The logic gate is a circuit having one or more inputs and one output and output iis at logic level 0 or 1 for the definite conditions of input logic level.there are different types of logic gates such as AND , OR, NOT, NAND, NOR,EX-OR,EX-NOR etc.
Circuit:
Truth table:
| INPUT:A | INPUT:B | OR | AND |
| 0 | 0 | 0 | 0 |
| 0 | 1 | 1 | 0 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 1 | 1 |
| INPUT:A | NOT | ||
| 0 | 1 | ||
| 1 | 0 |
CODE:
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY all_gate IS
PORT(A,B:IN STD_LOGIC;
OR_OUT,AND_OUT,EXOR_OUT,EXNOR_OUT,NOT_OUT: OUT STD_LOGIC);
END all_gate;
ARCHITECTURE all_gate OF all_gate IS
BEGIN
OR_OUT <= A OR B;
AND_OUT <= A AND B;
EXOR_OUT <= A XOR B;
EXNOR_OUT <= A XNOR B;
NOT_OUT <= NOT A;
END all_gate;
WAVE FORMS:
More info On wikipedia
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