Is K-factor or other power consumption data available for Spartan-II devices?
There are currently no plans to publish a K-factor for Spartan-II. As an alternative, the Virtex Power Estimator will provide a reliable estimation of power consumption in Spartan-II devices. As with Virtex, the reliability of the estimation is dependent upon the accuracy of the information entered about the design (e.g., clock frequency, toggle rate).
Another alternative is XPower, which is a graphical power estimation tool that supports Spartan-II designs.
To access both the Virtex Power Estimator and XPower, go to:
Virtex Power Estimator: Products -> Devices -> Virtex Series -> Power (under "Related Features" on the right side)
XPower: Products -> Design Tools -> Verification Technologies -> XPower
Below are direct links:
Virtex Power Estimator: