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-- Company: 

-- Engineer: 

-- 

-- Create Date:    10:16:23 10/19/2014 

-- Design Name: 

-- Module Name:    clk_mod - Behavioral 

-- Project Name: 

-- Target Devices: 

-- Tool versions: 

-- Description: 

--

-- Dependencies: 

--

-- Revision: 

-- Revision 0.01 - File Created

-- Additional Comments: 

--

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library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

--use IEEE.NUMERIC_STD.ALL;

library UNISIM;

use UNISIM.VComponents.all;

entity clk_mod is

    Port ( CLK_50MHz_IN         : in  STD_LOGIC;

           CLK_25Mhz_OUT        : out  STD_LOGIC);

end clk_mod;

architecture Behavioral of clk_mod is

signal clk0_div2out_bufg, clk0_2xout_tmp, clk0_2xout_bufg :std_logic:='0';

begin

        --CLK_100Mhz_OUT <= clk0_2xout_bufg;

        U0_BUFG : BUFG

    port map (I => clk0_2xout_tmp, O => clk0_2xout_bufg);

        U1_BUFG : BUFG

    port map (I => clk0_div2out_bufg, O => CLK_25Mhz_OUT);

        DCM_SP_inst : DCM_SP

   generic map (

      CLKDV_DIVIDE => 2.0,                   -- CLKDV divide value (1.5,2,2.5,3,3.5,4,4.5,5,5.5,6,6.5,7,7.5,8,9,10,11,12,13,14,15,16).

      CLKFX_DIVIDE => 1,                     -- Divide value on CLKFX outputs - D - (1-32)

      CLKFX_MULTIPLY => 2,                   -- Multiply value on CLKFX outputs - M - (2-32)

      CLKIN_DIVIDE_BY_2 => FALSE,            -- CLKIN divide by two (TRUE/FALSE)

      CLKIN_PERIOD => 20.0,                  -- Input clock period specified in nS

      CLKOUT_PHASE_SHIFT => "NONE",          -- Output phase shift (NONE, FIXED, VARIABLE)

      CLK_FEEDBACK => "2X",                  -- Feedback source (NONE, 1X, 2X)

      DESKEW_ADJUST => "SYSTEM_SYNCHRONOUS", -- SYSTEM_SYNCHRNOUS or SOURCE_SYNCHRONOUS

      DFS_FREQUENCY_MODE => "LOW",           -- Unsupported - Do not change value

      DLL_FREQUENCY_MODE => "LOW",           -- Unsupported - Do not change value

      DSS_MODE => "NONE",                    -- Unsupported - Do not change value

      DUTY_CYCLE_CORRECTION => TRUE,         -- Unsupported - Do not change value

      FACTORY_JF => X"c080",                 -- Unsupported - Do not change value

      PHASE_SHIFT => 0,                      -- Amount of fixed phase shift (-255 to 255)

      STARTUP_WAIT => FALSE                  -- Delay configock frequency clock output

                )

   port map (

      CLK2X180 => open,                                 -- 1-bit output: 2X clock frequency, 180 degree clock output

      CLK90     => open,                -- 1-bit output: 90 degree clock output

      CLKDV     => clk0_div2out_bufg,  -- 1-bit output: Divided clock output

      CLKFX     => open,                -- 1-bit output: Digital Frequency Synthesizer output (DFS)

      CLKFX180 => open,                                 -- 1-bit output: 180 degree CLKFX output

      LOCKED    => open,                        -- 1-bit output: DCM_SP Lock Output

      PSDONE    => open,                        -- 1-bit output: Phase shift done output

      STATUS    => open,                        -- 8-bit output: DCM_SP status output

      CLKFB     => clk0_2xout_bufg,  -- 1-bit input: Cl DONE until DCM_SP LOCKED (TRUE/FALSE)

      CLK0              => open,  -- 1-bit output: 0 degree clock output

      CLK180    => open,                        -- 1-bit output: 180 degree clock output

      CLK270    => open,                        -- 1-bit output: 270 degree clock output

      CLK2X     => clk0_2xout_tmp,   -- 1-bit output: 2X clock feedback input

      CLKIN     => CLK_50MHz_IN,     -- 1-bit input: Clock input

      DSSEN     => '0',                          -- 1-bit input: Unsupported, specify to GND.

      PSCLK     => '0',                          -- 1-bit input: Phase shift clock input

      PSEN              => '0',                  -- 1-bit input: Phase shift enable

      PSINCDEC => '0',                                   -- 1-bit input: Phase shift increment/decrement input

      RST               => '0'                   -- 1-bit input: Active high reset input

   );

end Behavioral;