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Voltus Rail Analysis Fail: No Current Source

TONG995

I wanted to do an IR drop analysis and followed the procedure provided in the Cadence tutorial video: power analysis, specify power net, power pad location file, run rail analysis.

It did not run successfully with the following error:

" ** ERROR: (VOLTUS_RAIL_SMG-0047): Net VDD doesn't have any valid current source (tap) connected, therefore analysis cannot continue. If this is intended to be an incomplete net, please add 'set_rail_analysis_mode -ignore_incomplete_net true' and rerun.
*** Error: Failed to run voltus_rail_smg, return code is 1
*** Error: In processing command script
Power grid merging failed."

The power pad location file looks like this:

" *vsrc_name x y layer_name
  VDDvsrc1 52.665 883.880 G2
  VDDvsrc2 52.665 468.880 G2
  VDDvsrc3 52.665 553.880 G2
  VDDvsrc4 52.665 638.880 G2

..."

Can you provide some advice on how to resolve this ?

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