Cloning method and system for hierarchical compaction

Details Cloning method and system for hierarchical compaction Cloning method and system for hierarchical compaction

1992-11-02

1994-01-25

Thomas, Tom

Fishing, trapping, and vermin destroying

364491, H01L 2100, G06F 1500

Patent

active

052815587

ABSTRACT:
A computer system and computer-implemented method for compacting the geometrical area of a hierarchical integrated circuit layout. The present invention is particularly adapted for use with layouts including over-the-cell routing (OTCR). The inventive method includes the general steps of normalizing the cells, compacting the cells, then reconstructing the layout that includes the normalized cells. More particularly, the step of normalizing the cells includes initial step of identifying an overlapping object produced from the OTCR that overlaps one of the instances. That overlapping object is then divided into an overlapping segment and a non-overlapping segment. The overlapping segment is then removed from the cell and copied into the leaf cell of the overlapped instance. The overlapping segment is defined as a special object of the cell into which it is copied.

REFERENCES:
patent: 4882999 (1989-12-01), Shiraishi et al.
patent: 4965739 (1990-10-01), Shaw et al.
patent: 5124273 (1992-06-01), Minami

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