Semiconductor integrated circuit device

Abstract

PURPOSE:To arrange a power source wiring for reinforcement at the best position to realized a desired circuit, by constituting a forming position of the power source wiring for reinforcement so as to be changeable according to the desired circuit. CONSTITUTION:The trunk lines of a power source wiring, 4a and 4b, are arranged around a basic cell row 3, and further power source wirings for reinforcement, 5a and 5b, are arranged between a pair of parallel sides of the trunk lines of a power source wiring, 4a and 4b, so as to cross perpendicularly to the basic cell row 3. Basic cells 2 are arranged also under the power source wirings for reinforcement, 5 and 5b. the power source wirings for reinforcement, 5a and 5b are not fixed wirings, and their forming positions are changeable according to the circuit to be constituted, so that the design freedom to constitute a desired circuit can be increased. In the case of automatic design applying CAD to realize a circuit possessing desired integration degree and logic functions, the power source wirings for reinforcement, 5a and 5b, can be arranged at the optimum position for design.

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    Publication numberPublication dateAssigneeTitle
    JP-H02268439-ANovember 02, 1990Hitachi LtdSemiconductor integrated circuit device