Reply To: Error in VHDL Simulation using Xilinx ISE

sir,
I have generated VHDL code for the two input XOR gate. Below is the test bench code of the xor gate. I have also attached the figure of waveform.It is showing Unknown value U for clk and output O.

test bench file-

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.components_pnml.all;
use work.definitions_pnml.all;

entity tb_pNML_custom_XORNEW is
end tb_pNML_custom_XORNEW;

architecture Behavioural of tb_pNML_custom_XORNEW is

signal CLK : std_logic;
signal O :std_logic;
signal O_param : param_data := (others => 0.0);
signal X :std_logic;
signal X_param : param_data := (others => 0.0);
signal Y :std_logic;
signal Y_param : param_data := (others => 0.0);

component pNML_custom_XORNEW is
port(
	O: out std_logic;
	O_param: out param_data := (others => 0.0);
	X: in std_logic;
	X_param: in param_data := (others => 0.0);
	Y: in std_logic;
	Y_param: in param_data := (others => 0.0);
	CLK: in std_logic);
end component;

begin

DUT : pNML_custom_XORNEW port map(O => O, O_param => O_param, 
X => X, X_param => X_param, 
Y => Y, Y_param => Y_param, 
CLK => CLK);

 clock_proc:process
 begin
 CLK<='1';
  wait for t_clock * 1 sec;
  CLK<='0';
  wait for t_clock * 1 sec;
end process clock_proc; 
  clk <= not clk after 10 ns;
input_proc: process
begin
 --insert your input stimuli here 

X<='0';
wait for t_clock * 1 sec;
Y<='1';
wait for t_clock * 1 sec;
end process input_proc;

end Behavioural;

• This reply was modified 7 years, 10 months ago by Fabrizio. Reason: please use the code tag when posting vhdl code