowered) storage time limit for NAND based drives? [closed]

What's the storage time limit for NAND based drives? Like Samsung EVO 850 or something similar? Also, since USB storage drives use NAND flash... what's the storage limit on them as well? When I ask ...
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Which pins are required when reading and writing NAND flash?

I plan on reading and probably writing NAND flash on some embedded devices or USB flash drives. I did not come across many examples for in circuit reading though I'd give that a try at first if ...
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Can I lower flash power consumption by pre-flashing all values to high?

I am designing an embedded system that will use either embedded flash memory or an SD card. The system must survive without much power and the estimated 30mA draw of an SD card sounds too high for me. ...
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invalid read data from nand flash

I want to use a nand flash ic with part number of K9F1G08U0C and connect it to a stm32f429igt6 microcontroller. Although I can read the ID of this nand successfully but the written data and read back,...
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NAND flash memory Organization issue

Organization Page size ×8: 18,592 bytes (16,384 + 2208 bytes) Block size: 1536 pages, (24,576K + 3312K bytes) Plane size: 4 planes × 548 blocks per plane Device size: 384Gb: 2192 blocks; ...
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Are there ways/technologies to use High negative voltages in flash memories?

I am using an FGMOSFET with tunneling gate and control gate as an analog memory for simulation in SPICE. I use -25V to inject electrons into the floating gate and 25V to remove electrons. Everything ...
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Writing data to external Flash Memory chip

I develop a microcontroller project that requires writing big chunks of data in a Micron 4Gb SPI NAND Flash memory and I am a little confused regarding manipulation of the Flash memory blocks. ...
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How to secure an EMMC

My department of the company I am working at is in charge of developing a circuit for production, and security in the embedded system is a crucial requirement. The current prototype of our embedded ...
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Possible to replace worn out NAND chips in solid state drives?

I understand that SSD endurance is typically much greater than advertised and disregarding any form of data recovery, is it possible to replace NAND chips in solid state drives (with the exact same ...
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Writing unused areas of a page on a NAND flash

I'm working on a project based on the ESP32 that uses a NAND chip from the GD5F1 family (link to the datasheet). Sorry for the long question, but it's a bit convoluted, and it's driving me nuts for ...
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Why is NAND flash slower than NOR when it comes to reading?

I have read on several places that NOR flash have lower latency when it comes to reading compared to NAND version but I don't understand is this architectural consequence or due to, often different, ...
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NAND technology - ecc error

Nand technology has some issues, which I find it a bit difficult to understand. It is said in nand devices that manufacture guaranty that a page will have no more than X (4/8/16,etc according to nand ...
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Memory dump size does not match size of MTD partition

Device with Linux embedded system on NAND flash memory. I did memory dump of some MTD devices partitions use serial console, from U-boot bootloader use available commands. First I read MTD partition ...
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Why are NOR flashes still used when NAND flashes have a bigger size?

I've seen a few systems that uses a NOR flash to boot from, and a NAND for a bigger filesystem. I've also seen a system with only NAND gets corrupted after files being written to and verified correct. ...
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What data is stored in an eeprom that’s not in the flash memory? [closed]

I’m wondering generally what information is stored in an eeprom that’s different than what’s in the flash drive that contains firmware? Mostly in mobile devices. Does the eeprom contain user settings ...
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How does NAND reading work?

Hi Now I'm trying to understand how does the NAND Flash reading work. AS I know, when the NAND FLASH reading work, the gate voltage go to 5v. then electrons flow depend on holes. then we can read ...
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On NAND or NOR flash, is program time completely independent of byte values?

I know that the erase value of NAND and NOR cells is all 1s, and the process of programming involves clearing bits. Is the program time of some x length data always the same, regardless of the number ...
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Which MSC Sub Class is the best for USB 3.0?

I have been looking at implementing the Media Storage Class on a FX3 from Cypress. There is already a pre-written firmware example using MSC BOT (Bulk Only Transport) and SCSI commands and I was ...
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Extremely high temperature on SSD

I've got an SM941 SSD and it became dead after shutdown while writing data. I decided to use up the nand flashes on it to DIY a new SSD. Then I get an controller board(SM2246EN) with NGFF size, SATA ...
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Is there any kind of backup for the data that is deleted during NAND flash block erase? [closed]

In NAND Flash, the whole block is erased.How is the data in that block that is not intended to be erased, gets recovered after it is erased? Is there some kind of Flash Memory Management Unit that ...
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SST 39VF1602 - NOR or NAND?

I have this flash chip, and I cannot figure out if it is a NOR or a NAND flash chip. Here is the datasheet. From the capacity of the chip (2M), I am assuming that it is a NOR chip, but I am not ...
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What type of FLASH (NAND or NOR) is used on microcontoller? [closed]

I am doing a study on file systems for mcirocontollers (MCU), using internal flash only. I find my self asking this questions: What type of FLASH memory is used most commonly in MCU ? NAND or NOR? ...
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Interfacing NAND flash to a microcontroller [closed]

I have a MP3 player with Samsung's nand flash chip (2GB), I want to connect that chip to microcontroller and read, write or list files and directories as we do with arduino SD Card Library. Your help ...
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How does triple level cell FLASH memory achieve 3 bits per cell?

Originally each cell of FLASH memory held either a high or low level or state, and reflected one bit of information; 0 or 1. Mutli-level FLASH was then developed, with often four levels of voltage ...
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NAND Flash vs NAND EEPROM

I'm not clear how (if) NAND EEPROM (made by Toshiba) is different compared to regular NAND Flash memories (except is cheaper). We want to use with SAM9G device that is support NAND devices such as ...
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May a warm reset by pulling down the reset pin of the SoC cause the file system corrupts?

In my embedded Linux system, I made a hardware switch to pull down the reset pin of the SoC(TI DM365). When the system is running, I can push the button to reboot the system. I want to know whether ...
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eMMC vc MMC storage

I came across this new technology for storage and I am still a bit confused. What are the basic differences between MMC and eMMC storage? If a microcontroller is marketed as supporting SD/MMC, can I ...
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Why NAND FLASH is slower than flip-flops?

I find that both NAND FLASH and flip-flops are made up of NAND gates. The only difference between them is NAND FLASH uses floating gate transistors to store charge. Your Flash drive is ...
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STM32F4 Mass Storage Device

I'm trying to build a msd with stm32f4 which will be connected to a pc with USB. I need to visualize it as "USB drive" formatted in FAT. Initially I was planning to use a nand flash but I can't use it ...
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5 votes
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Why can't NAND flash memory be a random access memory?

When I read any documents regarding NAND and NOR flashes. They say that NAND is sequential memory whereas NOR is random. I dont understand what stops NAND memory from being random too as the only ...
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