Modelsim Low and High violations

When simulating a post-routed design in ModelSim, I get a number of setup, hold, recovery violations such as:

# ** Warning: /X_FF SETUP Low VIOLATION ON CE WITH RESPECT TO CLK;

Can somebody explain what does "Low VIOLATION" mean? and what's the difference between this and "High VIOLATION"?

Is this with respect to signal levels? or is it an indication of the degree of violation?

Thank you.

Reply to
M. Hamed
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