Honored ContributorI used power analyzer tool to estimate the power consumption of my design (a vcd file). I find the current flow into VCCINT is nearly 7mA, Since I inserted a resistor in the power supply rail of the VCCINT, and I measured the current flow through the resistor is nearly 12mA. Can someone tell me why there is a big difference between these two values? Thank you very much.
Honored ContributorIt could be because the estimates you gave the power analyser tool (especially toggle rates) where a bit optimistic.
Honored ContributorThank you for your reply! Except the toggle rate, what else will cause this difference? If there are some references where I can have a look will be better. I have another question. If I changed my microcontroller, like reducing the number of registers, in the theory, Should there be some change in these current values? But I find these values nothing change. When I reduce some registers or reduce some instructions, or even reduce a hardware multiplier. I am not should if I did the wrong thing. Thank you for helping!
Honored Contributoryou should change Assignments > Settings > Operating Conditions from Typical to Maximum
Honored ContributorThank you for your reply! What about the second question? If I changed my microcontroller, like reducing the number of registers, in the theory, Should there be some change in these current values? Or since it consider the worest situation, there is no difference? Thank you!
Honored Contributoryes, resource utilization will affect power consumption
Honored ContributorThank you for your reply! But when I use power analyzer tool to estmate the different VCD file, the current drawn throw the VCCINT isnot change, Do you know why? Thank you!
Honored ContributorDoes the actual number of registers change after compilation and optimization? You can see it in the fitter report. How important is the change?
Honored ContributorAnd how much of the vccint current is static/dynamic?
Honored ContributorYes, there are significant register change in the fitter report. static is 1.46mA, while dynamic is 1.93mA. Thank you!
Honored ContributorAre all your clocks properly defined? I think you should see them somewhere in the Timequest report, there is a list of clock with their frequencies.
