Description
Due to a problem in the EPE (Early Power Estimator) and QPA (Quartus Power Analyzer), you may see underestimated DSP power when DSPs are instantiated in 27x27 mode but the input numbers are 9 or 12 bits only. The 9x9 and 12x12 multipliers are handled properly in other DSP modes.
Resolution
To work around this problem, instantiate the DSPs in 18x18 mode when the input numbers are 9 or 12 bits as the QPA and EPE provide an accurate power estimation in 18x18 mode.