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

Farabi, I am attaching the csv from Early Power Estimator. I don't see a place in the tool for me to load a .csv as input to EPE. My choices are to input a VCD or to specify the default toggle rate, which is what I did. I do notice in the EPE it does recognize the 18b multiply and that the output is registered. It shows no register on the input (the data is registered elsewhere prior to the multiply) or pipeline register, so maybe that is what is causing the zero toggle rate to be assumed? I can experiment by turning on extra registers in the multiplier to see if that fixes the power estimate, but since the design easily meets timing, I don't want to add two pipeline delays permanently to the design.

Farabi's avatar
Farabi
Icon for Regular Contributor rankRegular Contributor
3 years ago

Hello Susan,

I load your .csv file into MAX10 EPE and the power estimator calculates the power estimation correctly.

To download MAX10 EPE : https://www.intel.com/content/www/us/en/support/programmable/support-resources/power/mxv-power-est-download.html

I attached the EPE for your convenience.

Open the EPE , then load csv file like below pic:

The calculation will executed right after you load the .csv file into EPE. Then go to report tab to see the result.

regards,
Farabi