--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 = POINTER_10 --
-- version = 1.0 --
-- last update = 9/05/00 --
-- author = Jose Nunez --
--------------------------------------
-- FUNCTION
-- first pointer
-- PIN LIST
-- PREVIOUS = data from the previous location in the pointer array
-- MOVE = select if load data or keep current data
-- CLEAR = asynchronous clear of the data latches (active LOW)
-- CLK = master clock
-- DOUT = output of the data latches
library ieee;
use ieee.std_logic_1164.all;
entity POINTER_10 is
port
(
PREVIOUS : in bit_vector(3 downto 0);
MOVE : in bit;
CLEAR : in bit ;
RESET : in bit;
CLK : in bit ;
DOUT : out bit_vector(3 downto 0)
);
end POINTER_10;
architecture POINTER1 of POINTER_10 is
signal DOUT_AUX : bit_vector(3 downto 0);
begin
FLIP_FLOPS : process (CLK,CLEAR)
begin
if (CLEAR = '0') then
DOUT_AUX <= "1010";
elsif ((CLK'event) and (CLK = '1')) then
if (RESET = '0') then
DOUT_AUX <= "1010";
elsif (MOVE = '1') then
DOUT_AUX <= PREVIOUS;
else
DOUT_AUX <= DOUT_AUX;
end if;
end if;
end process FLIP_FLOPS;
DOUT <= DOUT_AUX;
end POINTER1;
