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An Algorithm to Compact a VLSI Symbolic Layout with Mixed Constraints

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2 Author(s)
Yuh-Zen Liao ; IBM Thomas J. Watson Research Center, Yorktown Heights, NY, USA ; Wong, C.K.

A popular algorithm to compact VLSI symbolic layout is to use a graph algorithm similar to finding the "longest path" in a network. The algorithm assumes that the spacing constraints on the mask elements are of the lower bound type. However, to enable the user to have close control over the compaction result, a desired symbolic layout system should allow the user to add either the equality or the upper bound constraints on selected pairs of mask elements as well. This paper proposes an algorithm which uses a graph-theoretic approach to solve efficiently the compaction problem with mixed constraints.

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Computer-Aided Design of Integrated Circuits and Systems, IEEE Transactions on  (Volume:2 ,  Issue: 2 )