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[/] [xmatchpro/] [trunk/] [xmw4-comdec/] [src/] [ff_v3_delay.vhd] - Rev 8
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--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 = FF_V3_DELAY -- -- version = 1.0 -- -- last update = 11/04/00 -- -- author = Jose Nunez -- --------------------------------- -- FUNCTION -- Introduces an extra level of delay for the decompression counter -- PIN LIST -- COUNT_D_IN : in enable count signal -- CLK : in clock signal -- CLEAR : in clear signal -- COUNT_D_OUT : out enable count signal library ieee; use ieee.std_logic_1164.all; entity FF_V3_DELAY is port ( COUNT_D_IN : in bit; CLK : in bit; CLEAR : in bit; RESET : in bit; COUNT_D_OUT : out bit ); end FF_V3_DELAY; architecture FF of FF_V3_DELAY is signal Q1,Q2 : bit; begin FLIP_FLOP1 : process(CLK,CLEAR) begin if (CLEAR = '0') then Q1 <= '1'; elsif ((CLK'event) and (CLK='1')) then if (RESET = '0') then Q1 <= '1'; else Q1 <= COUNT_D_IN; end if; end if; end process FLIP_FLOP1; FLIP_FLOP2 : process(CLK,CLEAR) begin if (CLEAR = '0') then Q2 <= '1'; elsif ((CLK'event) and (CLK='1')) then if (RESET = '0') then Q2 <= '1'; else Q2 <= Q1; end if; end if; end process FLIP_FLOP2; COUNT_D_OUT <= Q2; end FF;