01-02-2018 08:49 AM
hi community, i would really like to know which voltage of this ones will affect the static power in the FPGA?
as you know P(static)=V*I(leakage) so that means if we vary the voltage the static power will be varied!!
01-02-2018 09:25 AM
Any voltage supply will affect static power.
The supply with the highest static current (vccint) will see the greatest increase in current as voltage increases.
CAUTION: ALWAYS be sure you stay within the recommended supply voltages (Table 2, datasheet).
NEVER EXCEED the absolute maximum stated in Table 1.
Use the power estimator spreadsheet to see how static current increases with voltages and junction temperature,
01-03-2018 03:44 AM
hi @austin, first thanks for replying.
yeah i tried to varied the junction temperture too, and ofcours this it affects the static power. and this my goal is to modelise the static power with voltage and temperture instead of leakage current. i had plot a surface that contains static power, temperature and voltage but i don't know if it would be possible to get the equation of this surface.
01-03-2018 06:51 AM
I am sure you can fit an equation to your data. Should not be that hard. It is pretty much increasing with voltage, or temperature, so it is smooth, non-decreasing everywhere. A 2 or three order polynomial should easily fit (temperature causes the highest order increase, and voltage will be closer to a linear fit).
Note that you will need to keep data pairs (v, t) together within less than a second (better with 10 ms) or else you will get self heating effects that will skew your results.
When we characterize the devices, we use temperature forcing systems to set and regulate the junction temperature +/- 0.5 degree.
01-04-2018 02:22 PM
You cannot (directly),
Detailed Power Analysis is done by running the power analyzer tool (report) in Vivado on a completed design.
Before the design is complete, you can estimate using the Xilinx Power Estimator spreadsheet.
Basically, before specifying the bitstream, no power analysis is valid. It is ONLY after you have your target bitstream that you can determine actual power.
Simply the maximum expected static power is in the spreadsheet (also an estimate without a bitstream).