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daniel.kho |
/* Tauhop resolution package
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Description
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Defines common resolution functions.
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To Do:
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Author(s):
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- Daniel C.K. Kho, daniel.kho@tauhop.com
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Copyright (C) 2012-2014 Authors and Tauhop Solutions.
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This source file may be used and distributed without
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restriction provided that this copyright statement is not
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removed from the file and that any derivative work contains
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the original copyright notice and the associated disclaimer.
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This source file is free software; you can redistribute it
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and/or modify it under the terms of the GNU Lesser General
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Public License as published by the Free Software Foundation;
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either version 2.1 of the License, or (at your option) any
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later version.
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This source is distributed in the hope that it will be
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useful, but WITHOUT ANY WARRANTY; without even the implied
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warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the GNU Lesser General Public License for more
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details.
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You should have received a copy of the GNU Lesser General
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Public License along with this source; if not, download it
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from http://www.opencores.org/lgpl.shtml.
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*/
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library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all;
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package resolved is
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generic(type t);
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/* unresolved vector of generic type. */
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type t_vector is array(natural range <>) of t;
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type unsigned32_vector is array (natural range <>) of unsigned(31 downto 0);
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type signed32_vector is array (natural range <>) of signed(31 downto 0);
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type integer_vector is array(natural range <>) of integer;
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function resolve(s:t_vector) return t;
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function resolve(s:unsigned32_vector) return unsigned;
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function resolve(s:integer_vector) return integer;
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function to_int(u_unsigned: unresolved_unsigned) return integer;
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end package resolved;
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package body resolved is
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function resolve(s: t_vector) return t is
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variable result: t;
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begin
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for i in s'range loop
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for j in s(i)'range loop
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if is_LH01(s(i)(j)) then
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if is_LH01(result(j)) then
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report "Multiple driving signals detected." severity warning;
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end if;
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result(j) := s(i)(j);
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end if;
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end loop;
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end loop;
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end function resolve;
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function resolve(s: unsigned32_vector) return unsigned is
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variable result: unsigned(31 downto 0);
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begin
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for i in s'range loop
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if s(i) /= 0 then
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if result /= 0 then
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report "Multiple driving signals on unsigned32" severity warning;
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end if;
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result := s(i);
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end if;
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end loop;
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return result;
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end function resolve;
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function resolve(s:integer_vector) return integer is
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variable result:integer:=0;
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begin
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for i in s'range loop
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if s(i) /= 0 then
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if result /= 0 then
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report "Multiple driving signals on integer" severity warning;
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end if;
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result := s(i);
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end if;
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end loop;
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return result;
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end function resolve;
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function to_int(u_unsigned: unresolved_unsigned) return integer is
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variable result: natural:=0;
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begin
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for i in u_unsigned'range loop
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result := result+result;
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if u_unsigned(i) = '1' then
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result := result + 1;
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end if;
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end loop;
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return result;
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end function to_int;
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end package body resolved;
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