Quartus

Formal verification may give mismatches -- Perform gate-level register retiming is turned on


CAUSE: You turned on Perform gate-level register retiming, specified a formal verification tool for the current project, and compiled the design. However, formal verification may give mismatches between the pre- and post-Quartus II netlists if the logic feeding registers is modified in the design due to this option.
ACTION: Turn off Perform gate-level register retiming and recompile the design.

See also:

Optimizing Netlists During Synthesis & Fitting
Specifying EDA Tool Settings

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