I'm trying to multiply the frequency of spartan-3e 1600k microblaze dev kit using the DCM core generator with no success.
here is my simple code:

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.NUMERIC_STD.ALL;

library UNISIM;
use UNISIM.VComponents.all;

entity pulsegen is
    Port ( clkin    : in  STD_LOGIC;
           pulseOut : out STD_LOGIC);
end pulsegen;

architecture Behavioral of pulsegen is
	COMPONENT myDCM
	PORT(
		CLKIN_IN : IN std_logic;          
		CLKFX_OUT : OUT std_logic;
		CLKIN_IBUFG_OUT : OUT std_logic;
		CLK0_OUT : OUT std_logic
		);
	end component;

signal clkfxout, xxx, clk0out, cigo : std_logic;
begin
	Inst_myDCM: myDCM PORT MAP(
		CLKIN_IN => clkin,
		CLKFX_OUT => clkfxout,
		CLKIN_IBUFG_OUT => open,
		CLK0_OUT => open
	);
	process (clkfxout)
		begin
			if rising_edge(clkfxout) then
				xxx <= (xxx xor '1');
			end if;
		end process;
	pulseOut <= xxx;
end Behavioral;

 

the synthesizer gives me these wanings:
WARNING:Xst:753 - "C:/Projects2012/spartan3e brd/DCM/DCMtry1/try1/try1/pulsegen.vhd" line 25: Unconnected output port 'CLKIN_IBUFG_OUT' of component 'myDCM'.
WARNING:Xst:753 - "C:/Projects2012/spartan3e brd/DCM/DCMtry1/try1/try1/pulsegen.vhd" line 25: Unconnected output port 'CLK0_OUT' of component 'myDCM'.
WARNING:Xst:2211 - "C:/Projects2012/spartan3e brd/DCM/DCMtry1/try1/try1/pulsegen.vhd" line 25: Instantiating black box module <myDCM>.
WARNING:Xst:1780 - Signal <clk0out> is never used or assigned. This unconnected signal will be trimmed during the optimization process.
WARNING:Xst:1780 - Signal <cigo> is never used or assigned. This unconnected signal will be trimmed during the optimization process.
However when I implement the design I get this error message:
ERROR:NgdBuild:604 - logical block 'Inst_myDCM' with type 'myDCM' could not be
resolved. A pin name misspelling can cause this, a missing edif or ngc file,
case mismatch between the block name and the edif or ngc file name, or the
misspelling of a type name. Symbol 'myDCM' is not supported in target
'spartan3e'.
I read the xapp462 which quite nicely describes the DCM but there is no examples how to uses it.
Mahmood