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[/] [potato/] [trunk/] [src/] [pp_utilities.vhd] - Rev 18
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-- The Potato Processor - A simple processor for FPGAs -- (c) Kristian Klomsten Skordal 2014 <kristian.skordal@wafflemail.net> -- Report bugs and issues on <http://opencores.org/project,potato,bugtracker> library ieee; use ieee.std_logic_1164.all; use work.pp_types.all; use work.pp_constants.all; package pp_utilities is --! Converts a boolean to an std_logic. function to_std_logic(input : in boolean) return std_logic; -- Checks if a number is 2^n: function is_pow2(input : in natural) return boolean; --! Calculates log2 with integers. function log2(input : in natural) return natural; end package pp_utilities; package body pp_utilities is function to_std_logic(input : in boolean) return std_logic is begin if input then return '1'; else return '0'; end if; end function to_std_logic; function is_pow2(input : in natural) return boolean is variable c : natural := 1; begin for i in 0 to 31 loop if input = i then return true; end if; c := c * 2; end loop; return false; end function is_pow2; function log2(input : in natural) return natural is variable retval : natural := 0; variable temp : natural := input; begin while temp > 1 loop retval := retval + 1; temp := temp / 2; end loop; return retval; end function log2; end package body pp_utilities;
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