| 摘要 |
PURPOSE:To simultaneously read and write data in the same address by reading the data while an active signal is active when a reading signal and a writing signal are simultaneously active and writing the data with the delay of a delay circuit. CONSTITUTION:A device is provided with the selection circuit 1 of the reading signal 102 and the writing signal 10 and an address and data storing circuit 2 in random access memories 3, 5. The selection circuit 1 of the reading and writing signals is constituted of a comparison circuit for comparing the writing signal with the active signal and the delay circuit 4 for delaying a signal outputted from the comparison circuit, reads the data when the reading signal 102 and the writing signal 100 are simultaneously active and writes the data with the delay for the delay circuit. Thereby, when the reading signal and the writing signal are simultaneously inputted, the written data is stored and after the data is read, the data is written.
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