Ultra-Short-Reach Interconnects for Die-to-Die Links: Global Bandwidth Demands in Microcosm
Bibliographic record
Abstract
Bandwidth density metrics are emerging as essential criteria for high performance serial links in addition to energy efficiency. These include bandwidth per bump, per wire, and per millimeter of cross-sectional bus width as well as per-unit chip area. In comparison to conventional board level chip-to-chip interconnects over a PCB, USR interfaces between copackaged dies increase density with relatively modest frequency-dependent losses and, thus, low power consumption. To achieve the highest possible bandwidth density over USR links, traditional assumptions about high performance electrical interconnects such as termination impedances must be reexamined. For example, single ended signaling can offer comparable signal integrity and higher bandwidth density than differential signaling, particularly if there is a pitch constraint on the die-to-die traces. Moreover, termination of the USR links has a significant impact on their performance, so a detailed analysis of the terminating impedances is required to optimize link performance.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.003 | 0.004 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".