Vintage 1981-06

Set of Design Tools

At this time a set of design tools Fig. 1 was in place that allowed the designer to create relatively large circuits. The set contains three editors for entry of data. ED is a general-purpose text editor. ICS is a graphics editor used for the design of masks. DRAW is also a graphical editor but is used for schematic data entry rather than entering mask data. Both DRAW and ICS are described in other articles in this issue. Fig. 1 also shows the various simulators. SUPREM is a process-level...

By Thomas H Baker

The first installation of the HP Interactive Graphics System IGS was within Ihe Integrated Circuit Department ot HP's Loveland Instrument Division. IGS soon proved to be a valuable design tool and simulated .merest in providing such design aids to designers within their work areas. Convenient access to a responsive, interactive graphics capability encourages a Oesigner to try out designs as part ot a naiural thought process. Specific observations about IGS are The designer can work directly...

By Ebrahim Khalily

As simulation becomes a cornerstone of VLSI design and as technology advances toward fabrication of small-geometry devices for VLSI, greater process control and more accurate simulation models become more important With the increases in the complexity ot device modeis. an automated characterization system is needed to perform quality transistor measurements and provide reliable model parameters interactively and in a reasonable time. The Transistor Electrical Characterization and Analysis...

Structured Hierarchical Design

The structured hierarchical approach is worthy of closer examinalion for several reasons. It has proved very effective in its reduction of design time, use of circuit area, and ability to support a multiple-person design effort. It is also of interest becaose of the close coupling of this strategy with that prescribed by Carver Mead and Lynn Conway in ibeir textbook. Introduction lo VLSI Systems,1 At the topmost level, the hierarchical approach can treat an integrated circuit as a collection of...

By Louts K Scheffer Richard I Dowell and Ravi M Apte

A VLSI CIRCUIT is a complex structure containing tens of thousands of individual transistors. The design of VLSI proceeds from a high-level architectural description down to 1 he layout of the artwork. The circuit design process is lite activity that occurs between Ihe functional description and the start of the physical layout, i lovvever. for integrated circuit design. there is usually no clean separation at either end of the process. System architectures are specified with a final...

By Diane F Bracken and William J McCalla

A LARGE PORTION of the design cycle time of LSI and VLSI circuits is devoted to creating a physical layout and verifying that the layout obeys design rules and represents the intended circuit schematic. 1GS, an HP interactive graphics system,' supports structured, hierarchical design of custom integrated circuits through an advanced, fully integrated set of features. User-definable multilevel symbolic representation and incremental design rule checking facilitate design and layout in an...

Correct the First Time

The difficullies in discovering errors later in Ihe design process were discussed previously. Stan Mintz of HP'sCor-vallis Division in Oregon has proposed a correct-the-firsl-time methodology. Stan proposes that the functional description is the control document for both the development of an IC and any tests that will be applied to it. In addition, as the design progresses through logic, circuit, and mask design, Stan proposes I hat each stage be compared to the functional description....

Circuit Simulation Using Hpspice

The SPICE circuit simulation program developed al the University of California at Berkeley has become a workhorse for the IC industry. SPICE performs a detailed analysis of circuits using the interconnect data from DRAW. Accurate analytical models are provided for the semiconductor devices. The DRAW display ot a basic NMOS NOR gate is shown in i-'ig. 3d. The library of circuit primitives provides the transistors, capacitors, resistors and other SPICE elements. Stored in the associated text file...

Marco Negrete on Structured VLSI Design

WITH THE CAPABILITY of putting 450,000 devices on a chip, enough to implement a 32-bit microcomputer, designers are well into the VLSI era Isee box. page 11 . 1 the trend of 2-to-l increases in density per year established over the last decade continues, we will soon be talking about ultra-LSI. The rewards are great as higher levels of integration are achieved. The most obvious benefit is the dramatic decrease in the cost per function as the cost of a chip is amortized over a larger number of...

By Merrill W Brooksby and Patricia L Castro

IN 1975 HEWLETT-PACKARD established an industrial grant with Stanford University. The major objective was to fund university efforts that could become effective resources for HP integrated circuit facilities. To accomplish this, research and development was divided into two major functions product R&D and facility R&D. Product R&D is directly related to company products sold in the marketplace. Facility R&D enhances engineering efficiency or extends engineering capability in such areas as...

Christopher R Clare

Chris Clare holds a BS degree in electronic engineering from California Polytechnic University 1966 and an MS m electronic engineering tram Stanford University 1968 . He has been with HP Laboratories HPL smce 1966, when he was on the design team for HP's first aesk-top computer Following lhat, he contributed to a variety of logic design and electronic projects and wrote some papers on kinesthetic feedback in keyboards. In 1973 he authored a book, Designing Logic Systems Using State Machines...