Abstract
This chapter discusses new features of very large scale integration (VLSI) system design used in making expert systems. It describes NELSIS (NEtherLands System In Silicon) framework for designing VLSI circuits and systems. NELSIS is an open design system to be operated from designers' workstations. The NELSIS framework allows a chip designer to retrieve relevant information on the design process, to select design objects, and to activate design tools in a uniform and integrated fashion. Its kernel is a configurable meta data storage module, based on the semantic data model object-type oriented data model. The chapter discusses hierarchical interactive row-graph integration (HIFI), developed at the Delft University of Technology. It is a design methodology for implementing signal and image processing algorithms on VLSI processor arrays. The high-level design process consists of the translation of a numerical problem to a parallel algorithm and the subsequent mapping of this algorithm on either dedicated VLSI hardware or a programmable multiprocessor system. HIFI supports the generic specification of both the behavior and the structure of a design, including the use of functions and cells.
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