Read-and-write memory, Electrical Engineering

Q. Read-and-write memory?

Writing is the same as storing data intomemory and reading is the same as retrieving the data later. RAM is said to be volatile because its contents are retained only as long as power is present. A RAM device is a collection of 2n addressable storage locations, each of which contains k bits. Its block diagram is shown in Figure, in which each cell may be a flip-flop or a capacitor, and n address lines are decoded to select k cells. A static RAM, in which each cell is a flip-flop, is the read-and-write memory that retains its data so long as the power is applied, without any further action needed from the computer. Static RAMis used in microprocessor-based systems requiring small memory. Common static-RAMsizes are 2K × 8, 8K × 8, and 32K × 8, where K stands for 210 = 1024. A dynamic RAM, in which each cell is a capacitor (which leaks charges and therefore requires continuous refreshing from the computer to maintain its value), is the read-and-write memory that is used in large memory systems due to its lower cost and greater density. Common dynamic-RAMpackages are available in 16K-bit, 64K-bit, 256K-bit, and 1M-bit (whereMstands for mega = 220 ) sizes.

2051_Read-and-write memory.png

Posted Date: 6/25/2013 5:23:14 AM | Location : United States







Related Discussions:- Read-and-write memory, Assignment Help, Ask Question on Read-and-write memory, Get Answer, Expert's Help, Read-and-write memory Discussions

Write discussion on Read-and-write memory
Your posts are moderated
Related Questions
Single Phase Full Wave Controlled rectifier The single  phase  half  wave controlled  rectifier  produce only one pulse  of load  current  during  one cycle  of supply voltage

Q. A 5-kVA, 480:120-V, two-winding, 60-Hz, single-phase transformer has an efficiency of 95% while delivering rated load at rated voltage and 0.8 power factor lagging. This transfo

Discuss classification of conducting materials into low resistivity and high resistivity materials. Conducting materials are categorized as low resistivity materials and high r

Multiprocessing - Many Processors Many users Many Programs  Multiprocessing or also  called  distributed processing system  provides solution to problems of above  timesharing

svd calculation in matrix

Q. Explain working of three-phase transformers? Transformation in three-phase systems can be accomplished in either of two ways: (1) connecting three identical single-phase tra

Three equal impedances of D ohms resistance and C inductive reactance are connected in a DELTA configuration. The line voltage is A00 volts. Determine the line current, phase cur

A coil of inductance 0.04 H and resistance 10? is connected to a 120 V, d.c. supply. Verify (a)  The final value of current     (b)  The time constant of the circuit (c)

Description of Capacitor r A capacitor has capacitance of one Farad when current charging of one Ampere flows in one second. This process causing a transferring of one volt in p

Programming languages As we  have seen  the evolution of computer  hardware  similarly  programming  languages also  have their  history  of development from  machine  language