JPS615500A - Memory integrated circuit - Google Patents

Abstract

PURPOSE: To improve the reliability of a memory integrated circuit with simple constitution by reading the same data written in the entire data width of plural bits, selecting the odd-number pcs. of data, stopping an output of an erroneous bit after the prescribed processing is applied and simultaneously selecting not- used bits.

CONSTITUTION: The same data written in the entire data width of four bits, etc., read out from a memory cell 14 is stored in a data output buffer 21. The data of three bits, etc., is selected through an output selection circuit 22 controlled by an erroneous bit memory circuit 27, and outputted through a majority decision circuit 24. When the data of three bits has errors, the circuit 22 controlled by the circuit 27 stops the output of bits where errors exist, and selects and outputs non-used bits. Thus the reliability of a memory integrated circuit can be improved with simple constitution where a code generator circuit, code decoding circuit, data correction circuit, etc., need not be made complicated along with an increase in bits.

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