Detailed routing architectures for embedded programmable logic IP cores
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Bibliographic record
Abstract
As the complexity of integrated circuits increases, the ability to make post-fabrication changes to fixed ASIC chips will become more and more attractive. This ability can be realized using programmable logic cores. These cores are blocks of programmable logic that can be embedded into a fixed-function ASIC or a custom chip. Such cores differ from stand-alone FPGAs in that they can take on a variety of shapes and sizes. With this in mind, we investigate the detailed routing characteristics of rectangular programmable logic cores. We quantify the effects of having different x and y channel capacities, and show that the optimum ratio between the x and y channel widths for a rectangular core is between 1.2 and 1.5. We also present a new switch block family optimized for rectangular cores. Compared to a simple extension of an existing switch block, our new architecture leads to an 8.7% improvement in density with little effect on speed. Finally, we show that if the channel widths and switch block are chosen carefully the penalty for using a rectangular core (compared to a square core with the same logic capacity) is small; for a core with an aspect ratio of 2:1, the area penalty is 1.6% and the speed penalty is 1.1%.
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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