relatório técnico

Recovering layout margin in advanced nodes

Reducing voltage-aware DRC pessimism through automated synchronous net identification

A screenshot of layout DRC checks for a chargePump cell. The estimated delta-V is 2.8V, resulting in a red spacing violation marker. A "SYNC flagged" scenario shows a more accurate delta-V of 0.6V, resulting in a green "relaxed constraint" marker.

In advanced process nodes, physical verification teams face the challenge of balancing reliability with area efficiency. While voltage-aware design rule checking (VA-DRC) addresses this, traditional implementations often use conservative worst-case voltage assumptions, leading to unnecessary spacing, restricted routing and wasted silicon area. The SyncNets packaged check for Calibre PERC provides a strategic optimization by integrating timing-related design intent into physical verification. By identifying synchronously switching net pairs, SyncNets replaces generic delta-V assumptions with realistic, synchronized voltage differentials. This approach significantly recovers layout margin and enhances design density, accelerating time-to-market while maintaining reliability compliance.

What you'll learn:

  • How conservative voltage assumptions lead to wasted silicon area and reduced routing flexibility.
  • The concept of synchronous net identification and its impact on delta-V calculations.
  • How the SyncNets Calibre PERC packaged check automates the integration of timing intent into physical verification.
  • The benefits of recovering layout margins and improving design density without sacrificing reliability.
  • The implementation details of the SyncNets flow, from capturing designer intent to automated verification.

Who should read this:

  • Physical verification engineers
  • Layout engineers
  • CAD engineers
  • Design managers
  • Reliability engineers working on advanced process nodes

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