Construction of DelayDriven GNR Routing Tree It is known that graphene nanoribbon (GNR) based devices and interconnects can be treated to be better alternative in nanoscale designs. In this paper, given a source pin and a set of target pins inside a GNR gridbased routing plane, based on the consideration of the wirelength and bending delay in graphene nanoribbon, an efficient routing algorithm can be proposed to construct a delaydriven GNR routing tree with minimizing the total wirelength for the target pins. Compared with Dasu0027s algorithm 9 on total wirelength and maximum sourcetotarget delay, the experimental results show that our proposed routing algorithm only uses 8.05% of the extra wirelength to reduce 23.13% of the maximum delay in the construction of a delaydriven GNR routing tree for 6 tested examples on the average.

An Effective Detailed Routing Algorithm Considering Advanced VLSI Technologies Detailed routing has become more challenging in modern circuit designs due to the extreme scaling of chip size and the additional complicated design rules. In this paper, we present an effective detailed routing algorithm for advanced technology nodes with the aim to optimize the total routing wirelength. Under the constraints of blockages and pin information, we first present a shapebased connection candidates generation to generate crucial connection points, which significantly reduces searching connection points for the following detailed routing process. Then, a valid netu0027s connection edges selection strategy is presented to choose routing direction edges, and a fast scanning line technique is applied to remove invalidate edges. Finally, considering the complex design rules in the advanced technology nodes, we introduce a Steiner minimal tree based algorithm to obtain an initial detailed routing result, and further propose a complexitydriven postprocessing and refinement stage to strike out redundant points and merge adjacent edges. Experimental results on industry benchmarks show that, comparing with classical algorithms, our proposed algorithm not only achieves 100% routability on real industrial cases but also obtains shorter total wirelength.