| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability of data whose form is of mirror type and to realize a function correcting an error of mirror data. SOLUTION: Data of plural memory cells (MC0-MCm) read out to plural first data lines (PH0-PHm) are synthesized by a synthesizing/rewriting circuit 1, transmitted to a second data line DP, also, this synthesized data are rewritten again to the first data line. The synthesizing/rewriting circuit 1 performs addition processing at the time of synthesizing.
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