Method of making a semiconductor memory device having error checking/correcting functions

摘要

A semiconductor memory device having error checking/correcting functions includes a circuit (10) for generating a code for error checking/correcting based on information externally supplied and linking the information and the code to be transmitted to a memory cell array (1), and another circuit (11) for error checking and correcting read-out information from the information and the code which are read-out from the memory cell array so as to output correct read-out information. The code word generating circuit (10) and the error checking/correcting circuit (11) are formed of a masked ROM integrated on the same semiconductor chip (100) as that of the memory cell array (1) in the memory device.