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