Questions tagged [memory]

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

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Use MicroSD to SD adapter for read Memory Stick Micro M2

While searching in my personal affairs I found a Memory Stick Micro M2 (Sony) which I believe I was using in a phone. Unfortunately I no longer have the adapter ...
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1answer
32 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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60 views

Why do block RAMs have synchronous reading instead of async reading?

I'm programming FPGA boards (Artix 7 to be exact) and I recently noticed that, in order to be synthesized into block RAM, an array of storage must have synchronous reading, otherwise it will only be ...
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1answer
64 views

Beginner trying to learn how to read start and end addresses for memory chips in hexadecimal

I'm new to electrical (construction management student) and am trying to learn how to read start and end addresses. The practice problem I have been given is in the picture, and I was wondering how I ...
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2answers
60 views

Last address of program in STM32 HAL?

Is there a way to find the last address or last page of the program which is stored in an STM32(F1) using a HAL (or LL?) function? Background: I'm using EEPROM emulation in Flash and this works great....
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What is the relevance of a !Q in the D Flip-Flop when using for a memory module?

If the purpose of this circuit is to store the value of D in Q, why should I need a !Q? Why don't use a circuit like this instead?:
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What is the probability of a bit error occurring in modern computers?

What is the probability of a bit error occuring when reading/writing from/to the latest memory technologies (ssd, hdd, ram) in modern computers? If the same terminology is used in this context as in ...
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2answers
62 views

How do I implement authentication on an embedded device? [closed]

I have been reading a lot about encryption lately but most sources just care about making sure that the connection between two parties is secure. I want to know how I can be sure that the party I am ...
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2answers
116 views

Why does dynamic ram need to be 'refreshed'?

I read this question, but it didn't really answer my question. I also want to preface this question by saying that I'm asking this from the perspective of being a computer science student that took ...
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In Directed-mapped cache, a problem in exercise!

5.2 Caches are important to providing a high-performance memory hierarchy to processors. Below is a list of 32-bit memory address references, given as word addresses. 3, 180, 43, 2, 191, 88, ...
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Sequential circuits and memory

I read some books to understand why we need to memorise bits in electric circuits and found the sequential logic circuits are designed to achieve that goal. The basic element is the SR Latch which ...
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Why are bytes 8 bits? (and more)

An 8 bit value can range anything from 0 to 255 in decimal, or 00 to FF in hexadecimal. But why did they choose 8 bits for the byte, out of all of the powers of 2 they could have chosen? Even still, a ...
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Where the ICM20948 DMP memory is stored?

In Invensense ICM20948 motion sensor they mention The DMP in ICM-20948, therefore, has higher memory for code storage Hence, the AP/MCU must accommodate higher memory required to hold the DMP image ...
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EEPROM converted to DRAM?

Can we use a EEPROM cell for DRAM ? simulate this circuit – Schematic created using CircuitLab This is an EEPROM cell. Can we use multiple cells of this type to create a DRAM?
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DDR4 column width v/s burst size

I'm trying to understand how data is going to fill up a 64bit cacheline with x4 DDR4 DIMM. x4 DDR4 has 16 Banks, 4 Banks each in 4 Bank Groups and each bank is having 4 memory arrays. Burst size is 8....
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The CPU has registers, but doesn't the RAM have registers too?

At low-level, registers are the same as a bunch of flip-flops connected by the same clock, so I would think RAM is made of registers. I've been reading, though, that registers are only in the cpu, ...
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Is there some kind of standard of modbus input register?

As the title said, based on your experience, is there a such thing? If no, which are the most commonly used? for example in a sensor, the input registers as follows: ...
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3-terminals magnetic tunnel junction

I was wondering if a 3 terminals magnetic tunnel junction can be implemented, as in the Figure. On the bottom I have a normal metal (NM), on the top a magnetic junction (FM = ferromagnet) and I can ...
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Devices storing volatile memory

I've hit a bit of a rut in a question on my homework for my computer architecture class (MIPS architecture): what are digital logic devices that can implement 1 bit and 32 bit volatile memory, and ...
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57 views

How x86-64 Intel CPU understands how many bytes load into a register

I have the following byte code one the left and and its byte representation on the right: ...
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1answer
44 views

Decoder inputs needed given 32 registers

I have a couple of questions about decoders. My first is this: If I have a register bank with 32 registers, how many inputs are needed for the decoder and why? I think that you need 5 inputs for this ...
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1answer
52 views

74ls279 SR latch not working

I am trying to get an 74ls279 SR latch to hold a state, but it's not working. I am using a full-size solderless breadboard, a 3V power supply, and an LED to view its state. The LED flickers and loses ...
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Timer IC that doesn't reset count because of power down and remembers last state [closed]

I'm looking for a timer/RTC that will count how long the system power was up in total and will toggle a pin after a specific time that will be configured in advance. Does a timer that "remembers" ...
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75 views

Why cant clock be directly used instead of DQS in DDR during read and write

I have been reading about DDR lately and I am not able to understand the exact use of the DQS signal. The timing diagrams show dqs in phase with clock so why cant the clock only be used for the write ...
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Where can I Find the Memory map and register table for the S70FL01GS

I am currently working with this device: https://www.mouser.com/datasheet/2/100/001-98295_S70FL01GS_1_Gbit_128_Mbyte_3.0V_SPI_Flas-1102682.pdf The datasheet provides some high-level details about ...
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4answers
203 views

Memory Mapped IO and IO Mapped IO

I am revisiting Microcontrollers and Microprocessor concepts. Yes. I know this question has been asked many times like here and here. I have also visited many sites regarding this concept but still I ...
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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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82 views

Why do we need interleaved memory?

I am trying to understand the DRAM working paradigm. I just read this article about interleaved memory. It says: Interleaved memory results in contiguous reads (which are common both in ...
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2answers
115 views

SRAM: Purpose of Upper and Lower Byte Enable when Data Bus is greater than 8-bits?

What is the point of an upper byte and lower byte enable on an SRAM if the data bus is already 16-bits? Is it related to multiplexing? I had always assumed that SRAMs were either designed with either ...
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40 views

Read-only for some masters but read-write for other?

Is it possible that a memory/memory region be read-only for some masters/chip components but read-write for others? It is kind of vague question, but from a conceptual point view would this be ...
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eMMC Jedec Backward Compatibility

I'm working on a new design based on a Xilinx FPGA. I'd like to use some eMMC devices but the FPGA controller supports JEDEC up to 4.51. Nowadays, some eMMC devices are JEDEC 5.0 or 5.1 compliant ...
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124 views

PCB sound memory for toys [closed]

I want to build a toy. The initial build will be a prototype but if the idea 'sells,' I want to build en-masse. For the prototype, as I do not have (beyond what I learnt at Uni) industry experience, ...
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136 views

Amplifier memory distortion application

I've found an article about memory distortion issues in audio analog amplifiers. Available for free here. The author uses in the last configuration a CFP differential input with a cascode of FET ...
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1answer
73 views

Cortex-M3, Code region vs SRAM/RAM

In the ARM Cortex-M3 processor core, the memory map contains: a Code region, SRAM and a RAM. What makes the use of the code region different than the other memories? In addition, what is the nature of ...
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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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Problems with Memory Initialization in Quartus

I have the following code snippet in my VHDL code to initialize a ROM block: ...
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1answer
90 views

Can a memory chip have a certain starting address

In my book there is a question stated: Can a memory chip of capacity 512 KB have the starting address 2B0000h? To me this seems like an incomplete question with a wrong answer in the book. The ...
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1answer
98 views

Diode ROM with decoder and multiplexers

I have this question on my exam I couldn't answer: A diode ROM has been built using a decoder and multiplexers. If A4A3A2A1A0 = 01001, what is D3D2D1D0? Here is the first schematic: The answer is ...
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DDR3 SODIMM slow clock specification

I am considering to design memory controller handling 1GB of the RAM. I did already design controller for Micron's 32MB SDRAM in the past using Cyclone III device. The new design is for retro ...
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89 views

Design this memory with D Flip-Flops

Design the following memory with D Flip-Flops. (you can use other gates or decoder if needed) The following memory has 4 one-bit locations and can access 2 locations in each moment and read from ...
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1answer
70 views

Are Tri-state buffers even necessary?

I'm trying to make a 1-bit computer, and I'm stuck on the registers. I think I am going to have 2 of them, and I want a way to separate their outputs. Let me explain. Let's say Register A has a 0, and ...
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41 views

Temperature and flash corruption in microcontrollers

I'm repairing quite the pricey device, where a strain gauge failed. It's a pressurized device, and the strain gauge measures the internal pressure by means of it. The crux of the matter is that the ...
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2answers
133 views

Memory-mapped IO vs Port-mapped IO in microcontrollers

I've been reading about external peripheral mapping to microcontrollers. I understand that memory-mapped IO means that the same address space in the microcontroller can be used for internal memory ...
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1answer
42 views

What is the delay incurred by ternary content-addressable memory (TCAM)?

What is the cost (in terms of delay) of using TCAM? How do they compare with SRAM and DRAM? I understand their use cases are different. But assume, for an application, I can do an operation using ...
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How is the memory space calculated as 64KB for this MCU memory?

When it is about an 16 bit microcontroller with 16-bit adress 0xFFFF(the largest 16-bit number is 0xFFFF in hex or 65535 in decimal) the following picture is given and total memory space is given as ...
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45 views

DRAM late and early read and write

For read operation in DRAM, perform early read mean OE low before CAS is low so doesn't this mean that you just read in junk data ? For write operation, i don't think there any problem with early ...
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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 ...
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51 views

DRAM Memory Lines

I have been trying to understand DDR and DRAM memories and stumbled upon this video In this video, from 20:00 to 23:00 he tells that the 8kb row buffer lines, actually come out as 64b and this 64b ...
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55 views

What is voltage level in DDR5 defined by JEDEC?

Voltage level in DDR4 is 1.2 volt, will it be same in DRR5 also? Also how much maximum voltage fluctuation will be allowed?
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External Memory IC which increments data on a clock pin

I am searching, with no success, in multiple categories of the external memory IC market for a chip that can do the following: Store 1MB of data of 16-bit data This data is stored at specific ...

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