https://bitwiz.io/tags/metastability/Recent content in Metastability on bitwizHugoen-usFri, 02 Jan 2026 05:19:00 +0000https://bitwiz.io/articles/cdc-two-flip-flops-are-not-magic/Fri, 02 Jan 2026 05:19:00 +0000https://bitwiz.io/articles/cdc-two-flip-flops-are-not-magic/<p><em>Timing Series: Part 5 of 6</em></p> <p><em>Previous: <a href="https://bitwiz.io/articles/silicon-real-estate-your-resource-budget/">Silicon Real Estate: Your Resource Budget</a></em></p> <hr> <h2 id="the-bug-you-cant-reproduce">The Bug You Can&rsquo;t Reproduce</h2> <p>You&rsquo;re debugging a data corruption bug. It happens once every few hours under heavy load. Sometimes once a day. The data path looks fine. The control logic looks fine. You add ILA triggers. You wait. You catch it.</p> <p>A control signal that pulses for one cycle is sometimes missed entirely. The path crosses clock domains. You have a 2-flop synchronizer.</p>