Automatic designing system capable of designing a logic circuit

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364490, 364489, 364488, G06F 1560

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active

054043123

ABSTRACT:
In a computer aided design system for designing a logic circuit including a plurality of functional blocks connected through path nets to determine a final routing layout under a circuit constraint from an initial routing layout. A path length is determined in relation to a routing path of the initial routing layout. A limiting path length is also determined in relation to the routing path in consideration of a predetermined delay time determined by the circuit constraint. The initial routing layout is successively renewed into the final routing layout in accordance with the path length and the limiting length until the circuit constraint is satisfied.

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"A Hierarchical Routing System for VLSIs Including Large Macros" by Hiwatashi et al., IEEE 1986 Custom Integrated Circuits Conf., pp. 285-288.
"Timing Influence Layout Design" by Burstein et al., IEEE 22nd Design Automation Conf., 1985, pp. 124-130.
"Timing Analysis for NMOS VLSI" by Jouppi, IEEE 20th Design Automation Conf., 1983, pp. 411-418.

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