why timing simu fails while post PAR rpts no timing errors??

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gauz

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Hi, Everyone
I implemented my design in xilinx spartn3, PAR is ok, no timing violation reports after STA, but when I run timing simulation with the simulaltion file generated by ISE, the X_FF(which is a cell in lib simprims_ver) report setup and hold violation.
I am puzzled and don't know why it happens, Could anyone give me any ideas???
Thanks so much!
gauz
 

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