Leaf Cell and Hierarchical Compaction Techniques (The by Cyrus Bamji

By Cyrus Bamji

Leaf cellphone and Hierarchical Compaction Techniques offers novel algorithms built for the compaction of huge layouts. those algorithms were applied as a part of a approach that has been used on many business designs.
the point of interest of Leaf mobilephone and Hierarchical Compaction Techniques is three-fold. First, new principles for compaction of leaf cells are awarded. those cells can diversity from small transistor-level layouts to large layouts generated via automated position and direction instruments. moment, new techniques for hierarchical pitchmatching compaction are defined and the concept that of a Minimum Design is brought. The method for hierarchical compaction is equipped on best of the leaf mobile compaction engine and makes use of the algorithms applied for leaf cellphone compaction in a modular style. 3rd, a brand new illustration for designs referred to as Virtual Interface, which permits for effective topological specification and illustration of hierarchical layouts, is printed. The digital Interface illustration binds all the algorithms and their implementations for leaf and hierarchical compaction into an intuitive and easy-to-use process.
From the Foreword:
`...In this ebook, the authors supply a finished method of compaction in keeping with conscientiously conceived abstractions. They describe the layout of algorithms that supply actual hierarchical compaction according to linear programming, yet decrease the complexity of the computations via advent of leading edge representations that catch the provably minimal volume of required details wanted for right compaction. In so much compaction algorithms, the complexity is going up with the variety of layout gadgets, yet during this technique, complexity is because of the irregularity of the layout, and consequently is frequently tractable for many designs which include significant regularity.
the following the reader will locate a sublime therapy of the various demanding situations of compaction, and a transparent conceptual concentration that gives a unified method of all features of the compaction task...'
Jonathan Allen, Massachusetts Institute of Technology

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Extra info for Leaf Cell and Hierarchical Compaction Techniques (The Springer International Series in Engineering and Computer Science)

Example text

In this section the compactor is allowed to modify, in a limited fashion, the shape of some of the objects in the layout, thus enabling additional area gains to be realized . Most of these gains can be achieved by introducing a single shape modifying operation called jogging. Jogging transforms a wire segment into a series of three or more connected wire segments alternating in direction and with the same layer and width. Through the use of this one single operation, layout area can be reduced by over 30%.

The limiting group and the current groups are merged to form a new group. The new group is then evaluated for splitting into sub-groups. The splitting operation identifies sub-groups within the merged group that has a stronger negative weight. There are three levels of splitting operations called Shead, Shear2 and Shear3. The three shears along with the correctness of the algorithm is outlined in [44]. 9 Wire Jogging AUTOMATIC JOGGING OF WIRES The role of compaction is to move objects in the layout to minimize some objective function, normally layout area.

7 described the problem formulation for compaction in X direction without wire length minimization. Vso and VSI in V are the special vertices for the left and right boundaries of the layout. Solving the constraints in E gives legal values for the vertices in V. The minimum width of the layout W is given by VSI - Vso. During wire length minimization, the width of the layout is' kept constant. 14 Need for Wire Length Minimization 36 CHAPTER 2 Ew = EU{VSI - VSO = W} Now the objective function for the wire length minimization in the X direction is to minimize the sum of the lengths of all the horizontal wires subject to the constraints in Ew.

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