www.pudn.com > powerlink.rar > memMap.vhd, change:2013-11-09,size:3161b


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-- memory mapping package for pdi
--
-- 	  Copyright (C) 2010 B&R
--
--    Redistribution and use in source and binary forms, with or without
--    modification, are permitted provided that the following conditions
--    are met:
--
--    1. Redistributions of source code must retain the above copyright
--       notice, this list of conditions and the following disclaimer.
--
--    2. Redistributions in binary form must reproduce the above copyright
--       notice, this list of conditions and the following disclaimer in the
--       documentation and/or other materials provided with the distribution.
--
--    3. Neither the name of B&R nor the names of its
--       contributors may be used to endorse or promote products derived
--       from this software without prior written permission. For written
--       permission, please contact office@br-automation.com
--
--    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
--    "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
--    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
--    FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
--    COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
--    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
--    BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
--    LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
--    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
--    LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
--    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
--    POSSIBILITY OF SUCH DAMAGE.
--
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-- Version History
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-- 2011-09-14	zelenkaj	extracted from pdi.vhd
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-- package for memory mapping
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LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_arith.all;
USE ieee.std_logic_unsigned.all;

package memMap is
	type memoryMapping_t is
	record
		base 							: integer;
		span 							: integer;
	end record;
	
	function align32 (inVal : integer) return integer;
end package memMap;

package body memMap is
	function align32 (inVal : integer) return integer is
	variable tmp : std_logic_vector(31 downto 0);
	variable result : integer;
	begin
		tmp := (conv_std_logic_vector(inVal, tmp'length) + x"00000003") and not x"00000003";
		result := conv_integer(tmp);
		return result;
	end function;
end package body memMap;