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;

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.

My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.