Fujitsu Corporation

Masaharu Nishimura

Yasuhiro Yamashita

Akira Katsumata

Kazuyuki Iida

Masato Ariyama

Toshiyasu Sakata

Yoshiyuki Iwakura

Ryoji Yamada

Hiroshi Miura

Mitsunobu Okano

Hiroyuki Orihara

Mitsuru Yasuda

Hirofumi Hamamura

Atsushi Yamane

Naoki Murakami

Ryouji Yamada

Mieko Teranishi

Kazufumi Iwahara

Interactive CAD apparatus for designing packaging of logic circuit design

This invention is directed to a method and apparatus to find out an optimum solution in automatic routing or automatic placement with certainty and at a high-speed to improve a routing rate, and to realize automatic routing in a high-density. To these end, a routing approach is selected in a conversational mode while routing efficiency is consulted to compose routing processing procedure so as to generate a routing program. Besides, component placement processing procedures designated according to placement control information are combined to generate the placement program. A straight line between component pins adjacent to each other is defined as a chord, a wave for maze method routing is generated from a start point toward an end point of a routing path and propagated between the chords adjacent to each other. Positions of the chords through which the wave has passed until reaching the end point from the start point are successively stored and the positions through which the wave has passed is traced back to the start point from the end point when the wave reaches the end point to decide a routing path of the routing pattern. The method and apparatus of this invention are applicable to routing design or component placement design of LSIs, multichip modules, printed circuit boards, etc.

Routing program generating method and apparatus therefor, placement

A wiring CAD apparatus wherein a situation of a noticed event can be identified at a moment on a screen. The wiring CAD apparatus comprises a searching timing detection section for detecting a new displaying processing/deletion processing timing as a searching timing for a non-wired pin, a non-wired pin searching section operable in response to the searching timing detected by said searching timing detection section for searching the non-wired pin, and a display data production section for producing display data in accordance with which the non-wired pin searched out by said non-wired pin searching section is to be displayed on a display section in a visually distinguishable condition from another already wired part pin. The display data produced by said display data production section is displayed on the display section under the control of a displaying control section. The wiring CAD apparatus can be applied to a CAD system with which wiring designing for an LSI, an MCM, a PWB or the like can be performed interactively.

Wiring CAD apparatus

Growing community of inventors

Kawasaki, Japan

Masaharu Nishimura