Subversion Repositories btc_dsha256

------------------------------------------------------------------- 
--                                                               --
--  Copyright (C) 2013 Author and VariStream Studio              --
--  Author : Yu Peng                                             --
--                                                               -- 
--  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                     -- 
--                                                               -- 
-------------------------------------------------------------------
--  Notes : Introduce delay of 1 clock cycle
-------------------------------------------------------------------
 
library IEEE;
 
use IEEE.STD_LOGIC_1164.ALL;
use ieee.std_logic_unsigned.all;
use work.sha_256_pkg.ALL;
 
entity sha_256_comp_func_1c is
	port(
		iClk : in std_logic;
		iRst_async : in std_logic;
 
		ivA : in std_logic_vector(31 downto 0);
		ivB : in std_logic_vector(31 downto 0);
		ivC : in std_logic_vector(31 downto 0);
		ivD : in std_logic_vector(31 downto 0);
		ivE : in std_logic_vector(31 downto 0);
		ivF : in std_logic_vector(31 downto 0);
		ivG : in std_logic_vector(31 downto 0);
		ivH : in std_logic_vector(31 downto 0);
 
		ivK : in std_logic_vector(31 downto 0);
		ivW : in std_logic_vector(31 downto 0);
 
		ovA : out std_logic_vector(31 downto 0);
		ovB : out std_logic_vector(31 downto 0);
		ovC : out std_logic_vector(31 downto 0);
		ovD : out std_logic_vector(31 downto 0);
		ovE : out std_logic_vector(31 downto 0);
		ovF : out std_logic_vector(31 downto 0);
		ovG : out std_logic_vector(31 downto 0);
		ovH : out std_logic_vector(31 downto 0)
	);
end sha_256_comp_func_1c;
 
architecture behavioral of sha_256_comp_func_1c is
 
	component pipelines_without_reset IS
		GENERIC (gBUS_WIDTH : integer := 3; gNB_PIPELINES: integer range 1 to 255 := 2);
		PORT(
			iClk				: IN		STD_LOGIC;
			iInput				: IN		STD_LOGIC;
			ivInput				: IN		STD_LOGIC_VECTOR(gBUS_WIDTH-1 downto 0);
			oDelayed_output		: OUT		STD_LOGIC;
			ovDelayed_output	: OUT		STD_LOGIC_VECTOR(gBUS_WIDTH-1 downto 0)
		);
	end component;
 
	signal svAOut : std_logic_vector(31 downto 0); 
	signal svEOut : std_logic_vector(31 downto 0);
 
begin
	process(iClk)
	begin
		if rising_edge(iClk) then
			svAOut <= ivH + sum_1(ivE) + chi(ivE, ivF, ivG) + ivK + ivW + sum_0(ivA) + maj(ivA, ivB, ivC);
			svEOut <= ivH + sum_1(ivE) + chi(ivE, ivF, ivG) + ivK + ivW + ivD;
		end if;
	end process;
 
	ovA <= svAOut;
	ovE <= svEOut;
 
	process(iClk)
	begin
		if rising_edge(iClk) then	
			ovB <= ivA;
			ovC <= ivB;
			ovD <= ivC;
			ovF <= ivE;
			ovG <= ivF;
			ovH <= ivG;
		end if;
	end process;
 
end behavioral;