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What is a cpu and what does it do?

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Emma McArthur

on 14 December 2015

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Transcript of What is a cpu and what does it do?

What is a CPU?
A CPU or Central Processing Unit is a piece of hardware that handles all the instructions given to your computer. It controls all the computer operations and tells the memory to store commonly used operations so it can perform them easier seeming like it did it quicker
The Components
The Control Unit- Coordinates and controls all parts of the computer system
Arithmetic-Logic Unit- Performs arithmetic or logical operations
Registers- Stores the most frequently used instructions and data
Control Unit- Manages four basic operations
Control Units:
> Fetch- Gets the next program instruction from the computers memory
> Decode- Figure out what the program is telling the computer what to do
> Execute- Perform the requested actions
> Write-back (Store)- write
(store) the results to a
register or to memory

Arithmetic-Logic Unit (ALU)
(The ALU performs basic arithmetic or logic orperations)
The Speed of a CPU
Clock speed is used to determine how quickly a cpu can fetch, decode and execute instructions to keep a computer running smoothly.
A speed of 3Mhz would mean that a CPU could fetch, decode and execute 3 million sets of instructions per second.

The Brain
The CPU is also reffered to as the brain of the computer as it controls what the computer does acting upon the instructions given by you pressing the keys on the keyboard, clicking the mouse, etc.
What is a cpu and what does it do?
The different parts of a cpu

> Add, subtract, multiply, divdes
> Compare two items to see which one is larger or smaller
Quad-Core Processor
Quad-cores are 4 CPUs that perform 4 different tasks simaltaneously meaning that a computer can perform tasks easier leading to a better performance. Quad-core doesn't mean tasks are performed quicker it means that they are performed at the same time
Memory Types
Virtual Memory
• It is memory that is there but isn’t there. It is when the hard drive is used to help the RAM store data, almost like an extension. The more virtual memory you have the slower your computer is and it’s volatile.
Flash Memory
Flash is EEPROM Electrically Erasable Programmable Read-only Memory). It is generally faster than another types of memory, is non-volatile meaning it is a permanent storage and has no moving parts so that if you knocked it while it was running it wouldn’t effect it as much as memories with moving parts. It is permanent storage and is normally used in smaller
Cache Memory
• The cache memory sits between the RAM and the CPU, it speeds up the time it takes for the memory for RAM to get to the CPU. The RAM isn’t as fast as the CPU and the term ‘bottleneck’ means that the RAM slows down the CPUs processing as the RAM's process rate is slower. So cache memory is added to help the memory reach the CPU, the closer and smaller the cache memory is the quicker it gets the memory to the CPU.
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