How to estimate PEAK power consumption on Xilinx FPGA ?

[eulia]

Hi,

Is there anyway to estimate "PEAK power consumption" using an Xilinx XPowe
analyzer ?

I think the "Summar" page shows AVERAGE power consumption.

Thanks,

Jeong-Gun



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[glen herrmannsfeldt]

eulia <3676@embeddedrelated> wrote:

Hi,

Is there anyway to estimate "PEAK power consumption" using an Xilinx XPower
analyzer ?

I think the "Summar" page shows AVERAGE power consumption.

What do you mean by peak?

You have to have some capacitors on the supply lines, which
will average out any transients.

For CMOS, other than quiescient power (leakage current) power
occurs when a gate changes state, and for a very short time.

As you can't predict accurately enough the transition time, you
can't predict how many will transition in a given femtosecond.

Now, you might want the average over a somewhat shorter time scale,
especially as you might want to know how to divide up the required
capacitance, but peak really doesn't have much meaning.

-- glen