VR-COV-VR-PCBSUP-NVSwitch-WUS
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB Materials Upgrade and Area Growth - Line hint:
455
Context Before
On the material side, CCL content upgrades from M7 to M8/M9 drives material upgrades. Copper foil is upgraded to HVLP4 across the board for the main compute and networking boards. A glass fiber cloth upgrade is necessary to reduce dielectric loss, but whether quartz cloth (Q glass) is necessary remains a debate. Below let’s discuss the materials upgrade and the key considerations behind the adoption of each material.
The Table below shows the CCL classification and PCB specification of each main board in Blackwell versus Rubin.
Evidence
Context After
Source: Nvidia VR NVL72 Component BoM and Power Budget Model ↗
The classification of CCL materials is determined by its dielectric constant (Dk) and dissipation factor (Df) at a given frequency. Insertion loss is lower at lower Dk and Df value. The common classification is anchored to the Megtron series from Panasonic as they have been setting the industry standard. When people describe the CCL as M7 classification it usually means it matches the same Dk and Df specifications as Megtron 7 of Panasonic.
② Atomic Claim
The February table lists WUS as a VR NVL72 NVSwitch PCB supplier.
- Epistemic Mode:
ATTRIBUTED - Mapping Status:
COMPLETE
③ Semantic Frame
{
"attribute": "VR_NVL72_NVSWITCH_PCB_SUPPLIER",
"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": "WUS"
}
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| entity | PCB | PCB |
⑤ V2 Draft（需要修正時直接編輯）
Inline repair
只編輯以下三個 Draft 區塊。完成後將
review_action設為REQUEST_REPAIR，再手動執行 Repair Preview。
執行腳本前，Draft 不會寫入 Claim Store 或 Graph。
V2 Atomic Claim Draft
The February table lists WUS as a VR NVL72 NVSwitch PCB supplier.
V2 Semantic Frame Draft
{
"attribute": "VR_NVL72_NVSWITCH_PCB_SUPPLIER",
"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": "WUS"
}
}V2 Revision Metadata Draft
{
"epistemic_mode": "ATTRIBUTED",
"mapping_status": "COMPLETE"
}⑥ 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。