Technique for planning of terminal locations of leaf cells in cell-based design with routing considerations

Bharat Krishna, Chien Yi Roger Chen, Naresh K. Sehgal

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

In any cell-based design methodology, usually, a library of cells is designed without prior knowledge of where each cell may be used. The cells from the library are placed and routed to construct the physical implementation of a circuit. The cells are designed to minimize the layout area and a little consideration is given to the location of the interface terminals. This can hinder the design of high performance circuits as the routing phase may produce interconnects with excessive signal delays. We present a new top-down design flow in which the contents of leaf cells are constructed after the cell placement has been done. with area minimization as the primary goal. Based on this placement, we design the locations of interface terminals for the leaf cells. Our proposed method optimizes leaf cell interface on the basis of cell placement and global interconnect. Our experiments show that, with this new technique, we can achieve denser and high performance layouts. Our algorithm for planning of terminal locations minimizes the number of master cells needed for multiple instances of cells, thus minimizing the cell layout effort. Our results show a reduction in total Manhattan net length of 28%-75%, which implies a decrease in interconnect delays and does not cause significant increase in cell area.

Original languageEnglish (US)
Title of host publicationProceedings of the IEEE International Conference on VLSI Design
Editors Anon
PublisherIEEE Computer Society
Pages53-58
Number of pages6
StatePublished - 1998
Externally publishedYes
EventProceedings of the 1998 11th International Conference on VLSI Design - Chennai, India
Duration: Jan 4 1998Jan 7 1998

Other

OtherProceedings of the 1998 11th International Conference on VLSI Design
CityChennai, India
Period1/4/981/7/98

ASJC Scopus subject areas

  • Engineering(all)

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    Krishna, B., Chen, C. Y. R., & Sehgal, N. K. (1998). Technique for planning of terminal locations of leaf cells in cell-based design with routing considerations. In Anon (Ed.), Proceedings of the IEEE International Conference on VLSI Design (pp. 53-58). IEEE Computer Society.