Rectangular steiner tree method of super large size integrated circuit avoiding barrier

Abstract

The obstacle avoiding rectangular Steiner tree method for very large scale integrated circuit (VLSI) design belongs to the field of computer-aided VLSI design technology, and is especially VLSI wiring design. The present invention features the first application of full Steiner tree (FST) end point separating method, subsequent construction of son Steiner tree by means of ant swarm method and voracious FST method for different son sets, and final connection of all the son Steiner trees in detour method. The said algorithm can process multiple end point wire mesh; can process complex obstacles and can process large scale issue in relatively short time. The present invention realizes obstacle avoiding rectangular Steiner tree constructing method with optimized wire length and time efficiency in VLSI wiring design.

Description

technical field [0001] Integrated circuit computer-aided design is the technical field of IC CAD, especially the field of VLSI wiring design. Background technique [0002] In integrated circuit (IC) design, physical design is one of the main steps, but also the most time-consuming step. A computer-aided design technique related to physical design is called layout design. In layout design, wiring is an extremely important link. [0003] The design scale of integrated circuits is currently developing from very large scale (VLSI), very large scale (ULSI) to G scale (GSI), and the design concept of system-on-chip (SOC) has emerged. The research on the construction method of the minimum rectangular Steiner tree (rectilinear Steinerminimal tree, RSMT) is an important issue in the VLSI / ULSI / GSI / SOC layout design, especially in the wiring research. In the actual wiring process, because the macro module, IP module and pre-wiring will all become obstacles, the RSMT method consideri...

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Problems solved by technology

However, there are still shortcomings in this method: the shape of obstacles is limited to convex polygons, and the method of circumventing obstacles depends on the construction results of the initial Steiner tree, which is not suitable for large-scale line networks.

[0017] In addition, the literature [Huang Lin, Zhao Wenqing, Tang Pushan. A construction method of Steiner tree with floating endpoints. Journal of Computer-Aided Design and Graphics. Vol.10, No.6, 1998.11.] in the specific analysis and method description , no description for disabled conditions

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