CPU
(Central
Processing Unit)
CPU stands For Central
Processing Unit. It’s the most important part of the computer system.
·
In large Computers such
as Super Computer and mainframe Computers CPU consists of a number of chips
installed on several circuit boards.
·
In personal computers
CPU consist on a single chip because of its smaller size. A single chip CPU is
also called microprocessor.
CPU consists on two units
> Arithmetic/Logic Unit and Control
Unit.
Control Unit :
It’s
a component of Computer and the part of CPU. It controls the operations of the
processor. It’s working is that it tells the computer’s memory,
arithmetic/logic unit , input and output devices that how to respond to the
program’s instructions. It gets the instruction from the main memory and then
decodes them. It then initiates actions to carry out the instructions.
It
directs the operation of the other units by providing timing and control
signals. Most computer resources are manage by the CU(control unit). It also
directs or controls the data between CPU (central processing unit) and other
devices. In modern computer designs, the control
unit is typically an internal part of the CPU with its overall role and operation unchanged since its
introduction.
Arithmetic/logic
Unit :
Arithmetic/logic Unit or ALU is a part of the CPU (Central
Processing Unit). It performs all the Arithmetic
and Logic operations on the
data. Arithmetic operations are the basic functions such as
multiplications, subtractions, additions and division.
On the other hand the Logic operations compared one
number with the other number that which number is greater or smaller. Basically
it compared two values. The inputs to an ALU
are the data to be operated on, called operands, and a code indicating
the operation to be performed; the ALU's output is the result of the performed
operation. In many designs, the ALU also exchanges additional information with
a Status Register, which relates to the result of the current or previous
operations.
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