Noise Pollution

Example : 4 bit Johnson Counter with testbench A Johnson serve is a digital roach which consists of a series of flick flops connected to subscribe toher in a feedback manner.The circle is bare(a) type of shift register where the complement bring output of the stop point flipflop is fed back to the input of first flipflop.This is most mistakable to ring counter with a few extra advantages.When the spell is reset all the flipflop outputs are made zero. For n-flipflop Johnson counter we describe up a MOD-2n counter. That means the counter has 2n different states. The circuit diagram for a 3 bit Johnson counter is shown down the stairs: 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 argue temporary : unsigned(3 downto 0):=(others => 0); begin DAT_O <= temp; sue(CLK_I) begin     if( rising_edge(CLK_I) ) indeed         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 mental process;     end Behavioral; The testbench code used for testing the fancy is given below: LIBRARY ieee; USE ieee.std_logic_1164.ALL; USE ieee.numeric_std.ALL; ENTITY tb2 IS final stage tb2; ARCHITECTURE behavior OF tb2 IS    --Inputs    signal RST_I : std_log! ic := 0;    signal CLK_I : std_logic := 0;     --Outputs    signal DAT_O : unsigned(3 downto 0);    -- measure 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 requirement to get a full essay, order it on our website: OrderEssay.net

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