Questions tagged [flash-memories]

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Measurement of the retention period of a memory cell

Manufactures of Non Volatile memory devices give a quote for the Memory retention period of their device. To the best of my understanding, this period refers to the maximum period up to which the ...
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1answer
2k views

NOR Flash Memory Full chip vs Block vs Sector Erase

I am trying to use a NOR flash memory device: SST25VF016B (with STM32 discoveryboard F407VG). However, I am confused on some terms on their datasheet. You can find the datasheet here: https://www.elfa....
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47 views

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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2answers
75 views

Loop on flash memory

I have flash memory that I write assembly code on it. I know that flash has limit cycle ( read/ write) If I write a loop that run 100,000,000 times like ...
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1answer
152 views

How much Program Memory does PIC24FJ1024GB610 have?

PIC24FJ1024 got 1024KBytes of Program Memory. In the PIC24's Data Sheet in Chapter 4, mentions that the Program memory runs from 0x000000 to 0x7FFFFF which is 8,388 KByte. Can someone explain why ...
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497 views

Is it possible, and if so, how difficult would it be, to replace the volatile memory in Gameboy games with non-volatile memory?

my working knowledge of electrical engineering is quite limited, so please excuse me if my question has been answered under different terminology! I was looking at old Gameboy games, which require a ...
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1answer
212 views

Program SPI flash on board after soldering

I'm developing a USB DAC using XMOS XHRA-2HPA as USB->I2S interface. XHRA-2HPA is a sort of highly specialized uC which requires a firmware and configuration data to be stored on external SPI flash ...
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1answer
106 views

Code composer 6 linker file not placing variables

I am developing firmware on MSP430F2619. I need to store configuration information having 5 sections of 200 bytes. In order to read and write them independently I am trying to allocate 5 sections of ...
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1answer
731 views

how to properly use external memory flash with MCU (dsPIC33)

In my project, I need to store (and read) large amount of data ( >128 Mbits). Of course, I need external flash memory (I think SD card won't work because speed is an issue in my project). So I plan ...
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2answers
74 views

Micron NOR Flash datasheet clarification

I am working to create a controller for a Micron NOR Flash Memory (MT25QL128ABB) and I am having difficulty writing/reading the device. I would like to know if my procedure is correct: Write Procedure:...
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1answer
48 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
37 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
103 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 ...
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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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44 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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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
301 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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27 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
65 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
376 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: ...
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1answer
280 views

Insert certificates into an Atmel's ATWINC1500 via SAM ICE

With a Windows PC (mandatory to use since atprogram is made for Windows, if someone knows how to work with that at GNU/Linux will be much appreciated), when flashing our custom PCBs embedded hardware ...
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1answer
1k views

Write and read from AT45DB are two different things

I'm using an AT45DB642D Flash memory over SPI interface. there is no problem in reading and writing, however what I write and read are two different things. ...
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1answer
48 views

Flash Technology in Embedded system [closed]

I have been always wondering how the process of burning code on a chip happens, I mean physically. I do that dozen of times, but the sense of how this is invented, how the hexcode interpreted in TTL ...
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2answers
523 views

How does water affect a flash mempory chip? [closed]

If a flash chip is thrown into water will it affect the data stored inside or will it still be recoverable? And if so, will this be a gradual process or immediate one? Are flash chips waterproof or ...

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