Semiconductor integrated logic circuit device using a pass transistor

Abstract

The semiconductor integrated circuit enjoys a high performance and can be produced at a low production cost and within a short time. A cell has an internal circuit connection such that an output terminal is connected to a plurality of input terminals through source-drain paths of active devices connected in the tree form, and gate electrodes of the active devices are connected to other input terminals. Two such cells having the same internal circuit connection, the same disposition of the internal circuit devices and the same disposition of the input / output terminals are disposed on the same chip, and mutually different logics can be accomplished by changing the form of application of input signals from outside the cells to the input terminals. A chip area of an integrated circuit designed by CAD using a cell library can be reduced and a high speed circuit operation can be attained. The present invention provides remarkable effect for improving performance of an ASIC, a microprocessor, etc., and for reducing the cost of production.

Description

BACKGROUND OF THE INVENTIONThis invention relates to a semiconductor integrated circuit device and a method of producing the same. More particularly, the present invention relates to integrated circuit devices such as an application specific I.C. (ASIC), a microprocessor, a microcontroller, a digital signal processor, etc., and a method of efficiently producing them.Systems such as gate arrays, standard cells, cell based ICs, etc., have been widely employed in the past to accomplish a large-scale logic circuit, in particular. A characteristic feature of these integrated circuits is that partial circuits referred to as "cells" are prepared in advance.The term "cell" means a small scale logic circuit such as NAND, NOR, etc., for which layout of a mask pattern has already been finished. Generally, the positions of input / output terminals and an operation speed are determined besides the mask layout.When information on this cell is gathered and registered to an auxiliary memory unit of a...

AI Technical Summary

Benefits of technology

However, the logic functions accomplished in a cell library shown in FIG. 5A is the same as that accomplished in the conventional standard cell library, such as AND and OR. Therefore, the cost of preparing the library is not reduced.

It is a further object of the present invention to make it possible to conduct CAD design of a semiconductor integrated circuit inclusive of the cells described above, and to produce the semiconductor integrated circuit on the basis of the design.

Problems solved by technology

A great deal of labor are necessary to prepare such a large number of cells.

As a result, the area of the integrated circuit and its delay time as well as power consumption becomes great.

In other words, the reduction of the number of cells registered is not a realistic solution from the aspect of performance.

The integrated circuit accomplished by the combination of the cells is not always most suitable for the intended logic function, and is inferior to an optimum circuit in every aspects of the speed, the area and power consumption.

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