Huawei’s semiconductor arm, HiSilicon, has signaled a decisive shift in its strategy to overcome global lithography constraints. Teresa He, the veteran head of Huawei’s chip design division, has released the second iteration of her 'Tao Law' (韬定律) paper on ChinaXiv. This updated version moves beyond theoretical frameworks to provide concrete engineering blueprints for the next generation of domestic silicon, specifically targeting the 'post-Moore’s Law' era where physical scaling of transistors has hit a wall.
The core of the 'Tao Law' revolves around a scaling theory based on the time constant (τ), rather than just physical dimensions. Version 2 of the paper introduces 'LogicFolding,' a revolutionary technique that employs a specific 'gear ratio' to optimize chip design. By aligning hybrid bonding pitches with top-layer metal wiring, Huawei claims it can move from traditional discrete macro-block optimization to continuous unit-level optimization in a three-dimensional space.
Perhaps the most significant revelation in the update is the inclusion of empirical performance data for the upcoming Kirin 2026 processor. By comparing it to the benchmark Kirin 9030 Pro, Huawei has detailed specific improvements in voltage, frequency, and power density. This indicates that the theoretical vertical logic partitioning is no longer just a laboratory concept but a verified architecture ready for mass production, allowing for superior power efficiency and area utilization without relying solely on shrinking transistor nodes.
This architectural pivot represents Huawei’s strategic response to being denied access to the most advanced extreme ultraviolet (EUV) lithography tools. By mastering 3D stacking and vertical logic integration, the company is attempting to manufacture chips that perform at 'leading-edge' levels while using slightly older, more accessible fabrication processes. If successful, this 'LogicFolding' approach could allow China’s semiconductor industry to remain competitive in the high-performance computing and smartphone markets despite ongoing trade restrictions.