Simulation Warning


I am getting following warning during simulation in ModelSim

  • Warning: *DFE3C RECOVERY High VIOLATION ON CLR WITH RESPECT TO CLK; # Expected := 1 ns; Observed := 0 ns; At : 61005 ns # Time: 61005 ns Iteration: 1

Can any one tell what is RECOVERY High VIOLATION. Thank for any help


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Recovery time is the period of time following a clock that an asynchronous input must remain stable. It is similar to hold time, but for async inputs.

This warning looks like it came from a flip flop model that is telling you that its asynchronous CLR pin wiggled too soon after the rising edge of CLK for the flip flop to operate properly.


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Chris Alexander

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