Memory which maintains it's value through power cycles.

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0
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2answers
93 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 ...
0
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0answers
37 views

Counter that keeps state when power is lost

I am looking for thoughts on implementing a counter that has the following simple interface: each time the READ pin is asserted, the 96 output pins are driven. the output pins are set to a ...
0
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1answer
50 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 ...
1
vote
1answer
69 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 ...
2
votes
1answer
95 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 ...
2
votes
2answers
525 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. ...
2
votes
1answer
132 views

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 ...
0
votes
1answer
49 views

How do I store analog input into the msp430 nonvolatile memory?

I am using Energia to program MSP430G2553 chip in a BristleBot circuit and I would like to store data in the nonvolatile memory, so next time I turn it on it remembers the inputs. How do I define this ...
0
votes
1answer
27 views

What is the type of memory of a USB Flash drive and on a hard disc?

I know there are different types of memory such as ROMs,DRAMs,SRAMs,etc. I don't understand what is the type of memory on USB Flash drives that we use so often and on the hard disc of a PC. Can you ...
0
votes
1answer
28 views

What does Fujitsu call an “RFID LSI”?

Fujitsu offers ferroelectric RAM modules, including in "RFID LSI" format. I have no idea what those are, and the engrish documentation doesn't help at all.
0
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1answer
44 views

Choosing components to clone ZX80

I have an idee fixe to make a clone of Sinclair's ZX80 computer. So now I'm trying to find out which ICs I need for the basic prototype - and here are a few questions: it seems ...
1
vote
2answers
92 views

Why fram instead of eeprom

Why do all the gameboy cartridge mods for nonvolatile save use a type of ram like fram? Why isn't a sufficiently fast eeprom or flash ic used? EDIT: We all know this is about parallel interface ICs, ...
2
votes
1answer
161 views

Floating Vdd; NV Pokemon saves [closed]

http://forums.benheck.com/viewtopic.php?f=18&t=38664 In the link, there is a thread discussing replacing gen 1&2 Pokemon cart sram ICs with fram equivalents. The only differences between old ...
-1
votes
2answers
160 views

Which is the best memory option to store about 8MB of sensor data? [closed]

I'm preparing a data logger with some sensors. I want to store that data to a memory. It should store data for a continues period of 2 days. I need atleast 8MB. Here I'm using STM32L053 for my ...
0
votes
3answers
193 views

Why use RAM IC over EEPROM IC?

I have been looking at various different external storage ICs that would work with an arduino. When I looked at the specs of some EEPROM chips and compared it to the specs of other RAM chips, I ...
0
votes
1answer
80 views

Do CPLD devices lose non-volatile memory over long periods of time?

I have devices that use Xilinx XC9572XL CPLDs. They haven't been used (as in: not powered at all) for almost seven years, and symptoms would point to the CPLDs being at fault. I couldn't find much on ...
2
votes
0answers
324 views

STM32 Flash acting like RAM

I've been trying to program a word of flash memory on my STM32F030F4, but for some reason whenever I power it off and on again, the memory location has defaulted to '0xFFFFFFFF' again. Am I missing ...
1
vote
1answer
35 views

Modifying memory of an integrated circuit

The integrated circuits of EMV-chips (normal credit cards) claim that their memory is physically protected, is it possible to make an integrated circuit in which the memory can only be modified and ...
0
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1answer
42 views

F-RAM Read Operation Data Loss

I have a question regarding F-RAM I will be using the Cypress FM16W08 as an example. Here is a link to the datasheet: http://www.cypress.com/file/41731/download I have recently used it as a drop in ...
6
votes
4answers
485 views

Why do most of the non-volatile memories have logical 1 as the default state?

I have used non volatile memory, like EEPROM and FLASH memory, in embedded applications and I have always found that unused memory (EEPROM/FLASH) bit locations are always set to ...
0
votes
1answer
1k views

What is a Namespace in SSD?

What is a namespace in NAND or NOR based Flash Memory? Is it a range of addresses of NVM? If yes, then is it specified by SSD Manufacturer?
12
votes
4answers
3k views

Does a USB mouse have memory that could be used to store malware?

I worry that this might get flagged as too broad, but here it goes: Lately I've been thinking about the possibility of loading data on peripheral devices. One of the most used peripherals is the ...
2
votes
1answer
149 views

Will reading serial flash memory wear it out?

I know that a flash memory has limited write cycles. Does it also have limited read cycles? Datasheets of most serial flash memories (like SST25VF series) mention endurance cycles. Does this ...
1
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1answer
79 views

How do simple low power devices store setup when switched off?

I often come across battery powered items that store their state when switched off, particularly 'simple' items like LED bicycle lights (e.g. flash or solid light, changing each time it is switched ...
2
votes
3answers
4k views

STM32 SPI Peripheral bug?

I'm using STM32F051R8T6 on STM32F0-Discovery board and M25P80 flash IC as a peripheral. I've got the SPI configured in 3-line (+ 1 software chip select line), full-duplex mode and I'm using polling to ...
3
votes
2answers
676 views

EEPROM Write Cycle Time and Write Cycle Endurance

I have an embedded software application that is copying a buffer from RAM to EEPROM. In this case, the EPROM device is a 28C010 (128K x 8). The copying is done at non-regular intervals, generally in ...
1
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1answer
161 views

Running a Microcontroller with Selectable Voltage (3.3V/5V)

I'm working on a non-volatile SPI memory chip programmer. My design sends individual data bytes over USB to an MCP2200 (USB to serial converter chip), then the serial data is sent to an ATMega48, ...
0
votes
2answers
671 views

EEPROM Reading/Writing without Use of Programmer

I am designing a small password based door lock project which is fully made from logic gates and ICs without the use of any sort of programmable devices(it is a simple university project for the Logic ...
0
votes
1answer
122 views

How many NAND flash chips (measured in Gb) are required for a 32GB USB drive? What is the economic relationship between the two?

NAND Flash Contract Price http://www.insye.com/dp/NANDFlashContractPrice.aspx Context, I am purchasing about 200k USB drives. I sent it out to competitive bid but I want greater insight into the BOM ...
0
votes
1answer
176 views

NAND flash program/erase cycles

Recently I have gotten myself in to buying USB flash drives in order to back up some of my data, however once I got into the detailed specs of the consumer flash drives I have gotten worried, about ...
1
vote
1answer
967 views

STM32F429 / STM32F439 read-while-write from two memory banks. Prevents stalling CPU?

I have been reading up on the STM32F429 flash memory (2MB version). From the STM32F4 reference manual I found out that it has two memory banks and supports read-while-write (RWW), which means it can ...
0
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1answer
436 views

Flash memory range on STM32F429II

I am reading the STM32F429II data sheet and looking at page 84, which shows the memory mapping. The chip has 2MB of internal flash memory, but the data sheet is general for all STM32F427xx/STM32F429xx ...
0
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2answers
120 views

Flash Memory Failure Modes - Block Failure [closed]

My understanding is that typical flash memory failures, such as those due to erase cycles, occur at the bit level. I have a flash in which entire blocks (actually two blocks) are failing. Is there a ...
2
votes
1answer
328 views

AVR program code location

I'm working with an ATmega328P and I wanted to interface with the flash memory writing data to it with the macros provided by avr-libc. This is the memory map for my chip: I don't understand where ...
2
votes
1answer
180 views

EEPROM Write Limit [duplicate]

Just curious as to why do non volatile memories like EEPROM in an AVR have a write limit ? Also is this limit per location/adress in the memory or on the memory as a whole ?
1
vote
2answers
322 views

Easy way to tell if a low power MCU supports external memory?

Please forgive my ignorance, as am very new to this. I am looking to build a custom PCB and have found several low-power modules with internal MCUs. Is there an easy/quick way to determine whether ...
3
votes
3answers
250 views

What sort of a ferrite core will I need to make core memory?

I am building a homebrew computer using core memory. What sort of a ferrite core will I need?
1
vote
1answer
4k views

Storing settings/data on microcontrollers non-volatile memory (STM32F103)

I want to be able to store values in a non-volatile memory so that the microcontroller can load these settings at start up. These settings might change at run-time and it is important for the systems ...
7
votes
2answers
2k views

Why must flash memory be written/erased in pages/blocks ?

Title says it all. I'm trying to understand the workings of flash memory technologies, at the transistor level. After quite some research, I got good intuitions about floating-gate transistors, and ...
0
votes
1answer
160 views

What is the Global Descriptor Table memory type?

What type of memory type is used for the Global Descriptor Table in an Intel Core 2 CPU? Is it just EEPROM or does the CPU normally use another type of NVRAM?
2
votes
2answers
224 views

High capacity flash memory

I'm trying to find a suitable high capacity (4-16GB) memory for an embedded application. Clearly this is going to be some kind of NAND flash memory. I need to be able to write to it at at least ...
2
votes
2answers
4k views

Differences, uses, and theory of volatile and nonvolatile memory?

I understand the basics of volatile and nonvolatile memory. Volatile memory requires a constant power supply to retain data whereas non-volatile memory does not require a constant power supply to ...
1
vote
1answer
724 views

How data 0xFF is stored in Flash memory?

Hi i am using SST25VF032B flash memory. Before writing ,it has to be erased to 0xFF. But my doubt is that how it stores real 0xFF. Will is store 0xFF or some other value?
10
votes
7answers
7k views

I2C slave address not acknowledged (sometimes)

I'm trying to communicate with a remotely connected FRAM (FM24C04 from Ramtron) by using I2C. This memory is embedded on a board that can be inserted and removed at any time to/from the system ...
1
vote
1answer
523 views

Some general NAND flash questions

I have some questions about nand memories. Do we need to erase whole block to rewrite only one page? If true, what is the algorithm? Cache whole block > edit one page > erase whole block > write ...
1
vote
1answer
61 views

NVSRAM - Storage Capacitor Selection

I was reading this document from cypress website on Various storage capacitor options for nvSRAM. In page 2 , under the heading 'key characteristics' (see link below), I came across various values for ...
0
votes
1answer
336 views

About leakage current, standby current and current budgeting

Am using ST microelectronics NAND Flash device NAND01GW3A0AN6E. In this datasheet under Dc characteristics table they specified leakage current,standby current,operating current parameters. What is ...
8
votes
7answers
1k views

Alternatives to using EEPROM

As I understand it, EEPROM is a part of a computer (in my case, an AVR microcontroller) which stores data, and holds on to it even when the device completely shuts down. It allows data to be written ...
24
votes
3answers
4k views

What's the catch with FRAM?

After recently acquiring an MSP430 Launchpad I've been playing with various microcontroller projects. Unfortunately, the MSP430G2553 only has 512 bytes of RAM, so doing anything complex requires ...
1
vote
1answer
205 views

How to erase stored data in MRAM memory devices

When searching in Google about MRAM I was only able to find the reading and writing process for MRAM. How does erasing happen in MRAM? Also why there is no need of error correction and checking ...