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[/] [mod_sim_exp/] [tags/] [Release_1.4/] [rtl/] [vhdl/] [core/] [std_functions.vhd] - Rev 101
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---------------------------------------------------------------------- ---- std_functions ---- ---- ---- ---- This file is part of the ---- ---- Modular Simultaneous Exponentiation Core project ---- ---- http://www.opencores.org/cores/mod_sim_exp/ ---- ---- ---- ---- Description ---- ---- package with standard functions used in this project ---- ---- ---- ---- Authors: ---- ---- - Geoffrey Ottoy, DraMCo research group ---- ---- - Jonas De Craene, JonasDC@opencores.org ---- ---- ---- ---------------------------------------------------------------------- ---- ---- ---- Copyright (C) 2011 DraMCo research group and OPENCORES.ORG ---- ---- ---- ---- This source file may be used and distributed without ---- ---- restriction provided that this copyright statement is not ---- ---- removed from the file and that any derivative work contains ---- ---- the original copyright notice and the associated disclaimer. ---- ---- ---- ---- This source file is free software; you can redistribute it ---- ---- and/or modify it under the terms of the GNU Lesser General ---- ---- Public License as published by the Free Software Foundation; ---- ---- either version 2.1 of the License, or (at your option) any ---- ---- later version. ---- ---- ---- ---- This source 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 Lesser General Public License for more ---- ---- details. ---- ---- ---- ---- You should have received a copy of the GNU Lesser General ---- ---- Public License along with this source; if not, download it ---- ---- from http://www.opencores.org/lgpl.shtml ---- ---- ---- ---------------------------------------------------------------------- library ieee; use ieee.std_logic_1164.all; use ieee.std_logic_unsigned.all; package std_functions is function maxV(L, R: INTEGER) return INTEGER; function minV(L, R: INTEGER) return INTEGER; function log2 (val: INTEGER) return natural; end std_functions; package body std_functions is function maxV(L, R: INTEGER) return INTEGER is begin if L > R then return L; else return R; end if; end; function minV(L, R: INTEGER) return INTEGER is begin if L < R then return L; else return R; end if; end; function log2 (val: INTEGER) return natural is variable res : natural; begin for i in 0 to 31 loop if (val <= (2**i)) then res := i; exit; end if; end loop; return res; end function Log2; end std_functions;
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