Sunday, May 31, 2020
09:25 PM (GMT +5)

Go Back   CSS Forums > CSS Compulsory Subjects > General Science & Ability > General Science Notes

Reply Share Thread: Submit Thread to Facebook Facebook     Submit Thread to Twitter Twitter     Submit Thread to Google+ Google+    
LinkBack Thread Tools Search this Thread
Old Monday, May 21, 2012
Farrah Zafar's Avatar
Makhzan-e-Urdu Adab
Medal of Appreciation: Awarded to appreciate member's contribution on forum. (Academic and professional achievements do not make you eligible for this medal) - Issue reason: Diligent Service Medal: Awarded upon completion of 5 years of dedicated services and contribution to the community. - Issue reason:
Join Date: May 2010
Location: امید نگری
Posts: 2,361
Thanks: 2,346
Thanked 4,038 Times in 1,575 Posts
Farrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud ofFarrah Zafar has much to be proud of
Default CPU and its Main Components

CPU stands for Central processing unit.It is also known as microprocessor or processor.A CPU is brain of a computer.It is responsible for all functions and processes.Regarding computing power,the CPU is the most important element of a computer system.The CPU is consisted of thin layers of thousands of transistors.Each transistor receives a set of inputs and produces output.Transistors hold a key role in functioning of CPU as they make computer able to count and perform logical operations which is called processing.It processes the instructions that it collects by decoding the code in programs.Computers use two types of storage: Primary storage and secondary storage. The CPU mainly interacts with primary storage or main memory,referring to it for both instructions and data.

There are four important functions of CPU,

4)Write back

Main Components of CPU:

The main components of CPU help it in performing various functions.The components of a CPU work together, and their making/manufacturing determine the complexity of operations as well as how fast they can be carried out.

The three components of the CPU are following,

1. Arithmetic Logic Unit
2. Control Unit
3. Registers

Arithmetic Logic Unit (ALU)

There is electronic circuitry in arithmetic logic unit which executes all airthmetic and logical operations.Its function is obvious from its name.It performs arithmetic calculations like as addition, subtraction, multiplication and division as well as comparisons.The unit can compare numbers, letters, or special characters.There can be more than one Arithmetic logic unit in a CPU, and these ALUs can also be used for the purpose of maintaining timers that help run the computer.

Control Unit(CU)

There is circuitry in the control unit which uses electrical signals to instruct the whole computer system for carrying out or executing,already stored program instructions.Its name clearly shows that it controls and co-ordinates computer components.It extracts instructions from memory and decodes and executes them.In fact it regulates the flow of information through the processor.In short,it can be said ,this component receives, decodes, stores results and manages execution of data that flows through the CPU. Its communication with both arithmetic unit and memory is inevitable.

Registers/The Memory Unit

Registers are temporary storage areas which are responsible for holding the data that is to be processed.They store the instructions and data in a processor.This data is further used by Control Unit.There are some registers that are set aside for specific tasks, these generally include a program counter, stack, and flags.
Love is my Shield,Truth is my Sword,Brain is my Crown,Smile is my Treasure and I'm a Queen;
Quitters never win and Winners never quit..!!!
Reply With Quote
The Following 5 Users Say Thank You to Farrah Zafar For This Useful Post:
Arain007 (Tuesday, May 22, 2012), Greatniazi (Tuesday, May 22, 2012), Hera Faraz (Monday, May 21, 2012), Man Jaanbazam (Friday, March 14, 2014), naadiya (Monday, May 21, 2012)

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

CSS Forum on Facebook Follow CSS Forum on Twitter

Disclaimer: All messages made available as part of this discussion group (including any bulletin boards and chat rooms) and any opinions, advice, statements or other information contained in any messages posted or transmitted by any third party are the responsibility of the author of that message and not of (unless is specifically identified as the author of the message). The fact that a particular message is posted on or transmitted using this web site does not mean that CSSForum has endorsed that message in any way or verified the accuracy, completeness or usefulness of any message. We encourage visitors to the forum to report any objectionable message in site feedback. This forum is not monitored 24/7.

Sponsors: ArgusVision   vBulletin, Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.