説明

ソリューション

1. Function "conv_integer" defined in Synopsys Library : std_logic_arith, defined as:
   
   function CONV_INTEGER(ARG: UNSIGNED) return INTEGER;
   function CONV_INTEGER(ARG: SIGNED) return INTEGER;
   
2. Function "To_integer" defined in IEEE library:numeric_std, defined as:
   
   
   function TO_INTEGER (ARG: UNSIGNED) return INTEGER;
   function TO_INTEGER (ARG: SIGNED) return INTEGER;

LIBRARY ieee;
USE ieee.std_logic_1164.ALL;
USE ieee.numeric_std.ALL;


entity conv_test is
Port ( a : in STD_LOGIC_VECTOR (7 downto 0);
b : out integer);
end conv_test;

architecture Behavioral of conv_test is

begin

b <= to_integer(signed(a));

end Behavioral;

b <= to_integer(unsigned(a));