106 lines
3.2 KiB
VHDL
106 lines
3.2 KiB
VHDL
--------------------------------------------------------------------------------
|
|
-- Copyright 2012 HES-SO Valais Wallis (www.hevs.ch)
|
|
--------------------------------------------------------------------------------
|
|
-- This program is free software: you can redistribute it and/or modify
|
|
-- it under the terms of the GNU General Public License as published by
|
|
-- the Free Software Foundation; either version 3 of the License, or
|
|
-- (at your option) any later version.
|
|
--
|
|
-- This program IS distributed in the hope that it will be useful,
|
|
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
-- GNU General Public License for more details.
|
|
-- You should have received a copy of the GNU General Public License along with
|
|
-- this program. If not, see <http://www.gnu.org/licenses/>
|
|
-- -----------------------------------------------------------------------------
|
|
-- Often used functions
|
|
--
|
|
-- -----------------------------------------------------------------------------
|
|
-- Authors:
|
|
-- cof: [François Corthay](francois.corthay@hevs.ch)
|
|
-- guo: [Oliver A. Gubler](oliver.gubler@hevs.ch)
|
|
-- -----------------------------------------------------------------------------
|
|
-- Changelog:
|
|
-- 2016-06 : guo
|
|
-- added function sel
|
|
-- 2015-06 : guo
|
|
-- added counterBitNb
|
|
-- -----------------------------------------------------------------------------
|
|
PACKAGE BODY CommonLib IS
|
|
|
|
function requiredBitNb (val : integer) return integer is
|
|
variable powerOfTwo, bitNb : integer;
|
|
begin
|
|
powerOfTwo := 1;
|
|
bitNb := 0;
|
|
while powerOfTwo <= val loop
|
|
powerOfTwo := 2 * powerOfTwo;
|
|
bitNb := bitNb + 1;
|
|
end loop;
|
|
return bitNb;
|
|
end requiredBitNb;
|
|
|
|
function counterBitNb (val : integer) return integer is
|
|
variable powerOfTwo, bitNb : integer;
|
|
begin
|
|
powerOfTwo := 1;
|
|
bitNb := 0;
|
|
while powerOfTwo < val loop
|
|
powerOfTwo := 2 * powerOfTwo;
|
|
bitNb := bitNb + 1;
|
|
end loop;
|
|
return bitNb;
|
|
end counterBitNb;
|
|
|
|
function sel(Cond : BOOLEAN; If_True, If_False : integer)
|
|
return integer is
|
|
begin
|
|
if (Cond = TRUE) then
|
|
return (If_True);
|
|
else
|
|
return (If_False);
|
|
end if;
|
|
end function sel;
|
|
|
|
function sel(Cond : BOOLEAN; If_True, If_False : string)
|
|
return string is
|
|
begin
|
|
if (Cond = TRUE) then
|
|
return (If_True);
|
|
else
|
|
return (If_False);
|
|
end if;
|
|
end function sel;
|
|
|
|
function sel(Cond : BOOLEAN; If_True, If_False : std_ulogic_vector)
|
|
return std_ulogic_vector is
|
|
begin
|
|
if (Cond = TRUE) then
|
|
return (If_True);
|
|
else
|
|
return (If_False);
|
|
end if;
|
|
end function sel;
|
|
|
|
function sel(Cond : BOOLEAN; If_True, If_False : unsigned)
|
|
return unsigned is
|
|
begin
|
|
if (Cond = TRUE) then
|
|
return (If_True);
|
|
else
|
|
return (If_False);
|
|
end if;
|
|
end function sel;
|
|
|
|
function sel(Cond : BOOLEAN; If_True, If_False : signed)
|
|
return signed is
|
|
begin
|
|
if (Cond = TRUE) then
|
|
return (If_True);
|
|
else
|
|
return (If_False);
|
|
end if;
|
|
end function sel;
|
|
|
|
END CommonLib;
|