case vhdl code example

Example 1: switch case within process vhdl

p_CASE : process (r_VAL_1, r_VAL_2, r_VAL_3)
    variable v_CONCATENATE : std_logic_vector(2 downto 0);
  begin
    v_CONCATENATE := r_VAL_1 & r_VAL_2 & r_VAL_3;
     
    case v_CONCATENATE is
      when "000" | "100" =>
        r_RESULT <= 0;
      when "001" =>
        r_RESULT <= 1;
      when "010" =>
        r_RESULT <= 2;
      when others =>
        r_RESULT <= 9;
    end case;
     
  end process;

Example 2: case vhdl

case SEL is
  when "01" =>   Z <= A;
  when "10" =>   Z <= B;
  when others => Z <= 'X';
end case;