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Join us on Wednesday June 17, 2026 for a live “Ask Me Anything” Dedicated Expert Session: Constraint Manager

Renu Vibha

Got Questions on Constraint Manager?

Want clarity on new features and solving everyday design challenges?

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June 17, 2026 | 7:30–8:30 PM IST

Topics:

  • Electrical Constraints
  • Physical & Spacing Constraints

 

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Parents
  • CF202606104231
    0

    How would you debug a scenario where a net shows incorrect propagation delay despite correct ECSet assignment? 

Reply
  • CF202606104231
    0

    How would you debug a scenario where a net shows incorrect propagation delay despite correct ECSet assignment? 

Children
  • Vipulc
    0 in reply to CF202606104231
    • Check cross-section accuracy (dielectric, thickness)
    • Verify Analysis Modes enabled
    • Confirm correct pin-pair or Xnet definition
    • Validate Manhattan vs routed length usage
  • KS202606109251
    0 in reply to CF202606104231

    I am also experiencing a clearance issue where my custom spacing constraints set (cset) is being ignored. Allegro 17.4 is applying a different clearance rule, but I can’t locate where the override is happening . In 17.4 constraint manager interface how can o audit a specific net to see the exact hierarchy of applied rules (global vs class vs region) and find out what is overriding my cset?

  • Vipulc
    0 in reply to KS202606109251

    Use Show Constraints (Display > Constraints) or right‑click on the net to view the resolved rule and identify which hierarchy level is overriding the CSet.

    Check within Constraint Manager (right‑click > Show Constraints or Tools > Constraint Audit) to analyze conflicts and review detailed reports.

    Remember the hierarchy (Region > Net Class > Net > Global); if the net passes through a region, its rules will override the assigned CSet.

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