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AR# 30479

10.1 XPower Analyzer (XPA) - Known Issues for XPA


Xilinx Power Analyzer (XPA) is a new GUI utility for design-specific Power Estimation and Analysis. XPA is integrated into the Project Navigator flow of ISE. Xilinx strongly suggests that you adopt the usage of the XPA tool over XPower which is deprecated in 10.1 and will obsolesce in the future. Use the xpa utility in the $Xilinx\bin\nt area to launch the XPA GUI from command line. The batch mode xpwr utility continues to be offered in 10.1.

This Answer Record lists the known issues for version 10.1 of the XPower Analyzer utility.


The following are known issues in 10.1 Xilinx Power Analyzer. These issues are currently being addressed for a future version of this utility.

OS Support and Supported Device Architectures

-- GTP power calculations are incorrect. Please refer to XPE or the data sheet to obtain the correct numbers.

-- I/O and IODELAY power calculations are incomplete for VCCAUX and on versus off chip VCCO power. Please refer to XPE for the compete numbers.

-- Virtex-5 FXT devices are not supported. Support is expected in Service Pack 2.

Utility Issues

-- Power Reduction Tips are general guidelines; they are not design-specific.

-- In the Block Summary view, the cells corresponding to the "Logic" row, and "Used" and "Utilization" columns represent the number of LUTs, and the percentage of LUTs used in your design; this includes SRLs and Distributed RAM Blocks.

-- Assigning the I/O Load (pF) value in the Settings menu does not automatically populate the By Type --> I/Os --> Output Load (pF) column.

Engine-related Issues

-- Net Name Dependency: Any designs that have a double quote character in an object name might not load correctly in the GUI.

-- Maximum process and grade specific quiescent numbers are not supported. Please refer to XPE or the data sheet to obtain the correct numbers.

Reporting/Accuracy-related Issues

-- Displayed power numbers will sometimes appear to not add up. This is because the XPA calculation precision is femtowatts, while the display precision is milliwatts.

AR# 30479
Date 12/15/2012
Status Active
Type General Article