Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
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.
There are innumerable caveats to this answer, but basically any Webpage containing a form will need a CGI script or program to process the form inputs.
8085 the interrupts are classified as Software and Hardware interrupts.
Currently microcontrollers are embedded within most products, typical uses are in Camera's for auto focus and display drivers, Laser printers to compute fonts and control printing.
Question 1 What is modulation? Explain why is modulation required? 2 Briefly explain about ASK, FSK and PSK 3 Explain about the Nyquist Bandwidth and Nyquist Theorem 4
Describe the additional characteristics needed for an e-commerce server? E-commerce services need dynamic configuration abilities and seasonal and every day service configurat
Fetching a word from memory: CPU transfers the address of the needed information word to the memory address register (MAR). Address of the needed word is transferred to the pr
Memory utilization factor shall be computed as? Ans. memory in use/total memory connected.
How are switching system classified
Micro-Operations A micro-operation is an basic operation which is performed on data stored in registers. We can classify micro-operations into four categories: 1. Register t
The effect of tree supply on death rate depends upon a ratio comparing the number of trees that are actually available per person per year to the desired number of trees per pers
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd