75 lines
5.1 KiB
VHDL
75 lines
5.1 KiB
VHDL
library IEEE;
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use IEEE.std_logic_1164.all;
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-- A testbench has no ports.
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entity mux8way16_tb is
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end mux8way16_tb;
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architecture mux8way16_tb_arch of mux8way16_tb is
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-- Declaration of the component that will be instantiated.
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component mux8way16
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port (a, b, c, d, e, f, g, h : in std_logic_vector(15 downto 0);
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sel : in std_logic_vector(2 downto 0);
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cout : out std_logic_vector(15 downto 0));
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end component;
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-- Specifies which entity is bound with the component.
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for mux8way16_0: mux8way16 use entity work.mux8way16;
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signal a, b, c, d, e, f, g, h, cout : std_logic_vector(15 downto 0);
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signal sel : std_logic_vector(2 downto 0);
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begin
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-- Component instantiation.
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mux8way16_0: mux8way16 port map (a, b, c, d, e, f, g, h, sel, cout);
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-- This process does the real job.
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process
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type pattern_type is record
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-- The inputs of the mux8way16.
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a, b, c, d, e, f, g, h : std_logic_vector(15 downto 0);
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sel : std_logic_vector(2 downto 0);
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-- The expected outputs of the mux8way16.
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cout : std_logic_vector(15 downto 0);
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end record;
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-- The patterns to apply.
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type pattern_array is array (natural range <>) of pattern_type;
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constant patterns : pattern_array :=
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(("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "000", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "001", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "010", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "011", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "100", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "101", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "110", "0000000000000000"),
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("0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "0000000000000000", "111", "0000000000000000"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "000", "0001001000110100"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "001", "0010001101000101"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "010", "0011010001010110"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "011", "0100010101100111"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "100", "0101011001111000"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "101", "0110011110001001"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "110", "0111100010011010"),
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("0001001000110100", "0010001101000101", "0011010001010110", "0100010101100111", "0101011001111000", "0110011110001001", "0111100010011010", "1000100110101011", "111", "1000100110101011"));
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begin
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-- Check each pattern.
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for i in patterns'range loop
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-- Set the inputs.
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a <= patterns(i).a;
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b <= patterns(i).b;
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c <= patterns(i).c;
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d <= patterns(i).d;
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e <= patterns(i).e;
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f <= patterns(i).f;
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g <= patterns(i).g;
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h <= patterns(i).h;
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sel <= patterns(i).sel;
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-- Wait for the results.
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wait for 1 ns;
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-- Check the outputs.
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assert cout = patterns(i).cout
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report "bad mux8way16 output" severity error;
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end loop;
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assert false report "end of test" severity note;
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-- Wait forever; this will finish the simulation.
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wait;
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end process;
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end mux8way16_tb_arch;
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