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AR# 36252

14.x XPower Analyzer(XPA) - "WARNING:POWER:1369/1338 - Clock frequency for one or more clocks was not found through timing constraints (PCF file) or simulation data"

Description

When running XPA, I got the following error messages:

WARNING:POWER:1338 - Clock frequency for one or more clocks was not found through timing constraints (PCF file) or simulation data. Without knowing the clock frequency of all clocks, dynamic power information for those clock domains will default to zero which may under-estimate the power for this design.To avoid this warning, provide at least one of the following:

1. The proper timing constraints (PERIOD) for clocks (re-implement design and load the newly generated PCF file into XPower Analyzer)
2. A post PAR simulation-generated VCD or SAIF file indicating clock frequencies
3. The clock frequency for clocks in the "Clocks By Type" view in the XPower Analyzer GUI and then applying "Estimate Activity Rates"

WARNING:POWER:1369 - Clock frequency for one or more clocks was not found through timing constraints (PCF file) or simulation data.Without knowing the clock frequency of all clocks, dynamic power information for those clock domains will default to zero which may under-estimate the power for this design. To avoid this warning, provide at least one of the following:

1. The proper timing constraints (PERIOD) for clocks (re-implement design and load the newly generated PCF file into XPower Analyzer)
2. A post PAR simulation-generated VCD or SAIF file indicating clock frequencies
3. The clock frequency for clocks in the "By Type -> Clocks" view in the XPower Analyzer GUI and then applying "Update Power Analysis"

What should I do to address the warnings?

Solution

As the warning message described, XPower Analyzer cannot pull out the necessary clock frequency information from the simulation file (VCD or SAIF) or the constraint file (PCF). In this case, the affected clock domains will be power under-estimated with a zero clock frequency.

To avoid under-estimation, at least one of the suggested work arounds should be used.
AR# 36252
Date Created 04/30/2012
Last Updated 05/16/2012
Status Active
Type Error Message
Tools
  • ISE Design Suite - 12.2
  • ISE Design Suite - 12.3
  • ISE Design Suite - 12.4
  • More
  • ISE Design Suite - 13
  • ISE Design Suite - 13.1
  • ISE Design Suite - 13.2
  • ISE Design Suite - 13.3
  • ISE Design Suite - 12.1
  • ISE Design Suite - 13.4
  • ISE Design Suite - 14.1
  • Less