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COMMPUTER SCIENCE - SOFTWARE AND HARDWARE - LOGIC GATES - CHAPTER 4 / 1.3.2
COMMPUTER SCIENCE - SOFTWARE AND HARDWARE - LOGIC GATES - CHAPTER 4 / 1.3.2
LOGIC GATE TYPES
NAND Gates
Will be true unless A and B are true, opposite of AND.
NOT Gates
True if A is not true. Also known as an inverter gate.
OR Gates
True if A or B are true.
NOR Gates
True if A or B are not true, opposite of OR.
XOR Gates
True if A or B are true but false if both A and B are true, exclusively OR.
AND Gates
Will be true if A and B are true.
A logic gate is a basic foundation of a digital circuit.
Various tasks are performed in a computer by switching on a high voltage or a low voltage through a digital circuit called a logic gate. controls the flow of electronic signals in a predetermined way. High voltage is 1 and low voltage is 0
Microprocessor - an integrated circuit that provides the same function as a CPU, can have thousands of logic gates.
Truth table - a way of showing every outcome of a logic gate.
LOGIC CIRCUITS
A logic circuit is an electronic circuit that combines a number of logic gates. The gates in the logic circuit will control the flow of electricity through the circuit.
Example
A B C D E Z
0 0 0 1 0 1
1 0 0 0 0 0
0 0 1 1 0 1
1 0 1 0 0 0
0 1 0 1 0 1
1 1 0 0 0 0
0 1 1 1 1 1
1 1 1 0 1 1
Logic statements
Example
A logic circuit can also be written in the form of a logic statement, from a logic statement we can produce a logic circuit diagram.
Z = ( NOT A) OR ( B AND C)
