Construction Method of Steiner Minimum Tree for Multilayer Barrier in VLSI

Abstract

The invention relates to a multilayer obstacle-avoiding Steiner minimal tree construction method for a very large scale integration. The method includes the following steps: 1, reading benchmark test circuit network data; 2, initializing parameters such as population sizes and iterations, and generating initial populations randomly; 3, updating positions and speeds of particles according to a particle updating formula; 4, calculating fitness values of new particles according to a punishment mechanism based fitness calculation function, judging whether or not the fitness values of the new particles are smaller than historical optimal values of the particles, and if yes, updating the new particles as historical optimal particles of the particles; 5, judging whether or not the fitness values of the new particles are smaller than global optimal values of the populations, and if yes, updating the new particles as global optimal particles of the populations; 6, judging whether iteration end conditions are met or not, if yes, outputting final wiring trees, and if not, returning to the step 3 for next iteration. By the method, total wiring cost is reduced, and quality of the wiring trees is improved.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design of integrated circuits, and in particular relates to a Steiner minimum tree construction method for ultra-large-scale integrated circuits with multi-layer obstacle bypassing under X structure and particle swarm optimization. Background technique [0002] The multilayer obstacle-avoiding X-architecture Steiner minimal tree (ML-OAXSMT) problem in very large scale integration (VLSI) design is a series of wiring pins on a given wiring layer and the obstacle set, the pins on each wiring layer are connected by the X structure edge and the wiring layers are connected by vias, and the Steiner tree with the minimum total wiring cost is constructed under the constraint that the wiring edges and vias do not pass through obstacles . The ML-OAXSMT problem is a Steiner minimum tree model considering three conditions of obstacles, X structure, and multiple layers. [0003] As the basic model of M...

AI Technical Summary

Problems solved by technology

However, this method converts the multi-layer Steiner minimum tree problem into multiple single-layer Steiner minimum tree problems, and fails to find a solution from the global perspective of the multi-layer structure, which greatly affects the quality of the wiring solution.

Images