| 摘要 |
PURPOSE:To detect easily the various abnormal access of a memory by using an RAM to be written by a CPU, as the memory block managing memory of the memory. CONSTITUTION:A write inhibiting, a read-out inhibiting and a fetch inhibiting flags, etc. are written through a CPU P in accordance with a block in each area of a managing memory 10 formed by an RAM corresponding to an address of each block of a memory 1. In this state, the memory 10 is accessed through an address decoder 11, and when it coincides with the sorted contents of a control signal passing through a control bus 2 in a sub-data bus controller 12, the present access is decided to be the access of the inhibited block to apply an interruption signal to the CPU P from the controller 12. The various abnormal access of the memory can be detected easily by a system using a managing RAM, without using the managing switch, the managing latch, etc. |
