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computing revision part 2, NEED TO MEMORISE - Coggle Diagram
computing revision part 2
logic gates
AND GATES =D
truth table
A B Q
0 0 0
0 1 0
1 0 0
1 1 1
OR GATES =)}
truth table
A B Q
0 0 0
0 1 1
1 0 1
1 1 1
NOT GATES -I>0
truth table
A Q
0 1
1 0
locic circuits
gates joined together :
a--I>0
b-)\ c-)/
THE CPU
REGESTERS
SUPER FAST MEMORY,
PROGRAM COUNTER
stores the location in memory of the
next
intrsustion to be exicuted
memory adress regester
stores the adress of
current
memory location for data to vbe fetched from or sent too
memory data regester
stores the data fetched f
rom or waiting to be sent to mem0ry
instructin regester
stored the instructin WERE WORKING ON
Accumilater
stores the result
of any arithmetical or logical opperation performed by the alu
ELECTRONIC CLOCK
REGULATES THE RATE AT WHICH THE CONTROL UNITR RUNS.
SYNCORNISES ALL COMPUTER COMPONENTS
HIGH CLOCK SPEED= MOR EINSTRUCTIONS EXICUTE DPER SECOND
CONTROL UNIT
PETRFORS FETCH AND DECODE TASKES
ALU
DOES BASIC ARETHMETIC LOGIC OPERATIONS
PROCESSING PERFORMANCE
CLOCK SPEED
FASTER CLOCKS = HIGHER PERFORMANCE
BUS SPEED
HIGHER BUS MEANS DATA/
NEED TO MEMORISE