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-- $Id: dcm_sfs_unisim_s3e.vhd 649 2015-02-21 21:10:16Z mueller $ -- -- Copyright 2010-2011 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de> -- -- This program is free software; you may redistribute and/or modify it under -- the terms of the GNU General Public License as published by the Free -- Software Foundation, either version 2, 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 complete details. -- ------------------------------------------------------------------------------ -- Module Name: dcm_sfs - syn -- Description: DCM for simple frequency synthesis; SPARTAN-3E version -- Direct instantiation of Xilinx UNISIM primitives -- -- Dependencies: - -- Test bench: - -- Target Devices: generic Spartan-3A,-3E; Spartan-6 -- Tool versions: xst 12.1-14.7; ghdl 0.29-0.31 -- -- Revision History: -- Date Rev Version Comment -- 2011-11-17 426 1.0.3 rename dcm_sp_sfs -> dcm_sfs, SPARTAN-3E version -- 2011-11-10 423 1.0.2 add FAMILY generic, SPARTAN-3 support -- 2010-11-12 338 1.0.1 drop SB_CLK generic; allow DIV=1,MUL=1 without DCM -- 2010-11-07 337 1.0 Initial version ------------------------------------------------------------------------------ library ieee; use ieee.std_logic_1164.all; library unisim; use unisim.vcomponents.ALL; use work.slvtypes.all; entity dcm_sfs is -- DCM for simple frequency synthesis generic ( CLKFX_DIVIDE : positive := 1; -- FX clock divide (1-32) CLKFX_MULTIPLY : positive := 1; -- FX clock multiply (2-32) (1->no DCM) CLKIN_PERIOD : real := 20.0); -- CLKIN period (def is 20.0 ns) port ( CLKIN : in slbit; -- clock input CLKFX : out slbit; -- clock output (synthesized freq.) LOCKED : out slbit -- dcm locked ); end dcm_sfs; architecture syn of dcm_sfs is begin assert (CLKFX_DIVIDE=1 and CLKFX_MULTIPLY=1) or CLKFX_MULTIPLY>=2 report "assert((FX_DIV=1 and FX_MULT)=1 or FX_MULT>=2" severity failure; DCM0: if CLKFX_DIVIDE=1 and CLKFX_MULTIPLY=1 generate CLKFX <= CLKIN; LOCKED <= '1'; end generate DCM0; DCM1: if CLKFX_MULTIPLY>=2 generate DCM : dcm_sp generic map ( CLK_FEEDBACK => "NONE", CLKFX_DIVIDE => CLKFX_DIVIDE, CLKFX_MULTIPLY => CLKFX_MULTIPLY, CLKIN_DIVIDE_BY_2 => false, CLKIN_PERIOD => CLKIN_PERIOD, CLKOUT_PHASE_SHIFT => "NONE", DESKEW_ADJUST => "SYSTEM_SYNCHRONOUS", DSS_MODE => "NONE") port map ( CLKIN => CLKIN, CLKFX => CLKFX, LOCKED => LOCKED ); end generate DCM1; end syn;