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Hardware and communication

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James Ring

on 13 May 2010

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Transcript of Hardware and communication

Processor Main memory has coded program instructions

The fetch – execute cycle executes these instructions

One of the registers - program counter – keeps track of the memory address of the next instruction

Control Unit
Controls the rest of the processor by generating control signals
Arithmetic and logic unit
Performs arithmetic operations and logic operations
Read / write memory cells that operate at very high speed
Buses A set (or group) of parallel lines that information (data, addresses, instructions, and other information) travels on.

These are usually inside a computer.

Information travels on buses as a series of electrical pulses.

Each pulse representing a one bit or a zero bit.
Consits of 3 main parts Internal components of a computer system Data Bus Address Bus CONTROL BUS Data Bus Transfers data from device to device

Each wire transfers one binary digit (bit)

The number of wires determines the amount of data that can be transferred at one time
Address bus The address bus carries addresses

Each wire carries one binary digit

The number of wires determines the amount of memory that can be used in the system
CONTROL BUS This carries signals that control the operation of each device

These include clock, control and other signals

To provide synchronisation,

commands to memory to read and write
several other signals to ensure the successful operation of the system Computing The system bus consists: RAM ROM Contents cannot be changed by the processor – non – volatile
To store bootstrap program that starts the operating system
To store fixed data associated with the computer system
Sometimes to store programs that remain in computer always for e.g. a palmtop may have all its programs stored in ROM This memory can be written to – Volatile

Store programs that are being executed

Stores data for immediate use

As buffers for external storage
James Ring
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