Questions tagged [non-volatile-memory]

Memory which maintains it's value through power cycles.

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70 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 ...
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1answer
83 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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124 views

Handling Large Variable Data with a Microcontroller

What is good practice for storing and manipulating variable data in a microcontroller circuit when the data may exceed microcontroller working memory? In my application, I am designing an access ...
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2answers
78 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' ...
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1answer
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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 ...
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4answers
121 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 ...
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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 ...
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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 ...
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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 ...
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How to determine SPI memory IC compaibility

I'm designing a PCB that includes an ISD3900 for voice recording and playback, for a personal project. This particular device requires an SPI flash memory IC to accompany it. The design guide states ...
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1answer
27 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 ...
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1answer
617 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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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 ...
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169 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 ...
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1answer
93 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 ...
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1answer
103 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 ...
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1answer
123 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 ...
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2answers
160 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 ...
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1answer
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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 ...
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1answer
126 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,...
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1answer
104 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 ...
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1answer
300 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,...
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1answer
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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)...
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1answer
87 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 ...
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1answer
144 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 ...
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1answer
175 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 ...
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2answers
329 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 ...
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1answer
706 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 ...
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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 ...
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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 ...
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1answer
286 views

Persistent circular buffer with CC3220SF

I'd like to share with you some thoughts about a project to see if there are better solutions than mine... I'm designing a board based upon CC3220SF, that requires an external flash (16 Mbit) where ...
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What is the correct way to implement heavy-write persistent memory? [duplicate]

I'm designing a current meter, which should retain the Ampere-hour count during power loss (e.g. power cable is disconnected without regard for first saving the data). The Ampere-hour value could be ...
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2answers
347 views

How, could hardware write protect be implemented for flash media?

I come from a software background, but feel this is a hardware/electronics question. Looking for a way to hardware-write-protect on flash media, I bought an SDHC card (with a tiny switch labelled "...
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2answers
499 views

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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1answer
253 views

Are EEPROM chips getting obsolete?

I am making a circuit with a microcontroller that has a periodic need to save about 500 bytes of information in a non-volatile storage. Running only on a supercap that might be charged up rarely, the ...
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1answer
645 views

FPGA Configuration Flash as General Purpose Memory After Boot

I am currently working on a system with a Spartan-6 FPGA and have a need for some low volumes of non-volatile memory to be used during system operation. My question is, since I have a relatively ...
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299 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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Preserving state of variables in RAM on Power Failure

I'm developing a code with Nuc240(ARM Cortex M0) Microcontroller. Where I need to store the value in some of the variables to the Internal Data Flash. I use ISP procedure for this, but i have seen the ...
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1answer
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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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2answers
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Programming a SRAM with Arduino

I'm currently trying to test some old NVSRAMs to make sure they work before I put them to use. Id like to test them independently and I'm thinking a arduino might do the trick. In theory, should a ...
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2answers
3k views

How does an SD card communicate with a computer? [closed]

Could someone please give me a concise explanation to how an SD card sends and receives data from a computer. Does it do this one bit at a time? How does the computer/SD card combine these individual ...
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1answer
235 views

DIL IC for simple non-volatile memory [closed]

Can anyone suggest a DIL IC where I can store a couple bits of memory without having to use a complicated interface like serial, I2C, and etc. I want to be able to store at least 2 bits of memory to ...
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1answer
701 views

Where to store non-volitile variables on ARM microcontroller

Noob question here. I have only a little experience with microcontrollers and all that experience was limited to the 8051. I am working on a project and would like to use the ARM cortex M4 ...
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1answer
508 views

Is it possible to read erased flash memory?

In hard disks, a "quick format" does nothing to the actual data on the disk - just clears the FAT (file allocation table), which then appears as a "blank disk" to the user. Therefore, it is fairly ...
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2answers
1k views

FPGA non-volatile progamming

I recently bought a Cyclone II FPGA here. I have been able to program it with a USB Blaster cable and the Altera Quartus Software. The problem is that when I disconnect power, I lose the program. ...
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2answers
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How long until my eMMC is dead?

I got some feedback from our software team. Apparently we're writing twenty 4KB blocks per second. I have a 4GB eMMC. The eMMC has a max number of P/E cycle of 3000. I'm making the assumption that ...