In semiconductor design, no project escapes the reality of last-minute changes. Whether it’s fixing a functional bug, optimizing timing, or meeting updated design specifications, engineering change orders (ECOs) are inevitable. But implementing ECOs efficiently—without introducing new risks—requires the right expertise and robust signoff methodologies.

          At Avecas, we provide end-to-end ECO Signoff services that ensure late-stage design changes are seamlessly integrated, verified, and ready for tape-out. Our focus is on speed, accuracy, and reliability, enabling you to close your design with confidence while avoiding costly re-spins.

Avecas ECO Signoff Services

Our team at Avecas offers a comprehensive ECO implementation and signoff flow to help you close designs efficiently while minimizing risks.

1. Functional ECO Implementation

• Applying RTL or gate-level patches for last-minute fixes.

• Equivalence checking to ensure functional correctness.

• Optimized cell replacement or insertion for minimal disturbance.

2. Timing ECOs

• Targeted changes to fix setup/hold violations.

• Buffer insertion, cell resizing, or re-routing for closure.

• Iterative STA runs to validate ECO success.

3. Metal-Only ECOs

• Restricting changes to upper metal layers for quick turnaround.

• Reducing cost and time by avoiding full mask re-spin.

• Efficient use of spare cells and routing resources.

4. Verification & Signoff

• Gate-level simulations for functional validation.

• Timing signoff with PrimeTime, Tempus, or equivalent STA tools.

• Power/IR drop and EM re-analysis after ECO changes.

• DRC/LVS checks to guarantee tape-out compliance.