---
type: "Topics"
locale: "en"
url: "https://longbridge.com/en/topics/43171112.md"
description: "We believe the MI455 is the first known chip to ship with active Local Silicon Interconnect (LSI) bridges, the chiplet-to-chiplet links inside a CoWoS-L package.In CoWoS-L's short history, those bridges have always been passive: wiring and capacitors, nothing more. Active LSIs carry real circuitry. At ISSCC 2026, TSMC demoed active bridges with a low-power repeater that regenerates signals mid-channel.Why it matters: once the bridge shares the signal-integrity burden, the PHYs on the top dies can shrink meaningfully at near-zero energy cost, reclaiming leading-edge silicon and shoreline for compute and memory.The giveaway that this is a shipping product rather than a research vehicle: the interposer TSMC showed matches the MI455 exactly. Two base dies, twelve HBM4 stacks, two IO dies."
datetime: "2026-08-04T02:06:47.000Z"
locales:
  - [en](https://longbridge.com/en/topics/43171112.md)
  - [zh-CN](https://longbridge.com/zh-CN/topics/43171112.md)
  - [zh-HK](https://longbridge.com/zh-HK/topics/43171112.md)
author: "[@SemiAnalysis](https://longbridge.com/en/profiles/2078041753485574144.md)"
---

# We believe the MI455 is the first known chip to sh…


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