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SusanB's avatar
SusanB
Icon for New Contributor rankNew Contributor
3 years ago

How to fix Power Estimation Confidence: Low: user provided insufficient toggle rate data

In my design, I have a 6b x 12b multiplier that is inferred from code that is essentially if(rising_edge(clock)) then if (clock_enable = '1') then result <= num_6b * num_12b; end if...
sstrell's avatar
sstrell
Icon for Super Contributor rankSuper Contributor
3 years ago

Did you properly set up a .sdc file with clock constraints defining this information? And did you enable the vectorless estimation option in the Power Analyzer?

Using the default toggle rate will always give you the low confidence metric. You need to supply more detailed info, such as a .vcd file from a simulation or manually create Power Toggle Rate or Power Toggle Rate Percentage assignments.