VHDL Code For NOR Gate

Program for NOR Gate:-

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

               

---- Uncomment the following library declaration if instantiating

---- any Xilinx primitives in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

                               

entity nor_a is

 Port ( a : in  STD_LOGIC;

 b : in  STD_LOGIC;

           c : out  STD_LOGIC);

end nor_a;

               

architecture dataflow of nor_a is

                begin

                c<=a nor b;

end dataflow;