DAC

This paper represents a fairly extensive survey of the literature on the interconnection problem. The topics covered are: Pin Assignment, Layering, Ordering, Wire List Determination, Spanning Trees, Rectilinear Steiner Trees and Wire Layout. In addition,...

To minimize vias in a printed circuit board it is valuable to assign each wire to a layer of the board, and to try one-layer paths for each wire before attempting paths with vias. The basis for making the assignment is to minimize a measure of ...

This paper examines the relationship between the pin assignment for circuit cards and the routability of the multilayer printed wiring backplane on which the cards are mounted. It is shown that the pin assignment should meet three objectives in order to ...

Multilayer printed wiring backplanes cause a special problem for design automation. The very size of the problem tends to make routing techniques which are satisfactory for smaller boards prohibitively expensive for larger ones. At the same time, ...

This paper presents an algorithm for finding optimum routings for interconnection paths in a channel between two parallel rows of circuit cells.

The algorithm, although based on branch and bound, has provided optimum routings for circuits with 50 to 60 ...

A stand alone minicomputer and a comprehensive software system including a tape puncher and reader provide a rapid automated verification of input data from schematic to artwork.

The techniques employed and the reasons for early lack of productive results on a software DA project are discussed. Suggestions for future projects are given.

To anyone that has had the slightest connection with the design and construction of large programs for digital computers, it is obvious that it is not a trivial task.

What may not be so obvious is the almost complete lack of automation that has been ...

The guidelines presented here are based on experience gained during several years of designing and implementing large interactive CAD programs on many large scale T/S Computers. These include: circuit, system, logic, and optical analysis programs which ...

The topic of this paper is a Partitioned Ring Structure Processor (PRSP) which is a data structure system that has been designed for small computers. PRSP provides techniques of creating and traversing very complex network type structures as ...

Over the past few years, a team of Kennedy Space Center Civil Service software engineers has specified a standard language for test and ground aerospace operations. The language is intended to be used for test procedure definition for all levels of ...

The system described in this article is called ARCHIT. Perhaps the clearest way to understand how the system operates is to give a brief description of a user example. Before we do this we will explain a little about the technical aspects of the system. ...

In the Architectural field many computer programs exist for design aid. They vary from space allocation algorithms to structural analysis and computer graphic design. More often than not, these programs are independent. Even though most of the ...

An operational CAD system for assisting office planners in designing large office interiors considering functional, physical, and organizational interactions.

The development and the subsequent exposure of automated space planning methodologies has grown to the point where they are now acceptable and readily available preliminary architectural design tools.

This paper describes a system of computer programs ...

The involvement of the computer in architectural design is aimed, to a large extent, at the generation of conceptual layouts - topologies - for arrangement problems. (“Topology”, according to encyclopedia Britannica: a geometry in which the shape and ...

Injecting a single fault into a fault-free digital network creates a “bad” network which is only slightly dissimilar from the original. Injecting the same stimuli (signals) into both of these networks will produce activity sequences which are often ...

This paper attempts to identify the capabilities required to be present in a logic simulation system in order to make it an effective analysis tool for logic design verification and test verification.

Digital simulation is defined as the process of exercising a realistic software model of a digital system, with sets of input stimuli, to generate signal behavior versus time. Simulation processes can be categorized by their simulation atom. Gate-level ...

Interactive computer aids for integrated circuit layout usually offer a choice between slow, high-precision plotters or fast, low-resolution interactive media. A system, called GRAFOS, has been designed, which attempts to overcome resolution limitations ...

A computer program is described which was developed for LSI (large scale integrated) systems to resolve the uncertainties in transient delays prior to building the physical logic systems. This computer program represents a departure from the ...

Study of large size electronic switching systems (ESS) commenced in 1964 in Japan, expecting it to be a center of communication and processing in the near future information innovation. During this period, DEX-1, DEX-2, DEX-21 and D10 systems were ...

This paper describes the history, the present status of this DA and also the problems to be solved to meet the age of LSIs.

Totsuka, Kanagawa, Omika and Musashi Works of Hitachi Limited have developed CAD (Computer Aided Design) systems for electronic parts and equipment. Also Hitachi Central Laboratory and Hitachi Laboratory, which are engaged in basic and application ...

This description is intended for the purpose of relating a brief history of the development of the design automation system in our OKI Electric Industry Co., Ltd. and an outline of the design automation system used at present in our company; it relates ...

Because the computer is playing an increasing important role in the community, its availability has become an essential and inherent factor. The availability of a computer is defined by the formula:

availability = 100 × MTBF/(MTBF + MTTR) (%)

where ...

In this paper, the present status of DA system, which is used in designing computers in NEC is introduced, and the development procedure and use of this system are described. Then, on the basis of the actual results of this system, the future problems ...

This paper deals with the design of the housings of electrostatic precipitators. While it is expected that few people will be concerned with electrostatic precipitator housings, the general principle should have broad applicability. The product being ...

This paper presents a description of the CAMS program and its current capabilities, some insights gained into the development of a large multi-discipline design automation system and future plans and possibilities for CAMS development. Figures and ...

The computer simulation of internal combustion engines is a task that numerous researchers have contributed to in recent years, primarily because of the advent of digital computers with large storage and fast processing capabilities. Engine simulation ...