Hermod is an interactive behavioral synthesis program developed at Stanford University. Using a combined control and data flow graph (C/DFG) as an intermediate representation, Hermod generates functional blocks and their interconnection from L -havioral descriptions. Hermod supports a menu-driven interface, displaying the control and data flow graph with a set of legitimate dming-cus and its hardware representation.Emphasizing user participation, the system allows the user to control state partitioning and resource sharing through a graphical interface to explore the maximal design space. Written in an objectoriented language C++, Hermod generates a hardware representation in several minutes C from a behavioral description of practical size on a VAXstation H/GPX.• -Indexing Terms: behavioral synthesis, structural synthesis, control and data flow graph, register-transfer level description, design space exploration.

Recent advances in the technology of microelectronics have changed the design rule for printed wiring boards, allowing the number of wiring tracks between consecutive pins of an ordinary dual in line package (DIP) to be two or more. When the wiring density augments to that extent, conventional routers are confronted with various difficulties. To cope with this situation, the single‐row router which has topological fluidity can be employed in conjunction with the line‐search router. We have already developed a new routing system constructed of a line‐search router combined with a single‐row router and of a maze‐running router. However in each routing process there are many parameters, the combination of whose values have much influence on the wiring performance of the whole system. In this paper we outline this routing system, describe some experimental results in order to determine values of these parameters, and show that the analysis of implemented results suggests high performance for high density printed circuit boards (PWB's).

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