Tape-out Release Engineering & Signoff Gates

Overview

Why this topic

A tape-out is a release that costs millions of dollars in masks and months of fab time, and it cannot be patched. If the database sent to the foundry has one unfixed DRC violation, the wrong version of a memory macro or a timing path nobody signed off, the result may be dead silicon and a respin.

Release engineering for a chip is the discipline that prevents that: milestone freezes that control what may change and when, signoff checklists where every item is either clean or carries an approved waiver, every late change (ECO) tracked and re-verified, and a final database whose every input is versioned so it can be reproduced and audited years later. A DevOps engineer on a silicon team usually owns the systems behind it: the design data repository, the signoff dashboard, the release scripts and the handoff.

Interview questions

• Walk me through the milestone gates from RTL freeze to tape-out. What does each one check, and who can change what after it?
• How do you build and run a signoff dashboard so that nobody tapes out with an unchecked item?
• How do you track ECOs between netlist freeze and tape-out so that none of them escape verification?
• What exactly is handed to the foundry at tape-out, and how do you make the handoff safe?
• How do you manage design data and third-party IP so the release names exactly what is inside the chip?
• Two years after tape-out a customer reports a failure. How do you make sure you can reproduce the exact tape-out database and show an audit trail of how it was signed off?

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