LithoHoD: A Litho Simulator-Powered Framework for IC Layout Hotspot Detection
This addresses the urgent demand for advanced hotspot detection in VLSI fabrication due to die shrinkage and increased layout density, though it appears incremental as it builds on existing object detection and simulation methods.
The paper tackles the problem of poor generalization in learning-based IC layout hotspot detectors by proposing a framework that integrates a lithography simulator with an object detection backbone, achieving state-of-the-art performance on real-world data.
Recent advances in VLSI fabrication technology have led to die shrinkage and increased layout density, creating an urgent demand for advanced hotspot detection techniques. However, by taking an object detection network as the backbone, recent learning-based hotspot detectors learn to recognize only the problematic layout patterns in the training data. This fact makes these hotspot detectors difficult to generalize to real-world scenarios. We propose a novel lithography simulator-powered hotspot detection framework to overcome this difficulty. Our framework integrates a lithography simulator with an object detection backbone, merging the extracted latent features from both the simulator and the object detector via well-designed cross-attention blocks. Consequently, the proposed framework can be used to detect potential hotspot regions based on I) the variation of possible circuit shape deformation estimated by the lithography simulator, and ii) the problematic layout patterns already known. To this end, we utilize RetinaNet with a feature pyramid network as the object detection backbone and leverage LithoNet as the lithography simulator. Extensive experiments demonstrate that our proposed simulator-guided hotspot detection framework outperforms previous state-of-the-art methods on real-world data.