| 摘要 |
PURPOSE:To maintain the same correct data extending over a long period of time, by rewriting the output of a majority-decision into the odd-numbered memories synchronizing with the dissidence signal of a dissidence detection circuit which receives the outputs of the memories. CONSTITUTION:When the odd-numbered rewritable memories 1-1 to 1-n maintain correct data in them while the same data are stored. Majority-decision circuit 2 outputs correct data and dissidence detection circuit 3 outputs no dissidence signal. Therefore, memory write circuit 4 never writes data into memories. When the data of half the memories and below in the memory group are supposed to be inverted due to an inefficient write, a dissidence signal is outputted from circuit 3. Circuit 2, on the other hand, generates the correct-data output continuously. Circuit 4, therefore, rewrites the correct data into the memory group synchronizing with the signal of circuit 3, so that outputs of memories 1-1 to 1-n will all be correct data. |
