-- --------------------------------------------------------------------
--
-- Title : STD_LOGIC_ARITH arithmetic support for STD_ULOGIC/
-- : STD_LOGIC_VECTOR data type
-- Library : This package shall be compiled into a logical library
-- : named IEEE.
-- Purpose : To support unsigned arithmetic operations such as
-- : addition, subtraction, multiplication etc. for std_ulogic
-- : and std_logic_vector data types. Besides it supports
-- : functions and operators for Conditional operations,
-- : shift operations, relational operation between integer
-- : and std_logic_vector types, aligning size between operands
-- : of different sizes, type conversion.
-- : It also supports a set of arithemtic, conversion, and
-- : comparison functions for SIGNED, UNSIGNED, SMALL_INT,
-- : INTEGER, STD_ULOGIC, STD_LOGIC, and STD_LOGIC_VECTOR.
-- :
-- Note : No declarations or definitions shall be included in,
-- : or excluded from this package.
-- :
-- : Modification History: TH, 24th Jan., 1994
-- : Following functions are overloaded for STD_ULOGIC_VECTOR
-- : type: "+", "-", "*", "cond_op", "<", ">", "<=", ">=", "=",
-- : "/=", sh_left, sh_right, align_size and "to_integer"
-- : New functions added are:
-- : To_StdUlogicVector (oper: INTEGER; length: NATURAL)
-- : return STD_ULOGIC_VECTOR
-- : "+"(op1: STD_ULOGIC; op2: STD_ULOGIC) return STD_ULOGIC;
-- : "-"(op1: STD_ULOGIC; op2: STD_ULOGIC) return STD_ULOGIC;
--
-- : Name changes from STD_LOGIC_ARITH to STD_LOGIC_ARITH
-- : operator "/" added.
-- : Vinaya: 13/9/94.
--------------------------------------------------------------------------
library IEEE;
use IEEE.std_logic_1164.all;
package STD_LOGIC_ARITH is
-- ADD/SUBTRACT OPERATORS
function "+"(op1, op2: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "+"(op1: STD_LOGIC_VECTOR; op2: STD_ULOGIC)
return STD_LOGIC_VECTOR;
function "+"(op1: STD_ULOGIC; op2: STD_LOGIC_VECTOR)
return STD_LOGIC_VECTOR;
function "+"(op1: INTEGER; op2: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "+"(op1: STD_LOGIC_VECTOR; op2: INTEGER) return STD_LOGIC_VECTOR;
function "+"(op1, op2: STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "+"(op1: STD_ULOGIC_VECTOR; op2: STD_ULOGIC)
return STD_ULOGIC_VECTOR;
function "+"(op1: STD_ULOGIC; op2: STD_ULOGIC_VECTOR)
return STD_ULOGIC_VECTOR;
function "+"(op1: INTEGER; op2: STD_ULOGIC_VECTOR)
return STD_ULOGIC_VECTOR;
function "+"(op1: STD_ULOGIC_VECTOR; op2: INTEGER)
return STD_ULOGIC_VECTOR;
function "+"(op1, op2 : STD_ULOGIC) return STD_ULOGIC;
function "-"(op1, op2: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "-"(op1: STD_LOGIC_VECTOR; op2: STD_ULOGIC)
return STD_LOGIC_VECTOR;
function "-"(op1: STD_ULOGIC; op2: STD_LOGIC_VECTOR)
return STD_LOGIC_VECTOR;
function "-"(op1: INTEGER; op2: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "-"(op1: STD_LOGIC_VECTOR; op2: INTEGER) return STD_LOGIC_VECTOR;
function "-"(op1, op2: STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "-"(op1: STD_ULOGIC_VECTOR; op2: STD_ULOGIC)
return STD_ULOGIC_VECTOR;
function "-"(op1: STD_ULOGIC; op2: STD_ULOGIC_VECTOR)
return STD_ULOGIC_VECTOR;
function "-"(op1: INTEGER; op2: STD_ULOGIC_VECTOR)return STD_ULOGIC_VECTOR;
function "-"(op1: STD_ULOGIC_VECTOR; op2: INTEGER)return STD_ULOGIC_VECTOR;
function "-"(op1, op2 : STD_ULOGIC) return STD_ULOGIC;
-- UNARY OPERATORS
function "+" (op1: STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "+" (op1: STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
-- MULTIPLYING OPERATORS
function "*" (op1, op2 : STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "*" (op1: STD_ULOGIC; op2 : STD_LOGIC_VECTOR)
return STD_LOGIC_VECTOR;
function "*" (op1: STD_LOGIC_VECTOR; op2 : STD_ULOGIC)
return STD_LOGIC_VECTOR;
function "*" (op1, op2 : STD_ULOGIC) return STD_ULOGIC;
function "*" (op1, op2 : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "*" (op1: STD_ULOGIC; op2 : STD_ULOGIC_VECTOR)
return STD_ULOGIC_VECTOR;
function "*" (op1: STD_ULOGIC_VECTOR; op2 : STD_ULOGIC)
return STD_ULOGIC_VECTOR;
-- DIVISION OPERATORS
-- The division operators are only for internal use
-- It is not advisible to use them in design.
function "/" (op1, op2 : STD_LOGIC_VECTOR) return STD_LOGIC_VECTOR;
function "/" (op1: STD_LOGIC_VECTOR; op2 : STD_ULOGIC)
return STD_LOGIC_VECTOR;
function "/" (op1: STD_ULOGIC; op2 : STD_LOGIC_VECTOR)
return STD_ULOGIC;
function "/" (op1, op2 : STD_ULOGIC) return STD_ULOGIC;
-- CONDITIONAL FUNCTIONS
function cond_op (cond : boolean; left_val, right_val: STD_LOGIC_VECTOR)
return STD_LOGIC_VECTOR;
function cond_op (cond : boolean; left_val, right_val: STD_ULOGIC)
return STD_ULOGIC;
function cond_op (cond : boolean; left_val, right_val: STD_ULOGIC_VECTOR)
return STD_ULOGIC_VECTOR;
-- RELATIONAL OPERATORS
function "<"(op1: INTEGER; op2: STD_LOGIC_VECTOR) return BOOLEAN;
function "<"(op1: STD_LOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "<="(op1: INTEGER; op2: STD_LOGIC_VECTOR) return BOOLEAN;
function "<="(op1: STD_LOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function ">"(op1: INTEGER; op2: STD_LOGIC_VECTOR) return BOOLEAN;
function ">"(op1: STD_LOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function ">="(op1: INTEGER; op2: STD_LOGIC_VECTOR) return BOOLEAN;
function ">="(op1: STD_LOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "="(op1: INTEGER; op2: STD_LOGIC_VECTOR) return BOOLEAN;
function "="(op1: STD_LOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "/="(op1: INTEGER; op2: STD_LOGIC_VECTOR) return BOOLEAN;
function "/="(op1: STD_LOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "<"(op1: INTEGER; op2: STD_ULOGIC_VECTOR) return BOOLEAN;
function "<"(op1: STD_ULOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "<="(op1: INTEGER; op2: STD_ULOGIC_VECTOR) return BOOLEAN;
function "<="(op1: STD_ULOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function ">"(op1: INTEGER; op2: STD_ULOGIC_VECTOR) return BOOLEAN;
function ">"(op1: STD_ULOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function ">="(op1: INTEGER; op2: STD_ULOGIC_VECTOR) return BOOLEAN;
function ">="(op1: STD_ULOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "="(op1: INTEGER; op2: STD_ULOGIC_VECTOR) return BOOLEAN;
function "="(op1: STD_ULOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
function "/="(op1: INTEGER; op2: STD_ULOGIC_VECTOR) return BOOLEAN;
function "/="(op1: STD_ULOGIC_VECTOR; op2: INTEGER) return BOOLEAN;
-- SHIFT OPERATORS
function sh_left(op1: STD_LOGIC_VECTOR; op2: NATURAL)
return STD_LOGIC_VECTOR;
function sh_right(op1: STD_LOGIC_VECTOR; op2: NATURAL)
return STD_LOGIC_VECTOR;
function sh_left(op1: STD_ULOGIC_VECTOR; op2: NATURAL)
return STD_ULOGIC_VECTOR;
function sh_right(op1: STD_ULOGIC_VECTOR; op2: NATURAL)
return STD_ULOGIC_VECTOR;
-- FUNCTIONS TO ALLOW ASSIGNMENTS OF STD_LOGIC_VECTOR OF UNEQUAL SIZES
function align_size (oper : STD_LOGIC_VECTOR; size : NATURAL)
return STD_LOGIC_VECTOR;
function align_size (oper : STD_ULOGIC; size : NATURAL)
return STD_LOGIC_VECTOR;
function align_size (oper : STD_ULOGIC_VECTOR; size : NATURAL)
return STD_ULOGIC_VECTOR;
function align_size (oper : STD_ULOGIC; size : NATURAL)
return STD_ULOGIC_VECTOR;
-- CONVERSION TO INTEGER FROM STD_LOGIC AND STD_LOGIC_VECTOR
function to_integer (oper : STD_LOGIC_VECTOR) return INTEGER;
function to_integer (oper: STD_ULOGIC) return INTEGER;
function to_integer (oper : STD_ULOGIC_VECTOR) return INTEGER;
-- CONVERSION TO STD_LOGIC_VECTOR FROM INTEGER
function To_StdLogicVector (oper: INTEGER; length: NATURAL)
return STD_LOGIC_VECTOR;
function To_StdUlogicVector (oper: INTEGER; length: NATURAL)
return STD_ULOGIC_VECTOR;
-- UTILITY FUNCTIONS
function drive (V: STD_LOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function drive (V: STD_ULOGIC_VECTOR) return STD_LOGIC_VECTOR;
function Sense (V: STD_ULOGIC; vZ, vU, vDC: STD_ULOGIC) return STD_ULOGIC;
function Sense (V: STD_ULOGIC_VECTOR; vZ, vU, vDC: STD_ULOGIC)
return STD_ULOGIC_VECTOR;
function Sense (V: STD_LOGIC_VECTOR; vZ, vU, vDC: STD_ULOGIC)
return STD_ULOGIC_VECTOR;
-- CONVERSION TABLE FOR TO_INTEGER
type tbl_type is array (STD_ULOGIC) of STD_ULOGIC;
constant tbl_BINARY : tbl_type :=
('X', 'X', '0', '1', 'X', 'X', '0', '1', 'X');
end STD_LOGIC_ARITH;
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