Questions tagged [flash-memories]

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182 views

How many times can flash be rewritten before an erase is required?

With flash memory, it's only possible to write by clearing bits from their erased (set) state, and the only way to set a bit is to erase the region containing it. If you only need to clear bits, then ...
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0answers
25 views

How to read / write data into a S25FL064L flash memory?

I try to read / write data (single byte) into an S25FL064L SPI flash memory with an nRF52 based radio SoC. The datasheet says that I have to enable a write to ...
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0answers
165 views

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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0answers
205 views

Flash memory programming failure

I'm working on an XScale PXA270 with NOR Flash on Chip select 0. Due to the obsolescence of the previous flash, my company changed it for an AMD/Spansion compatible MX29GL128. I'm trying to write on ...
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0answers
1k views

Does NOR flash have better life span than NAND?

I wanted to know which one has better life span, NAND or NOR flash and what is the reason? By life span I mean the number of erase cycles allowed per block. I read in the link https://en.wikipedia....
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0answers
165 views

Problems programming a 29GL256

I've been experimenting with Python scripts and using an Teensy 2.0 ++ to program different flash memories. So far I've found a script to program a 29GL128, which works perfectly, but I'm trying to ...
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0answers
15 views

M2S150 Smartfusion2 SPI Flash Format Issue

I am currently using the M2S150 Development kit (from microsemi), and am trying to get the SPI Flash to work as a USB mass storage device when I plug the board into my computer. I am running through ...
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0answers
81 views

STM32: Is it possible to write data to flash memory by using system bootloader when write protection is on?

When I try to program with STM32 flash loader and if the write protection is on, it want erase all of the memory. Probably because of program drop the security level so MCU erase all of the data. But ...
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0answers
36 views

S25FL064L flash isn´t answering

I want to use the above flash memory to store some data with my MCU, but the flash isn´t answering on the 0x9F instruction: I use SPI mode 0 and a 125 kHz clock ...
0
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1answer
54 views

Why my data in MSP430 flash was lost?

I am using MSP430F5340 MCU, IDE is IAR workbench,today after adding some lines of code, I found my data that previously stored in flash was crashed. So I supposed the code memory size in flash has ...
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0answers
38 views

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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2answers
143 views

Using SPI to manipulate Flash Memory (Code in C)

for a couple of days i have been trying to write a C code that writes to a flash memory via SPI. I already have a code that writes characters into flash. Now i wanted to expand on it and write integer ...
0
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1answer
41 views

Bit Lines at SRAM

I would like to know the specific purpose for SRAM having a bit line and a negated bit line? I might think that is due to stability reasons, but I would like to know more details about its specific ...
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0answers
48 views

FRAM : excessive erase of one memory cell can damage another memory cell?

Erroneously , we made excessive erase of FRAM first 1024 bytes multiple times (millions and more erases). Afterwards we observed that memory upper half is damaged (part of it). Can it be that ...
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0answers
37 views

RX63N has NAND or NOR internal flash?

I need to read the internal flash of RX63N MicroController multiple times. It will always be the same data block. I was concerned about the life of the internal flash, wearing out etc. I read that NOR ...
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2answers
417 views

VSCode ESP-IDF framework esp32 SPIFFS error

I’ve beet trying for days and days now to make SPIFFS work on my esp32 board using PlatformIO in VSCode following the following example: https://github.com/espressif/esp-idf/tree/master/examples/...
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0answers
28 views

Information about component quality in general and quality of memory IS25LP128-JBL

Most of us are faced with component quality especially when producing product in higher quantities. What is he right place to find information about component quality in general? Currently we faced ...
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0answers
67 views

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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0answers
423 views

AVR perform Checksum on itself

I would lije to perform a CRC or Checksum for the FLASH memory of my device, an AVR32UC3, this will be performed by blocks, so I'm thinking that the prototype can be: ...