Design of 4 Bit Binary Counter using Behavior Modeling Style (VHDL Code).

Design of 4 Bit Binary Counter using Behavior Modeling Style -

Output Waveform :   4 Bit Binary Counter

VHDL Code -



-------------------------------------------------------------------------------
--
-- Title       : counter_4bit
-- Design      : vhdl_upload2
-- Author      : Naresh Singh Dobal
-- Company     : nsdobal@gmail.com
-- VHDL Programs &  Exercise with Naresh Singh Dobal.
--
-------------------------------------------------------------------------------
--
-- File        : Design of 4 bit counter using behavior modeling style.vhd


library IEEE;
use IEEE.STD_LOGIC_1164.all;  
use IEEE.STD_LOGIC_ARITH.all;
use IEEE.STD_LOGIC_UNSIGNED.all;

entity counter_4bit is
     port(
         clk : in STD_LOGIC;
         reset : in STD_LOGIC;
         dout : out STD_LOGIC_VECTOR(3 downto 0)
         );
end counter_4bit;

architecture counter_4bit_arc of counter_4bit is
begin

    counting : process (clk,reset) is
    variable m : std_logic_vector (3 downto 0) := "0000";
    begin
        if (reset='1') then
            m := "0000";
        elsif (rising_edge (clk)) then
            m := m + 1;
        end if;
        dout <= m;
    end process counting;

end counter_4bit_arc;