Subversion Repositories common_components

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

--

-- Copyright (C) 2009

-- ASTRON (Netherlands Institute for Radio Astronomy) <http://www.astron.nl/>

-- P.O.Box 2, 7990 AA Dwingeloo, The Netherlands

--

-- This program 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.

--

-- This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

--

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

LIBRARY IEEE, common_pkg_lib;

USE IEEE.std_logic_1164.ALL;

USE IEEE.numeric_std.ALL;

USE common_pkg_lib.common_pkg.ALL;

ENTITY common_pipeline_sl IS

  GENERIC (

    g_pipeline       : NATURAL := 1;  -- 0 for wires, > 0 for registers, 

    g_reset_value    : NATURAL := 0;  -- 0 or 1, bit reset value,

    g_out_invert     : BOOLEAN := FALSE

  );

  PORT (

    rst     : IN  STD_LOGIC := '0';

    clk     : IN  STD_LOGIC;

    clken   : IN  STD_LOGIC := '1';

    in_clr  : IN  STD_LOGIC := '0';

    in_en   : IN  STD_LOGIC := '1';

    in_dat  : IN  STD_LOGIC;

    out_dat : OUT STD_LOGIC

  );

END common_pipeline_sl;

ARCHITECTURE str OF common_pipeline_sl IS

  SIGNAL in_dat_slv  : STD_LOGIC_VECTOR(0 DOWNTO 0);

  SIGNAL out_dat_slv  : STD_LOGIC_VECTOR(0 DOWNTO 0);

BEGIN

  in_dat_slv(0) <= in_dat WHEN g_out_invert=FALSE ELSE NOT in_dat;

  out_dat       <= out_dat_slv(0);

  u_sl : ENTITY work.common_pipeline

  GENERIC MAP (

    g_representation => "UNSIGNED",

    g_pipeline       => g_pipeline,

    g_reset_value    => sel_a_b(g_out_invert, 1-g_reset_value, g_reset_value),

    g_in_dat_w       => 1,

    g_out_dat_w      => 1

  )

  PORT MAP (

    rst     => rst,

    clk     => clk,

    clken   => clken,

    in_clr  => in_clr,

    in_en   => in_en,

    in_dat  => in_dat_slv,

    out_dat => out_dat_slv

  );

END str;