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FULL ADDER IN VHDL VERILOG



A full adder is a digital circuit that performs addition of two single-bit binary numbers, including the carry bit from a previous addition. It has three inputs (input1, input2, and carry_in) and two outputs (sum and carry_out). The sum output is the XOR of the three inputs, and the carry_out output is the OR of the three inputs, with the AND operation used to compute the carry out bit.

Here is an example of how you might implement a full adder in VHDL:

 library ieee;

entity full_adder is

    port(

        input1 : in std_logic;

        input2 : in std_logic;

        carry_in : in std_logic;

        sum : out std_logic;

        carry_out : out std_logic

    );

end full_adder;


architecture behavioral of full_adder is

begin

    -- Combinational logic to perform the addition

    sum <= input1 xor input2 xor carry_in;

    carry_out <= (input1 and input2) or (input1 and carry_in) or (input2 and carry_in);

end behavioral;



This example defines a digital circuit with three inputs (input1, input2, and carry_in) and two outputs (sum and carry_out). The combinational logic in the architecture block uses the XOR and OR operators, along with the AND operator, to compute the sum and carry_out outputs, respectively.

To use the full adder to add two single-bit binary numbers, you would set the input1 and input2 signals to the binary numbers you want to add, and the carry_in signal to the carry bit from a previous addition (if any). The sum and carry_out outputs will contain the result of the addition, including the carry out bit.

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