Module packing based on the BSG-structure and IC layout applications

  • Authors:
  • S. Nakatake;K. Fujiyoshi;H. Murata;Y. Kajitani

  • Affiliations:
  • Dept. of Electr. & Electron. Eng., Tokyo Inst. of Technol.;-;-;-

  • Venue:
  • IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems
  • Year:
  • 2006

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Abstract

A new method of packing the rectangles is proposed with applications to integrated circuit (IC) layout design. A special work-sheet, called the bounded-sliceline grid, is introduced. It consists of special segments that dissect the plane into rooms to which binary relations “right-of” and “above” are associated such that any two rooms are uniquely in either relation. A packing is obtained through an assignment of the modules into the rooms followed by a compaction procedure. Changing the assignments by swapping the contents of two rooms, a simulated annealing strategy is implemented to search for a good packing. Empirical results show that hundreds of rectangles are packed with a quite good quality in area efficiency. A wide adaptability is demonstrated specific to IC layout design. Ideas to handle a multilayer, nonrectangular chips with L-shaped modules are suggested