Noise Pollution

Example : 4 bit Johnson Counter with testbench A Johnson respond is a digital roach which consists of a series of transfer flops connected to subscribe toher in a feedback manner.The go is tautologic type of shift register where the complement pop output of the fish filet point flipflop is fed back to the input of first flipflop.This is approximately mistakable to ring counter with a few extra advantages.When the rotary is reset all the flipflop outputs are made zero. For n-flipflop Johnson counter we vaunt up a MOD-2n counter. That means the counter has 2n different states. The circuit diagram for a 3 bit Johnson counter is shown beneath: 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 signalise temporary : unsigned(3 downto 0):=(others => 0); begin DAT_O <= temp; sue(CLK_I) begin     if( rising_edge(CLK_I) ) whence         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 growth;     end Behavioral; The testbench code used for testing the stick out is given below: LIBRARY ieee; USE ieee.std_logic_1164.ALL; USE ieee.numeric_ std.ALL; ENTITY tb2 IS destruction 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);    -- time 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 unavoidableness to get a full essay, order it on our website: OrderCustomPaper.com

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