Mixing buffers and pass transistors in FPGA routing architectures
Why this work is in the frame
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Bibliographic record
Abstract
The routing architecture of an FPGA consists of the length of the wires, the type of switch used to connect wires (buffered, unbuffered, fast or slow) and the topology of the interconnection of the switches and wires. FPGA routing architecture has a major influence on the logic density and speed of FPGA devices. Previ?ous work [] based on a 0.35um CMOS process has suggested that an architecture consisting of length 4 wires (where the length of a wire is measured in terms of the number of logic blocks it passes before being switched) and half of the programmable switches are active buffers, and half are pass transistors. In that work, however, the topology of the routing architecture prevented buffered tracks from connecting to pass-transistor tracks. This restriction prevents the creation of interconnection trees for high fanout nets that have a mixture of buffers and pass transistors. Electrical simulations sug?gest that connections closer to the leaves on interconnection trees are faster using pass transistors, but it is essential to buffer closer to the source. This latter effect is well known in regular ASIC routing [2].
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 it