Run Eco

• CRITICAL: NEVER re-run the full FC flow during ECO. Only use flows/run_eco.tcl.
• Backup .dlib before ECO:

  TIMESTAMP=$(date +%Y%m%d_%H%M%S)
  cp -a $PROJECT_PATH/fc/${DESIGN_NAME}.dlib $PROJECT_PATH/fc/backup_eco_${TIMESTAMP}.dlib
  

• Backup existing FC outputs:

  cp -a $PROJECT_PATH/fc/output $PROJECT_PATH/fc/output_backup_${TIMESTAMP}
  

• NEVER delete any reports.

Execution

cd $PROJECT_PATH/fc && mkdir -p scripts report output temp
cd $PROJECT_PATH/fc/temp && fc_shell -f ../scripts/flows/run_eco.tcl 2>&1 | tee ../report/run_eco.log

ECO typically takes 1-5 minutes. Use run_in_background: true if needed, or the nohup pattern:

cd $PROJECT_PATH/fc/temp && nohup fc_shell -f ../scripts/flows/run_eco.tcl > ../report/run_eco.log 2>&1 &
echo $! > /tmp/.fc_eco_pid

Post-ECO Checks

The ECO flow (stages/eco.tcl) produces the same reports as the DFM + output stages. Check:

1. DRC: Parse fc/report/dfm_drc.rpt

   • TOTAL VIOLATIONS = must be 0
   • Total number of open nets = must be 0
   • Total number of antenna violations = must be 0

2. LVS: Parse fc/report/dfm_lvs.rpt

   • Total number of short violations is must be 0
   • Total number of open nets is must be 0
   • Total number of floating route violations is must be 0

3. Timing (setup): Parse fc/report/final_timing.rpt

   • Look for slack (MET) -- must not be (VIOLATED)

4. Timing (hold): Parse fc/report/final_timing_hold.rpt

   • Look for slack (MET) -- must not be (VIOLATED)

5. Power: Parse fc/report/final_power.rpt

6. QoR: Parse fc/report/final_qor.rpt

   • No. of Violating Paths: must be 0

7. Verify new outputs:

   ls -la $PROJECT_PATH/fc/output/${DESIGN_NAME}_pt.v \
          $PROJECT_PATH/fc/output/${DESIGN_NAME}_lvs.v \
          $PROJECT_PATH/fc/output/${DESIGN_NAME}.sdc \
          $PROJECT_PATH/fc/output/${DESIGN_NAME}.gds \
          $PROJECT_PATH/fc/output/${DESIGN_NAME}.def
   

Report Format

Same as /check-reports eco.

Safety Rules

• NEVER use flows/run_full.tcl or create_lib during ECO.
• NEVER modify RTL.
• NEVER delete reports -- ECO log uses run_eco.log (append iteration number if tracking).