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

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2answers
48 views

Is this address decoding circuit correct?

The problem is to design an address decoding circuit for two 4Kx8 RAM chips at the 2050H . We have 16 address lines. So, for 4Kx8 RAM we need 12 address lines to address the memory. Remaining can be ...
0
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4answers
52 views

What is the need for precharging in SRAM/ DRAM memory cell?

Why is precharging so necessary while preforming read operation on SRAM/ DRAM cells? For example in the SRAM 6T cell shown below, Reading 0 requires bit line to discharge to 0; Reading 1 requires ...
4
votes
2answers
335 views

Is this BRAM being fully utilized if I use a different data width?

Background I am using a Xilinx FPGA from the Kintek-7 family. The documentation for the memory resources can be found here. Here are some important excerpts from the document (referencing pages 11 ...
1
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2answers
80 views

Need understanding of the concept of word (memory)

I've been reading how memory works from a book. The problem is my weak english so I can't catch the meaning correctly. The text from the book : A computer with a 32-bit word has 4 bytes/word, ...
1
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5answers
128 views

Undeletable EEPROM or other storage for micocontrollers?

Is there such thing as permanent EEPROM storage? The data written should be un-deletable. Once written it should be there as long as the chip is not destroyed or damaged. Any other alternatives to ...
2
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0answers
58 views

Flash memory : What are blocks and pages from a physical standpoint?

I would like to know the link between the physical layout of NOR and NAND flash cells and the concept of blocks and pages. I would also like to know the exact reason for why erasure only happens in ...
1
vote
1answer
75 views

Reseting a 128 adress* 16 words memory

I'm doing my term project, in which I have a memory, which can be changed by the user. The specification is that whenever reset is activated, data on this register should be reset to all zeros. I ...
4
votes
3answers
100 views

Is it safe to define a memory section over multiple physical memories?

I am working on the memory mapping on my MCU. Let's say I have this mapping for physical for memories: 0x1000 RAM 0 0x2000 RAM 1 0x3000 Then I have ...
1
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1answer
51 views

Cache memory vs shadow RAM

I know that cache memory is much faster than typical RAMs. Apart from that, what exactly is the difference between Cache memory and shadow RAM? Both of them will have data that are to be accessed ...
0
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0answers
48 views

EEPROM vs NOR Flash [duplicate]

I came to know that EEPROM of these days are nothing but NOR Flash. How true is this statement? In case if it is true, why is still there a distinction between flash and EEPROM when we talk of memory ...
2
votes
1answer
79 views

What is the more frequent error in DDR Memory?

this is about DDR memory data corruption and not about STUCK address or data lines. If we have a good DDR with no memory stuck issues and we perform lots of writes and reads which type of error is ...
-3
votes
1answer
67 views

Does a DDR RAM device exist which would allow RAM to be removed and preserved? [closed]

Hello I would like to know if there any device which could preserve content of RAM once removed from a host system and this special device could be connected perhaps by way of USB to another machine ...
1
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1answer
51 views

“Stacked” NAND flash memory; 2 chips on a single circuit?

Sorry if this is a stupid question, I'm a newbie just getting into the actual hardware side of things. Obviously I'm starting small, just a simple re-balling of a BGA chip to build my own Single ...
0
votes
2answers
210 views

Where is data coming from a bus stored in a microcontroller?

It might sound like a silly question, but somehow I am not able to answer this myself with confidence. Let's say we have a microcontroller (MCU) with a data/address bus and data is moving to and from ...
11
votes
3answers
2k views

What resides in the different memory types of a microcontroller?

There are different memory segments to which various types of data are put into from C code after compilation. I.e: .text, .data,...
0
votes
2answers
56 views

Understanding pull-up resistors and the 7489 memory chip

I have been learning about the 7489 memory chip. I had two of these that turned out to be broken (see here for previous question on this). I got more and I have finally gotten everything to work. ...
-2
votes
1answer
75 views

How does information gets stored into EEPROM?

How does information gets physically written to an Arduino Uno EEPROM ? Is each bit of information in fact a small condensator which fills and retains its charge even when the Arduino is powered down ?...
0
votes
1answer
69 views

does this ensure i am reading from the ram?

I at the moment trying to reverse engineer something i made a long time ago but never understood why it is running so slowly. I have a Zybo board, with an Zynq 7010s chip ons which has dual cortex-...
0
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0answers
46 views

Where is the variable stored?

I at the moment programming on a Zybo board, which has a Zynq chip on it, which tightly integrates a dual arm processore with an FPGA. I an on the Arm implemented a game which stores the game image ...
0
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2answers
75 views

Why are two LEDs on? is 7489 broken?

This is a follow up question to this question. I have attempted to draw a schematics of my setup for the 7489 below. Without the switch closed, the LED D1 is on. Then the switch is closed, then also ...
0
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2answers
85 views

Schematics for using IC 7489 memory

I bought two SN7489 because I wanted to learn how the memory chip works. I followed the datasheet. I don't seem to be able to get it to work. After playing around for some time with the IC, it got ...
0
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1answer
35 views

Baseband Processor

If a device can only be activated by way of RF then I would tend to believe that the BB processor (embedded via ASIC design) would need to be active and powered on yes ? If correct then does it have ...
1
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1answer
64 views

A simple memory chip

I think I understand how one can use an Arduino to program an external EEPROM memory chip. I am wondering if there are any memory chips that don't need any type of micro controller to operate. So, for ...
-3
votes
4answers
97 views

Shouldn't all the NAND gates in your computer activate at the same time? [closed]

When you plug in your computer, shouldn't all the NAND gates activate (because the output turns on when the both inputs are off) at the same time, causing chaos? For example: RAM is made of memory ...
0
votes
2answers
108 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 ...
1
vote
2answers
68 views

How do SRAM bit line “gates” work?

I'm currently learning about the operation of 6 transistor static random access memory cells and I've hit a wall in understanding exactly how the read/write operations work. More specifically I don't ...
0
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0answers
79 views

Memory Interface with a Multiplexed Address/Data Bus

I want to implement a memory interface in VHDL between an FPGA and a processor. The address/data bus is a 16-bit multiplexed bus with an ALE, write protect and BusWait. According to the NVIDIA Tegra 3 ...
0
votes
2answers
77 views

Adding to a circuit the ability to “remember” the last chosen settings when turned off or disconnected

If you could please bear with me: I'm just starting out in electronics and I've had an idea for a nice experimental mod that will also be useful. I've recently bought a pretty cool little 8 x 8 LED ...
1
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1answer
50 views

conventions in signals naming in datasheets

What does it mean when the datasheets lists the signals between parentheses as shown in the figure below?
0
votes
1answer
197 views

DDRx Memory: Memory Clock vs I/O Bus Clock?

When referring to DDR/DDR2/DDR3/DDR4 memories, I am not able to understand the difference between memory clock and I/O clock. As per: https://en.wikipedia.org/wiki/Double_data_rate DDR-200 - Memory ...
1
vote
1answer
86 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 ...
0
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0answers
43 views

Is it possible to save the “END” address in program memory of 8051 uC inside a register?

I have just started learning 8051. One of the proposed exercises says that "immediately after" the end of the program code inside program memory, there's some data of interest that i should read. For ...
1
vote
1answer
77 views

Is my understanding of D-Flip Flop wrong?

So I am working on: http://www.nand2tetris.org/ and I am having a hard time understanding the D-Flip Flop, or maybe I should say, how Logism represents it. I have this circuit and this is the current ...
1
vote
1answer
51 views

What is traffic generator (while using Xilinx Memory Interface Generator)

I am trying to use the Memory controller Block in my Xilinx Spartan 6 FPGA to set up an interface with LPDDR memory. I read the MCB User guide, and I am quite clear about how it works, and how I would ...
0
votes
4answers
74 views

Best value to overwrite old to tell if memory is not used on eeprom

I have an EEPROM I want to store CRC32 hashes on between 0x0000 and 0x008C. In this range I need a way that I can erase one of the hashes and overwrite its bytes to a default number. By doing this I ...
4
votes
4answers
928 views

What is the densest part of an integrated circuit?

Also, which part of an integrated circuit has been affected by Moore's law most? Is it the memory (caches, embedded memory, etc.)? Or is it the logic (execution units, control units, etc.)? Or ...
1
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0answers
51 views

GDDR Power Calculation

I'm wondering if there is any publicly available documents or research papers that cover GDDR power estimation? Micron provides very nice documentation and calculators for DDR up to DDR4, however I ...
1
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3answers
102 views

How to record input from multiple microphones so there is no latency between microphones due to writing to memory

I am going to be doing some beam forming. I understand the concept and plan to record all the data then analyze the signals from multiple microphones to figure out locations of some noises (there will ...
-2
votes
1answer
90 views

A computer system has RAM of 32K bytes and 64 peripherals. What is the number of distinct addresses required? [closed]

Is it correct to assume that the number of addresses for 32k of ram is 2^15 addresses? Then for the peripherals is it 2^6 addresses?
-3
votes
1answer
77 views

Terabyte memory controller ICs [closed]

I am thinking of creating a PCI-Express card to support from 1TB up to 8Terabytes of RAM (for servers). I will have to modify glibc in order to use it, but it is not a problem. The problem is to make ...
0
votes
1answer
82 views

Fast write/read on NVRAM with Windows

I am trying to find a solution to create a 4MBit NVRAM module (FRAM or SRAM, doesn't matter) with a standard PC with Windows. I want to store up to 1MB of data in less than 1 second with 50-100 write ...
3
votes
1answer
153 views

DDR4 frequency decrease if populated with more than one module per channel

I'm curious how one particular company Gigabyte ensures its server motherboards to run at the maximum supported memory frequency even when there're two or three DIMMs per channel (of coure we're ...
1
vote
3answers
319 views

Is cache memory unnecessary in microcontrollers?

Do we use cache memory in microcontrollers, if not, why not? If yes, what is its application in embedded systems or it is enough just to have RAM?
3
votes
1answer
70 views

Memory Power Supply

Kindly any one give the clarification on this. While going through a DDR Memory data sheet, I have found two (more than that) power supply pins. What is the necessity of this DLL power supply ...
0
votes
2answers
205 views

What is the main difference between SRAM and DRAM in the automotive industry? [closed]

What are the main differences between SRAM(static RAM) and DRAM(dynamic RAM) in the automotive industry? What kind of memory does the different ECUs use? I'm interested in the BCM(body control ...
0
votes
0answers
50 views

Index in block ram is offset by one from position of write

I am having an issue with block ram I am using to create a table to powers of a 64 bit floating point number. I store powers between x^1600 and x^-1600. For some reason when I try to read the table ...
9
votes
6answers
932 views

memory for the simplest possible computer (Pi0K)

I'd like to build the simplest possible computer. I don't care about speed or storage, indeed having slow speed and low storage is a huge advantage as I want to build it out of transistors (ideally ...
1
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0answers
83 views

Best device to read/write memory on multiple architectures?

tl;dr: I want to read/write memory from a PIC MCU and an EEPROM, both of which are soldered to an experiment board. I would like to explore programming and debugging ARM in the near future. Which ...
1
vote
3answers
56 views

Microcontroller Memory reliability : Info Memory vs External Flash

I had a small query which I couldnt find a short answer in google. for storing small amount of data ( say 8 bytes ) in an embedded system (containing an external Flash too), is it preferred to store ...
0
votes
3answers
212 views

Power of a microcontroller, but with more memory - what fulfils this need? [closed]

I'm a hobbyist with little experience. Usually I play with Arduino Pro Mini or ESP8266. I can make them do simple things I want, but for obvious reasons I can't give them too many features at once. E....