how can i execute delay time??

[moh_monem43]

How can I make simulation for inertial delay and transport delay?
I tried to execute these examples

Library ieee;
Use ieee.std_logic_1164.all;
Entity buf is
Port (a : in std_logic;
B : out std_logic);
End buf;
Architecture buf of buf is
Begin
b <= a after 20 ns;
end buf;



library ieee;
use ieee.std_logic_1164.all;
entity delay_line is
port (a : in std_logic;
b : out std_logic);
end delay_line;

architecture delay_line of delay_line is
begin
b <= transport a after 20 ns;
end delay line;

when simulated previous two examples, delay time didn’t appear on signals. Why??
I used MAX 7000S family

 

[FrankCh]

If you have a model which works, use it until the end. Both the examples you posted ain't going to go into logic, you need to set additional timing constraints in Altera software in order to infer a 20ns delay line.

 

[moh_monem43]

thx FrankCh for your concern
but, how can i make additional timing constraints in @ltera software ??