PURPOSE: To enable contents to be referred, and coincident key string data set to be efficiently accessed by comparing string data externally inputted with data in each column block, and performing coincidence retrieving marking some column blocks. ;CONSTITUTION: In writing data in a memory cell array, some word line is selected and a cell is connected to a bit line, pairs of IO line pairs of 100 to 107, /100 to/107 are connected to bit line pairs of B0-B7, /B0-/B7. Write-in is serially performed for cells belonging to a selected word line by 8 bits. After selecting a word line, and after an IOGON signal is made to be in H state and CRC is reset, a SAC signal is made to be in a H state of a pulse like and all cyclic write-in circuits CRC are made to be in a selected state. Next, when a CR signal is given in pulse like, an IOG signal is made to be in a H state during being in a H state of the CR signal, a pair of I/O line is connected to a bit line. That is, the circuits CRC are selected sequentially for each pulse of the CRC and connected sequentially to the I/O line by light columns. Data is given to the I/O line and written in a cell.;COPYRIGHT: (C)1995,JPO
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