Falling edge skew on Encounter

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int19

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Hi all!
I try to explain wich is my problem.
I have a register file in wich writing a register is done on falling edge, but in the other modules of the DSP each operation occurs on rising edge.
When Encounter performs timing analysis it results a skew of about half cycle just on the register file. Is there any way to tell encounter to not consider this skew as negative?
I hope have been clear,
regards.
 

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