Device Family: Intel® Stratix® 10

Type: Answers

Area: Power


Last Modified: January 05, 2018
Version Found: v17.0
Bug ID: FB: 493281;

Why does Intel® Stratix® 10 EPE or QPA report lower DSP power when DSPs are instantiated in 27x27 mode?

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.

Workaround/Fix

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.