written 6.7 years ago by | modified 2.7 years ago by |
Subject: Digital System Design
Topic: Introduction to VHDL
Difficulty: Medium
written 6.7 years ago by | modified 2.7 years ago by |
Subject: Digital System Design
Topic: Introduction to VHDL
Difficulty: Medium
written 6.5 years ago by |
VHDL Code for 4 Bit Ripple Carry Adder:
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
entity Ripple_Adder is
Port ( A : in STD_LOGIC_VECTOR (3 downto 0);
B : in STD_LOGIC_VECTOR (3 downto 0);
Cin : in STD_LOGIC;
S : out STD_LOGIC_VECTOR (3 downto 0);
Cout : out STD_LOGIC);
end Ripple_Adder;
architecture Behavioral of Ripple_Adder is
-- Full Adder VHDL Code Component Decalaration
component full_adder_vhdl_code
Port ( A : in STD_LOGIC;
B : in STD_LOGIC;
Cin : in STD_LOGIC;
S : out STD_LOGIC;
Cout : out STD_LOGIC);
end component;
-- Intermediate Carry declaration
signal c1,c2,c3: STD_LOGIC;
begin
-- Port Mapping Full Adder 4 times
FA1: full_adder_vhdl_code port map( A(0), B(0), Cin, S(0), c1);
FA2: full_adder_vhdl_code port map( A(1), B(1), c1, S(1), c2);
FA3: full_adder_vhdl_code port map( A(2), B(2), c2, S(2), c3);
FA4: full_adder_vhdl_code port map( A(3), B(3), c3, S(3), Cout);
end Behavioral;