Questions tagged [flash-memories]
The flash-memories tag has no usage guidance.
72
questions
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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:...
0
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1answer
46 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 ...
1
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1answer
81 views
How many excess electrons are in a modern SLC flash memory cell?
A colleague told me that in a modern SLC flash memory cell there are about 400 electrons.
However, I can't find any reference to this.
Flash memory cells can be thought of as little buckets of ...
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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.
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1answer
36 views
Built in Self Test - In Embedded memories
I am reading this thing called -BIST (Built in Self Test).
I understand that, before a module enters its intended functionality, this BIST is made to run within the module. Once, this BIST is passed, ...
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2answers
96 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 ...
0
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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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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 ...
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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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1answer
91 views
Finding Rise time and Fall time with Slew Rate Specification
I am using this QSPI Flash Memory IC
I'm operating the QSPI clock at 48MHz. I am probing the Clock and Data signals in my scope.
On Table 54 which is on Page 128, we have Rise time and fall time ...
0
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1answer
236 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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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.
...
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1answer
178 views
Calculation of Power Dissipation of Memory ICs and Microcontrollers
Can someone tell me how to calculate the power dissipation of digital ICs like Nand Flash, QSPI NOR Flash and Microcontrollers?
For Microcontrollers, we can get the power dissipation for GPIO like, ...
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2answers
112 views
What's the right way to read ID and CFI info from flash memory chips?
Our product has flash memory chip, but we have used more than one variant. The first is a SST/Microchip one and the second is a Spansion/Cypress.
To determine which type is mounted, I read the flash ...
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0answers
26 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 ...
0
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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 ...
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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 ...
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2answers
72 views
Reading current memory image from a micro controller
I have the MPLAB XPress Evaluation Board, which has the PIC16F18855 microcontroller on it. The way to program it is just to copy a ...
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2answers
2k views
OTA Programming of STM32
I am currently using ST32L152RE controller interfaced with BLE CC2640R2F module and 4 MB external flash memory interfaced through spi. I was trying to upgrade the firmware of my st controller using ...
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0answers
126 views
Which pins are required when reading and writing NAND flash?
I plan on reading and probably writing NAND flash on some embedded devices or USB flash drives.
I did not come across many examples for in circuit reading though I'd give that a try at first if ...
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2answers
213 views
Can I lower flash power consumption by pre-flashing all values to high?
I am designing an embedded system that will use either embedded flash memory or an SD card.
The system must survive without much power and the estimated 30mA draw of an SD card sounds too high for me.
...
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2answers
133 views
Does the logic inside flash memory devices require a power down after each WRITE operation? [closed]
Does the logic inside flash memory devices require a power down after each WRITE operation?
I was confused when reading the datasheet of the Micron Serial NOR Flash Memory.
There is "To avoid data ...
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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
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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....
0
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1answer
41 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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0answers
181 views
Flash memory programming failure
I'm working on an XScale PXA270 with NOR Flash on Chip select 0.
Due to the obsolescence of the previous flash, my company changed it for an AMD/Spansion compatible MX29GL128.
I'm trying to write on ...
0
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1answer
762 views
STM32F103 SPI MISO doesn't work as expected
In one of my small projects I use STMF103C8T6 as MCU and SPI memory W25Q128 of Winbond to store a data. The memory chip connected to SPI1. Here is a part of the scheme:
The code is mostly generated ...
0
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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 ...
0
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3answers
138 views
W25Q80: Data Loss
Today I've faced a strange problem:
I have an LCD monitor controller board. It has an LCD panel driver chip having a 8051-based MCU inside, but the chip needs an external W25Q80 SPI flash for ...
1
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2answers
574 views
How to secure an EMMC
My department of the company I am working at is in charge of developing a circuit for production, and security in the embedded system is a crucial requirement. The current prototype of our embedded ...
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0answers
64 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 ...
0
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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
71 views
Similarities between flash memory and a camera flash?
This story is repeated in a number of places. What about flash memory would have reminded him of a camera flash?
The name “flash” was suggested by Dr. Masuoka's colleague, Mr. Shoji Ariizumi, ...
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2answers
3k views
Why are NOR flashes still used when NAND flashes have a bigger size?
I've seen a few systems that uses a NOR flash to boot from, and a NAND for a bigger filesystem. I've also seen a system with only NAND gets corrupted after files being written to and verified correct.
...
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1answer
192 views
On NAND or NOR flash, is program time completely independent of byte values?
I know that the erase value of NAND and NOR cells is all 1s, and the process of programming involves clearing bits. Is the program time of some x length data always the same, regardless of the number ...
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2answers
154 views
What are the purpose of voltage doublers in flash memories?
I'm wondering what is the need for charge pumps in flash memories.
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0answers
1k views
Does NOR flash have better life span than NAND?
I wanted to know which one has better life span, NAND or NOR flash and what is the reason? By life span I mean the number of erase cycles allowed per block.
I read in the link https://en.wikipedia....
10
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1answer
610 views
Can you program a surface mount IC with flash memory and then reflow solder them?
I know that many chips, such as the ATMEGA328P-AU list flash storage lifetimes at certain temperatures, but they usually cap out at 100° C.
I know that, ideally, one should include leads on their ...
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votes
2answers
3k views
What does “32KB (16K x 16)” mean? [duplicate]
On digikey site program memory for ATMEGA328P-AU-ND is shown as 32KB (16K x 16). in ATMEGA328P datasheet program memory is 32KB but what does (16K x 16) mean?
Other Examples are :
16K x 8
64 x 16
...
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1answer
140 views
Configuration settings for programming flash memory
I need to specify a memory addresses settings in the configuration file for programming flash memory with Macraigor Flash programmer utility. The device is BCM3360 (MIPS32) chip and flash memory is ...
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0answers
349 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:
...
0
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1answer
142 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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vote
1answer
2k views
What type of FLASH (NAND or NOR) is used on microcontoller? [closed]
I am doing a study on file systems for mcirocontollers (MCU), using internal flash only. I find my self asking this questions: What type of FLASH memory is used most commonly in MCU ? NAND or NOR?
...
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votes
2answers
493 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 ...
2
votes
2answers
567 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 ...
0
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2answers
441 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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5answers
12k views
where are constant variables stored in microcontroller?
As per the memory layout of C program ,constant variables are stored in the Initialized data segment of the RAM. But as per some of the Microcontroller memory layout ,const variables are stored in ...
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1answer
276 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 ...
3
votes
2answers
4k views
SD card detect in SPI mode
Just wondering if it is possible to detect the presence of an SD card when it is being used in SPI Mode?
It would appear that the card detect/data 3 pin (CD/DAT3) is used as a chip select (CS) pin ...
0
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2answers
752 views
How to store 8 bit character in 32 bit Data Flash memory?
Is it possible to store 8 bit character to 32 bit Internal Data Flash in the Microcontroller by just using only 8 bit of space for each bytes?,by using a combination of 4 bytes which can be also ...
