SA260324R-0147
① SA Source
- Source: 開啟完整 SA 文章
- Section:
LPX Compute Tray - Line hint:
185
Context Before
The LPU modules are mounted in a belly-to-belly on the PCB, meaning 8 LP30 modules on the top side of the PCB and the other 8 LP30 modules on the bottom. All of the connectivity that comes out of the LPU are via PCB traces and given the dense all-to-all mesh for intra-node connections this requires a very high spec PCB to support the routing. The belly-to-belly mounting is used to reduce PCB trace lengths across the ‘X’ and ‘Y’ dimensions.
Evidence
Something interesting about the system is the important role the FPGAs play.
Context After
Nvidia refers to the FPGAs as “Fabric Expansion Logic” which serves multiple purposes. First, they act as a NIC which converts the LPU’s C2C protocol into Ethernet to connect to the Spectrum-X based ethernet scale-out fabric. It is this scale-out fabric through which the LPUs connect to GPUs in the decode system.
② Atomic Claim
這套系統一個值得注意的地方，是 FPGA 扮演非常重要的角色。
- Epistemic Mode:
ASSERTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"attribute": "SYSTEM_ROLE_IMPORTANCE",
"context_nodes": [],
"entity": {
"id": "04_knowledge_base/FPGA",
"label": "FPGA"
},
"frame_type": "ATTRIBUTE",
"qualifiers": {
"condition_text": null,
"numeric_mentions": [],
"temporal_mentions": []
},
"value": {
"numeric_mentions": [],
"value_text": "在此系統中扮演非常重要的角色。"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | FPGA | FPGA |
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。