| 摘要 |
PURPOSE:To add a mechanism to read out automatically an address immediately after it is written by storing said written address after detecting that a writing command to a main memory device is delivered. CONSTITUTION:When data are written to a main memory device 2 from a CPU 1 or an input/output controller 4, a memory address 7 is preserved at an address latch 9 by a memory write command signal 8. A sequence circuit 13 sends a bus request signal 10 to a system bus 51 to acquire the bus using right and transmits the address signal of the latch 9. Then a memory read command 15 is sent to the bus 51 and the device 2 executes a reading operation in response to the command 15. At the same time, the device 2 checks the parity of a parity check generating mechanism 3.
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