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Questions tagged [non-volatile-memory]

Memory which maintains its value through power cycles.

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What is the memory address for 24AA16 EEPROM IC?

I am using 24AA16 EEPROM IC to read and write. But i don't know exactly the memory adddress to write something in this IC and also read from that. This is the datasheet for this IC, https://ww1....
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STM32F302xx Flash Location

recently I tried to flash my STM32F302CCT7 with a ST-link, openOCD, and gdb for arm. I am using the rust toolchain which requires that the ROM and RAM locations to be specified in a memory.x file when ...
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What do NRAM cells look like?

Note: I don't have any electrical engineering experience, so I'd like to apologize for my bad vocabulary about this subject. I'm currently exploring the memory world and stumbled across NRAM which got ...
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External NOR Flash malfunctioning

External NOR Flash malfunctioning Part used: ZD25WQ16CTIGT Zetta NOR Flash We are using Zetta family 16MBit NOR Flash in a partitioned format. One partition is used as an emulated EEPROM, and another ...
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How to implement a solid-state non-volatile switch?

I found this heavily downvoted question about how to implement a non-volatile switch (i.e. a switch that remembers its last state even when power is removed). While the OP asked the question in a ...
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Is it safe to replace a 120ns Flash memory with a 90ns part?

Here is an old PLC board with a pair of AM29F200AB-120SI SOP-44 256kB 5V flash chips. One is unable to retain data, after nearly three decades in service. These are very challenging to find today, ...
rdtsc's user avatar
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NVRAM data is reset to 0 when using NVIC_SystemReset()

I am working on nRF52840 with Mbed5.15. Trying to persist data in NVRAM. In the linker script nRF52840.ld I have something like this: ...
r0n9's user avatar
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Why am I seeing erratic behavior by a variable stored in "information memory" on MSP430?

Sometimes a variable in information memory updates as expected and sometimes not. For example, I would expect the following program to print... 0 0 1 ...but, in ...
bigjosh's user avatar
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Behaviour Variables stored in non volatile memory after RESET [closed]

I need to know if a variable stored in a non volatile memory, after a Power On Reset do this variable return to its default value, or it keeps the last valid value before the reset
Oussama El Hassouni's user avatar
6 votes
1 answer
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eMMC data lines swapping

I'm routing an eMMC 5.1 device to a iMX6 microprocessor. When routing the DDR RAM, I've swapped several data lines to ease routing, following widely available documentation on the subject. There isn't ...
Nicolas's user avatar
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What are the "redundant bytes" added to every page of this NAND flash?

I was tinkering around some NAND flash memories and found out that some of them (not sure if it's all of them) have a few "redundant bytes" that are something of a mystery. (See related ...
Tirdad Sadri Nejad's user avatar
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STM microcontroller: Is there a way to reset and reprogram read-only memory?

I have an STM32F427VIT6 embedded microcontroler. It has a protected-memory bootloader. Is there a way to reset it and modify that bootloader?
RootInit's user avatar
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Microcontroller, Flash EPROM and RAM combination questions

I have chosen a specific microcontroller (MCU) for a project, based on price, package size, and speed. It's the NXP LPC1768FBD100, a 100 MHz ARM-based MCU with 512 KB program memory and 64 KB SRAM. My ...
Elementronics's user avatar
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Replacing CMOS SRAM with NV SRAM

I have an electronic board from a professional video device containing a 256K 8bit CMOS SRAM 28 pin DIP. I wish to replace this memory with a Nonvolatile 256K 8bit RAM 28 pin DIP, so that I can read ...
sunomono's user avatar
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How long can a micro SD card hold data without being powered? [closed]

I lost a micro SD card few years ego, and I'm worried that someone may find it and misuse the data stored in it. How long can a micro SD card keeps the data without being powered, ignoring other ...
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Non volatile memory on simple hardware board [duplicate]

I'm designing a low frequency board with some analog signals inputs and a few discrete logic gates which drive warning LEDs. I want to save the status of the LED even if the board is powered off. No ...
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How to debug problems on a FRAM communication?

I have a proprietary device with this FM25VN10 FRAM and, due to shortage, I had to replace a compatible model, which in this case is this one CY15B004Q. However, I am having struggling to have ...
Ricardo Goncalves's user avatar
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Alternate of the parallel flash

Hi I am looking for an alternate of the flash S29AL016J70BFI010, its a top boot sector device. unfortunately I have not found any 16Mb flash with top boot sectors. Although I am able to find 32Mb or ...
Manoj N's user avatar
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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 ...
nwretborn's user avatar
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Power Consumption for DDR3L SDRAM IC's

Designing a board that will utilize some DDR3L memory for the first time and looking to gain some confidence in some steps I've assumed/taken so far. I plan to use two 4Gb SDRAM IC's (MT41K256M16TW-...
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Is there internal flash ROM on a SD card?

I searched but could not find the answer to my question. What I want to know is this: do SD cards have internal flash ROM that enables the SD card to communicate/interface with a SD card reader, ...
Robert Braun's user avatar
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EEPROM memory erase bit vs word

If I have an EEPROM 1K X 16, can I erase bit by bit or just word by word (2 bytes/16 bits) in my matrix of registers ? In digital systems - TOCCI, the EEPROM is modeled by a matrix of registers, each ...
Felipe's user avatar
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2 votes
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Why is a Flash memory cell '0' when programmed and '1' when erased?

When a floating-gate transistor has no negative charge in the gate (i.e., it is erased), it conducts when the world-line voltage is applied to its gate terminal, pulling the bit-line to ground. Doesn'...
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Is erasing flash memory supposed to be this slow? (S25FL127S)

I'm trying to interface with a Cypress/Infineon S25FL127S (https://www.cypress.com/file/177961/download - 16MB SPI Flash module) and the Erase commands are very slow. Testing with two different ...
bgp's user avatar
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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 ...
Krauseler's user avatar
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1 answer
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Are operations on a MSP430's FRAM Atomic

In a MSP430 with internal FRAM, I am storing a long variable in FRAM with the following code. ...
Eric Johnson's user avatar
1 vote
1 answer
190 views

Micron MT25QL512ABB8ESF-0SIT not working after Non Volatile Configuration register setting

I'm using the STM32H7 Evaluation board. There is an on-chip QSPI DUAL NOR CHIP MT25QL512ABB8ESF-0SIT. After setting up the Non-volatile configurations Register value to 0x89D6 and power cycle, FLASH ...
Taher Kawantwala's user avatar
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1 answer
171 views

Microchip 48LM01 memory secure read operation CRC and STM32 hardware CRC

I'm trying to use STM32 hardware CRC calculation mechanism to get CRC value from this data (3 byte address and 128 bytes of data): ...
Kamil's user avatar
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Memory row driver does not have enough driving power

I am building the row driver of a piece of RRAM. Different from traditional memory, RRAM's cells are composed of resistor-like elements. I tried using a single inverter and a back-to-back inverter ...
Jeffrey Yu's user avatar
4 votes
3 answers
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Can EEPROMs have feedback networks to make state machines?

I have imagined a simple system that detects in which direction a stepper is going based on the voltages across the windings, and which emulates from that two end switches relying only on one single ...
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Search terms for serial number IC or memory dump without initialization?

I have an existing product which I'm tasked to add an electronically read serial number to. There are specialized ICs for the purpose but they all require some initialization or handshaking before the ...
winny's user avatar
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Industry Standard for Memory Address Decoder Design

I am currently designing the address decoder of a piece of ReRAM that will be sent to TSMC and manufactured. I have studied in class and textbook that there are two common address decoder designs. One ...
Jeffrey Yu's user avatar
2 votes
4 answers
1k views

Silicon-free amplifier

I'm working on building a silicon free computer and I need a way to store information after power off. Right now, solid core memory seems like the best option. However, the sense line of solid core ...
Firewolf's user avatar
1 vote
2 answers
129 views

Do bank/rows/columns based NOR flash memory exist?

SDRAM supports more addresses than their address bus width allows thanks to the bank/row/column scheme it's based on. My question is if there are non volatile parallel memories that are based on the ...
BamsBamx's user avatar
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1 answer
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Operative Definitions of Memory in Circuits

I've been studying Memristors (non-ideal) and some related circuits depending on pinched hysteresis of the IV for use in memory. I'm still puzzled by the lack of general framework for what constitutes ...
Lost In Euclids 5th Postulate's user avatar
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1 answer
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Why doesn't ESP32 support NAND flash?

Simple question, but I can't find anything on the internet about it. Why would Espressif not support NAND flash when it is the more economical option? I ask because I'm trying to integrate a 128MByte ...
David Cutting's user avatar
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Storing data for a really really long time [closed]

How might one store data for the far future? (100 years and up, possibly centuries) This is entirely hypothetical but would it be possible for semiconductor based data storage to have similar ...
crossroad's user avatar
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1 vote
1 answer
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Trying to understand the FLASH region of an STM32L433

I am trying to learn more about the STM32's FLASH memory (on the Nucleo-64 STM32L433RCT6P) so that I can use a page of the FLASH memory to store some user configuration (so that the data is retained ...
Cimory's user avatar
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2 answers
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How Many EEPROM Write Cycles Left in My EEPROM

I ordered some AT28C256 EEPROMs, but none of them were cleared, they all have some garbage programmed, probably from the last user. Obviously they're supposed to be clean and new. I wanted to ask, is ...
Yigit_Yildirim's user avatar
2 votes
2 answers
307 views

Physical Properties of Memristor from I-V characterestics

I'm trying to understand what an IV plot of a memristors tells me in terms of physical properties. So these are the questions with the relevant plots: If I have a pinched hysteresis loop that does ...
Lost In Euclids 5th Postulate's user avatar
2 votes
1 answer
221 views

How are the bitflip and row hammering effects taken care of by micro controllers in critical systems?

Bitflips/random hardware faults and row hammering are some of the things which could damage the memory. Do the current breed of latest microcontrollers, used in embedded systems, have any mechanism ...
Rookie91's user avatar
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Repair MRAM that's been exposed to a magnetic field

Is there any way to repair MRAM that has been exposed to a magnetic field? I've got a bit stuck (3rd bit) on my MRAM. Probably due to exposure to a magnetic field. Is there any way to fix this short ...
Arno van der Weijden's user avatar
13 votes
8 answers
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EEPROM being both "programmable" and "read-only"

Since it is called programmable, I tend to think that it should also be named with the write option. What is the deal here?
muyustan's user avatar
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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.
indira's user avatar
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Can I read programmed content inside any sort of non-volatile re-programmable memory device with Microscope, X-ray, etc.?

Non-volatile re-programmable memory like NAND flash, NOR flash, and etc. stores information in forms of electron charges and doesn't change in structural forms that can be inspected with X-ray or ...
user3498780's user avatar
1 vote
3 answers
442 views

How to store one bit without the use of an IC? [duplicate]

I am trying to store a bit of data from a circuit, but I don't want to use an IC like an EEPROM chip. Is it possible to store one bit with a transistor or something else to that effect?
Ryland Goldman's user avatar
1 vote
2 answers
97 views

Power On Tracking Integrated Circuit, ON Time Odometer [closed]

How would I realize a I2C/SPI device capable of tracking how long power has been applied over the lifetime of the device? Ideally this would be a 8 pin (or less) SMT part costing around a couple ...
Richard Hirsch's user avatar
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1 answer
244 views

Where is load-leveling data stored on a MicroSD card?

Reading this question on load-leveling of writes on a MicroSD card, Is it true that a SD/MMC Card does wear levelling with its own controller?, it prompted me to wonder where on the MicroSD card is ...
Milwrdfan's user avatar
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2 votes
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Mysterious NVM write protection

I'm implementing a serial bootloader on an ATSAME51N20A (Cortex-M4). I'm reading in packets of UART, and writing them to internal flash. For some memory addresses the flash writes work fine, and for ...
Peter Kapteyn's user avatar
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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 ...
ransh's user avatar
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