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PIT_PIT [208]
2 years ago
15

A group of organisms that depend on one another in a local environment

Social Studies
1 answer:
vodka [1.7K]2 years ago
3 0

It is called Symbiosis.

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Develop a testbench for the Half Adder that verifies the structural model. The testbench will have no ports. Your testbench shou
Fynjy0 [20]

Answer and Explanation:

--        Here we define the AND gate that we need for

-- the Half Adder

library ieee;

use ieee.std_logic_1164.all;

entity andGate is        

  port( A, B : in std_logic;

           F : out std_logic);

end andGate;

architecture func of andGate is

begin

  F <= A and B;

end func;

--        Here we define the XOR gate that we need for

-- the Half Adder

library ieee;

use ieee.std_logic_1164.all;

entity xorGate is

  port( A, B : in std_logic;

           F : out std_logic);

end xorGate;

architecture func of xorGate is

begin

  F <= A xor B;

end func;

-- At this point we construct the half adder using

-- the AND and XOR gates

library ieee;

use ieee.std_logic_1164.all;

entity halfAdder is

  port( A, B : in std_logic;

   sum, Cout : out std_logic);

end halfAdder;

architecture halfAdder of halfAdder is

component andGate is -- import AND Gate

     port( A, B : in std_logic;

              F : out std_logic);

  end component;

component xorGate is -- import XOR Gate

    port( A, B : in std_logic;

             F : out std_logic);

  end component;

begin

G1 : xorGate port map(A, B, sum);

G2 : andGate port map(A, B, Cout);

end halfAdder;

---------------------------------------------------------END

---------------------------------------------------------END

Test Bench:

--import std_logic from the IEEE library

library ieee;

use ieee.std_logic_1164.all;

entity halfAdder_tb is

end halfAdder_tb;

architecture tb of halfAdder_tb is

component halfAdder is

    port( A, B : in std_logic;

      sum, Cout : out std_logic);

  end component;

signal A, B, sum, Cout: std_logic;

begin

  mapping: halfAdder port map(A, B, sum, Cout);

  process

  variable errCnt : integer := 0;

  begin

--TEST 1

  A <= '0';

    B <= '1';

    wait for 10 ns;

    assert(sum = '1') report "sum error 1" severity error;

    assert(Cout = '0') report "Cout error 1" severity error;

    if(sum /= '1' or Cout /= '0') then

       errCnt := errCnt + 1;

    end if;

--TEST 2

  A <= '1';

    B <= '1';

    wait for 10 ns;

    assert(sum = '0') report "sum error 2" severity error;

    assert(Cout = '1') report "Cout error 2" severity error;

    if(sum /= '0' or Cout /= '1') then

       errCnt := errCnt + 1;

    end if;

--TEST 3

  A <= '1';

    B <= '0';

    wait for 10 ns;

    assert(sum = '1') report "sum error 3" severity error;

    assert(Cout = '0') report "Cout error 3" severity error;

    if(sum /= '1' or Cout /= '0') then

        errCnt := errCnt + 1;

    end if;

---- SUMMARY ----

    if(errCnt = 0) then

      assert false report "Success!" severity note;

    else

       assert false report "Faillure!" severity note;

    end if;

end process;

end tb;

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

configuration cfg_tb of halfAdder_tb is

  for tb

  end for;

end cfg_tb;

----------------------------------------------------------END

----------------------------------------------------------END

8 0
3 years ago
Even though he has a nice singing voice, Kevin still believes he is a terrible singer because his first grade teacher told him h
NISA [10]

Answer: criticism and hurtful words

Explanation:As humans, we are easily affected by what people say. Word have power to make or Mar someone,. It has power to build and destroy. We should learn to use words because children especially takes words to heart, they believe in it and start shaping themselves or believing the negative or positive words spoken about them

6 0
3 years ago
A crowd of 10,000 to 20,000 people showed up at the Capitol for Andrew Jackson's inauguration, some traveling from 500 miles awa
ankoles [38]

Answer:

A. Poor and middle-class whites

7 0
2 years ago
Read 2 more answers
Falling prices send signals to consumers to________
Minchanka [31]

Answer: Rising prices give a signal to consumers to reduce demand or withdraw from a market completely, and they give a signal to potential producers to enter a market. Conversely, falling prices give a positive message to consumers to enter a market while sending a negative signal to producers to leave a market.

Explanation: Hopefully this helps you with whatever you are doing. This is a long answer. Hopefully you will get extra credit for this answer

6 0
3 years ago
Which number represents the continent of South America?<br> A) 1<br> B) 3<br> C) 5<br> D) 6
KonstantinChe [14]

Answer:

5

Explanation:

7 0
3 years ago
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