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VHDL code for AND and OR Logic Gates

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  • Last Updated : 21 Jun, 2022

Prerequisite – Introduction of Logic Gates 

Design and implement the AND and OR logic gates using VHDL (VHSIC Hardware Description Language) programming language. 

Different Types of VHDL Modelling Styles 

The architecture of VHDL code is written in three different coding styles :

  1. Dataflow Modelling 
  2. Behavioral Modelling
  3. Structural Modelling

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

 

The truth table for AND Gate is:

ABY = A AND B
000
010
100
111

Implementation of Dataflow Modelling – Below is the implementation of the above logic in the VHDL language (Dataflow Modelling).

-- 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;

-- Dataflow Modelling Style
-- 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:

ABY = A OR B
000
011
101
111

Implementation of Dataflow Modelling – Below is the implementation of the above logic in the VHDL language (Dataflow Modelling).

-- 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;

-- Dataflow Modelling Style
-- Architecture definition

architecture orLogic of orGate is

 begin
    
    Y <= A OR B;

end orLogic;
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