What pipeline?

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Input:

I need to write the VHDL code of the following pipeline circuit:
The circuit receives 2 control signals and two input signal of n bit and
it does the follow operations:
A+B if c0=c1=0
-A-B if c0=c1=1
A-B if c1=0 and c0=0
-A+B if c1=1 and c0=0

Answer:

To implement this circuit in VHDL, you will need to use an if-else 
statement to determine the output based on the values of the control 
signals c0 and c1. Here is an example of how you can write the VHDL code 
for this circuit:

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library ieee;

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use ieee.std_logic_1164.all;

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entity pipeline_circuit is

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  port (

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    c0 : in std_logic;

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    c1 : in std_logic;

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    A : in std_logic_vector(n-1 downto 0);

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    B : in std_logic_vector(n-1 downto 0);

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    result : out std_logic_vector(n-1 downto 0)

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  );

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end pipeline_circuit;

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architecture behavioral of pipeline_circuit is

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begin

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  process(c0, c1, A, B)

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  begin

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    if (c0 = '0' and c1 = '0') then

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      result <= A + B;

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    elsif (c0 = '1' and c1 = '1') then

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      result <= -A - B;

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    elsif (c1 = '0' and c0 = '0') then

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      result <= A - B;

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    elsif (c1 = '1' and c0 = '0') then

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      result <= -A + B;

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    else

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      result <= (others => 'Z');  -- default value for result

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    end if;

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  end process;

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end behavioral;

This code defines an entity called "pipeline_circuit" with four inputs 
(c0, c1, A, and B) and one output (result). The output is determined by 
the values of the control signals c0 and c1 using the if-else statement 
in the process.

I hope this helps! Let me know if you have any questions.