no clock signals found ... xilinx ise

[geoffrey wall]

I have a top level design with a clock
this clock goes into an into a DCM
and then into a submodule where the dcm divided clock is monitored
with a process statement. and is used with a rising_edge(clk) statement
as well

yet ISE (XST) still tells me there is no input clock signal
what the heck is going on?
do i need to change some synthesis settings?
please help

code below:


library ieee;
use ieee.std_logic_1164.all;
use IEEE.std_logic_unsigned.all;
use ieee.numeric_std.all;
-- synthesis translate_off
library UNISIM;
use UNISIM.VCOMPONENTS.all;
-- synthesis translate_on
library XilinxCoreLib;


-- V2P has 198 KB of BRAM
--roughly 50,000 double words

entity system is
port (
OPB_Clk : in std_logic; --driven by 100mhz clk

SYS_RESET : in std_logic;

-- all these are big endian
A : out std_logic_vector(0 to 31); --A, OE, WE, D are shared flash
& sram
OE_L : out std_logic;
--WE_L : buffer std_logic;
WE_L : out std_logic;
D : inout std_logic_vector(0 to 31);

SRAM_CS_L : inout std_logic;
SRAM_BS_L : out std_logic_vector(0 to 3); -- "bs" signals control
"BLE#" and "BHE#"

TRGT_IRQ : in std_logic;

SYS_ACE_CS_N : out std_logic; -- data buffer enable
GPIO_CS_N : out std_logic -- data buffer enable

);
end system;


architecture structural of system is


component IBUFG
port
(
O : out std_ulogic;
I : in std_ulogic
);
end component;

component DCM_INST
port
(
CLKIN_IN : in std_logic;
RST_IN : in std_logic;
CLKDV_OUT : out std_logic;
CLKIN_IBUFG_OUT : out std_logic;
CLK0_OUT : out std_logic;
LOCKED_OUT : out std_logic
);
end component;

component BUFG
port(
O : out std_ulogic;
I : in std_ulogic
);
end component;

-- internal block ram to store read data
-- must convert to little endian when plugging in address

component sub_sys is
port
(
clk : in std_logic; --driven by 100mhz clk
A : out std_logic_vector(0 to 31); --A,
OE, WE, D are shared flash & sram
D : inout std_logic_vector(0 to 31);
TRGT_IRQ : in std_logic
);
end component;

--------------------------------------------------------------------------------
-- internal signals
--------------------------------------------------------------------------------
signal opb_clk_int : std_logic;
signal clk_div_buf : std_logic;
signal opb_clk_buf : std_logic;
signal dcm_clk0_buf : std_logic;
signal locked : std_logic;
signal dcm_clk0 : std_logic;
signal dcm_clkdv : std_logic;

begin


--------------------------------------------------------------------------------
-- instantiations
--------------------------------------------------------------------------------

sub_system : sub_sys
port map
(
clk => clk_div_buf,
A => A,
D => D,
TRGT_IRQ => TRGT_IRQ
);

buffered_100 : BUFG
port map
(
I => DCM_CLK0,
O => DCM_CLK0_BUF
);

buffered_50 : BUFG
port map
(
I => DCM_CLKDV,
O => clk_div_buf --DCM_CLKDV_BUF
);

Inst_DCM_INST : DCM_INST port map
(
CLKIN_IN => OPB_Clk,
RST_IN => SYS_RESET,
CLKDV_OUT => DCM_CLKDV,
CLKIN_IBUFG_OUT => opb_clk_int,
CLK0_OUT => DCM_CLK0,
LOCKED_OUT => locked
);

SYS_ACE_CS_N <= '1'; --disable data buffer when system
ace is not used
GPIO_CS_N <= '1'; --to prevent the buffer from driving
the bus (B -> A)


WE_L <= '1';
OE_L <= '1';

SRAM_BS_L(0 to 3) <= "1111";
SRAM_CS_L <= '1';



end architecture;




--
Geoffrey Wall
Masters Student in Electrical/Computer Engineering
Florida State University, FAMU/FSU College of Engineering
wallge@eng.fsu.edu
Cell Phone:
850.339.4157

ECE Machine Intelligence Lab
http://www.eng.fsu.edu/mil
MIL Office Phone:
850.410.6145

Center for Applied Vision and Imaging Science
http://cavis.fsu.edu/
CAVIS Office Phone:
850.645.2257



--
Geoffrey Wall
Masters Student in Electrical/Computer Engineering
Florida State University, FAMU/FSU College of Engineering
wallge@eng.fsu.edu
Cell Phone:
850.339.4157

ECE Machine Intelligence Lab
http://www.eng.fsu.edu/mil
MIL Office Phone:
850.410.6145

Center for Applied Vision and Imaging Science
http://cavis.fsu.edu/
CAVIS Office Phone:
850.645.2257

 

[Neo]

Try adding the clock attribute to the input clock port. Sometimes the
tool misses or is unable to recognise the derived clock is from the
main clock.