std_logic_arith 的包头

library IEEE;
use IEEE.std_logic_1164.all;

package std_logic_arith is

type UNSIGNED is array (NATURAL range <>) of STD_LOGIC;
type SIGNED is array (NATURAL range <>) of STD_LOGIC;
subtype SMALL_INT is INTEGER range 0 to 1;

function "+"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED; R: SIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: SIGNED) return SIGNED;
function "+"(L: SIGNED; R: UNSIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: INTEGER) return UNSIGNED;
function "+"(L: INTEGER; R: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED; R: INTEGER) return SIGNED;
function "+"(L: INTEGER; R: SIGNED) return SIGNED;
function "+"(L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED;
function "+"(L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED; R: STD_ULOGIC) return SIGNED;
function "+"(L: STD_ULOGIC; R: SIGNED) return SIGNED;

function "+"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "+"(L: INTEGER; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "+"(L: INTEGER; R: SIGNED) return STD_LOGIC_VECTOR;
function "+"(L: UNSIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "+"(L: STD_ULOGIC; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "+"(L: STD_ULOGIC; R: SIGNED) return STD_LOGIC_VECTOR;

function "-"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED;
function "-"(L: SIGNED; R: SIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: SIGNED) return SIGNED;
function "-"(L: SIGNED; R: UNSIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: INTEGER) return UNSIGNED;
function "-"(L: INTEGER; R: UNSIGNED) return UNSIGNED;
function "-"(L: SIGNED; R: INTEGER) return SIGNED;
function "-"(L: INTEGER; R: SIGNED) return SIGNED;
function "-"(L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED;
function "-"(L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED;
function "-"(L: SIGNED; R: STD_ULOGIC) return SIGNED;
function "-"(L: STD_ULOGIC; R: SIGNED) return SIGNED;

function "-"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "-"(L: INTEGER; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: INTEGER) return STD_LOGIC_VECTOR;
function "-"(L: INTEGER; R: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: UNSIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "-"(L: STD_ULOGIC; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED; R: STD_ULOGIC) return STD_LOGIC_VECTOR;
function "-"(L: STD_ULOGIC; R: SIGNED) return STD_LOGIC_VECTOR;

function "+"(L: UNSIGNED) return UNSIGNED;
function "+"(L: SIGNED) return SIGNED;
function "-"(L: SIGNED) return SIGNED;
function "ABS"(L: SIGNED) return SIGNED;

function "+"(L: UNSIGNED) return STD_LOGIC_VECTOR;
function "+"(L: SIGNED) return STD_LOGIC_VECTOR;
function "-"(L: SIGNED) return STD_LOGIC_VECTOR;
function "ABS"(L: SIGNED) return STD_LOGIC_VECTOR;

function "*"(L: UNSIGNED; R: UNSIGNED) return UNSIGNED;
function "*"(L: SIGNED; R: SIGNED) return SIGNED;
function "*"(L: SIGNED; R: UNSIGNED) return SIGNED;
function "*"(L: UNSIGNED; R: SIGNED) return SIGNED;

function "*"(L: UNSIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "*"(L: SIGNED; R: SIGNED) return STD_LOGIC_VECTOR;
function "*"(L: SIGNED; R: UNSIGNED) return STD_LOGIC_VECTOR;
function "*"(L: UNSIGNED; R: SIGNED) return STD_LOGIC_VECTOR;

function "<"(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "<"(L: SIGNED; R: SIGNED) return BOOLEAN;
function "<"(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "<"(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "<"(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "<"(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "<"(L: SIGNED; R: INTEGER) return BOOLEAN;
function "<"(L: INTEGER; R: SIGNED) return BOOLEAN;

function "<="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "<="(L: SIGNED; R: SIGNED) return BOOLEAN;
function "<="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "<="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "<="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "<="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "<="(L: SIGNED; R: INTEGER) return BOOLEAN;
function "<="(L: INTEGER; R: SIGNED) return BOOLEAN;

function ">"(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function ">"(L: SIGNED; R: SIGNED) return BOOLEAN;
function ">"(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function ">"(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function ">"(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function ">"(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function ">"(L: SIGNED; R: INTEGER) return BOOLEAN;
function ">"(L: INTEGER; R: SIGNED) return BOOLEAN;

function ">="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function ">="(L: SIGNED; R: SIGNED) return BOOLEAN;
function ">="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function ">="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function ">="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function ">="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function ">="(L: SIGNED; R: INTEGER) return BOOLEAN;
function ">="(L: INTEGER; R: SIGNED) return BOOLEAN;

function "="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "="(L: SIGNED; R: SIGNED) return BOOLEAN;
function "="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "="(L: SIGNED; R: INTEGER) return BOOLEAN;
function "="(L: INTEGER; R: SIGNED) return BOOLEAN;

function "/="(L: UNSIGNED; R: UNSIGNED) return BOOLEAN;
function "/="(L: SIGNED; R: SIGNED) return BOOLEAN;
function "/="(L: UNSIGNED; R: SIGNED) return BOOLEAN;
function "/="(L: SIGNED; R: UNSIGNED) return BOOLEAN;
function "/="(L: UNSIGNED; R: INTEGER) return BOOLEAN;
function "/="(L: INTEGER; R: UNSIGNED) return BOOLEAN;
function "/="(L: SIGNED; R: INTEGER) return BOOLEAN;
function "/="(L: INTEGER; R: SIGNED) return BOOLEAN;

function SHL(ARG: UNSIGNED; COUNT: UNSIGNED) return UNSIGNED;
function SHL(ARG: SIGNED; COUNT: UNSIGNED) return SIGNED;
function SHR(ARG: UNSIGNED; COUNT: UNSIGNED) return UNSIGNED;
function SHR(ARG: SIGNED; COUNT: UNSIGNED) return SIGNED;

function CONV_INTEGER(ARG: INTEGER) return INTEGER;
function CONV_INTEGER(ARG: UNSIGNED) return INTEGER;
function CONV_INTEGER(ARG: SIGNED) return INTEGER;
function CONV_INTEGER(ARG: STD_ULOGIC) return SMALL_INT;

function CONV_UNSIGNED(ARG: INTEGER; SIZE: INTEGER) return UNSIGNED;
function CONV_UNSIGNED(ARG: UNSIGNED; SIZE: INTEGER) return UNSIGNED;
function CONV_UNSIGNED(ARG: SIGNED; SIZE: INTEGER) return UNSIGNED;
function CONV_UNSIGNED(ARG: STD_ULOGIC; SIZE: INTEGER) return UNSIGNED;

function CONV_SIGNED(ARG: INTEGER; SIZE: INTEGER) return SIGNED;
function CONV_SIGNED(ARG: UNSIGNED; SIZE: INTEGER) return SIGNED;
function CONV_SIGNED(ARG: SIGNED; SIZE: INTEGER) return SIGNED;
function CONV_SIGNED(ARG: STD_ULOGIC; SIZE: INTEGER) return SIGNED;

function CONV_STD_LOGIC_VECTOR(ARG: INTEGER; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
function CONV_STD_LOGIC_VECTOR(ARG: UNSIGNED; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
function CONV_STD_LOGIC_VECTOR(ARG: SIGNED; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
function CONV_STD_LOGIC_VECTOR(ARG: STD_ULOGIC; SIZE: INTEGER)
return STD_LOGIC_VECTOR;
-- zero extend STD_LOGIC_VECTOR (ARG) to SIZE,
-- SIZE < 0 is same as SIZE = 0
-- returns STD_LOGIC_VECTOR(SIZE-1 downto 0)
function EXT(ARG: STD_LOGIC_VECTOR; SIZE: INTEGER) return STD_LOGIC_VECTOR;

-- sign extend STD_LOGIC_VECTOR (ARG) to SIZE,
-- SIZE < 0 is same as SIZE = 0
-- return STD_LOGIC_VECTOR(SIZE-1 downto 0)
function SXT(ARG: STD_LOGIC_VECTOR; SIZE: INTEGER) return STD_LOGIC_VECTOR;

end Std_logic_arith;