| 摘要 |
PURPOSE:To attain a semiconductor memory system serving as an external memory with high performance by using a high-speed semiconductor element in an active mode of the system, then plural nonvolatile magnetic disk devices when a power supply is cut off respectively. CONSTITUTION:In a rise mode of a semiconductor memory system, a channel 1 stores the memory data on a magnetic disk device 32 to a semiconductor memory element 23 by a memory controller 10 through a port circuit 11 with a restorage indication. The controller 10 supplies the restorage indication to a semiconductor memory element control circuit 22 and a magnetic disk controller 31 through a port circuit 21. Then the controller 31 reads the memory data out of the device 32 and sends it to the circuit 22 via the controller 10. While the circuit 22 stores the memory data to the element 23. The data stored in the element 23 is shunted to the device 32 when a power supply is cut off. An auxiliary memory subsystem 35 works when another auxiliary memory subsystem 30 has a fault. |
