Verilog program for Full Subtractor by using a behavioral model with if,elsif& then statements.

AIM:

Design and verify full subtractor by using dataflow style with select statement.

PROGRAM:

library ieee;
use ieee.std_logic_1164.all; 
entity flsub_select is
port(a:in bit_vector(2 downto 0); 
s:out bit_vector(1 downto 0)); 
end flsub_select;
architecture beh of flsub_select is begin
with a select
s<=("00") when "000",
("11") when "001",
("11") when "010",
("01") when "011",
("10") when "100",
("00") when "101",
("00") when "110",
("11") when "111";
end beh; 

SIMULATION OUTPUT:

RESULT: Full subtractor using dataflow style with select statement is simulated and verified.