16 Bit Full Adder Vhdl Code For Serial Adder
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How to Design a 16 Bit Full Adder in VHDL for Serial Addition
In this article, we will learn how to design a 16 bit full adder in VHDL for serial addition. A serial adder is a circuit that can perform binary addition of two numbers by processing one bit at a time. A full adder is a circuit that can add two bits and a carry bit and produce a sum bit and a carry out bit.
To design a 16 bit full adder in VHDL, we will use the following components:
A parallel input serial output (PISO) shift register that can convert a 16 bit parallel input into a serial output.
A D flip flop that can store one bit of data.
A full adder that can add two bits and a carry bit.
The schematic of the 16 bit full adder for serial addition is shown below:
The VHDL code for each component is given below:
-- PISO.vhd
-- Parallel input serial output shift register
library ieee;
use ieee.std_logic_1164.all;
entity PISO is
port (
clk, rst, load : in std_logic;
data_in : in std_logic_vector(15 downto 0);
data_out : out std_logic
);
end PISO;
architecture behav of PISO is
signal reg : std_logic_vector(15 downto 0);
begin
process (clk, rst)
begin
if rst = '1' then
reg '0');
elsif rising_edge(clk) then
if load = '1' then
reg 4aad9cdaf3