Extending systems-on-chip to the third dimension: performance, cost and technological tradeoffs
Proceedings of the 2007 IEEE/ACM international conference on Computer-aided design
LP based white space redistribution for thermal via planning and performance optimization in 3D ICs
Proceedings of the 2008 Asia and South Pacific Design Automation Conference
Integrated interlayer via planning and pin assignment for 3D ICs
Proceedings of the 11th international workshop on System level interconnect prediction
IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
SOC'09 Proceedings of the 11th international conference on System-on-chip
Integration, the VLSI Journal
Rethinking thermal via planning with timing-power-temperature dependence for 3D ICs
Proceedings of the 16th Asia and South Pacific Design Automation Conference
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In this paper, we investigate thermal via (T-via) planning during three-dimensional (3-D) floorplanning. First, we consider the temperature constrained T-via planning (TVP) problem on a given 3-D floorplan. Second, we integrate dynamic TVP into 3-D floorplanning process. Our main contribution and results can be summarized as follows. We solve the temperature constrained TVP problem by solving a sequence of simplified interlayer and intralayer TVP subproblems. Each subproblem is formulated as convex programming problem and we derive nearly optimal solution for detailed T-via distribution. Based on the TVP solution, we implement the integrated TVP and 3-D floorplanning algorithm in a two-stage approach. Before floorplanning, blocks are assigned into different layers by solving a sequence of knapsack problems. During floorplanning, T-vias are allocated with white space redistribution to optimize T-via insertion. Experimental results show that our TVP approach can reduce T-vias by 12% compared with a recent published work (J. Cong and Y. Zhang, "Thermal via planning for 3-D ICs," in Proc. Int. Conf. Comput.-Aided Des., Nov. 2005, pp.745-752). Compared with the postfloorplanning optimization approach, integrating TVP into floorplanning process can reduce T-vias by 16% with 21% runtime overhead