How to provide clock skew in VHDL ??

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Avii13

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I have written a VHDL code for PRBS. Its working fine.
Now i want to add clock skew to know the threshold value of delay after which PRBS will not work. Say clock reach at FF1 at T time and the same clock reach at FF2 at T+t1 time.
I used

process
begin
WAIT FOR 20ps ;
if clk'event and clk = '1' then

q <= d ;
end if;
end process ;

but its not working
How can I add this "t1" delay in clock in VHDL.?? Please sugeest
 

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