--
-- SKINNY-Hash Reference Hardware Implementation
-- 
-- Copyright 2019:
--     Amir Moradi & Pascal Sasdrich for the SKINNY Team
--     https://sites.google.com/site/skinnycipher/
-- 
-- This program is free software; you can redistribute it and/or
-- modify it under the terms of the GNU General Public License as
-- published by the Free Software Foundation; either version 2 of the
-- License, or (at your option) any later version.
-- 
-- This program 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
-- General Public License for more details.
-- 


-- IMPORTS
----------------------------------------------------------------------------------
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;



-- ENTITY
----------------------------------------------------------------------------------
ENTITY ScanFF IS
	GENERIC (SIZE : INTEGER);
	PORT ( CLK	: IN 	STD_LOGIC;
          SE 	: IN 	STD_LOGIC;
          D  	: IN 	STD_LOGIC_VECTOR((SIZE - 1) DOWNTO 0);
          DS	: IN 	STD_LOGIC_VECTOR((SIZE - 1) DOWNTO 0);
          Q 	: OUT STD_LOGIC_VECTOR((SIZE - 1) DOWNTO 0));
END ScanFF;



-- ARCHITECTURE : STRUCTURAL
----------------------------------------------------------------------------------
ARCHITECTURE Structural OF ScanFF IS

	-- COMPONENTS -----------------------------------------------------------------
	COMPONENT dflipfloplw IS
	PORT ( CLK  : IN  STD_LOGIC;
			 SEL	: IN  STD_LOGIC;
			 D0   : IN  STD_LOGIC;
			 D1   : IN  STD_LOGIC;
			 Q    : OUT STD_LOGIC);
	END COMPONENT;
	-------------------------------------------------------------------------------

BEGIN

	GEN : FOR I IN 0 TO (SIZE - 1) GENERATE
		SFF : dflipfloplw PORT MAP (CLK, SE, D(I), DS(I), Q(I));
	END GENERATE;

END Structural;