1.6 Computer Science - created from Mind Map

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EEPROM-Electronically Erasable Programmable Read Only Memory

HDD-Hard Disk Drive(moving parts)

I/O- Input/Output

System Buses

Processor-Cores

RAM- Random Access Memory

Key Words

Processor Speed

CPU- Central Processing Unit

I/O Controllers

Peripherals

SDD- Solid State Drive(no moving parts)

Address Bus- Uni-directional

A bus is a set of parallel wires connecting two or more independent components of a computer system.

Data Bus- Bi-directional

Control Bus

Each processor has a 'core' in which instructions are executed

Processors can be multi-core

Each core executes instructions independently

Cores

Dual core

Quad core

8 Core

Quadrupling the number of cores may quadruple the number of instructions executed per second

Holds data and instructions that are currently in use by the processor

ROM- Read Only Memory

Hertz- Number of cycles per second and measures processor speed

Execute- carry out an instruction or program

Embedded system- A computer system within another device, examples; washing machines, microwaves, tumble dryers etc.

Clock Speed- The operating speed of a computer

Cache- Very fast, usually a very small amount of memory

MHz- 1 million instructions per second

GHz- 1 billion instructions per second

Measured Hertz(Hz)

Typical speeds have spanned across MHz and GHz

1 GHz processor executes 1 billion instructions per second

2 GHz processor executes 2 billion instructions per second

The purpose of CPU is to carry out program instructions

Fetch

Decode

Execute

Memory stores the program

These are used to allow an interface between a hardware device external to the motherboard and the processor itself

I/O Ports

Allow communication from an I/O device and the motherboard

Are any devices that are not directly connected to the CPU