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A hierarchical layout system for VLSI provided with placement and routing facilities is described, highlighting the routing scheme constructed on the basis of a channel router. Several implementation results are also shown to reveal how much the system has potentialities to be of great use in the practice of layout design of full custom LSI's.
An automatic routing scheme intended dedicatedly for general cell LSI is described, which is constructed of a number of algorithms such as for net ordering, global routing, and detailed routing. This scheme is distinctive in that channel constraint loops are broken automatically at the stage of global routing, and a grid-free routing scheme is employed at… (More)
Recent advances in the packaging technology of microelectronics have changed the design rules for <underline>printed wiring boards</underline> (PWB's) such that the number of wiring tracks between adjacent pins of an ordinary <underline>dual in line package</underline> (DIP) is allowed to be two or more, and the number of signal layers to be laminated is… (More)
An automatic placement algorithm for standard cell and polycell LSI is described, which is constructed on the basis of heuristics for a set of interrelated placement subproblems. The algorithm is incorporated into a hierarchical layout system intended not only for standard cell and polycell LSI but for general cell LSI, by which standard cell and polycell… (More)
We examined otolith marks on chum salmon caught in the North Pacific Ocean and Bering Sea during the spring and summer of 2006 and 2007. Otolith marks were detected in 190 of 8,295 immature and maturing fish. Of these marked salmon, 13 fish were found in the North Pacific Ocean and 177 fish were found in the Bering Sea. Approximately 90% of the marked… (More)
PURPOSE Superficial temporal artery (STA)-middle cerebral artery (MCA) bypass is an important technique for cerebrovascular reconstruction. Intraoperative hemodynamic imaging is needed to perform cerebrovascular reconstruction safely and effectively. Optical intrinsic signal (OIS) imaging is commonly used for assessing cerebral hemodynamics in experimental… (More)
A high performance and low power architecture is devised for a 4Mbps infrared wireless communication system dedicated to the mobile computing. In this architecture, 4PPM(4-Pulse Position Modulation) infrared signals detected by an infrared receiver are digitized into TTL interface level pulses, and the digitized pulses are demodulated by a l-bit digital… (More)