SA260324R-0028_r1

SA260324R-0028

① SA Source

• Source: 開啟完整 SA 文章
• Section: LPU chip
• Line hint: 41

Context Before

Groq’s first and only publicly announced LPU architecture was detailed in their ISCA 2020 paper. Unlike typical hardware architectures connecting many general-purpose cores, Groq re-organized the architecture into groups of single-purpose units connecting to other groups of different purposes, and they named the groups “slices.” Between functional units are streaming registers, scratchpad SRAM for functional units to pass data to each other.

Evidence

Groq opted for single-level scratchpad SRAM instead of multi-level memory hierarchy to make the hardware execution deterministic.

Context After

Concretely, LPU architecture has VXM slices for vector operations, MEM slices for loading/storing data, SXM slices for tensor shape manipulation, and MXM slices for performing matrix multiplication. Spatially, the slices are laid out horizontally, allowing the data to stream horizontally. Within a slice, instructions are pumped vertically across units. Conceptually, LPU resembles a systolic array that pumps instructions vertically and data horizontally.

② Atomic Claim

Groq 選擇單層 scratchpad SRAM，而不是多層記憶體階層，以讓硬體執行具備 deterministic 特性。

• Epistemic Mode: ASSERTED
• Mapping Status: COMPLETE

③ Semantic Frame

{
  "additional_nodes": [
    {
      "id": "04_knowledge_base/Groq LPU",
      "label": "LPU"
    }
  ],
  "frame_type": "RELATION",
  "object": {
    "id": "04_knowledge_base/SRAM",
    "label": "scratchpad SRAM"
  },
  "predicate": "CHOSE_SINGLE_LEVEL_SCRATCHPAD",
  "qualifiers": {
    "condition_text": "instead of multi-level memory hierarchy；目的為使硬體執行 deterministic",
    "numeric_mentions": [],
    "temporal_mentions": []
  },
  "subject": {
    "id": "02_companies/Groq",
    "label": "Groq"
  }
}

④ Canonical Entity Mapping

Role	Surface Label	Canonical Target
subject	Groq	Groq
object	scratchpad SRAM	SRAM
additional_node	LPU	04_knowledge_base/Groq LPU

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。