Quartus® Prime Pro Edition User Guide: Power Analysis and Optimization

ID 683174
Date 4/01/2024
Document Table of Contents Specifying Start and End Time for Signal Activity Calculations

To specify a start and end time for signal activity calculations using the Limit VCD period option, follow these steps:

  1. In the Quartus® Prime software, click Assignments > Settings.
  2. Under the Category list, click Power Analyzer Settings.
  3. Turn on the Use input file(s) to initialize toggle rates and static probabilities during power analysis option.
  4. Click Add.
  5. In the File name and Entity fields, browse to the necessary files.
  6. Under Simulation period, turn on VCD file and Limit VCD period options.
  7. In the Start time and End time fields, specify the desired start and end time.
  8. Click OK.

You can also use the following Tcl or .qsf assignment to specify .vcd files:

set_global_assignment -name POWER_INPUT_FILE_NAME "test.vcd" -section_id test.vcd
set_global_assignment -name POWER_VCD_FILE_START_TIME "10 ns" -section_id test.vcd
set_global_assignment -name POWER_VCD_FILE_END_TIME "1000 ns" -section_id test.vcd
set_instance_assignment -name POWER_READ_INPUT_FILE test.vcd -to test_design