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-- --------------------------------------------------------------------
--
-- Copyright © 2008 by IEEE. All rights reserved.
--
-- This source file is an essential part of IEEE Std 1076-2008,
-- IEEE Standard VHDL Language Reference Manual. This source file may not be
-- copied, sold, or included with software that is sold without written
-- permission from the IEEE Standards Department. This source file may be
-- copied for individual use between licensed users. This source file is
-- provided on an AS IS basis. The IEEE disclaims ANY WARRANTY EXPRESS OR
-- IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY AND FITNESS FOR USE
-- FOR A PARTICULAR PURPOSE. The user of the source file shall indemnify
-- and hold IEEE harmless from any damages or liability arising out of the
-- use thereof.
--
-- Title : Standard multivalue logic package
-- : (STD_LOGIC_1164 package declaration)
-- :
-- Library : This package shall be compiled into a library
-- : symbolically named IEEE.
-- :
-- Developers: IEEE model standards group (PAR 1164),
-- : Accellera VHDL-TC, and IEEE P1076 Working Group
-- :
-- Purpose : This packages defines a standard for designers
-- : to use in describing the interconnection data types
-- : used in vhdl modeling.
-- :
-- Limitation: The logic system defined in this package may
-- : be insufficient for modeling switched transistors,
-- : since such a requirement is out of the scope of this
-- : effort. Furthermore, mathematics, primitives,
-- : timing standards, etc. are considered orthogonal
-- : issues as it relates to this package and are therefore
-- : beyond the scope of this effort.
-- :
-- Note : This package may be modified to include additional data
-- : required by tools, but it must in no way change the
-- : external interfaces or simulation behavior of the
-- : description. It is permissible to add comments and/or
-- : attributes to the package declarations, but not to change
-- : or delete any original lines of the package declaration.
-- : The package body may be changed only in accordance with
-- : the terms of Clause 16 of this standard.
-- :
-- --------------------------------------------------------------------
-- $Revision: 1220 $
-- $Date: 2008-04-10 17:16:09 +0930 (Thu, 10 Apr 2008) $
-- --------------------------------------------------------------------
use STD.TEXTIO.all;
package std_logic_1164 is
-------------------------------------------------------------------
-- logic state system (unresolved)
-------------------------------------------------------------------
type STD_ULOGIC is ( 'U', -- Uninitialized
'X', -- Forcing Unknown
'0', -- Forcing 0
'1', -- Forcing 1
'Z', -- High Impedance
'W', -- Weak Unknown
'L', -- Weak 0
'H', -- Weak 1
'-' -- Don't care
);
-------------------------------------------------------------------
-- unconstrained array of std_ulogic for use with the resolution function
-- and for use in declaring signal arrays of unresolved elements
-------------------------------------------------------------------
type STD_ULOGIC_VECTOR is array (NATURAL range <>) of STD_ULOGIC;
-------------------------------------------------------------------
-- resolution function
-------------------------------------------------------------------
function resolved (s : STD_ULOGIC_VECTOR) return STD_ULOGIC;
-------------------------------------------------------------------
-- logic state system (resolved)
-------------------------------------------------------------------
subtype STD_LOGIC is resolved STD_ULOGIC;
-------------------------------------------------------------------
-- unconstrained array of resolved std_ulogic for use in declaring
-- signal arrays of resolved elements
-------------------------------------------------------------------
subtype STD_LOGIC_VECTOR is (resolved) STD_ULOGIC_VECTOR;
-------------------------------------------------------------------
-- common subtypes
-------------------------------------------------------------------
subtype X01 is resolved STD_ULOGIC range 'X' to '1'; -- ('X','0','1')
subtype X01Z is resolved STD_ULOGIC range 'X' to 'Z'; -- ('X','0','1','Z')
subtype UX01 is resolved STD_ULOGIC range 'U' to '1'; -- ('U','X','0','1')
subtype UX01Z is resolved STD_ULOGIC range 'U' to 'Z'; -- ('U','X','0','1','Z')
-------------------------------------------------------------------
-- overloaded logical operators
-------------------------------------------------------------------
function "and" (l : STD_ULOGIC; r : STD_ULOGIC) return UX01;
function "nand" (l : STD_ULOGIC; r : STD_ULOGIC) return UX01;
function "or" (l : STD_ULOGIC; r : STD_ULOGIC) return UX01;
function "nor" (l : STD_ULOGIC; r : STD_ULOGIC) return UX01;
function "xor" (l : STD_ULOGIC; r : STD_ULOGIC) return UX01;
function "xnor" (l : STD_ULOGIC; r : STD_ULOGIC) return ux01;
function "not" (l : STD_ULOGIC) return UX01;
-------------------------------------------------------------------
-- vectorized overloaded logical operators
-------------------------------------------------------------------
function "and" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "nand" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "or" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "nor" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "xor" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "xnor" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "not" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "and" (l : STD_ULOGIC_VECTOR; r : STD_ULOGIC) return STD_ULOGIC_VECTOR;
function "and" (l : STD_ULOGIC; r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "nand" (l : STD_ULOGIC_VECTOR; r : STD_ULOGIC) return STD_ULOGIC_VECTOR;
function "nand" (l : STD_ULOGIC; r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "or" (l : STD_ULOGIC_VECTOR; r : STD_ULOGIC) return STD_ULOGIC_VECTOR;
function "or" (l : STD_ULOGIC; r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "nor" (l : STD_ULOGIC_VECTOR; r : STD_ULOGIC) return STD_ULOGIC_VECTOR;
function "nor" (l : STD_ULOGIC; r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "xor" (l : STD_ULOGIC_VECTOR; r : STD_ULOGIC) return STD_ULOGIC_VECTOR;
function "xor" (l : STD_ULOGIC; r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "xnor" (l : STD_ULOGIC_VECTOR; r : STD_ULOGIC) return STD_ULOGIC_VECTOR;
function "xnor" (l : STD_ULOGIC; r : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function "and" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC;
function "nand" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC;
function "or" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC;
function "nor" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC;
function "xor" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC;
function "xnor" (l : STD_ULOGIC_VECTOR) return STD_ULOGIC;
-------------------------------------------------------------------
-- shift operators
-------------------------------------------------------------------
function "sll" (l : STD_ULOGIC_VECTOR; r : INTEGER) return STD_ULOGIC_VECTOR;
function "srl" (l : STD_ULOGIC_VECTOR; r : INTEGER) return STD_ULOGIC_VECTOR;
function "rol" (l : STD_ULOGIC_VECTOR; r : INTEGER) return STD_ULOGIC_VECTOR;
function "ror" (l : STD_ULOGIC_VECTOR; r : INTEGER) return STD_ULOGIC_VECTOR;
-------------------------------------------------------------------
-- conversion functions
-------------------------------------------------------------------
function To_bit (s : STD_ULOGIC; xmap : BIT := '0') return BIT;
function To_bitvector (s : STD_ULOGIC_VECTOR; xmap : BIT := '0') return BIT_VECTOR;
function To_StdULogic (b : BIT) return STD_ULOGIC;
function To_StdLogicVector (b : BIT_VECTOR) return STD_LOGIC_VECTOR;
function To_StdLogicVector (s : STD_ULOGIC_VECTOR) return STD_LOGIC_VECTOR;
function To_StdULogicVector (b : BIT_VECTOR) return STD_ULOGIC_VECTOR;
function To_StdULogicVector (s : STD_LOGIC_VECTOR) return STD_ULOGIC_VECTOR;
alias To_Bit_Vector is
To_bitvector[STD_ULOGIC_VECTOR, BIT return BIT_VECTOR];
alias To_BV is
To_bitvector[STD_ULOGIC_VECTOR, BIT return BIT_VECTOR];
alias To_Std_Logic_Vector is
To_StdLogicVector[BIT_VECTOR return STD_LOGIC_VECTOR];
alias To_SLV is
To_StdLogicVector[BIT_VECTOR return STD_LOGIC_VECTOR];
alias To_Std_Logic_Vector is
To_StdLogicVector[STD_ULOGIC_VECTOR return STD_LOGIC_VECTOR];
alias To_SLV is
To_StdLogicVector[STD_ULOGIC_VECTOR return STD_LOGIC_VECTOR];
alias To_Std_ULogic_Vector is
To_StdULogicVector[BIT_VECTOR return STD_ULOGIC_VECTOR];
alias To_SULV is
To_StdULogicVector[BIT_VECTOR return STD_ULOGIC_VECTOR];
alias To_Std_ULogic_Vector is
To_StdULogicVector[STD_LOGIC_VECTOR return STD_ULOGIC_VECTOR];
alias To_SULV is
To_StdULogicVector[STD_LOGIC_VECTOR return STD_ULOGIC_VECTOR];
-------------------------------------------------------------------
-- strength strippers and type convertors
-------------------------------------------------------------------
function TO_01 (s : STD_ULOGIC_VECTOR; xmap : STD_ULOGIC := '0')
return STD_ULOGIC_VECTOR;
function TO_01 (s : STD_ULOGIC; xmap : STD_ULOGIC := '0')
return STD_ULOGIC;
function TO_01 (s : BIT_VECTOR; xmap : STD_ULOGIC := '0')
return STD_ULOGIC_VECTOR;
function TO_01 (s : BIT; xmap : STD_ULOGIC := '0')
return STD_ULOGIC;
function To_X01 (s : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function To_X01 (s : STD_ULOGIC) return X01;
function To_X01 (b : BIT_VECTOR) return STD_ULOGIC_VECTOR;
function To_X01 (b : BIT) return X01;
function To_X01Z (s : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function To_X01Z (s : STD_ULOGIC) return X01Z;
function To_X01Z (b : BIT_VECTOR) return STD_ULOGIC_VECTOR;
function To_X01Z (b : BIT) return X01Z;
function To_UX01 (s : STD_ULOGIC_VECTOR) return STD_ULOGIC_VECTOR;
function To_UX01 (s : STD_ULOGIC) return UX01;
function To_UX01 (b : BIT_VECTOR) return STD_ULOGIC_VECTOR;
function To_UX01 (b : BIT) return UX01;
function "??" (l : STD_ULOGIC) return BOOLEAN;
-------------------------------------------------------------------
-- edge detection
-------------------------------------------------------------------
function rising_edge (signal s : STD_ULOGIC) return BOOLEAN;
function falling_edge (signal s : STD_ULOGIC) return BOOLEAN;
-------------------------------------------------------------------
-- object contains an unknown
-------------------------------------------------------------------
function Is_X (s : STD_ULOGIC_VECTOR) return BOOLEAN;
function Is_X (s : STD_ULOGIC) return BOOLEAN;
-------------------------------------------------------------------
-- matching relational operators
-------------------------------------------------------------------
-- the following operations are predefined
-- function "?=" (l, r : STD_ULOGIC) return STD_ULOGIC;
-- function "?=" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC;
-- function "?/=" (l, r : STD_ULOGIC) return STD_ULOGIC;
-- function "?/=" (l, r : STD_ULOGIC_VECTOR) return STD_ULOGIC;
-- function "?<" (l, r : STD_ULOGIC) return STD_ULOGIC;
-- function "?<=" (l, r : STD_ULOGIC) return STD_ULOGIC;
-- function "?>" (l, r : STD_ULOGIC) return STD_ULOGIC;
-- function "?>=" (l, r : STD_ULOGIC) return STD_ULOGIC;
-------------------------------------------------------------------
-- string conversion and write operations
-------------------------------------------------------------------
-- the following operations are predefined
-- function to_string (value : STD_ULOGIC) return STRING;
-- function to_string (value : STD_ULOGIC_VECTOR) return STRING;
-- explicitly defined operations
alias TO_BSTRING is TO_STRING [STD_ULOGIC_VECTOR return STRING];
alias TO_BINARY_STRING is TO_STRING [STD_ULOGIC_VECTOR return STRING];
function TO_OSTRING (VALUE : STD_ULOGIC_VECTOR) return STRING;
alias TO_OCTAL_STRING is TO_OSTRING [STD_ULOGIC_VECTOR return STRING];
function TO_HSTRING (VALUE : STD_ULOGIC_VECTOR) return STRING;
alias TO_HEX_STRING is TO_HSTRING [STD_ULOGIC_VECTOR return STRING];
procedure READ (L : inout LINE; VALUE : out STD_ULOGIC; GOOD : out BOOLEAN);
procedure READ (L : inout LINE; VALUE : out STD_ULOGIC);
procedure READ (L : inout LINE; VALUE : out STD_ULOGIC_VECTOR; GOOD : out BOOLEAN);
procedure READ (L : inout LINE; VALUE : out STD_ULOGIC_VECTOR);
procedure WRITE (L : inout LINE; VALUE : in STD_ULOGIC;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
procedure WRITE (L : inout LINE; VALUE : in STD_ULOGIC_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias BREAD is READ [LINE, STD_ULOGIC_VECTOR, BOOLEAN];
alias BREAD is READ [LINE, STD_ULOGIC_VECTOR];
alias BINARY_READ is READ [LINE, STD_ULOGIC_VECTOR, BOOLEAN];
alias BINARY_READ is READ [LINE, STD_ULOGIC_VECTOR];
procedure OREAD (L : inout LINE; VALUE : out STD_ULOGIC_VECTOR; GOOD : out BOOLEAN);
procedure OREAD (L : inout LINE; VALUE : out STD_ULOGIC_VECTOR);
alias OCTAL_READ is OREAD [LINE, STD_ULOGIC_VECTOR, BOOLEAN];
alias OCTAL_READ is OREAD [LINE, STD_ULOGIC_VECTOR];
procedure HREAD (L : inout LINE; VALUE : out STD_ULOGIC_VECTOR; GOOD : out BOOLEAN);
procedure HREAD (L : inout LINE; VALUE : out STD_ULOGIC_VECTOR);
alias HEX_READ is HREAD [LINE, STD_ULOGIC_VECTOR, BOOLEAN];
alias HEX_READ is HREAD [LINE, STD_ULOGIC_VECTOR];
alias BWRITE is WRITE [LINE, STD_ULOGIC_VECTOR, SIDE, WIDTH];
alias BINARY_WRITE is WRITE [LINE, STD_ULOGIC_VECTOR, SIDE, WIDTH];
procedure OWRITE (L : inout LINE; VALUE : in STD_ULOGIC_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias OCTAL_WRITE is OWRITE [LINE, STD_ULOGIC_VECTOR, SIDE, WIDTH];
procedure HWRITE (L : inout LINE; VALUE : in STD_ULOGIC_VECTOR;
JUSTIFIED : in SIDE := right; FIELD : in WIDTH := 0);
alias HEX_WRITE is HWRITE [LINE, STD_ULOGIC_VECTOR, SIDE, WIDTH];
end package std_logic_1164;
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