A new placement algorithm for custom chip design

Z. M. Lin, Hung C. Lin

Research output: Contribution to journalConference articlepeer-review


A placement algorithm which consists of three subalgorithms--an O(kn2) circle model relative placement algorithm, an O(n2 log n triangulation algorithm, and an O(n2 log n2) optimal slicing algorithm for custom chip design--is presented. This relative placement algorithm addresses size effect and net connectivity effect simultaneously, while attaining a low polynomial time complexity O(kn2) without loss of global perspective, where k is a constant and depends on the accuracy that the placement required. The triangulation algorithm has O(n2 log n) time complexity. The triangulated planar graph can be used to do the floorplan by either the nonslicing RDG (rectangular dual graph) or slicing embedding methods. The optimum slicing algorithm has O(n2 log n2) time complexity. As expected, the wire length of the placement algorithm is shorter than that of a point model. However, since the optimal values of l0 and DEF (deformation ratio) are unknown, different values for l0 and DEF should be used in different circuits to obtain better placement results.

Original languageEnglish
Pages (from-to)1672-1675
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
Publication statusPublished - 1990
Event1990 IEEE International Symposium on Circuits and Systems Part 3 (of 4) - New Orleans, LA, USA
Duration: 1990 May 11990 May 3

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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