SA260324R-0167_r1

SA260324R-0167

① SA Source

• Source: 開啟完整 SA 文章
• Section: Intra-Tray Topology
• Line hint: 203

Context Before

Within each tray or node, all 16 LPUs are connected to each other in an all-to-all mesh. Each LPU module connects to the 15 other LPUs within the node with 4x100G of C2C bandwidth. Note that this ‘C2C’ is not related to NVLink, but Groq’s own scaleup fabric.

Evidence

These connections are all via PCB trace, which necessitates an extremely high spec PCB to support this routing density.

Context After

This is why the belly-to-belly layout is used: it reduces the ‘X’ and ‘Y’ distance between all the LPUs and instead have routing go in the ‘Z’ dimension.

② Atomic Claim

這些連線全部走 PCB trace，因此需要極高規格的 PCB 才能支撐這種 routing density。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "attribute": "ROUTING_DENSITY_REQUIREMENT",
  "context_nodes": [],
  "entity": {
    "id": "04_knowledge_base/PCB",
    "label": "PCB"
  },
  "frame_type": "ATTRIBUTE",
  "qualifiers": {
    "condition_text": null,
    "numeric_mentions": [],
    "temporal_mentions": []
  },
  "value": {
    "numeric_mentions": [],
    "value_text": "所有連線皆透過 PCB trace，需極高規格 PCB 才能支撐 routing density。"
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
entity	PCB	PCB

⑤ Human Review

請在 Properties 逐項確認：

• 原文 → Atomic Claim 是否忠實
• Atomic Claim → Semantic Frame 是否忠實
• Canonical Entity mapping 是否正確
• Epistemic mode 是否保留原文語氣
• 最後選擇 review_action

Review state

Markdown 內文不是正式 approval。只有 Apply bridge 寫入的 Decision Ledger event 才是正式決策。