Xilinx translate error : Cannot find signal "clk"

[Rakesh Sharma]

Hi,

I am getting the following error in Xilinx:-

Annotating constraints to design from file "musicmp3.ucf" ...
ERROR:NgdBuild:755 - Line 2 in 'musicmp3.ucf': Could not find net(s) 'rxd' in
the design. To suppress this error use the -aul switch, specify the correct
net name or remove the constraint.
ERROR:NgdBuild:755 - Line 4 in 'musicmp3.ucf': Could not find net(s) 'clk' in
the design. To suppress this error use the -aul switch, specify the correct
net name or remove the constraint.
ERRORarsers:11 - Encountered unrecognized constraint while parsing.
ERROR:NgdBuild:19 - Errors found while parsing constraint file "musicmp3.ucf".

Writing NGDBUILD log file "musicmp3.bld"...


The UCF file looks like :-

#PACE: Start of Constraints extracted by PACE from the Design
NET "rxd" LOC = "P202" ;
NET "pwm_output" LOC = "P110" ;
NET "clk" LOC = "P80" ;


The code goes like this :-

library IEEE;
use IEEE.STD_LOGIC_1164.all;
use IEEE.std_logic_arith.all;
use IEEE.std_logic_misc.all;
use work.functions.all;


ENTITY musicmp3 IS
PORT (
clk : IN std_logic;
RxD : IN bit;
PWM_output : OUT bit);
END musicmp3;

ARCHITECTURE translated OF musicmp3 IS

COMPONENT async_receiver
PORT (
clk : IN std_logic;
RxD : IN bit;
RxD_data_ready : OUT bit;
RxD_data : OUT bit_vector(7 DOWNTO 0);
RxD_endofpacket : OUT bit;
RxD_idle : OUT bit);
END COMPONENT;


SIGNAL RxD_data_ready : bit;
SIGNAL RxD_data : bit_vector(7 DOWNTO 0);
SIGNAL RxD_data_reg : bit_vector(7 DOWNTO 0);
SIGNAL tmp : bit_vector(7 DOWNTO 0);
SIGNAL PWM_accumulator : bit_vector(8 DOWNTO 0);
SIGNAL PWM_output_xhdl1 : bit;


BEGIN
PWM_output <= PWM_output_xhdl1;
deserialer : async_receiver
PORT MAP (
clk => clk,
RxD => RxD,
RxD_data_ready => RxD_data_ready,
RxD_data => RxD_data);


PROCESS
BEGIN
WAIT UNTIL (clk'EVENT AND clk = '1');
IF (RxD_data_ready = '1') THEN
RxD_data_reg <= RxD_data;
END IF;
END PROCESS;


PROCESS
VARIABLE s : BIT_VECTOR(7 downto 0);
VARIABLE DInt : INTEGER := 0;
VARIABLE EInt : INTEGER := 0;
BEGIN
WAIT UNTIL (clk'EVENT AND clk = '1');
-- PWM_accumulator <= "0" & PWM_accumulator(7 DOWNTO 0) + RxD_data_reg;

s := PWM_accumulator(7 DOWNTO 0);
DInt := to_integer(s);
EInt := to_integer(RxD_data_reg);

DInt := DInt + EInt;

PWM_accumulator <= to_bit(9, DInt);

END PROCESS;
PWM_output_xhdl1 <= PWM_accumulator(8) ;

END translated;


What can be wrong? Thanks in advance