Questions tagged [non-volatile-memory]
Memory which maintains its value through power cycles.
149
questions
0
votes
0
answers
38
views
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 ...
1
vote
3
answers
166
views
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 ...
- 2,636
2
votes
0
answers
52
views
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, ...
- 16.1k
1
vote
1
answer
126
views
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:
...
- 133
0
votes
1
answer
24
views
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 ...
- 9,948
0
votes
2
answers
189
views
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
6
votes
1
answer
430
views
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 ...
- 200
8
votes
3
answers
1k
views
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 ...
- 1,807
-1
votes
1
answer
108
views
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?
- 109
0
votes
1
answer
113
views
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 ...
- 198
1
vote
0
answers
127
views
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 ...
- 11
8
votes
3
answers
5k
views
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 ...
user285637
1
vote
2
answers
168
views
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 ...
- 33
0
votes
0
answers
66
views
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 ...
0
votes
1
answer
58
views
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 ...
- 1
0
votes
2
answers
118
views
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 ...
0
votes
0
answers
597
views
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-...
- 153
1
vote
1
answer
78
views
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, ...
- 11
0
votes
1
answer
279
views
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 ...
- 119
2
votes
1
answer
409
views
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'...
- 141
0
votes
0
answers
220
views
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 ...
- 273
0
votes
2
answers
314
views
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 ...
- 23
0
votes
1
answer
249
views
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.
...
- 533
1
vote
1
answer
151
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 ...
0
votes
1
answer
153
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):
...
- 5,956
0
votes
1
answer
35
views
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 ...
- 15
4
votes
3
answers
933
views
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 ...
- 1,324
0
votes
2
answers
81
views
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 ...
- 13.7k
1
vote
1
answer
68
views
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 ...
- 15
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 ...
- 67
1
vote
2
answers
116
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 ...
- 269
1
vote
1
answer
37
views
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 ...
1
vote
1
answer
2k
views
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 ...
- 149
0
votes
3
answers
126
views
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 ...
- 1,400
1
vote
1
answer
260
views
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 ...
- 97
5
votes
2
answers
991
views
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 ...
2
votes
2
answers
241
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
1
answer
183
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 ...
- 2,118
0
votes
1
answer
150
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 ...
13
votes
8
answers
5k
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?
- 2,066
0
votes
0
answers
237
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.
- 101
0
votes
1
answer
90
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 ...
- 77
1
vote
3
answers
360
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
2
answers
80
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
1
answer
217
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 ...
- 101
2
votes
1
answer
196
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 ...
- 207
0
votes
0
answers
116
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 ...
- 123
4
votes
1
answer
5k
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 ...
- 1,316
0
votes
1
answer
70
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 ...
- 477
1
vote
1
answer
110
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 ...
- 29