VHDL code for AND and OR Logic Gates

Prerequisite – Introduction of Logic Gates
Design and implement the AND and OR logic gates using VHDL (VHSIC Hardware Description Language) programming language.

1. Logic Development for AND Gate :
The AND logic gate can be realized as follows –

The truth table for AND Gate is:



A B Y = A AND B
0 0 0
0 1 0
1 0 0
1 1 1

Implementation –
Below is the implementation of the above logic in VHDL language.

-- VHDL Code for AND gate

-- Header file declaration

library IEEE;
use IEEE.std_logic_1164.all;

-- Entity declaration

entity andGate is

    port(A : in std_logic;      -- AND gate input
         B : in std_logic;      -- AND gate input
         Y : out std_logic);    -- AND gate output

end andGate;

-- Architecture definition

architecture andLogic of andGate is

 begin
    
    Y <= A AND B;

end andLogic; 

2. Logic Development for OR Gate :
The OR logic gate can be realized as follows –

The truth table for OR Gate is:

A B Y = A OR B
0 0 0
0 1 1
1 0 1
1 1 1

Implementation –
Below is the implementation of the above logic in VHDL language.

-- VHDL Code for OR gate

-- Header file declaration

library IEEE;
use IEEE.std_logic_1164.all;

-- Entity declaration

entity orGate is

    port(A : in std_logic;      -- OR gate input
         B : in std_logic;      -- OR gate input
         Y : out std_logic);    -- OR gate output

end orGate;

-- Architecture definition

architecture orLogic of orGate is

 begin
    
    Y <= A OR B;

end orLogic;

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