Improving virtual-grid compaction through grouping

Authors:
L. S. Nyland;S. W. Daniel;D. Rogers
Affiliations:
Microelectronics Center of North Carolina, Research Triangle Park, North Carolina;Thinking Machines Corporation, Cambridge, Mass.;Thinking Machines Corporation, Cambridge, Mass.
Venue:
DAC '87 Proceedings of the 24th ACM/IEEE Design Automation Conference
Year:
1987

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Abstract

In the past, Virtual-Grid Compactors have not been well received because they generated sparse layouts. In analyzing this problem, we found three major areas where improvements could be made: breaking the virtual-grid lines into segments; decoupling the placement of non-interacting layers; and eliminating the centered nature of elements. The result is a compactor with substantially better mask generation.