Question

3. Write a complete VHDL program that finds maximum of three unsigned numbers using concurrent statements only. Assume these numbers are 8 bit wide. How does your program change if these numbers are signed

Answer 1

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.math_real.ALL;

entity findmax is
  port (
    clk : in std_logic;
    clr : in std_logic;
    din : in real;
    max : out real;
  );
end findmax ;

architecture Behavioral of findmax is
signal m : real := 0.0;
begin
  process begin
    wait until rising_edge(clk);
      if clr='1' then
        m <= 0.0;
      elsif din>m then
        m <= din;
      end if;    
    end if;
  end process;
  
  max <= m;
end Behavioral;

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