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vhdl/lib/Standard/ieee/add/numeric_std_additions.vhdl
T
jens e17a1eefb5 - initial version 
git-svn-id: http://moon:8086/svn/vhdl/trunk@1073 cc03376c-175c-47c8-b038-4cd826a8556b
2015-02-07 06:35:28 +00:00

2641 lines
84 KiB
VHDL
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------------------------------------------------------------------------------
-- "numeric_std_additions" package contains the additions to the standard
-- "numeric_std" package proposed by the VHDL-200X-ft working group.
-- This package should be compiled into "ieee_proposed" and used as follows:
-- use ieee.std_logic_1164.all;
-- use ieee.numeric_std.all;
-- use ieee_proposed.numeric_std_additions.all;
-- (this package is independant of "std_logic_1164_additions")
-- Last Modified: $Date: 2006-03-22 16:28:26-05 $
-- RCS ID: $Id: numeric_std_additions.vhd,v 1.6 2006-03-22 16:28:26-05 l435385 Exp $
--
-- Created for VHDL-200X par, David Bishop (dbishop@vhdl.org)
------------------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use std.textio.all;
package numeric_std_additions is
-- Id: A.3R
function "+"(L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- Result subtype: UNSIGNED(L'RANGE)
-- Result: Similar to A.3 where R is a one bit UNSIGNED
-- Id: A.3L
function "+"(L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'RANGE)
-- Result: Similar to A.3 where L is a one bit UNSIGNED
-- Id: A.4R
function "+"(L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- Result subtype: SIGNED(L'RANGE)
-- Result: Similar to A.4 where R is bit 0 of a non-negative
-- SIGNED
-- Id: A.4L
function "+"(L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- Result subtype: UNSIGNED(R'RANGE)
-- Result: Similar to A.4 where L is bit 0 of a non-negative
-- SIGNED
-- Id: A.9R
function "-"(L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- Result subtype: UNSIGNED(L'RANGE)
-- Result: Similar to A.9 where R is a one bit UNSIGNED
-- Id: A.9L
function "-"(L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- Result subtype: UNSIGNED(R'RANGE)
-- Result: Similar to A.9 where L is a one bit UNSIGNED
-- Id: A.10R
function "-"(L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- Result subtype: SIGNED(L'RANGE)
-- Result: Similar to A.10 where R is bit 0 of a non-negative
-- SIGNED
-- Id: A.10L
function "-"(L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- Result subtype: UNSIGNED(R'RANGE)
-- Result: Similar to A.10 where R is bit 0 of a non-negative
-- SIGNED
function RESIZE (ARG, SIZE_RES : SIGNED) return SIGNED;
-- size_res version, uses the size of the "size_res" input
-- to resize the output
function RESIZE (ARG, SIZE_RES : UNSIGNED) return UNSIGNED;
-- size_res version, uses the size of the "size_res" input
-- to resize the output
function TO_UNSIGNED (ARG : NATURAL; SIZE_RES : UNSIGNED) return UNSIGNED;
-- size_res version, uses the size of the "size_res" input
-- to resize the output
function TO_SIGNED (ARG : INTEGER; SIZE_RES : SIGNED) return SIGNED;
-- size_res version, uses the size of the "size_res" input
-- to resize the output
-- Id: M.2B
-- %%% function "?=" (L, R : UNSIGNED) return std_ulogic;
-- %%% function "?/=" (L, R : UNSIGNED) return std_ulogic;
-- %%% function "?>" (L, R : UNSIGNED) return std_ulogic;
-- %%% function "?>=" (L, R : UNSIGNED) return std_ulogic;
-- %%% function "?<" (L, R : UNSIGNED) return std_ulogic;
-- %%% function "?<=" (L, R : UNSIGNED) return std_ulogic;
function \?=\ (L, R : UNSIGNED) return std_ulogic;
function \?/=\ (L, R : UNSIGNED) return std_ulogic;
function \?>\ (L, R : UNSIGNED) return std_ulogic;
function \?>=\ (L, R : UNSIGNED) return std_ulogic;
function \?<\ (L, R : UNSIGNED) return std_ulogic;
function \?<=\ (L, R : UNSIGNED) return std_ulogic;
-- Result subtype: STD_ULOGIC
-- Result: terms compared per STD_LOGIC_1164 intent,
-- returns an 'X' if a metavalue is passed
-- Id: M.3B
-- %%% function "?=" (L, R : SIGNED) return std_ulogic;
-- %%% function "?/=" (L, R : SIGNED) return std_ulogic;
-- %%% function "?>" (L, R : SIGNED) return std_ulogic;
-- %%% function "?>=" (L, R : SIGNED) return std_ulogic;
-- %%% function "?<" (L, R : SIGNED) return std_ulogic;
-- %%% function "?<=" (L, R : SIGNED) return std_ulogic;
function \?=\ (L, R : SIGNED) return std_ulogic;
function \?/=\ (L, R : SIGNED) return std_ulogic;
function \?>\ (L, R : SIGNED) return std_ulogic;
function \?>=\ (L, R : SIGNED) return std_ulogic;
function \?<\ (L, R : SIGNED) return std_ulogic;
function \?<=\ (L, R : SIGNED) return std_ulogic;
-- Result subtype: std_ulogic
-- Result: terms compared per STD_LOGIC_1164 intent,
-- returns an 'X' if a metavalue is passed
-----------------------------------------------------------------------------
-- New/updated funcitons for VHDL-200X fast track
-----------------------------------------------------------------------------
-- add_carry procedures, to provide a carry in and a carry out
procedure add_carry (
L, R : in UNSIGNED;
c_in : in STD_ULOGIC;
result : out UNSIGNED;
c_out : out STD_ULOGIC);
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Procedure takes a carry in into the adder, and provides a carry out.
procedure add_carry (
L, R : in SIGNED;
c_in : in STD_ULOGIC;
result : out SIGNED;
c_out : out STD_ULOGIC);
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Procedure takes a carry in into the adder, and provides a carry out.
-- Overloaded functions from "std_logic_1164"
function To_X01 (s : UNSIGNED) return UNSIGNED;
function To_X01 (s : SIGNED) return SIGNED;
function To_X01Z (s : UNSIGNED) return UNSIGNED;
function To_X01Z (s : SIGNED) return SIGNED;
function To_UX01 (s : UNSIGNED) return UNSIGNED;
function To_UX01 (s : SIGNED) return SIGNED;
function Is_X (s : UNSIGNED) return BOOLEAN;
function Is_X (s : SIGNED) return BOOLEAN;
function "sla" (ARG : SIGNED; COUNT : INTEGER) return SIGNED;
function "sla" (ARG : UNSIGNED; COUNT : INTEGER) return UNSIGNED;
function "sra" (ARG : SIGNED; COUNT : INTEGER) return SIGNED;
function "sra" (ARG : UNSIGNED; COUNT : INTEGER) return UNSIGNED;
-- New conversion functions, these drop or add sign bits only
function remove_sign (arg : SIGNED) return UNSIGNED;
function add_sign (arg : UNSIGNED) return SIGNED;
-- Returns the maximum (or minimum) of the two numbers provided.
-- All types (both inputs and the output) must be the same.
-- These override the implicit funcitons, using the local ">" operator
function maximum (
l, r : UNSIGNED) -- inputs
return UNSIGNED;
function maximum (
l, r : SIGNED) -- inputs
return SIGNED;
function minimum (
l, r : UNSIGNED) -- inputs
return UNSIGNED;
function minimum (
l, r : SIGNED) -- inputs
return SIGNED;
-- Finds the first "Y" in the input string. Returns an integer index
-- into that string. If "Y" does not exist in the string, then the
-- "find_lsb" returns arg'low -1, and "find_msb" returns -1
function find_lsb (
arg : UNSIGNED; -- vector argument
y : STD_ULOGIC) -- look for this bit
return INTEGER;
function find_lsb (
arg : SIGNED; -- vector argument
y : STD_ULOGIC) -- look for this bit
return INTEGER;
function find_msb (
arg : UNSIGNED; -- vector argument
y : STD_ULOGIC) -- look for this bit
return INTEGER;
function find_msb (
arg : SIGNED; -- vector argument
y : STD_ULOGIC) -- look for this bit
return INTEGER;
-- L.15
function "and" (L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- L.16
function "and" (L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- L.17
function "or" (L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- L.18
function "or" (L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- L.19
function "nand" (L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- L.20
function "nand" (L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- L.21
function "nor" (L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- L.22
function "nor" (L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- L.23
function "xor" (L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- L.24
function "xor" (L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- L.25
function "xnor" (L : STD_ULOGIC; R : UNSIGNED) return UNSIGNED;
-- L.26
function "xnor" (L : UNSIGNED; R : STD_ULOGIC) return UNSIGNED;
-- L.27
function "and" (L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- L.28
function "and" (L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- L.29
function "or" (L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- L.30
function "or" (L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- L.31
function "nand" (L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- L.32
function "nand" (L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- L.33
function "nor" (L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- L.34
function "nor" (L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- L.35
function "xor" (L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- L.36
function "xor" (L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- L.37
function "xnor" (L : STD_ULOGIC; R : SIGNED) return SIGNED;
-- L.38
function "xnor" (L : SIGNED; R : STD_ULOGIC) return SIGNED;
-- %%% remove 12 functions (old syntax)
function and_reduce(arg : SIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of and'ing all of the bits of the vector.
function nand_reduce(arg : SIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of nand'ing all of the bits of the vector.
function or_reduce(arg : SIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of or'ing all of the bits of the vector.
function nor_reduce(arg : SIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of nor'ing all of the bits of the vector.
function xor_reduce(arg : SIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of xor'ing all of the bits of the vector.
function xnor_reduce(arg : SIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of xnor'ing all of the bits of the vector.
function and_reduce(arg : UNSIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of and'ing all of the bits of the vector.
function nand_reduce(arg : UNSIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of nand'ing all of the bits of the vector.
function or_reduce(arg : UNSIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of or'ing all of the bits of the vector.
function nor_reduce(arg : UNSIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of nor'ing all of the bits of the vector.
function xor_reduce(arg : UNSIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of xor'ing all of the bits of the vector.
function xnor_reduce(arg : UNSIGNED) return STD_ULOGIC;
-- Result subtype: STD_LOGIC.
-- Result: Result of xnor'ing all of the bits of the vector.
-- %%% Uncomment the following 12 functions (new syntax)
-- function "and" ( arg : SIGNED ) RETURN std_ulogic;
-- function "nand" ( arg : SIGNED ) RETURN std_ulogic;
-- function "or" ( arg : SIGNED ) RETURN std_ulogic;
-- function "nor" ( arg : SIGNED ) RETURN std_ulogic;
-- function "xor" ( arg : SIGNED ) RETURN std_ulogic;
-- function "xnor" ( arg : SIGNED ) RETURN std_ulogic;
-- function "and" ( arg : UNSIGNED ) RETURN std_ulogic;
-- function "nand" ( arg : UNSIGNED ) RETURN std_ulogic;
-- function "or" ( arg : UNSIGNED ) RETURN std_ulogic;
-- function "nor" ( arg : UNSIGNED ) RETURN std_ulogic;
-- function "xor" ( arg : UNSIGNED ) RETURN std_ulogic;
-- function "xnor" ( arg : UNSIGNED ) RETURN std_ulogic;
-- rtl_synthesis off
-------------------------------------------------------------------
-- string functions
-------------------------------------------------------------------
function to_string (
value : in SIGNED;
justified : in SIDE := right;
field : in width := 0
) return STRING;
function to_bstring (
value : in SIGNED;
justified : in side := RIGHT;
field : in width := 0
) return string;
function to_hstring (
value : in SIGNED;
justified : in SIDE := right;
field : in width := 0
) return STRING;
function to_ostring (
value : in SIGNED;
justified : in SIDE := right;
field : in width := 0
) return STRING;
function to_string (
value : in UNSIGNED;
justified : in SIDE := right;
field : in width := 0
) return STRING;
function to_bstring (
value : in UNSIGNED;
justified : in side := RIGHT;
field : in width := 0
) return string;
function to_hstring (
value : in UNSIGNED;
justified : in SIDE := right;
field : in width := 0
) return STRING;
function to_ostring (
value : in UNSIGNED;
justified : in SIDE := right;
field : in width := 0
) return STRING;
-----------------------------------------------------------------------------
-- Read and Write routines
-----------------------------------------------------------------------------
procedure WRITE (
L : inout LINE; -- input line
VALUE : in SIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure READ(L : inout LINE;
VALUE : out SIGNED);
procedure READ(L : inout LINE;
VALUE : out SIGNED;
GOOD : out BOOLEAN);
procedure WRITE (
L : inout LINE; -- input line
VALUE : in UNSIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure READ(L : inout LINE;
VALUE : out UNSIGNED);
procedure READ(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN);
-- alias bread is read [line, SIGNED, BOOLEAN] ;
-- alias bread is read [line, SIGNED] ;
-- alias bwrite is write [line, SIGNED, side, width];
-- alias bread is read [line, UNSIGNED, BOOLEAN] ;
-- alias bread is read [line, UNSIGNED] ;
-- alias bwrite is write [line, UNSIGNED, side, width];
procedure BWRITE (
L : inout LINE; -- input line
VALUE : in SIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure BREAD(L : inout LINE;
VALUE : out SIGNED);
procedure BREAD(L : inout LINE;
VALUE : out SIGNED;
GOOD : out BOOLEAN);
procedure BWRITE (
L : inout LINE; -- input line
VALUE : in UNSIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure BREAD(L : inout LINE;
VALUE : out UNSIGNED);
procedure BREAD(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN);
-- Hex and Octal read and write, originally from "std_logic_textio",
-- these procedures have been modified to be more forgiving.
procedure HWRITE (
L : inout LINE; -- input line
VALUE : in SIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure HREAD(L : inout LINE;
VALUE : out SIGNED);
procedure HREAD(L : inout LINE;
VALUE : out SIGNED;
GOOD : out BOOLEAN);
procedure HWRITE (
L : inout LINE; -- input line
VALUE : in UNSIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure HREAD(L : inout LINE;
VALUE : out UNSIGNED);
procedure HREAD(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN);
procedure OWRITE (
L : inout LINE; -- input line
VALUE : in SIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure OREAD(L : inout LINE;
VALUE : out SIGNED);
procedure OREAD(L : inout LINE;
VALUE : out SIGNED;
GOOD : out BOOLEAN);
procedure OWRITE (
L : inout LINE; -- input line
VALUE : in UNSIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0);
procedure OREAD(L : inout LINE;
VALUE : out UNSIGNED);
procedure OREAD(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN);
-- rtl_synthesis on
end package numeric_std_additions;
package body numeric_std_additions is
constant NAU : UNSIGNED(0 downto 1) := (others => '0');
constant NAS : SIGNED(0 downto 1) := (others => '0');
constant NO_WARNING : BOOLEAN := FALSE; -- default to emit warnings
function MAX (LEFT, RIGHT : INTEGER) return INTEGER is
begin
if LEFT > RIGHT then return LEFT;
else return RIGHT;
end if;
end function MAX;
-- Id: A.3R
function "+"(L : UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
variable XR : UNSIGNED(L'LENGTH-1 downto 0) := (others => '0');
begin
XR(0) := R;
return (L + XR);
end function "+";
-- Id: A.3L
function "+"(L : STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
variable XL : UNSIGNED(R'LENGTH-1 downto 0) := (others => '0');
begin
XL(0) := L;
return (XL + R);
end function "+";
-- Id: A.4R
function "+"(L : SIGNED; R: STD_ULOGIC) return SIGNED is
variable XR : SIGNED(L'LENGTH-1 downto 0) := (others => '0');
begin
XR(0) := R;
return (L + XR);
end function "+";
-- Id: A.4L
function "+"(L : STD_ULOGIC; R: SIGNED) return SIGNED is
variable XL : SIGNED(R'LENGTH-1 downto 0) := (others => '0');
begin
XL(0) := L;
return (XL + R);
end function "+";
-- Id: A.9R
function "-"(L : UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
variable XR : UNSIGNED(L'LENGTH-1 downto 0) := (others => '0');
begin
XR(0) := R;
return (L - XR);
end function "-";
-- Id: A.9L
function "-"(L : STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
variable XL : UNSIGNED(R'LENGTH-1 downto 0) := (others => '0');
begin
XL(0) := L;
return (XL - R);
end function "-";
-- Id: A.10R
function "-"(L : SIGNED; R: STD_ULOGIC) return SIGNED is
variable XR : SIGNED(L'LENGTH-1 downto 0) := (others => '0');
begin
XR(0) := R;
return (L - XR);
end function "-";
-- Id: A.10L
function "-"(L : STD_ULOGIC; R: SIGNED) return SIGNED is
variable XL : SIGNED(R'LENGTH-1 downto 0) := (others => '0');
begin
XL(0) := L;
return (XL - R);
end function "-";
function RESIZE (ARG, SIZE_RES : SIGNED) return SIGNED is
begin
if (SIZE_RES'length = 0) then
return NAS;
else
return resize (ARG, SIZE_RES'length);
end if;
end function RESIZE;
function RESIZE (ARG, SIZE_RES : UNSIGNED) return UNSIGNED is
begin
if (SIZE_RES'length = 0) then
return NAU;
else
return resize (ARG, SIZE_RES'length);
end if;
end function RESIZE;
function TO_UNSIGNED (ARG : NATURAL; SIZE_RES : UNSIGNED) return UNSIGNED is
begin
if (SIZE_RES'length = 0) then
return NAU;
else
return TO_UNSIGNED (ARG, SIZE_RES'length);
end if;
end function TO_UNSIGNED;
function TO_SIGNED (ARG : INTEGER; SIZE_RES : SIGNED) return SIGNED is
begin
if (SIZE_RES'length = 0) then
return NAS;
else
return TO_SIGNED (ARG, SIZE_RES'length);
end if;
end function TO_SIGNED;
TYPE stdlogic_table IS ARRAY(std_ulogic, std_ulogic) OF std_ulogic;
CONSTANT match_logic_table : stdlogic_table := (
-----------------------------------------------------
-- U X 0 1 Z W L H - | |
-----------------------------------------------------
( 'U', 'U', 'U', 'U', 'U', 'U', 'U', 'U', '1' ), -- | U |
( 'U', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '1' ), -- | X |
( 'U', 'X', '1', '0', 'X', 'X', '1', '0', '1' ), -- | 0 |
( 'U', 'X', '0', '1', 'X', 'X', '0', '1', '1' ), -- | 1 |
( 'U', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '1' ), -- | Z |
( 'U', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '1' ), -- | W |
( 'U', 'X', '1', '0', 'X', 'X', '1', '0', '1' ), -- | L |
( 'U', 'X', '0', '1', 'X', 'X', '0', '1', '1' ), -- | H |
( '1', '1', '1', '1', '1', '1', '1', '1', '1' ) -- | - |
);
constant no_match_logic_table : stdlogic_table := (
-----------------------------------------------------
-- U X 0 1 Z W L H - | |
-----------------------------------------------------
('U', 'U', 'U', 'U', 'U', 'U', 'U', 'U', '0'), -- | U |
('U', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '0'), -- | X |
('U', 'X', '0', '1', 'X', 'X', '0', '1', '0'), -- | 0 |
('U', 'X', '1', '0', 'X', 'X', '1', '0', '0'), -- | 1 |
('U', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '0'), -- | Z |
('U', 'X', 'X', 'X', 'X', 'X', 'X', 'X', '0'), -- | W |
('U', 'X', '0', '1', 'X', 'X', '0', '1', '0'), -- | L |
('U', 'X', '1', '0', 'X', 'X', '1', '0', '0'), -- | H |
('0', '0', '0', '0', '0', '0', '0', '0', '0') -- | - |
);
-- %%% FUNCTION "?=" ( l, r : std_ulogic ) RETURN std_ulogic IS
FUNCTION \?=\ ( l, r : std_ulogic ) RETURN std_ulogic IS
VARIABLE value : std_ulogic;
BEGIN
RETURN match_logic_table (l, r);
END FUNCTION \?=\;
function \?/=\ (l, r : STD_ULOGIC) return STD_ULOGIC is
begin
return no_match_logic_table (l, r);
end function \?/=\;
-- "?=" operator is similar to "std_match", but returns a std_ulogic..
-- Id: M.2B
function \?=\ (L, R: UNSIGNED) return STD_ULOGIC is
constant L_LEFT : INTEGER := L'LENGTH-1;
constant R_LEFT : INTEGER := R'LENGTH-1;
alias XL : UNSIGNED(L_LEFT downto 0) is L;
alias XR : UNSIGNED(R_LEFT downto 0) is R;
constant SIZE : NATURAL := MAX(L'LENGTH, R'LENGTH);
variable LX : UNSIGNED(SIZE-1 downto 0);
variable RX : UNSIGNED(SIZE-1 downto 0);
variable result, result1 : STD_ULOGIC; -- result
begin
-- Logically identical to an "=" operator.
if ((L'LENGTH < 1) or (R'LENGTH < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?="": null detected, returning X"
severity warning;
return 'X';
else
LX := RESIZE(XL, SIZE);
RX := RESIZE(XR, SIZE);
result := '1';
for i in LX'low to LX'high loop
result1 := \?=\(LX(i), RX(i));
if result1 = 'U' then
return 'U';
elsif result1 = 'X' or result = 'X' then
result := 'X';
else
result := result and result1;
end if;
end loop;
return result;
end if;
end function \?=\;
-- %%% Replace with the following function
-- function "?=" (L, R: UNSIGNED) return std_ulogic is
-- end function "?=";
-- Id: M.3B
function \?=\ (L, R: SIGNED) return std_ulogic is
constant L_LEFT : INTEGER := L'LENGTH-1;
constant R_LEFT : INTEGER := R'LENGTH-1;
alias XL : SIGNED(L_LEFT downto 0) is L;
alias XR : SIGNED(R_LEFT downto 0) is R;
constant SIZE : NATURAL := MAX(L'LENGTH, R'LENGTH);
variable LX : SIGNED(SIZE-1 downto 0);
variable RX : SIGNED(SIZE-1 downto 0);
variable result, result1 : STD_ULOGIC; -- result
begin -- ?=
if ((L'LENGTH < 1) or (R'LENGTH < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?="": null detected, returning X"
severity warning;
return 'X';
else
LX := RESIZE(XL, SIZE);
RX := RESIZE(XR, SIZE);
result := '1';
for i in LX'low to LX'high loop
result1 := \?=\ (LX(i), RX(i));
if result1 = 'U' then
return 'U';
elsif result1 = 'X' or result = 'X' then
result := 'X';
else
result := result and result1;
end if;
end loop;
return result;
end if;
end function \?=\;
-- %%% Replace with the following function
-- function "?=" (L, R: signed) return std_ulogic is
-- end function "?=";
function \?/=\ (L, R : UNSIGNED) return std_ulogic is
constant L_LEFT : INTEGER := L'LENGTH-1;
constant R_LEFT : INTEGER := R'LENGTH-1;
alias XL : UNSIGNED(L_LEFT downto 0) is L;
alias XR : UNSIGNED(R_LEFT downto 0) is R;
constant SIZE : NATURAL := MAX(L'LENGTH, R'LENGTH);
variable LX : UNSIGNED(SIZE-1 downto 0);
variable RX : UNSIGNED(SIZE-1 downto 0);
variable result, result1 : STD_ULOGIC; -- result
begin -- ?=
if ((L'LENGTH < 1) or (R'LENGTH < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?/="": null detected, returning X"
severity warning;
return 'X';
else
LX := RESIZE(XL, SIZE);
RX := RESIZE(XR, SIZE);
result := '0';
for i in LX'low to LX'high loop
result1 := \?/=\ (LX(i), RX(i));
if result1 = 'U' then
return 'U';
elsif result1 = 'X' or result = 'X' then
result := 'X';
else
result := result or result1;
end if;
end loop;
return result;
end if;
end function \?/=\;
-- %%% function "?/=" (L, R : UNSIGNED) return std_ulogic is
-- %%% end function "?/=";
function \?/=\ (L, R : SIGNED) return std_ulogic is
constant L_LEFT : INTEGER := L'LENGTH-1;
constant R_LEFT : INTEGER := R'LENGTH-1;
alias XL : SIGNED(L_LEFT downto 0) is L;
alias XR : SIGNED(R_LEFT downto 0) is R;
constant SIZE : NATURAL := MAX(L'LENGTH, R'LENGTH);
variable LX : SIGNED(SIZE-1 downto 0);
variable RX : SIGNED(SIZE-1 downto 0);
variable result, result1 : STD_ULOGIC; -- result
begin -- ?=
if ((L'LENGTH < 1) or (R'LENGTH < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?/="": null detected, returning X"
severity warning;
return 'X';
else
LX := RESIZE(XL, SIZE);
RX := RESIZE(XR, SIZE);
result := '0';
for i in LX'low to LX'high loop
result1 := \?/=\ (LX(i), RX(i));
if result1 = 'U' then
return 'U';
elsif result1 = 'X' or result = 'X' then
result := 'X';
else
result := result or result1;
end if;
end loop;
return result;
end if;
end function \?/=\;
-- %%% function "?/=" (L, R : SIGNED) return std_ulogic is
-- %%% end function "?/=";
function \?>\ (L, R : UNSIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?>"": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?>"": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l > r then
return '1';
else
return '0';
end if;
end if;
end function \?>\;
-- %%% function "?>" (L, R : UNSIGNED) return std_ulogic is
-- %%% end function "?>"\;
function \?>\ (L, R : SIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?>"": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?>"": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l > r then
return '1';
else
return '0';
end if;
end if;
end function \?>\;
-- %%% function "?>" (L, R : SIGNED) return std_ulogic is
-- %%% end function "?>";
function \?>=\ (L, R : UNSIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?>="": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?>="": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l >= r then
return '1';
else
return '0';
end if;
end if;
end function \?>=\;
-- %%% function "?>=" (L, R : UNSIGNED) return std_ulogic is
-- %%% end function "?>=";
function \?>=\ (L, R : SIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?>="": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?>="": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l >= r then
return '1';
else
return '0';
end if;
end if;
end function \?>=\;
-- %%% function "?>=" (L, R : SIGNED) return std_ulogic is
-- %%% end function "?>=";
function \?<\ (L, R : UNSIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?<"": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?<"": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l < r then
return '1';
else
return '0';
end if;
end if;
end function \?<\;
-- %%% function "?<" (L, R : UNSIGNED) return std_ulogic is
-- %%% end function "?<";
function \?<\ (L, R : SIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?<"": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?<"": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l < r then
return '1';
else
return '0';
end if;
end if;
end function \?<\;
-- %%% function "?<" (L, R : SIGNED) return std_ulogic is
-- %%% end function "?<";
function \?<=\ (L, R : UNSIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?<="": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?<="": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l <= r then
return '1';
else
return '0';
end if;
end if;
end function \?<=\;
-- %%% function "?<=" (L, R : UNSIGNED) return std_ulogic is
-- %%% end function "?<=";
function \?<=\ (L, R : SIGNED) return std_ulogic is
begin
if ((l'length < 1) or (r'length < 1)) then
assert NO_WARNING
report "NUMERIC_STD.""?<="": null detected, returning X"
severity warning;
return 'X';
elsif (find_msb (l, '-') /= -1) or (find_msb (r, '-') /= -1) then
report "NUMERIC_STD.""?<="": '-' found in compare string"
severity error;
return 'X';
else
if is_x(l) or is_x(r) then
return 'X';
elsif l <= r then
return '1';
else
return '0';
end if;
end if;
end function \?<=\;
-- %%% function "?<=" (L, R : SIGNED) return std_ulogic is
-- %%% end function "?<=";
-- Result subtype: UNSIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Procedure takes a carry in into the adder, and provides a carry out.
procedure add_carry (
L, R : in UNSIGNED;
c_in : in STD_ULOGIC;
result : out UNSIGNED;
c_out : out STD_ULOGIC) is
constant SIZE : NATURAL := MAX(L'LENGTH, R'LENGTH);
variable L01 : UNSIGNED(SIZE downto 0);
variable R01 : UNSIGNED(SIZE downto 0);
variable res_big : UNSIGNED (SIZE downto 0); -- one bit too bit
begin
c_out := 'X'; -- default to X
if ((L'LENGTH < 1) or (R'LENGTH < 1)) then
result := NAU;
return;
end if;
L01 := TO_01(RESIZE(L, SIZE+1), 'X');
R01 := TO_01(RESIZE(R, SIZE+1), 'X');
if (to_X01(c_in) = 'X')
or (L01(L01'LEFT) = 'X') or (R01(R01'LEFT) = 'X') then
result (SIZE-1 downto 0) := (others => 'X');
return;
end if;
res_big := L01 + R01 + c_in;
c_out := res_big(SIZE);
result := res_big(SIZE-1 downto 0);
end procedure add_carry;
-- Result subtype: SIGNED(MAX(L'LENGTH, R'LENGTH)-1 downto 0).
-- Procedure takes a carry in into the adder, and provides a carry out.
procedure add_carry (
L, R : in SIGNED;
c_in : in STD_ULOGIC;
result : out SIGNED;
c_out : out STD_ULOGIC) is
constant SIZE : NATURAL := MAX(L'LENGTH, R'LENGTH);
variable L01 : SIGNED(SIZE downto 0);
variable R01 : SIGNED(SIZE downto 0);
variable res_big : SIGNED (SIZE downto 0);
begin
c_out := 'X'; -- default to X
if ((L'LENGTH < 1) or (R'LENGTH < 1)) then
result := NAS;
return;
end if;
L01 := TO_01(RESIZE(L, SIZE+1), 'X');
R01 := TO_01(RESIZE(R, SIZE+1), 'X');
if (to_X01(c_in) = 'X')
or (L01(L01'LEFT) = 'X') or (R01(R01'LEFT) = 'X') then
result (SIZE-1 downto 0) := (others => 'X');
return;
end if;
res_big := L01 + R01 + c_in;
c_out := res_big(size) xor res_big(size-1);
result := res_big(size-1 downto 0);
end procedure add_carry;
-- These functions are in std_logic_1164 and are defined for
-- std_logic_vector. They are overloaded here.
FUNCTION To_X01 ( s : UNSIGNED ) RETURN UNSIGNED is
BEGIN
return UNSIGNED (To_X01 (std_logic_vector (s)));
end function To_X01;
FUNCTION To_X01 ( s : SIGNED ) RETURN SIGNED is
BEGIN
return SIGNED (To_X01 (std_logic_vector (s)));
end function To_X01;
FUNCTION To_X01Z ( s : UNSIGNED ) RETURN UNSIGNED is
BEGIN
return UNSIGNED (To_X01Z (std_logic_vector (s)));
end function To_X01Z;
FUNCTION To_X01Z ( s : SIGNED ) RETURN SIGNED is
BEGIN
return SIGNED (To_X01Z (std_logic_vector (s)));
end function To_X01Z;
FUNCTION To_UX01 ( s : UNSIGNED ) RETURN UNSIGNED is
BEGIN
return UNSIGNED (To_UX01 (std_logic_vector (s)));
end function To_UX01;
FUNCTION To_UX01 ( s : SIGNED ) RETURN SIGNED is
BEGIN
return SIGNED (To_UX01 (std_logic_vector (s)));
end function To_UX01;
FUNCTION Is_X ( s : UNSIGNED ) RETURN BOOLEAN is
BEGIN
return Is_X (std_logic_vector (s));
end function Is_X;
FUNCTION Is_X ( s : SIGNED ) RETURN BOOLEAN is
BEGIN
return Is_X (std_logic_vector (s));
end function Is_X;
-- Arithmetic shifts
-- Functionality NOT the same as the std_logic_vector or bit vector version
function "sla" (ARG : SIGNED; COUNT : INTEGER) RETURN SIGNED is
begin
if (COUNT >= 0) then
return SHIFT_LEFT(ARG, COUNT);
else
return SHIFT_RIGHT(ARG, -COUNT);
end if;
end function "sla";
-- Functionality NOT the same as the std_logic_vector or bit vector version
function "sla" (ARG : UNSIGNED; COUNT : INTEGER) RETURN UNSIGNED is
begin
if (COUNT >= 0) then
return SHIFT_LEFT(ARG, COUNT);
else
return SHIFT_RIGHT(ARG, -COUNT);
end if;
end function "sla";
-- Functionality NOT the same as the std_logic_vector or bit vector version
function "sra" (ARG : SIGNED; COUNT : INTEGER) RETURN SIGNED is
begin
if (COUNT >= 0) then
return SHIFT_RIGHT(ARG, COUNT);
else
return SHIFT_LEFT(ARG, -COUNT);
end if;
end function "sra";
-- Functionality NOT the same as the std_logic_vector or bit vector version
function "sra" (ARG : UNSIGNED; COUNT : INTEGER) RETURN UNSIGNED is
begin
if (COUNT >= 0) then
return SHIFT_RIGHT(ARG, COUNT);
else
return SHIFT_LEFT(ARG, -COUNT);
end if;
end function "sra";
-----------------------------------------------------------------------------
-- New/updated functions for VHDL-200X fast track
-----------------------------------------------------------------------------
-- New conversion functions, these drop or add sign bits only
function remove_sign (arg : SIGNED) return UNSIGNED is
variable result : unsigned (arg'length-1 downto 0);
alias XARG : SIGNED(arg'length-1 downto 0) is ARG;
variable yarg : SIGNED (XARG'range);
begin
if arg'length < 1 then
return NAU;
end if;
if (to_x01(XARG(XARG'high)) = '1') then
yarg := abs (xarg);
else
yarg := to_x01(xarg);
end if;
result := unsigned(yarg);
return result;
end function remove_sign;
function add_sign (arg : UNSIGNED) return SIGNED is
variable result : signed (arg'length downto 0);
alias XARG : UNSIGNED(arg'length-1 downto 0) is ARG;
begin
if arg'length < 1 then
return NAS;
end if;
result := "0" & SIGNED (to_x01(XARG));
return result;
end function add_sign;
-- Returns the maximum (or minimum) of the two numbers provided.
-- All types (both inputs and the output) must be the same.
-- These override the implicit functions, using the local ">" operator
-- UNSIGNED output
function maximum (
l, r : UNSIGNED) -- inputs
return UNSIGNED is
begin -- function max
if l > r then return l;
else return r;
end if;
end function maximum;
-- signed output
function maximum (
l, r : signed) -- inputs
return signed is
begin -- function max
if l > r then return l;
else return r;
end if;
end function maximum;
-- UNSIGNED output
function minimum (
l, r : UNSIGNED) -- inputs
return UNSIGNED is
begin -- function minimum
if l < r then return l;
else return r;
end if;
end function minimum;
-- signed output
function minimum (
l, r : signed) -- inputs
return signed is
begin -- function minimum
if l < r then return l;
else return r;
end if;
end function minimum;
function find_lsb (
arg : UNSIGNED; -- vector argument
y : std_ulogic) -- look for this bit
return integer is
alias xarg : UNSIGNED(arg'length-1 downto 0) is arg;
begin
for_loop: for i in xarg'reverse_range loop
if xarg(i) = y then
return i;
end if;
end loop;
return -1;
end function find_lsb;
function find_lsb (
arg : signed; -- vector argument
y : std_ulogic) -- look for this bit
return integer is
alias xarg : SIGNED(arg'length-1 downto 0) is arg;
begin
for_loop: for i in xarg'reverse_range loop
if xarg(i) = y then
return i;
end if;
end loop;
return -1;
end function find_lsb;
function find_msb (
arg : UNSIGNED; -- vector argument
y : std_ulogic) -- look for this bit
return integer is
alias xarg : UNSIGNED(arg'length-1 downto 0) is arg;
begin
for_loop: for i in xarg'range loop
if xarg(i) = y then
return i;
end if;
end loop;
return -1;
end function find_msb;
function find_msb (
arg : signed; -- vector argument
y : std_ulogic) -- look for this bit
return integer is
alias xarg : SIGNED(arg'length-1 downto 0) is arg;
begin
for_loop: for i in xarg'range loop
if xarg(i) = y then
return i;
end if;
end loop;
return -1;
end function find_msb;
-- Performs the boolean operation on every bit in the vector
-- L.15
function "and" (L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
ALIAS rv : UNSIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : UNSIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "and" (l, rv(i));
END LOOP;
RETURN result;
end function "and";
-- L.16
function "and" (L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
ALIAS lv : UNSIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : UNSIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "and" (lv(i), r);
END LOOP;
RETURN result;
end function "and";
-- L.17
function "or" (L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
ALIAS rv : UNSIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : UNSIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "or" (l, rv(i));
END LOOP;
RETURN result;
end function "or";
-- L.18
function "or" (L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
ALIAS lv : UNSIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : UNSIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "or" (lv(i), r);
END LOOP;
RETURN result;
end function "or";
-- L.19
function "nand" (L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
ALIAS rv : UNSIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : UNSIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("and" (l, rv(i)));
END LOOP;
RETURN result;
end function "nand";
-- L.20
function "nand" (L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
ALIAS lv : UNSIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : UNSIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("and" (lv(i), r));
END LOOP;
RETURN result;
end function "nand";
-- L.21
function "nor" (L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
ALIAS rv : UNSIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : UNSIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("or" (l, rv(i)));
END LOOP;
RETURN result;
end function "nor";
-- L.22
function "nor" (L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
ALIAS lv : UNSIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : UNSIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("or" (lv(i), r));
END LOOP;
RETURN result;
end function "nor";
-- L.23
function "xor" (L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
ALIAS rv : UNSIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : UNSIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "xor" (l, rv(i));
END LOOP;
RETURN result;
end function "xor";
-- L.24
function "xor" (L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
ALIAS lv : UNSIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : UNSIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "xor" (lv(i), r);
END LOOP;
RETURN result;
end function "xor";
-- L.25
function "xnor" (L: STD_ULOGIC; R: UNSIGNED) return UNSIGNED is
ALIAS rv : UNSIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : UNSIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("xor" (l, rv(i)));
END LOOP;
RETURN result;
end function "xnor";
-- L.26
function "xnor" (L: UNSIGNED; R: STD_ULOGIC) return UNSIGNED is
ALIAS lv : UNSIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : UNSIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("xor" (lv(i), r));
END LOOP;
RETURN result;
end function "xnor";
-- L.27
function "and" (L: STD_ULOGIC; R: SIGNED) return SIGNED is
ALIAS rv : SIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : SIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "and" (l, rv(i));
END LOOP;
RETURN result;
end function "and";
-- L.28
function "and" (L: SIGNED; R: STD_ULOGIC) return SIGNED is
ALIAS lv : SIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : SIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "and" (lv(i), r);
END LOOP;
RETURN result;
end function "and";
-- L.29
function "or" (L: STD_ULOGIC; R: SIGNED) return SIGNED is
ALIAS rv : SIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : SIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "or" (l, rv(i));
END LOOP;
RETURN result;
end function "or";
-- L.30
function "or" (L: SIGNED; R: STD_ULOGIC) return SIGNED is
ALIAS lv : SIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : SIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "or" (lv(i), r);
END LOOP;
RETURN result;
end function "or";
-- L.31
function "nand" (L: STD_ULOGIC; R: SIGNED) return SIGNED is
ALIAS rv : SIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : SIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("and" (l, rv(i)));
END LOOP;
RETURN result;
end function "nand";
-- L.32
function "nand" (L: SIGNED; R: STD_ULOGIC) return SIGNED is
ALIAS lv : SIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : SIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("and" (lv(i), r));
END LOOP;
RETURN result;
end function "nand";
-- L.33
function "nor" (L: STD_ULOGIC; R: SIGNED) return SIGNED is
ALIAS rv : SIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : SIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("or" (l, rv(i)));
END LOOP;
RETURN result;
end function "nor";
-- L.34
function "nor" (L: SIGNED; R: STD_ULOGIC) return SIGNED is
ALIAS lv : SIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : SIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("or" (lv(i), r));
END LOOP;
RETURN result;
end function "nor";
-- L.35
function "xor" (L: STD_ULOGIC; R: SIGNED) return SIGNED is
ALIAS rv : SIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : SIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "xor" (l, rv(i));
END LOOP;
RETURN result;
end function "xor";
-- L.36
function "xor" (L: SIGNED; R: STD_ULOGIC) return SIGNED is
ALIAS lv : SIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : SIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "xor" (lv(i), r);
END LOOP;
RETURN result;
end function "xor";
-- L.37
function "xnor" (L: STD_ULOGIC; R: SIGNED) return SIGNED is
ALIAS rv : SIGNED ( 1 TO r'LENGTH ) IS r;
VARIABLE result : SIGNED ( 1 TO r'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("xor" (l, rv(i)));
END LOOP;
RETURN result;
end function "xnor";
-- L.38
function "xnor" (L: SIGNED; R: STD_ULOGIC) return SIGNED is
ALIAS lv : SIGNED ( 1 TO l'LENGTH ) IS l;
VARIABLE result : SIGNED ( 1 TO l'LENGTH );
BEGIN
FOR i IN result'RANGE LOOP
result(i) := "not"("xor" (lv(i), r));
END LOOP;
RETURN result;
end function "xnor";
--------------------------------------------------------------------------
-- Reduction operations
--------------------------------------------------------------------------
-- %%% Remove the following 12 funcitons (old syntax)
function and_reduce (arg : SIGNED ) return std_ulogic is
begin
return and_reduce (UNSIGNED ( arg ));
end function and_reduce;
FUNCTION and_reduce ( arg : UNSIGNED ) RETURN std_ulogic IS
variable Upper, Lower : std_ulogic;
variable Half : integer;
variable BUS_int : UNSIGNED ( arg'length - 1 downto 0 );
variable Result : std_ulogic := '1'; -- In the case of a NULL range
BEGIN
if (arg'LENGTH >= 1) then
BUS_int := to_ux01 (arg);
if ( BUS_int'length = 1 ) then
Result := BUS_int ( BUS_int'left );
elsif ( BUS_int'length = 2 ) then
Result := "and" (BUS_int(BUS_int'right),BUS_int(BUS_int'left));
else
Half := ( BUS_int'length + 1 ) / 2 + BUS_int'right;
Upper := and_reduce ( BUS_int ( BUS_int'left downto Half ));
Lower := and_reduce ( BUS_int ( Half - 1 downto BUS_int'right ));
Result := "and" (Upper, Lower);
end if;
end if;
return Result;
END FUNCTION and_reduce;
function nand_reduce (arg : SIGNED ) return std_ulogic is
begin
return "not" (and_reduce ( arg ));
end function nand_reduce;
function nand_reduce (arg : UNSIGNED ) return std_ulogic is
begin
return "not" (and_reduce (arg ));
end function nand_reduce;
function or_reduce (arg : SIGNED ) return std_ulogic is
begin
return or_reduce (UNSIGNED ( arg ));
end function or_reduce;
function or_reduce (arg : UNSIGNED ) return std_ulogic is
variable Upper, Lower : std_ulogic;
variable Half : integer;
variable BUS_int : UNSIGNED ( arg'length - 1 downto 0 );
variable Result : std_ulogic := '0'; -- In the case of a NULL range
BEGIN
if (arg'LENGTH >= 1) then
BUS_int := to_ux01 (arg);
if ( BUS_int'length = 1 ) then
Result := BUS_int ( BUS_int'left );
elsif ( BUS_int'length = 2 ) then
Result := "or" (BUS_int(BUS_int'right), BUS_int(BUS_int'left));
else
Half := ( BUS_int'length + 1 ) / 2 + BUS_int'right;
Upper := or_reduce ( BUS_int ( BUS_int'left downto Half ));
Lower := or_reduce ( BUS_int ( Half - 1 downto BUS_int'right ));
Result := "or" (Upper, Lower);
end if;
end if;
return Result;
end function or_reduce;
function nor_reduce (arg : SIGNED ) return std_ulogic is
begin
RETURN "not"(or_reduce(arg));
end function nor_reduce;
function nor_reduce (arg : UNSIGNED ) return std_ulogic is
begin
RETURN "not"(or_reduce(arg));
end function nor_reduce;
function xor_reduce (arg : SIGNED ) return std_ulogic is
begin
return xor_reduce (UNSIGNED ( arg ));
end function xor_reduce;
function xor_reduce (arg : UNSIGNED ) return std_ulogic is
variable Upper, Lower : std_ulogic;
variable Half : integer;
variable BUS_int : UNSIGNED ( arg'length - 1 downto 0 );
variable Result : std_ulogic := '0'; -- In the case of a NULL range
BEGIN
if (arg'LENGTH >= 1) then
BUS_int := to_ux01 (arg);
if ( BUS_int'length = 1 ) then
Result := BUS_int ( BUS_int'left );
elsif ( BUS_int'length = 2 ) then
Result := "xor" (BUS_int(BUS_int'right), BUS_int(BUS_int'left));
else
Half := ( BUS_int'length + 1 ) / 2 + BUS_int'right;
Upper := xor_reduce ( BUS_int ( BUS_int'left downto Half ));
Lower := xor_reduce ( BUS_int ( Half - 1 downto BUS_int'right ));
Result := "xor" (Upper, Lower);
end if;
end if;
return Result;
end function xor_reduce;
function xnor_reduce (arg : SIGNED ) return std_ulogic is
begin
RETURN "not"(xor_reduce(arg));
end function xnor_reduce;
function xnor_reduce (arg : UNSIGNED ) return std_ulogic is
begin
RETURN "not"(xor_reduce(arg));
end function xnor_reduce;
-- %%% Replace the above with the following 12 functions (New syntax)
-- function "and" ( arg : SIGNED ) return std_ulogic is
-- begin
-- return and (std_logic_vector ( arg ));
-- end function "and";
-- function "and" ( arg : UNSIGNED ) return std_ulogic is
-- begin
-- return and (std_logic_vector ( arg ));
-- end function "and";
-- function "nand" ( arg : SIGNED ) return std_ulogic is
-- begin
-- return nand (std_logic_vector ( arg ));
-- end function "nand";
-- function "nand" ( arg : UNSIGNED ) return std_ulogic is
-- begin
-- return nand (std_logic_vector ( arg ));
-- end function "nand";
-- function "or" ( arg : SIGNED ) return std_ulogic is
-- begin
-- return or (std_logic_vector ( arg ));
-- end function "or";
-- function "or" ( arg : UNSIGNED ) return std_ulogic is
-- begin
-- return or (std_logic_vector ( arg ));
-- end function "or";
-- function "nor" ( arg : SIGNED ) return std_ulogic is
-- begin
-- return nor (std_logic_vector ( arg ));
-- end function "nor";
-- function "nor" ( arg : UNSIGNED ) return std_ulogic is
-- begin
-- return nor (std_logic_vector ( arg ));
-- end function "nor";
-- function "xor" ( arg : SIGNED ) return std_ulogic is
-- begin
-- return xor (std_logic_vector ( arg ));
-- end function "xor";
-- function "xor" ( arg : UNSIGNED ) return std_ulogic is
-- begin
-- return xor (std_logic_vector ( arg ));
-- end function "xor";
-- function "xnor" ( arg : SIGNED ) return std_ulogic is
-- begin
-- return xnor (std_logic_vector ( arg ));
-- end function "xnor";
-- function "xnor" ( arg : UNSIGNED ) return std_ulogic is
-- begin
-- return xnor (std_logic_vector ( arg ));
-- end function "xnor";
-- rtl_synthesis off
-------------------------------------------------------------------
-- TO_STRING
-------------------------------------------------------------------
-- Type and constant definitions used to map STD_ULOGIC values
-- into/from character values.
type MVL9plus is ('U', 'X', '0', '1', 'Z', 'W', 'L', 'H', '-', ERROR);
type char_indexed_by_MVL9 is array (STD_ULOGIC) of character;
type MVL9_indexed_by_char is array (character) of STD_ULOGIC;
type MVL9plus_indexed_by_char is array (character) of MVL9plus;
constant MVL9_to_char : char_indexed_by_MVL9 := "UX01ZWLH-";
constant char_to_MVL9 : MVL9_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => 'U');
constant char_to_MVL9plus : MVL9plus_indexed_by_char :=
('U' => 'U', 'X' => 'X', '0' => '0', '1' => '1', 'Z' => 'Z',
'W' => 'W', 'L' => 'L', 'H' => 'H', '-' => '-', others => ERROR);
constant NBSP : character := character'val(160); -- space character
constant NUS : string(2 to 1) := (others => ' '); -- NULL array
function justify (
value : STRING;
justified : SIDE := right;
field : width := 0)
return STRING is
constant VAL_LEN : INTEGER := value'length;
variable result : STRING (1 to field) := (others => ' ');
begin -- function justify
-- return value if field is too small
if VAL_LEN >= field then
return value;
end if;
if justified = left then
result(1 to VAL_LEN) := value;
elsif justified = right then
result(field - VAL_LEN + 1 to field) := value;
end if;
return result;
end function justify;
function to_string (
value : in signed;
justified : in side := RIGHT;
field : in width := 0
) return string is
alias ivalue : signed(1 to value'length) is value;
variable result : string(1 to value'length);
begin
if value'length < 1 then
return NUS;
else
for i in ivalue'range loop
result(i) := MVL9_to_char( iValue(i) );
end loop;
return justify(result, justified, field);
end if;
end function to_string;
function to_bstring (
value : in SIGNED;
justified : in side := RIGHT;
field : in width := 0
) return STRING is
begin
return to_string (value, justified, field);
end function to_bstring;
function to_hstring (
value : in signed;
justified : in side := RIGHT;
field : in width := 0
) return string is
constant ne : integer := (value'length+3)/4;
variable pad : std_logic_vector(0 to (ne*4 - value'length) - 1);
variable ivalue : std_logic_vector(0 to ne*4 - 1);
variable result : string(1 to ne);
variable quad : std_logic_vector(0 to 3);
begin
if value'length < 1 then
return NUS;
else
if value (value'left) = 'Z' then
pad := (others => 'Z');
else
pad := (others => value(value'high)); -- Extend sign bit
end if;
ivalue := pad & std_logic_vector (value);
for i in 0 to ne-1 loop
quad := To_X01Z(ivalue(4*i to 4*i+3));
case quad is
when x"0" => result(i+1) := '0';
when x"1" => result(i+1) := '1';
when x"2" => result(i+1) := '2';
when x"3" => result(i+1) := '3';
when x"4" => result(i+1) := '4';
when x"5" => result(i+1) := '5';
when x"6" => result(i+1) := '6';
when x"7" => result(i+1) := '7';
when x"8" => result(i+1) := '8';
when x"9" => result(i+1) := '9';
when x"A" => result(i+1) := 'A';
when x"B" => result(i+1) := 'B';
when x"C" => result(i+1) := 'C';
when x"D" => result(i+1) := 'D';
when x"E" => result(i+1) := 'E';
when x"F" => result(i+1) := 'F';
when "ZZZZ" => result(i+1) := 'Z';
when others => result(i+1) := 'X';
end case;
end loop;
return justify(result, justified, field);
end if;
end function to_hstring;
function to_ostring (
value : in signed;
justified : in side := RIGHT;
field : in width := 0
) return string is
constant ne : integer := (value'length+2)/3;
variable pad : std_logic_vector(0 to (ne*3 - value'length) - 1);
variable ivalue : std_logic_vector(0 to ne*3 - 1);
variable result : string(1 to ne);
variable tri : std_logic_vector(0 to 2);
begin
if value'length < 1 then
return NUS;
else
if value (value'left) = 'Z' then
pad := (others => 'Z');
else
pad := (others => value (value'high)); -- Extend sign bit
end if;
ivalue := pad & std_logic_vector (value);
for i in 0 to ne-1 loop
tri := To_X01Z(ivalue(3*i to 3*i+2));
case tri is
when o"0" => result(i+1) := '0';
when o"1" => result(i+1) := '1';
when o"2" => result(i+1) := '2';
when o"3" => result(i+1) := '3';
when o"4" => result(i+1) := '4';
when o"5" => result(i+1) := '5';
when o"6" => result(i+1) := '6';
when o"7" => result(i+1) := '7';
when "ZZZ" => result(i+1) := 'Z';
when others => result(i+1) := 'X';
end case;
end loop;
return justify(result, justified, field);
end if;
end function to_ostring;
function to_string (
value : in UNSIGNED;
justified : in side := RIGHT;
field : in width := 0
) return string is
begin
return to_string(
value => SIGNED (value),
justified => justified,
field => field);
end function to_string;
function to_bstring (
value : in UNSIGNED;
justified : in side := RIGHT;
field : in width := 0
) return STRING is
begin
return to_string (value, justified, field);
end function to_bstring;
function to_hstring (
value : in UNSIGNED;
justified : in side := RIGHT;
field : in width := 0
) return string is
constant ne : integer := (value'length+3)/4;
variable pad : std_logic_vector(0 to (ne*4 - value'length) - 1);
variable ivalue : std_logic_vector(0 to ne*4 - 1);
variable result : string(1 to ne);
variable quad : std_logic_vector(0 to 3);
begin
if value'length < 1 then
return NUS;
else
if value (value'left) = 'Z' then
pad := (others => 'Z');
else
pad := (others => '0');
end if;
ivalue := pad & std_logic_vector (value);
for i in 0 to ne-1 loop
quad := To_X01Z(ivalue(4*i to 4*i+3));
case quad is
when x"0" => result(i+1) := '0';
when x"1" => result(i+1) := '1';
when x"2" => result(i+1) := '2';
when x"3" => result(i+1) := '3';
when x"4" => result(i+1) := '4';
when x"5" => result(i+1) := '5';
when x"6" => result(i+1) := '6';
when x"7" => result(i+1) := '7';
when x"8" => result(i+1) := '8';
when x"9" => result(i+1) := '9';
when x"A" => result(i+1) := 'A';
when x"B" => result(i+1) := 'B';
when x"C" => result(i+1) := 'C';
when x"D" => result(i+1) := 'D';
when x"E" => result(i+1) := 'E';
when x"F" => result(i+1) := 'F';
when "ZZZZ" => result(i+1) := 'Z';
when others => result(i+1) := 'X';
end case;
end loop;
return justify(result, justified, field);
end if;
end function to_hstring;
function to_ostring (
value : in UNSIGNED;
justified : in side := RIGHT;
field : in width := 0
) return string is
constant ne : integer := (value'length+2)/3;
variable pad : std_logic_vector(0 to (ne*3 - value'length) - 1);
variable ivalue : std_logic_vector(0 to ne*3 - 1);
variable result : string(1 to ne);
variable tri : std_logic_vector(0 to 2);
begin
if value'length < 1 then
return NUS;
else
if value (value'left) = 'Z' then
pad := (others => 'Z');
else
pad := (others => '0');
end if;
ivalue := pad & std_logic_vector (value);
for i in 0 to ne-1 loop
tri := To_X01Z(ivalue(3*i to 3*i+2));
case tri is
when o"0" => result(i+1) := '0';
when o"1" => result(i+1) := '1';
when o"2" => result(i+1) := '2';
when o"3" => result(i+1) := '3';
when o"4" => result(i+1) := '4';
when o"5" => result(i+1) := '5';
when o"6" => result(i+1) := '6';
when o"7" => result(i+1) := '7';
when "ZZZ" => result(i+1) := 'Z';
when others => result(i+1) := 'X';
end case;
end loop;
return justify(result, justified, field);
end if;
end function to_ostring;
-----------------------------------------------------------------------------
-- Read and Write routines
-----------------------------------------------------------------------------
procedure WRITE (
L : inout line; -- input line
VALUE : in signed; -- fixed point input
JUSTIFIED : in SIDE := RIGHT;
FIELD : in WIDTH := 0) is
variable s : string(1 to value'length);
variable m : signed(1 to value'length) := value;
begin
for i in 1 to value'length loop
s(i) := MVL9_to_char(m(i));
end loop;
write(l, s, justified, field);
end procedure WRITE;
procedure READ(L : inout LINE;
VALUE : out signed) is
variable m : STD_ULOGIC;
variable c : character;
variable readOk : BOOLEAN;
variable s : string(1 to value'length-1);
variable mv : STD_LOGIC_VECTOR(0 to value'length-1);
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, readOk);
exit when ((readOk = false) or ((c /= ' ') and (c /= CR) and (c /= HT)));
end loop;
if readOk = false then -- Bail out if there was a bad read
report "STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) "
& "Error end of string encountered"
severity error;
return;
elsif char_to_MVL9plus(c) = ERROR then
report
"STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) Error: Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
end if;
read(l, s, readOk);
if readOk then
for i in 1 to value'length-1 loop
if char_to_MVL9plus(s(i)) = ERROR then
report
"STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) Error: Character '" &
s(i) & "' read, expected STD_ULOGIC literal."
severity error;
return;
end if;
end loop;
else
report "STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) "
& "Error end of string encountered"
severity error;
return;
end if;
mv(0) := char_to_MVL9(c);
for i in 1 to value'length-1 loop
mv(i) := char_to_MVL9(s(i));
end loop;
value := signed(mv);
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out signed;
GOOD : out BOOLEAN) is
variable m : STD_ULOGIC;
variable c : character;
variable s : string(1 to value'length-1);
variable mv : STD_LOGIC_VECTOR(0 to value'length-1);
variable readOk : BOOLEAN;
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, readOk);
exit when (readOk = FALSE) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not readOk then
good := FALSE;
return;
end if;
if char_to_MVL9plus(c) = ERROR then
good := FALSE;
return;
end if;
read(l, s, readOk);
-- Bail out if there was a bad read
if not readOk then
good := FALSE;
return;
end if;
for i in 1 to value'length-1 loop
if char_to_MVL9plus(s(i)) = ERROR then
good := FALSE;
return;
end if;
end loop;
mv(0) := char_to_MVL9(c);
for i in 1 to value'length-1 loop
mv(i) := char_to_MVL9(s(i));
end loop;
value := signed(mv);
good := TRUE;
end procedure READ;
procedure WRITE (
L : inout line; -- input line
VALUE : in UNSIGNED; -- fixed point input
JUSTIFIED : in SIDE := RIGHT;
FIELD : in WIDTH := 0) is
variable s : string(1 to value'length);
variable m : UNSIGNED(1 to value'length) := value;
begin
for i in 1 to value'length loop
s(i) := MVL9_to_char(m(i));
end loop;
write(l, s, justified, field);
end procedure WRITE;
procedure READ(L : inout LINE;
VALUE : out UNSIGNED) is
variable m : STD_LOGIC;
variable c : character;
variable readOk : BOOLEAN;
variable s : string(1 to value'length-1);
variable mv : STD_LOGIC_VECTOR(0 to value'length-1);
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, readOk);
exit when ((readOk = false) or ((c /= ' ') and (c /= CR) and (c /= HT)));
end loop;
if readOk = false then -- Bail out if there was a bad read
report "STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) "
& "Error end of string encountered"
severity error;
return;
elsif char_to_MVL9plus(c) = ERROR then
report
"STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) Error: Character '" &
c & "' read, expected STD_ULOGIC literal."
severity error;
return;
end if;
read(l, s, readOk);
if readOk then
for i in 1 to value'length-1 loop
if char_to_MVL9plus(s(i)) = ERROR then
report
"STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) Error: Character '" &
s(i) & "' read, expected STD_ULOGIC literal."
severity error;
return;
end if;
end loop;
else
report "STD_LOGIC_1164.READ(STD_ULOGIC_VECTOR) "
& "Error end of string encountered"
severity error;
return;
end if;
mv(0) := char_to_MVL9(c);
for i in 1 to value'length-1 loop
mv(i) := char_to_MVL9(s(i));
end loop;
value := UNSIGNED(mv);
end procedure READ;
procedure READ(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN) is
variable m : STD_LOGIC;
variable c : character;
variable s : string(1 to value'length-1);
variable mv : STD_LOGIC_VECTOR(0 to value'length-1);
variable readOk : BOOLEAN;
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, readOk);
exit when (readOk = FALSE) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not readOk then
good := FALSE;
return;
end if;
if char_to_MVL9plus(c) = ERROR then
good := FALSE;
return;
end if;
read(l, s, readOk);
-- Bail out if there was a bad read
if not readOk then
good := FALSE;
return;
end if;
for i in 1 to value'length-1 loop
if char_to_MVL9plus(s(i)) = ERROR then
good := FALSE;
return;
end if;
end loop;
mv(0) := char_to_MVL9(c);
for i in 1 to value'length-1 loop
mv(i) := char_to_MVL9(s(i));
end loop;
value := UNSIGNED(mv);
good := TRUE;
end procedure READ;
procedure BWRITE (
L : inout LINE; -- input line
VALUE : in SIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
WRITE (L, VALUE, JUSTIFIED, FIELD);
end procedure BWRITE;
procedure BREAD(L : inout LINE;
VALUE : out SIGNED) is
begin
READ (L, VALUE);
end procedure BREAD;
procedure BREAD(L : inout LINE;
VALUE : out SIGNED;
GOOD : out BOOLEAN) is
begin
READ (L, VALUE, GOOD);
end procedure BREAD;
procedure BWRITE (
L : inout LINE; -- input line
VALUE : in UNSIGNED; -- fixed point input
JUSTIFIED : in SIDE := right;
FIELD : in WIDTH := 0) is
begin
WRITE (L, VALUE, JUSTIFIED, FIELD);
end procedure BWRITE;
procedure BREAD(L : inout LINE;
VALUE : out UNSIGNED) is
begin
READ (L, VALUE);
end procedure BREAD;
procedure BREAD(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN) is
begin
READ (L, VALUE, GOOD);
end procedure BREAD;
-- Hex Read and Write procedures for STD_ULOGIC_VECTOR.
-- Modified from the original to be more forgiving.
procedure Char2QuadBits (C : Character;
RESULT : out std_ulogic_vector(3 downto 0);
GOOD : out Boolean;
ISSUE_ERROR : in Boolean) is
begin
case c is
when '0' => result := x"0"; good := TRUE;
when '1' => result := x"1"; good := TRUE;
when '2' => result := x"2"; good := TRUE;
when '3' => result := x"3"; good := TRUE;
when '4' => result := x"4"; good := TRUE;
when '5' => result := x"5"; good := TRUE;
when '6' => result := x"6"; good := TRUE;
when '7' => result := x"7"; good := TRUE;
when '8' => result := x"8"; good := TRUE;
when '9' => result := x"9"; good := TRUE;
when 'A' | 'a' => result := x"A"; good := TRUE;
when 'B' | 'b' => result := x"B"; good := TRUE;
when 'C' | 'c' => result := x"C"; good := TRUE;
when 'D' | 'd' => result := x"D"; good := TRUE;
when 'E' | 'e' => result := x"E"; good := TRUE;
when 'F' | 'f' => result := x"F"; good := TRUE;
when 'Z' => result := "ZZZZ"; good := TRUE;
when 'X' => result := "XXXX"; good := TRUE;
when others =>
assert not ISSUE_ERROR
report
"STD_LOGIC_1164.OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
good := FALSE;
end case;
end procedure Char2QuadBits;
procedure HWRITE (
L : inout line; -- input line
VALUE : in signed;
JUSTIFIED : in SIDE := RIGHT;
FIELD : in WIDTH := 0) is
begin
WRITE ( L => L,
VALUE => to_hstring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure HWRITE;
procedure HREAD(L : inout LINE;
VALUE : out signed) is
constant ne : INTEGER := (value'length+3)/4;
constant pad : INTEGER := ne*4 - value'length;
variable ivalue : unsigned(0 to ne*4-1);
begin
HREAD ( L => L,
VALUE => ivalue); -- Read padded string
if (pad > 0) then
if (to_X01(ivalue(0)) = '0') then -- positive
if to_X01(ivalue(0)) = or_reduce(ivalue(0 to pad)) then
VALUE := SIGNED (ivalue (pad to ivalue'high));
else
assert false
report "NUMERIC_STD.HREAD Error: Signed vector truncated"
severity error;
end if;
else -- negative
if to_X01(ivalue(0)) = and_reduce(ivalue(0 to pad)) then
VALUE := SIGNED (ivalue (pad to ivalue'high));
else
assert false
report "NUMERIC_STD.HREAD Error: Signed vector truncated"
severity error;
end if;
end if;
else
VALUE := signed (ivalue);
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out signed;
GOOD : out BOOLEAN) is
constant ne : INTEGER := (value'length+3)/4;
constant pad : INTEGER := ne*4 - value'length;
variable ivalue : UNSIGNED(0 to ne*4-1);
variable ok : BOOLEAN;
begin
HREAD ( L => L,
VALUE => ivalue, -- Read padded STRING
good => ok);
if not ok then
good := FALSE;
return;
end if;
if (pad > 0) then
if (to_X01(ivalue(0)) = '0') then -- positive
if to_X01(ivalue(0)) = or_reduce(ivalue(0 to pad)) then
GOOD := true;
VALUE := SIGNED (ivalue (pad to ivalue'high));
else
GOOD := false;
end if;
else -- negative
if to_X01(ivalue(0)) = and_reduce(ivalue(0 to pad)) then
GOOD := true;
VALUE := SIGNED (ivalue (pad to ivalue'high));
else
GOOD := false;
end if;
end if;
else
GOOD := true;
VALUE := signed (ivalue);
end if;
end procedure HREAD;
procedure HWRITE (
L : inout line; -- input line
VALUE : in UNSIGNED;
JUSTIFIED : in SIDE := RIGHT;
FIELD : in WIDTH := 0) is
begin
WRITE ( L => L,
VALUE => to_hstring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure HWRITE;
procedure HREAD(L : inout LINE;
VALUE : out UNSIGNED) is
variable ok : boolean;
variable c : character;
constant ne : INTEGER := (value'length+3)/4;
constant pad : INTEGER := ne*4 - value'length;
variable sv : std_ulogic_vector(0 to ne*4 - 1);
variable s : string(1 to ne-1);
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, ok);
exit when (ok = FALSE) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
report "STD_LOGIC_1164.HREAD Error: Failed skipping white space"
severity error;
return;
end if;
Char2QuadBits(c, sv(0 to 3), ok, TRUE);
if not ok then
return;
end if;
read(L, s, ok);
if not ok then
report "STD_LOGIC_1164.HREAD Error: Failed to read the STRING"
severity error;
return;
end if;
for i in 1 to ne-1 loop
Char2QuadBits(s(i), sv(4*i to 4*i+3), ok, TRUE);
if not ok then
return;
end if;
end loop;
value := UNSIGNED(to_StdLogicVector(sv (pad to sv'high)));
if or_reduce (UNSIGNED(sv (0 to pad-1))) = '1' then -- %%% replace with "or"
report "STD_LOGIC_1164.HREAD Error: Vector truncated"
severity error;
end if;
end procedure HREAD;
procedure HREAD(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN) is
variable ok : boolean;
variable c : character;
constant ne : INTEGER := (value'length+3)/4;
constant pad : INTEGER := ne*4 - value'length;
variable sv : std_ulogic_vector(0 to ne*4 - 1);
variable s : string(1 to ne-1);
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, ok);
exit when (ok = FALSE) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
good := FALSE;
return;
end if;
Char2QuadBits(c, sv(0 to 3), ok, FALSE);
if not ok then
good := FALSE;
return;
end if;
read(L, s, ok);
if not ok then
good := FALSE;
return;
end if;
for i in 1 to ne-1 loop
Char2QuadBits(s(i), sv(4*i to 4*i+3), ok, FALSE);
if not ok then
good := FALSE;
return;
end if;
end loop;
if or_reduce (unsigned(sv (0 to pad-1))) = '1' then -- %%% replace with "or"
good := false; -- vector was truncated.
else
value := unsigned(to_stdlogicvector(sv (pad to sv'high)));
good := true;
end if;
end procedure HREAD;
-- Octal Read and Write procedures for STD_ULOGIC_VECTOR.
-- Modified from the original to be more forgiving.
procedure Char2TriBits (C : Character;
RESULT : out std_ulogic_vector(2 downto 0);
GOOD : out Boolean;
ISSUE_ERROR : in Boolean) is
begin
case c is
when '0' => result := o"0"; good := TRUE;
when '1' => result := o"1"; good := TRUE;
when '2' => result := o"2"; good := TRUE;
when '3' => result := o"3"; good := TRUE;
when '4' => result := o"4"; good := TRUE;
when '5' => result := o"5"; good := TRUE;
when '6' => result := o"6"; good := TRUE;
when '7' => result := o"7"; good := TRUE;
when 'Z' => result := "ZZZ"; good := TRUE;
when 'X' => result := "XXX"; good := TRUE;
when others =>
assert not ISSUE_ERROR
report
"STD_LOGIC_1164.OREAD Error: Read a '" & c &
"', expected an Octal character (0-7)."
severity error;
good := FALSE;
end case;
end procedure Char2TriBits;
procedure OWRITE (
L : inout line; -- input line
VALUE : in signed;
JUSTIFIED : in SIDE := RIGHT;
FIELD : in WIDTH := 0) is
begin
WRITE ( L => L,
VALUE => to_ostring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure OWRITE;
procedure OREAD(L : inout LINE;
VALUE : out signed) is
constant ne : INTEGER := (value'length+2)/3;
constant pad : INTEGER := ne*3 - value'length;
variable ivalue : UNSIGNED (0 to ne*3-1);
begin
OREAD ( L => L,
VALUE => ivalue); -- Read padded string
if (pad > 0) then
if (to_X01(ivalue(0)) = '0') then -- positive
if to_X01(ivalue(0)) = or_reduce(ivalue(0 to pad)) then
VALUE := SIGNED (ivalue (pad to ivalue'high));
else
report "NUMERIC_STD.OREAD Error: Signed vector truncated"
severity error;
end if;
else -- negative
if to_X01(ivalue(0)) = and_reduce(ivalue(0 to pad)) then
VALUE := SIGNED (ivalue (pad to ivalue'high));
else
report "NUMERIC_STD.OREAD Error: Signed vector truncated"
severity error;
end if;
end if;
else
VALUE := signed (ivalue);
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out signed;
GOOD : out BOOLEAN) is
constant ne : INTEGER := (value'length+2)/3;
constant pad : INTEGER := ne*3 - value'length;
variable ivalue : UNSIGNED (0 to ne*3-1);
variable ok : BOOLEAN;
begin
OREAD ( L => L,
VALUE => ivalue, -- Read padded STRING
good => ok);
-- Bail out if there was a bad read
if not ok then
good := FALSE;
return;
end if;
if (pad > 0) then
if (to_X01(ivalue(0)) = '0') then -- positive
if to_X01(ivalue(0)) = or_reduce(ivalue(0 to pad)) then
VALUE := SIGNED (ivalue (pad to ivalue'high));
good := true;
else
good := false;
end if;
else -- negative
if to_X01(ivalue(0)) = and_reduce(ivalue(0 to pad)) then
VALUE := SIGNED (ivalue (pad to ivalue'high));
good := true;
else
good := false;
end if;
end if;
else
good := true;
VALUE := signed (ivalue);
end if;
end procedure OREAD;
procedure OWRITE (
L : inout line; -- input line
VALUE : in UNSIGNED;
JUSTIFIED : in SIDE := RIGHT;
FIELD : in WIDTH := 0) is
begin
WRITE ( L => L,
VALUE => to_ostring(VALUE),
JUSTIFIED => JUSTIFIED,
FIELD => FIELD);
end procedure OWRITE;
procedure OREAD(L : inout LINE;
VALUE : out UNSIGNED) is
variable c : character;
variable ok : boolean;
constant ne : INTEGER := (value'length+2)/3;
constant pad : INTEGER := ne*3 - value'length;
variable sv : std_ulogic_vector(0 to ne*3 - 1);
variable s : string(1 to ne-1);
begin
VALUE (VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, ok);
exit when (ok = FALSE) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
report "STD_LOGIC_1164.OREAD Error: Failed skipping white space"
severity error;
return;
end if;
Char2TriBits(c, sv(0 to 2), ok, TRUE);
if not ok then
return;
end if;
read(L, s, ok);
if not ok then
report "STD_LOGIC_1164.OREAD Error: Failed to read the STRING"
severity error;
return;
end if;
for i in 1 to ne-1 loop
Char2TriBits(s(i), sv(3*i to 3*i+2), ok, TRUE);
if not ok then
return;
end if;
end loop;
value := unsigned (to_stdlogicvector (sv (pad to sv'high)));
if or_reduce (unsigned(sv (0 to pad-1))) = '1' then -- %%% replace with "or"
report "STD_LOGIC_1164.OREAD Error: Vector truncated"
severity error;
end if;
end procedure OREAD;
procedure OREAD(L : inout LINE;
VALUE : out UNSIGNED;
GOOD : out BOOLEAN) is
variable ok : boolean;
variable c : character;
constant ne : INTEGER := (value'length+2)/3;
constant pad : INTEGER := ne*3 - value'length;
variable sv : std_ulogic_vector(0 to ne*3 - 1);
variable s : string(1 to ne-1);
begin
VALUE(VALUE'range) := (others => 'U');
loop -- skip white space
read(l, c, ok);
exit when (ok = FALSE) or ((c /= ' ') and (c /= NBSP) and (c /= HT));
end loop;
-- Bail out if there was a bad read
if not ok then
good := FALSE;
return;
end if;
Char2TriBits(c, sv(0 to 2), ok, FALSE);
if not ok then
good := FALSE;
return;
end if;
read(L, s, ok);
if not ok then
good := FALSE;
return;
end if;
for i in 1 to ne-1 loop
Char2TriBits(s(i), sv(3*i to 3*i+2), ok, FALSE);
if not ok then
good := FALSE;
return;
end if;
end loop;
value := unsigned (to_stdlogicvector (sv (pad to sv'high)));
if or_reduce (unsigned(sv (0 to pad-1))) = '1' then -- %%% replace with "or"
good := false; -- vector was truncated.
else
good := true;
end if;
end procedure OREAD;
-- rtl_synthesis on
end package body numeric_std_additions;
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