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Abstract-In this paper, we present the complete design and architectural details of MAIZEROUTER. MAIZEROUTER reflects a significant leap in progress over existing publicly available routing tools yet relies upon relatively simple operations, including extreme edge shifting, a technique aimed primarily at the efficient reduction of routing congestion, and edge retraction, a counterpart to extreme edge shifting that serves to reduce unnecessary wirelength. We present enhanced variations of these operations to enable the rapid exploration of candidate paths, along with a form of dynamic cost deflation that provides our various path computation procedures with progressively more accurate (and less optimistic) cost information as search continues. These algorithmic contributions are built upon a framework of interdependent net decomposition, a representation that improves upon traditional two-pin net decomposition by preventing duplication of routing resources while enabling cheap and incremental topological reconstruction. Collectively, these operations permit a broad search space that previous algorithms have been unable to achieve, resulting in solutions of considerably higher quality than those of well-established routers.

Despite remarkable progress in the area of global routing, the burdens imposed by modern physical synthesis flows are far greater than those expected or anticipated by available (academic) routing engines. As interconnects dominate the path delay, physical synthesis such as buffer insertion and gate sizing has to integrate with layer assignment. Layer directives -commonly generated during wire synthesis to meet tight frequency targets -play a critical role in reducing interconnect delay of smaller technology nodes. Unfortunately, they are not presently understood or honored by leading global routers, nor do existing techniques trivially extend toward their resolution. The shortcomings contribute to a dangerous blindspot in optimization and timing closure, leading to unroutable and/or underperforming designs. In this paper, we aim to resolve the layer compliance problem in routing congestion evaluation and global routing, which is very critical for timing closure with physical synthesis. We propose a method of progressive projection to account for wire tags and layer directives, in which classes of nets are successively applied and locked while performing partial aggregation. The method effectively models the resource contention of layer constraints by faithfully accumulating capacity of bounded layer ranges, enabling three-dimensional assignment to subsequently achieve complete directive compliance. The approach is general, and can piggyback on existing interfaces used to communicate with popular academic engines. Empirical results on the IC-CAD 2009 benchmarks demonstrate that our approach successfully routes many designs that are otherwise unroutable with existing techniques and naïve approaches.

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Meghan Burke defines colorism as “the allocation of privilege and disadvantage according to the lightness or darkness of one’s skin” (International Encyclopedia of the Social Social Sciences, 2nd ed.). The intraracial practice can be heightened in familial interactions. This collaborative autoethnography utilizes Alice Walker’s framework of womanism to explore the narratives of colorism in a mother–daughter relationship when the two do not share the same skin hue. Womanism instructs us to break our silence around practices that denigrate us and seek ways to survive and thrive in our blackness. Four specific incidents experienced by my adolescent daughter are shared to critique colorism and consider strategies for navigating this practice and sustaining a mother–daughter relationship.