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https://hdl.handle.net/2142/69355
Description
Title
Hierarchical Approaches to Vlsi Circuit Layout
Author(s)
Sarrafzadeh, Majid
Issue Date
1987
Department of Study
Electrical Engineering
Discipline
Electrical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Electronics and Electrical
Abstract
This thesis studies two hierarchical approaches to the circuit layout problem: the top-down approach and the bottom-up approach.
The first part is devoted to the traditional top-down approach, and particularly, to an important subproblem thereof called the Channel Routing Problem (CRP). The complexity of CRP in three different layout modes--the reserved mode, the knock-knee mode, and the restricted-overlap mode--is studied. Besides the conventional square grid, two new grids, the alternate grid and the 45(DEGREES) grid, are considered, and their respective versatility is assessed.
In the second part, a novel bottom-up technique for solving the layout problem is proposed. The strategy is to recursively interconnect a set of modules, in conformity with the design rules. The basic step consists of merging a pair of strongly-connected modules. This technique is elaborated on and the fundamental problems of this approach are discussed.
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