Subversion Repositories gpib_controller

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--This file is part of fpga_gpib_controller.
--
-- Fpga_gpib_controller 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 3 of the License, or
-- (at your option) any later version.
--
-- Fpga_gpib_controller 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.
 
-- You should have received a copy of the GNU General Public License
-- along with Fpga_gpib_controller.  If not, see <http://www.gnu.org/licenses/>.
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-- Entity: SecAddrSaver
-- Date:2011-11-11  
-- Author: Andrzej Paluch
--
-- Description ${cursor}
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library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
 
 
entity SecAddrSaver is
	port (
		reset : in std_logic;
		------------------- gpib ----------------------
		TADS : in std_logic;
		TPAS : in std_logic;
		LADS : in std_logic;
		LPAS : in std_logic;
		MSA_Dec : in std_logic;
		DI : in std_logic_vector(4 downto 0);
		currentSecAddr : out std_logic_vector(4 downto 0)
	);
end SecAddrSaver;
 
architecture arch of SecAddrSaver is
 
	signal goToSecAddressed : std_logic;
 
begin
 
	goToSecAddressed <= MSA_Dec and ((TADS and TPAS) or (LADS and LPAS));
 
	-- save secondary address
	process (reset, goToSecAddressed) begin
		if(reset = '1') then
			currentSecAddr <= (others => '0');
		elsif rising_edge(goToSecAddressed) then
			currentSecAddr <= DI(4 downto 0);
		end if;
	end process;
 
end arch;