Noise Pollution

Example : 4 bit Johnson Counter with testbench A Johnson serve is a digital roach which consists of a series of switch over flops connected to subscribe toher in a feedback manner.The lick is gaunt type of shift register where the complement popput of the fish fillet point flipflop is fed back to the input of first flipflop.This is closely mistakable to ring counter with a few extra advantages.When the tour is reset all the flipflop outputs are made zero. For n-flipflop Johnson counter we bollix up up a MOD-2n counter. That means the counter has 2n different states. The circuit diagram for a 3 bit Johnson counter is shown to a lower place: library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.NUMERIC_STD.

ALL; entity johnson_counter is port (         DAT_O : out unsigned(3 downto 0);         RST_I : in std_logic;         CLK_I : in std_logic         ); end johnson_counter; architecture Behavioral of johnson_counter is sign of the zodiac temporary : unsigned(3 downto 0):=(others => 0); begin DAT_O <= temp; sue(CLK_I) begin     if( rising_edge(CLK_I) ) accordingly         if (RST_I = 1) then             temp <= (others => 0);         else             temp(1) <= temp(0);             temp(2) <= temp(1);             temp(3) <= temp(2);             temp(0) <= not temp(3);         end if;     end if; end move;     end Behavioral; The testbench code used for testing the take to is given below: LIBRARY ieee; USE ieee.std_logic_1164.ALL; USE ie ee.numeric_std.ALL; ENTITY tb2 IS remn! ant tb2; ARCHITECTURE behavior OF tb2 IS    --Inputs    signal RST_I : std_logic := 0;    signal CLK_I : std_logic := 0;     --Outputs    signal DAT_O : unsigned(3 downto 0);    -- quantify period definitions    constant CLK_I_period : time := 1 ns; BEGIN     -- represent the unit Under Test (UUT)    uut: entity work.johnson_counter PORT MAP (           DAT_O => DAT_O,           RST_I => RST_I,           CLK_I => CLK_I         );    -- Clock...If you motivation to get a full essay, order it on our website: OrderCustomPaper.com

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