VR2R-0314
① SA Source
- Source: 開啟完整 SA 文章
- Section:
PCB vs Flyover Cables - Line hint:
280
Context Before
Geometry loss describes the insertion loss incurred from abrupt structures of the PCB traces. Real PCB channels include many abrupt structures, such as vias and layer swaps. These are like bumps in a highway, and
Evidence
signals could reflect backward and be interrupted increasing insertion loss.
Context After
Another factor that affects signal performance is cross-talk. Given the increase in the number of I/Os per GPU, lane density in the PCB also increases. Cross-talk describes the scenario where the copper traces are too close to each other and the signal from one lane affects the signal in a neighboring lane. Some copper traces are designed for power as well. When the power lanes are too close to the signal lanes, noise from the power lanes can also modulate the signal as well.
② Atomic Claim
Signals 可能向後反射並受到中斷，進而增加 insertion loss。
- Epistemic Mode:
HYPOTHETICAL - Mapping Status:
PARTIAL
③ Semantic Frame
{
"frame_type": "CLAIM_ONLY",
"qualifiers": {
"condition_text": "continues the vias/layer-change analogy from preceding claims",
"numeric_mentions": [],
"temporal_mentions": []
},
"reason": "EXTRACTION_CONTINUES_GEOMETRY_LOSS_EXPLANATION_WITHOUT_CANONICAL_ENTITY",
"statement": "signals can reflect backward and be interrupted, increasing insertion loss."
}④ Canonical Entity Mapping
| Role | Surface Label | Canonical Target |
|---|---|---|
| — | — | — |
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。