Программируемая логика и ЦОС

Executing C:\Xilinx\10.1\ISE\bin\nt\map.exe  -p 2VPX20FF896-5 -o "map.ncd"  -k  4  -cm area  -c 100  -tx off "top.ngd" "top.pcf"
Release 10.1 - Map K.31 (nt)
Copyright (c) 1995-2008 Xilinx, Inc.  All rights reserved.
Using target part "2vpx20ff896-5".
Mapping design into LUTs...
Writing file map.ngm...
Running directed packing...
Pack:1107 - Unable to combine the following symbols into a single IOB
   component:
   	BUF symbol "PLL_BACK_OBUF" (Output Signal = PLL_BACK)
   	PAD symbol "PLL_BACK" (Pad Signal = PLL_BACK)
   A generic IO component of type IOB was chosen because the IO contains symbols
   and/or properties consistent with input, output, or bi-directional usage and
   contains no other symbols or properties that require a more specific IO
   component type.
   Each of the following constraints specifies an illegal physical site for a
   component of type IOB:
   	Symbol "PLL_BACK" (LOC=G16 [Physical Site Type = CLK_N])
   The component type is determined by the types of logic and the properties and
   configuration of the logic it contains. Please double check that the types of
   logic elements and all of their relevant properties and configuration options
   are compatible with the physical site type of the constraint.
   Please correct the constraints accordingly.
Pack:1107 - Unable to combine the following symbols into a single IOB
   component:
   	BUF symbol "NMI_OBUF" (Output Signal = NMI)
   	PAD symbol "NMI" (Pad Signal = NMI)
   A generic IO component of type IOB was chosen because the IO contains symbols
   and/or properties consistent with input, output, or bi-directional usage and
   contains no other symbols or properties that require a more specific IO
   component type.
   Each of the following constraints specifies an illegal physical site for a
   component of type IOB:
   	Symbol "NMI" (LOC=F16 [Physical Site Type = CLK_P])
   The component type is determined by the types of logic and the properties and
   configuration of the logic it contains. Please double check that the types of
   logic elements and all of their relevant properties and configuration options
   are compatible with the physical site type of the constraint.
   Please correct the constraints accordingly.
<pre>

top.vhd
entity top is
port(
........................
PLL_BACK : out std_logic;
NMI : out std_logic;
........................);
component sys_control
port(
........................
NMI : out std_logic;
........................);
component pll_cpu
port(
CLK_IN : in std_ulogic;
FEEDBACK : in std_ulogic;
RESET : in std_ulogic;
PIN_OUT : out std_ulogic;
LOCKED : out std_ulogic);
end component;
pll_cpu_insertion : pll_cpu port map
( CLK_IN => PLL_XC_L,
FEEDBACK => PLL_XC_H,
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ISE 10: Pack:1107 - Unable to combine the following symbols into a single IOB ... («... Page 1 of 3
http://www.telesys …9/messages/33639.shtml 12.11.2008
PIN_OUT => PLL_BACK,
RESET => '0',
LOCKED => PLL_LOCKED
);
sys_control_insertion : sys_control
port map(
NMI => NMI,
pll_cpu.vhd
library IEEE;
use IEEE.std_logic_1164.all;
Library UNISIM;
use UNISIM.vcomponents.all;
entity pll_cpu is
port(
CLK_IN : in std_logic;
FEEDBACK : in std_logic;
RESET : in std_logic;
LOCKED : out std_logic;
PIN_OUT : out std_logic
);
end pll_cpu;
architecture pll_cpu of pll_cpu is
component BUFG
port (
I : in std_logic;
O : out std_logic
);
end component;
component DCM
generic(
CLKDV_DIVIDE : REAL := 2.0;
CLKFX_DIVIDE : INTEGER := 1;
CLKFX_MULTIPLY : INTEGER := 4;
CLKIN_DIVIDE_BY_2 : BOOLEAN := FALSE;
CLKIN_PERIOD : REAL := 0.0;
CLKOUT_PHASE_SHIFT : STRING := "NONE";
CLK_FEEDBACK : STRING := "1X";
DESKEW_ADJUST : STRING := "SYSTEM_SYNCHRONOUS";
DFS_FREQUENCY_MODE : STRING := "LOW";
DLL_FREQUENCY_MODE : STRING := "LOW";
DSS_MODE : STRING := "NONE";
DUTY_CYCLE_CORRECTION : BOOLEAN := TRUE;
FACTORY_JF : BIT_VECTOR := X"C080";
PHASE_SHIFT : INTEGER := 0;
STARTUP_WAIT : BOOLEAN := FALSE
);
port (
CLKFB : in std_logic := '0';
CLKIN : in std_logic := '0';
DSSEN : in std_logic := '0';
PSCLK : in std_logic := '0';
PSEN : in std_logic := '0';
PSINCDEC : in std_logic := '0';
RST : in std_logic := '0';
CLK0 : out std_logic := '0';
CLK180 : out std_logic := '0';
CLK270 : out std_logic := '0';
CLK2X : out std_logic := '0';
CLK2X180 : out std_logic := '0';
CLK90 : out std_logic := '0';
CLKDV : out std_logic := '0';
CLKFX : out std_logic := '0';
CLKFX180 : out std_logic := '0';
LOCKED : out std_logic := '0';
PSDONE : out std_logic := '0';
STATUS : out STD_LOGIC_VECTOR(7 downto 0) := "00000000"
);
end component;
signal NET345 : std_logic;
begin
U1 : DCM
port map(
CLKFB=> FEEDBACK,
CLKIN=> NET345,
DSSEN=> '0',
PSCLK=> '0',
PSEN=> '0',
PSINCDEC=> '0',
RST=> RESET,
CLK0=> PIN_OUT,
CLK90=> OPEN,
CLK180=> OPEN,
CLK270=> OPEN,
CLK2x=> OPEN,
CLK2x180=> OPEN,
CLKDV=> OPEN,
CLKFX=> OPEN,
CLKFX180=> OPEN,
STATUS=> OPEN,
PSDONE=> OPEN,
LOCKED=> LOCKED
);
U2 : BUFG
port map(
I => CLK_IN,
O => NET345
ISE 10: Pack:1107 - Unable to combine the following symbols into a single IOB ... («... Page 2 of 3
http://www.telesys …9/messages/33639.shtml 12.11.2008
);
end pll_cpu;