| 摘要 |
PURPOSE:To attain the exchange of information between two CPU over a main memory by using a boundary register update/read control circuit to control the updating and reference of the boundary register that sets the boundary between the main storage areas to be allocated to both CPU. CONSTITUTION:The addresses of a main storage device 5 given from the allocation setting address main storage control circuits 3 and 4 of a boundary register 7 are compared with each other. Then access is given exclusively to the storage device 5 via a CPU 1 or CPU 2 if the address of the storage device 5 is set within a set address. The set contents of the register 7 are referred to or updated via a boundary register update/read control circuit 6 that works in response to the CPU 1 or CPU 2. Thus the main storage area can be enlarged or reduced dynamically. In such a way, information can be transferred between both CPU over the main storage area.
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