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Issue with Time-Based Power Analysis in Joules (Single Frame Only)

DS202606023124
DS202606023124 1 day ago

Hi all,

I'm using Joules for power analysis on a Genus-synthesized netlist and trying to perform time-based analysis from a VCD file. However, despite loading the stimulus with read_stimulus -frame_count 10, only a single frame (stim#1/frame#1) is created. When I run compute_power -mode time_based, Joules reports that the stimulus contains only one frame and automatically falls back to average analysis.

My flow is:

  • Load technology files
  • Read HDL and elaborate design
  • Apply SDC constraints
  • Write elab.db

For power analysis:

  • rtlstim2gate -init $ELAB_JDB -keep_libraries
  • read_netlist
  • read_sdc
  • read_stimulus -frame_count 10 -file dump.vcd
  • compute_power -mode time_based

I expected 10 separate frames to be generated from the VCD, but only one frame appears. Has anyone encountered this issue or knows if additional settings are required to preserve multiple stimulus frames for time-based power analysis?

Any help would be greatly appreciated.

Thanks,
Dario

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