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AR# 37808

12.2 XPA - Why does power consumption on my board disagree with power estimates?

Description


When I use XPA to estimate the power consumption of the design in my device, I see real world consumption of approximately 2x the estimate.
Why is this the case?

Solution

Real world power consumption is not only dependent upon the nature of the design and target device, but also the manufacturing process of the target device.

Variations from chip-to-chip exist and some devices in the same family (with the same design loaded) consume more (or less) power than others. These variations can be thought of as a bell curve with a standard deviation from the mean.

XPA accommodates these variations by using the "Process" setting. The Process setting has two possible values: Typical and Maximum. For best real world estimates, it is recommended to take a conservative approach and always use the Maximum setting for Process as this takes the worst-case process deviation data into account.

In real world scenarios, some devices (but not all) align closely to the values shown under the Typical setting, but none should ever go beyond those listed in the Maximum setting (assuming that all other operating parameters are met).
AR# 37808
Date Created 09/01/2010
Last Updated 12/15/2012
Status Active
Type General Article
Tools
  • ISE - 10.1
  • ISE Design Suite - 11.1
  • ISE Design Suite - 11.2
  • More
  • ISE Design Suite - 11.3
  • ISE Design Suite - 11.4
  • ISE Design Suite - 11.5
  • ISE Design Suite - 12.1
  • ISE Design Suite - 12.2
  • ISE Design Suite - 12.3
  • ISE Design Suite - 13.1
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