Subversion Repositories xmatchpro

--This library 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 library 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 library; if not, write to the Free Software

--Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

-- e_mail : j.l.nunez-yanez@byacom.co.uk

---------------------------------

--  ENTITY       = LATCH7      --

--  version      = 1.0         --

--  last update  = 25/06/99    --

--  author       = Jose Nunez  --

---------------------------------

-- FUNCTION

-- 7 bit latch

-- PIN LIST

-- D_IN  = input data bus

-- CLK   = master clock

-- CLEAR = asynchronous reset of latch

-- D_OUT = output data bus

library ieee,dzx;

use ieee.std_logic_1164.all;

use dzx.attributes.all;

entity LATCH7 is

port

(

        D_IN : in bit_vector(6 downto 0);

        ENABLE : in bit;

        CLEAR : in bit;

        RESET : in bit;

        CLK : in bit;

        D_OUT : out bit_vector(6 downto 0)

);

end LATCH7;

architecture FLIP_FLOP of LATCH7 is

begin

FLOP : process (CLK,CLEAR)

begin

if (CLEAR = '0') then

    D_OUT <= "0000000";

elsif ((CLK'event) and (CLK = '1')) then

        if (RESET = '0') then

                 D_OUT <= "0000000";

        elsif(ENABLE = '1') then

                D_OUT<= "0000000";

        else

                D_OUT <= D_IN;

        end if;

end if;

end process FLOP;

end FLIP_FLOP; -- end of architecture