Questions tagged [memory]

Consider instead more specific tags, e.g., dram, sram, flash

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1answer
250 views

How to write data to this dataflash memory

I'm trying to write data to a W25P80 dataflash memory using an mbed. The documentation says there is a read data instruction for reading data from a section of memory by sending the opcode 03h ...
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1answer
7k views

How to read the device ID of a dataflash memory

I am trying to read the device ID of a serial flash memory by using the SPI connections on an mbed. In the datasheet for the serial flash memory W25Q80 there is this figure. The following is the code ...
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1answer
104 views

Are there datasheets for this dataflash memory?

It's hard to read what is written on this dataflash memory but it looks like 25p80vg. I searched for datasheets and found some things similar to it, but couldn't find anything that matched it exactly. ...
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1answer
199 views

How to read this table in a datasheet

I'm trying to get the device ID out of dataflash memory using an mbed. I'm trying to understand this table that is in the documentation for the memory. I understand that ABh, 90h, and 9Fh are the ...
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2answers
137 views

How is the board connected to this chip?

I have a dataflash memory that is too small to fit on a prototype board, so it has been put on a small board. I am having trouble figuring out where pin 1 is on this board. Below is a picture of the ...
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3answers
297 views

This flash memory works without connection to a power source or gnd?

I am doing a project where I need to store information into flash memory and read it back using an mbed. I can't get it to work right, but I noticed that even if there is no connection to power or ...
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2answers
253 views

Advice on suitable SRAM

I'm kind of new to all this and the choices out there is kind of overwhelming when it comes to selecting a SRAM package and Flash eprom to go with a 10 Mhz Z80180. I'm looking for a 128 KB SRAM and a ...
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7answers
14k views

Use of malloc in PIC

How can I use malloc() and free() functions in a PIC? I've checked the stdlib.h header and ...
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4answers
1k views

Can MCU memory be subject to bit errors and failures?

One of my older prototypes for Super OSD always had one little bug. A single pixel in the video, about midway in the frame would always be off. It did not really affect anything as most pixels ...
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2answers
135 views

Where can I find good documentation about memories?

I'm learning about the different kinds and functionalities of electronic memories (i.e. RAM, flash, etc) but I'm a little confused because all the sources show something different and I don't know ...
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3answers
1k views

PIC18 Memory Management

The limited stack size of budget PICs is a problem area and I have adjusted my code to accommodate this reality. I currently adopt a rough paradigm of grouping closely related functions into a module ...
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4answers
228 views

High density serial interface nonvolatile memory

I'm looking for a high density (>512Mbyte) FLASH or other memory device in a small package with a serial interface. I'm hopeful but I can only find sizes up to around 16 MB with serial interfaces. ...
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5answers
5k views

SRAM which two chips can read/write

I'm looking for a small, 32KB or so SRAM device that two MCUs can read or write (at two different times; I don't need simultaneous reading/writing.) It would be good if it used a serial interface as ...
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3answers
407 views

Rewriting DataFlash pages

Atmel recommends: "if the reprogram operations occur in a random fashion in which any number of pages is updated in a random order, then the system must ensure that each page of the Serial ...
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5answers
2k views

Memory suggestions for MSP430

I'm developing a measurement application with the TI MSP430 and I would like to hear some suggestions on what type of memory I can use. The idea is to use it for logging during a certain time and ...
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4answers
19k views

What is a good choice for an ARM to interface with external memory?

I just completed a project using the LPC2132 chip, but ran into problems with using up the whole 64kb of RAM. For my next project, I'd like to use something that can reference an external, much ...
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2answers
1k views

ATA Interface for PIC

I've been considering using a NANDrive by SST in a new design, however I wasn't sure how complicated it would be to connect a PIC to the ATA interface on the NANDrive. I did a quick Google search and ...
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6answers
1k views

Write Once Memory

I've seen news articles talking about how SanDisk released Write Once Read Many (WORM) SD cards, but I can't find anywhere to buy them! I'm thinking of building a project where I'll want to write ...
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6answers
2k views

SDHC card, a microSD shield, and Arduino Duemilanove

I got a new microSD shield from LittleBird and am having some troubles with it. I downloaded the sample library that it said to used, threw in a microSD card and expected it to work... It won't ...
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6answers
13k views

DIY USB Mass Storage Tutorial

I was just wondering if there was a tutorial anywhere on how to make your own USB Flash Drive and I don't mean take apart a USB and put the guts into something else, I mean put together the flash ...
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3answers
582 views

Book on memory from hardware perspective? [closed]

Is there a good book that talks about memory (SDRAM, DDR, NVRAM, flash etc) from a hardware/system perspective? Most of what I've been able to find deal with memory at the transistor level. I am ...
7
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1answer
2k views

ATTiny2313 ISR stack usage

I'm using an ATTiny2313 to act as a serial concentrator. It only has 128bytes of RAM. I think I'm running out of RAM during the ISR. My question is how much RAM (stack) does an ISR use to save the ...
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7answers
7k views

Saving data to an SD card memory module using an Arduino

Is it possible to save data from the Arduino to an SD card memory module?

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