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Genetic Algorithms for VLSI Design, Layout and Test Automation
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From the Inside Flap
Preface This book describes how genetic algorithms (GAs)can be utilized for developing effcient computer-aided design (CAD)tools for performing VLSI design optimiza- tion,layout generation,and chip testing tasks.It is written primarily for practicing CAD engineers and academic researchers who want to apply GAs and analyze their performance in solving large VLSI/CAD optimization problems. Although GAs were developed over twenty-five years ago, not much research and experimental work have been done to ascertain their capabilities in solving complex and extremely large constrained combinatorial optimization problems that one generally encounters in designing VLSI/CAD tools. Unlike graph theoretic approaches, integer/linear programming, simulated annealing, and a host of other optimization techniques that have been quite successfully deployed as core problem solving methods in various VLSI/CAD tools, GAs are not yet as widely used. We hope that this book will motivate readers to widely apply GAs in developing VLSI/CAD tools. For this purpose, we have carefully selected a few important VLSI design automation problems with unique problem solving features, and we have shown how in each case, various aspects of the GA, namely its chromosome, crossover and mutation operators, etc., can be separately formulated to solve these problems. In order to estimate the e ffectiveness of GAs, we have compared their performance with conventional algorithms. While most of the solution techniques proposed in this book have been developed in an ad hoc and exploratory manner,the basic formulations of the GAs are, nevertheless, applicable to a range of related problems. However, further experimentation is needed to find better settings of GA parameters for each problem. If the empirical study is also combined with insightful mathematical modeling, then we strongly believe that the performance of the genetic-based tools can be further improved and real payoffs of the use of GAs in CAD tools can be demonstrated. The main objectives of this book are: to aggregate various genetic-based research work performed by the authors and their coresearchers at The University of Michigan, Ann Arbor, and the University of Illinois, Urbana,as well as by colleagues at the University of Iowa, Iowa City; to educate readers in the VLSI/CAD community about the merits of GAs by demonstrating some sample solution techniques; to motivate readers to develop improved techniques with appropriate mathematical formulations; and finally, to encourage readers working in other fields of science and engineering to explore the GA as a powerful method for solving problems in their areas of work. We have included sufficient introductory material to enable a reader who is not well-versed in GAs to know how to use them effectively. It is our sincere hope that in the future, GAs will prove to be a general-purpose heuristic method for solving a wider class of engineering and scientific problems. Another purpose of this book is to foster research work on the development of distributed CAD tools that run efficiently on a network of workstations. Originally, Prof.Mazumder's research group was intrigued by the intrinsic parallelism of GAs and the group embarked upon this research work with a view toward developing a suite of VLSI layout tools that can efficiently utilize the distributed resources of a network of workstations loosely connected through a local area network. With the availability of inexpensive personal computers and workstations that can be linked via an Ethernet type network, the CAD tool development environment has dramatically shifted from a single powerful uniprocessor to a cluster of networked desk-top computers. The main goal for developing this suite of distributed layout tools was to demonstrate that GAs are uniquely suited for running concurrently on a number of workstations without requiring much communication overhead. In the recent past, some existing layout tools have been successfully modified to run efficiently on tightly coupled shared-memory (e.g., Sequent's bus-based Balance) and message-passing (e.g., Intel's hypercube) machines. In order to achieve high speedup, these algorithms require frequent data exchange between two or more processors in a cluster. However, by and large, conventional layout algorithms are not amenable to parallelism on a network of workstations. As VLSI chips are reaching the integration level of one hundred million transistors and more, chip design tasks are becoming extremely complex and computation intensive. New generation CAD tools must be able to run in parallel over a large number of inexpensive computers interconnected together by a local area network. It will therefore be worthwhile to invest an effort in developing genetic-based CAD tools. Organization of the Book There are three distinct classes of VLSI problems which the book addresses: (1) the layout class of problems,such as circuit partitioning, placement, and routing; (2) the design class of problems, including power estimation, technology mapping, and netlist partitioning; and, finally, (3) reliable chip testing through efficient test vector generation. All these problems are intractable in the sense that no polynomial time algorithm can guarantee optimal solution of the problems, and they actually belong to the dreadful NP-complete and NP-hard categories. The book is organized as follows. Chapter 1 provides an introduction to the two basic types of GAs: the simple genetic algorithm and the steady-state algorithm. GA terminology is introduced and genetic operators are discussed. A simple test generation example is used to illustrate the operation of a GA, and then GAs for problems in VLSI Design, Layout, and Test automation are introduced. Chapter 2 addresses the problem of circuit partitioning. It begins with a review of previous approaches used and then describes a steady-state GA for solving the problem. Experimental results are presented and a hybrid GA that incorporates local optimization is described. Chapter 3 focuses on automatic placement for standard cells and macro cells. A GA for standard cell placement is described, results are presented, and the genetic approach is compared to simulated annealing. In addition, an algorithm that combines a GA and simulated annealing for macro cell placement is discussed. Chapter 4 discusses problems encountered in macro cell routing. It begins by addressing the Steiner problem in a graph. Previous approaches are reviewed, a GA to solve the problem is described, experimental results are presented, and comparisons are made to previous work. Finally,the GA for the Steiner problem in a graph is applied to the macro cell routing problem and results are presented to demonstrate the effectiveness of this approach. Chapter 5 describes a GA for FPG technology mapping, which is a key phase of logic synthesis and involves partitioning the circuit into a number of subcircuits that are not necessarily disjoint. Application of circuit partitioning to pseudo-exhaustive testing is also addressed, and experimental results are given for FPGA technology mapping. Chapter 6 discusses the problem of automatic test generation. A GA framework for test generation is presented and results of experiments to evaluate various GA parameters are given. Integration of GA s with deterministic algorithms and incorporation of problem-specific knowledge into a GA are discussed. The chapter concludes by describing how the GA framework can be applied to the problem of test sequence compaction. Chapter 7 deals with power estimation for VLSI circuits. In particular, it describes a GA for estimating the peak power dissipation in a circuit. The peak power estimates provide a tight lower bound on the actual peak power and are significantly more accurate than previous approaches. The actual sequences of vectors that achieve these bounds are also generated by the GA. The effects of the delay model used on the quality of the results are also discussed. Chapter 8 explores parallel implementations of GAs for standard cell placement and test generation. The migration operator for parallel GAs is introduced in this chapter. GAs that require little communication between processors and are therefore suitable for a network of workstations are described. Experimental results are presented to illustrate the effects of various communication patterns. Very good speedups are achieved, as demonstrated for several benchmark circuits. Chapter 9 concludes the book by giving guidelines for devising a GA to solve a new problem in the area of VLSI design, layout, and test automation or in another domain of science and engineering. Problem encoding, fitness function,type of GA, and GA parameters are addressed, and the genetic approach is compared to conventional approaches. Applicability of the Book This book is intended for design engineers and researchers in the fields of VLSI and CAD. The book introduces the main concepts of GAs in a simple and easily understandable way that may encourage first time users to
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From the Back Cover
1156F-7 Genetic algorithms mimic the natural process of evolution, helping engineers optimize their designs by using the principle of "survival of the fittest." VLSI is especially suited to benefit from genetic algorithms - and this comprehensive book shows you how to get the best results, fast. You'll discover how genetic algorithms work and how you can use them in a wide variety of VLSI design, layout, and test automation tasks, including: Circuit partitioning Macro cell routing, including Steiner problems and global routing Standard cell and macro cell placement Circuit segmentation,FPGA mapping and pseudo-exhaustive testing Automatic test generation including compaction, eterministic/genetic test hybrids and integration of finite state machine sequences Peak power estimation You'll find essential insights into problem encoding and fitness functions; coverage of advanced parallel implementations; and much more. Specific experimental results are presented for every application - as are detailed problem descriptions and easy-to-adapt examples. Genetic algorithms are already being incorporated into leading electronic design automation systems. Leverage their full power now - with Genetic Algorithms For VLSI Design, Layout, and Test Automation.
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Product details
Paperback: 338 pages
Publisher: Prentice Hall; 1 edition (December 20, 1998)
Language: English
ISBN-10: 0130115665
ISBN-13: 978-0130115669
Product Dimensions:
6.9 x 0.9 x 9.4 inches
Shipping Weight: 2 pounds (View shipping rates and policies)
Average Customer Review:
5.0 out of 5 stars
1 customer review
Amazon Best Sellers Rank:
#2,876,180 in Books (See Top 100 in Books)
it is very good.fast and excellent
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