Subversion Repositories ttl_library

-----------------------------------------------------------------------

-- Bipolar TTL models (VHDL)                                         --

-- David R Brooks                                                    --

-- December, 2016.  Perth, Australia                                 --

-- Compliance: VHDL 2008                                             --

-- Testbench for SN74LS365N: Hex 3-state buffer                      --

-----------------------------------------------------------------------

library ieee;

    use ieee.std_logic_1164.all;

    use ieee.std_logic_misc.all;

    use ieee.numeric_std.all;

    use work.LSTTL.all;

    use work.TTLPrivate.all;

entity Testbench_365 is     -- Top-level bench

generic(

    StimClk  : std_logic      := '1';

    CheckClk : std_logic      := '1';

    Period   : time           :=  50 ns;

    Finish   : time           := 200 us;

    SevLevel : severity_level := failure

);

end entity;

architecture Test of Testbench_365 is

    signal J, B : unsigned(5 downto 0);         -- Test stimuli

    signal D, E : std_logic_vector(5 downto 0); -- Expected & actual results

    signal EN   : std_logic;

    begin

        EN <= not(J(1) or J(0));

    -----------------------------------------------------------------------

    -- Standard testbench components

    -----------------------------------------------------------------------

    TB: TTLBench

    generic map(

        StimClk  => StimClk,

        CheckClk => CheckClk,

        Period   => Period,

        Finish   => Finish,

        SevLevel => SevLevel

    )

    port map(

        J   => J,

        B   => B,

        CLK => open,

        RS  => open,

        D   => D,

        E   => E

    );

    -----------------------------------------------------------------------

    -- Generate expected results (with zero delays)

    -----------------------------------------------------------------------

    D <= std_logic_vector(B) when EN = '1' else (others => 'Z');

    -----------------------------------------------------------------------

    -- Device Under Test...                        

    -----------------------------------------------------------------------

    DUT: SN74LS365AN

    port map(

        X_1  => J(0),  -- E1\

        X_2  => B(0),  -- A1

        X_3  => E(0),  -- Y1

        X_4  => B(1),  -- A2

        X_5  => E(1),  -- Y2

        X_6  => B(2),  -- A3

        X_7  => E(2),  -- Y3

        X_8  => open,  -- GND

        X_9  => E(3),  -- Y4

        X_10 => B(3),  -- A4

        X_11 => E(4),  -- Y5

        X_12 => B(4),  -- A5

        X_13 => E(5),  -- Y6

        X_14 => B(5),  -- A6

        X_15 => J(1),  -- E2\

        X_16 => open   -- Vcc

);

end architecture Test;