Questions tagged [non-volatile-memory]

Memory which maintains it's value through power cycles.

Filter by
Sorted by
Tagged with
2
votes
0answers
27 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 ...
2
votes
1answer
64 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 ...
0
votes
1answer
61 views

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 ...
11
votes
8answers
4k views

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?
0
votes
0answers
36 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.
0
votes
1answer
27 views

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 ...
1
vote
3answers
80 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?
1
vote
2answers
45 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 ...
0
votes
1answer
41 views

How to design 1T-1C DRAM circuit in spice design tools, such as LTSPICE?

I have been trying to design a DRAM cell using the LTSPICE MODEL tool. The DRAM that I want to design is of 2nd GENERATION, i.e, 1t-1c dram cell. But whenever I design digit line it states the line is ...
0
votes
1answer
61 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 ...
2
votes
1answer
74 views

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 ...
0
votes
0answers
42 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 ...
2
votes
1answer
186 views

Write endurance: Is there a difference between eMMC and Micro SD Card?

I have seen several forum posts (link 1, link 2) debating whether eMMC offers an endurance advantage over SD cards for embedded applications. My understanding was that the write endurance problem is ...
0
votes
0answers
24 views

How to read from the FM25V20A-PG memory device using spi?

This is my first time working with SPI. I am trying to write and then read two bytes of data from the FM25V20A-PG external memory. The data sheet for the device can be found here: https://www....
0
votes
0answers
49 views

eMMC selection problem due to lifecycle

As you know while considering eMMC's lifecycle there are 3 technologies called SLC, MLC, and TLC. But I could not understand exact speed of these. i.e. MLC's lifecycle. Some say 3k like this one. ...
0
votes
1answer
49 views

Writing on one flash memory location could affect whole memory page

I am working on designing energy meter using PIC18F46K80. When the power goes off the meter store data on the flash memory (credit and so). Meter power supply stores enough energy to supply the ...
1
vote
1answer
64 views

Is writing in FeRAM memory cell destructive?

I have read that writing in Ferroelectric random access memory is not destructive. But in a WL||PL memory architecture, if I try to write a '0' in a cell and the adjacent cell holds a '1', shouldn't ...
0
votes
3answers
175 views

Is there any memory cell that can store more than one bit? [closed]

SRAM, DRAM, Flash, EPROM - all of the memory cells contain one bit of data each. Is there any memory cell that can store more than one bit, e.g. 2 bits/4bits?
0
votes
2answers
233 views

Programmable gain non inverting amplifier

I'm a hobbyist and like to design my own tools rather than buying chinese "kits" that teach nothing. I have been needing all sorts of amplifiers for different things and usually I would just use an ...
0
votes
1answer
131 views

How is an EEPROM different from a Flash memory? [duplicate]

I am trying to understand the terminology used for various non-volatile memory chips for example as EEPROM and Flash. Is there any preference to use the word EEPROM or Flash for specific type of ...
5
votes
4answers
2k views

Memory capability and powers of 2

Why are computer memory capabilities often multiples of a power of two, such as 2^10 = 1024 bytes? I think it is something related to the binary logic, but I do not understand the precise reason for ...
1
vote
2answers
127 views

Adapting an I2C FRAM chip to an SRAM-like parallel interface

I have a project that requires a parallel interface non-volatile RAM. I had hoped to use an FRAM, however the only parallel FRAMs seem to much larger in capacity (and more importantly, price) than I ...
12
votes
7answers
3k views

Need a non-volatile memory IC with near unlimited read/write operations capability

I need a memory solution which is going to be used to keep track of an accumulated count on a micro-controller based project. By accumulated count, I mean to say that the micro-controller uses this ...
0
votes
2answers
144 views

Initial data values of FRAM devices

I've got an FM25L16 FRAM part in a board design. For a new part from the manufacturer, what are the initial data values? All 0x00, or all ...
1
vote
2answers
98 views

I've seen many conflicting answers online: For optical storage, does a pit represent a '1' bit or does a land represent a '1' bit?

I've seen many conflicting answers online so: When reading an optical disk, which one of these is true: A 'pit' represents 1 and a 'land' represents 0 or A 'pit' represents 0 and a 'land' ...
0
votes
1answer
13 views

Is it possible to add a UID to M45PE10-VMN6?

Is it possible to add a UID to p/n M45PE10-VMN6 ? We need to add this security feature to these chips, but I am assuming it needed to be done at factory. Originally we could have purchased p/n ...
1
vote
4answers
228 views

Volatile keyword with ADC, USB interrupt readings

I was just reading an answer about global variables, it also stated that I should use volatile affix whenever a global is used in an interrupt. In my program I am using a 30 byte ADC buffer without ...
0
votes
0answers
77 views

W25q64 Nor flash does not get Erased

I am trying to write the data into the NOR flash but for some reason it is taking some random/garbage data . First i tried to erase the sector then i read the data from the same location which i have ...
7
votes
3answers
3k views

Why isn't there any EEPROM in STM32F4 MCUs? [closed]

Why isn't there any EEPROM in the STM32F4 series MCUs? Mostly I have Microchip MCUs and they have EEPROM available in them, but I just found out that it is not available in the STM32F4 MCUs... And it ...
0
votes
0answers
23 views

Can FOTA be performed by changing the execution point of the code i.e, changing the program counter in lpc1759

For FOTA can we divide the memory into two blocks, eg : block A and block B. And whenever there is a new version of firmware detected, we shall change the execution point of the code. Is this ...
0
votes
1answer
35 views

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 ...
0
votes
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....
21
votes
4answers
4k views

Why are SRAM based FPGA used more than NVM based FPGA?

SRAM based FPGAs need to load the bitstream again after power off. Meanwhile the Non-Volatile based one don't need that. I wonder, why are more experiments and security research done on the SRAM ...
1
vote
2answers
383 views

Why is there a need for an eNVM and an eSRAM in the same SoC FPGA

SmartFusion2 SoC FPGA is distinguished by containing an embedded Non-Volatile-Memory (eNVM) that is used to store the code needed for the booting process of the FPGA after power up. So in the presence ...
2
votes
1answer
105 views

What makes Smartfusion2 FPGA clamed as highly secure to ensure secure booting?

Is the FPGA Smatfusion2 claimed to be highly secure by its manufacturer (Microsemi, now Mircochip) because it is a non volatile memory FPGA? Meanwhile the SRAM FPGA like the zynq 7000 are considered ...
0
votes
1answer
220 views

How to work with eMMC from software developer point of view

I am facing a problem how to implement parameters management in an embedded software. Parameters management means that I have some subset of variables which values should be persistent but they will ...
1
vote
1answer
276 views

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 ...
0
votes
2answers
201 views

Atmega328p - Program works with 2.7V power supply but doesnt with 3.3V

I already posted this question on avrfreaks but so far I'm not getting many responses so decided to ask here as well. So I'll start by telling little bit how this project looks together for the ...
9
votes
1answer
1k views

How is a DRAM volatile with capacitors?

There are a few things I understand: DRAM stores each bit of data to a tiny capacitor with some potential difference. Unless the capacitor is connected to low voltage end, the potential difference ...
0
votes
1answer
150 views

How is normal ROM programmed [closed]

Perhaps this question may sound silly,and am sorry if there are similar questions answered already because i couldn't find one, as per guidelines. Mask ROM(MROM) are programmed while manufacturing,...
0
votes
1answer
114 views

How can I design a Caesar cipher encrypter and decrypter without using Non-programmable circuit components?

My device should be able to take an input from A-Z and another input to from 0-25 and finally a Encrypt or Decrypt option. Currently I have given A a code of 0000, B 0001... so on and the output will ...
1
vote
1answer
423 views

alternative to NAND chips

The company I work for is manufacturing a device with ARM processor and embedded Linux. At the time of the project (a few years ago) our consultants relied on NAND flash chips with UBIFS as filesystem,...
0
votes
1answer
130 views

multiprocessor programming and memory management [closed]

I'm working for a project (an embedded storage system) that requires to increase a memory access speed using a multiprocessors programming, so that we can execute a memory access program (storing data)...
0
votes
1answer
119 views

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 ...
1
vote
1answer
230 views

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 ...
-9
votes
1answer
277 views

Non volatile switches [closed]

Sometimes, chemical reactions need a small push in the right path to start and then, the reaction sustains on its own. Now is it possible to make a non volatile microelectronic switch by using some ...
3
votes
2answers
526 views

How does the Pre-charge and Equalizing circuit shown in the below figure work?

(from precharge circuit) Could you please explain the operation of the above circuit regarding how the transistors Q8 and Q9 are responsible for charging the Bit Lines with VDD/2 while Q7 equalizes ...
4
votes
1answer
873 views

Read and Write multi variable (Struct) from/to external FRAM memory over SPI by ATMEGA Using Code Vision

I am working on a project to read some data from ADC and store them in external FRAM over SPI. I have 8 different float values which need to save when the power is off or other specific situation and ...
0
votes
3answers
2k views

interfacing of eMMC to MCU

I am trying to interface a MCU to an external non-volatile memory. The MCU being considered is TM4C123GH6. The memory selected is an SD card which is interfaced via SPI. But the environment is a high ...
0
votes
0answers
55 views

What happens when the chip enable active time limit is exceeded?

The datasheet of a FRAM chip (FM1608-120-P) says that "the device has a maximum /CE low time specification that must be satisfied". The datasheet does not state what the consequences are when this ...