What is dynamic random access memory, Computer Engineering

Assignment Help:

Q. What is Dynamic Random Access Memory?

RAM technology is divided into 2 technologies: Static and dynamic. A dynamic RAM (DRAM) is made with cells which store data as charge on capacitors. Absence or presence of charge on capacitor is interpreted as binary 1 or 0. Since capacitors have a natural tendency to discharge, dynamic RAM needs periodic charge refreshing to maintain data storage. Term dynamic corresponds to this tendency of stored charge to leak away even with power continuously applied.

Figure below is a typical DRAM structure for an individual cell which stores one bit. The address line is activated when bit value from this cell is to be read or written.  Transistor acts as a switch which is closed (allowing current to flow) if a voltage is applied to address line and open (no current flows) if no voltage is present on address line.

2157_What is Dynamic Random Access Memory.png

For write operation a voltage signal is applied to bit line; a high voltage represents 1 and a low voltage represents 0.  A signal is then applied to address line allowing a charge to be transferred to capacitor. 

For read operation when address line is selected transistor turns on and charge stored on capacitor is fed out onto a bit line and to the sense amplifier. Sense amplifier compares capacitor voltage to a reference value and decides if cell contains logic 1 or logic 0.  The read out from cell discharges the capacitor that should be restored to complete operation. 

Even though the DRAM cell is used to store a single bit (0 or 1) it is necessary an analog device. Capacitor can store any charge value within a range. A threshold value determines whether charge is interpreted as 1 or 0.


Related Discussions:- What is dynamic random access memory

Example of unification, Example of Unification: Let now here, assume i...

Example of Unification: Let now here, assume instead that we had these two sentences as:  knows(john,X) → hates(john, X)  knows(jack, mary)  Thus here the predicate n

Need of cisc cpu - computer architecture, Need of CISC CPU -  computer arc...

Need of CISC CPU -  computer architecture: Why is Intel spending money and time to manufacture the Pentium II and the Pentium III? The answer of this question is simple, ba

Presentation of the report, This will be based on presentation of the repor...

This will be based on presentation of the report, complexity of the task, degree of completion and uniqueness of your problem.  As a part of this question, you should also inclu

Name the memory used in microprocessor systems, Name the fundamental kinds ...

Name the fundamental kinds of memory used in microprocessor systems There are three fundamental kinds of memory used in microprocessor systems - generallyknown asRAM, ROM, and

Describe types of complements, Q. Describe types of complements? There ...

Q. Describe types of complements? There are two kinds of complements for a number of base (also known as radix) r. These are known as r's complement and (r- 1)'s complement. Fo

Cache memories - computer architecture, Cache Memories - computer architect...

Cache Memories - computer architecture: Speed of the primary memory is very low in comparison with the speed of processor For well performance, the processor can't spend

Find out data changing from special code to temporal code, Data can be chan...

Data can be changed from special code to temporal code by using ? Ans. By using Shift Registers data can be changed from special code to temporal code. A Register wherein data ge

Illustrate shift micro-operations, Q. Illustrate Shift Micro-operations? ...

Q. Illustrate Shift Micro-operations? Shift is a valuable operation that can be used for serial transfer of data. These operations can also be used along with other (arithmetic

Instruction set architecture - assembly language, Instruction Set Architect...

Instruction Set Architecture (ISA): The Instruction Set Architecture (ISA) is the part of the processor which is noticeable to the compiler writer or programmer. The ISA serve

Ruby, Discuss anout variables and assignment statements in ruby

Discuss anout variables and assignment statements in ruby

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd