Memory update history storing apparatus and method for restoring

Details Memory update history storing apparatus and method for restoring Memory update history storing apparatus and method for restoring

1997-05-09

2000-11-14

Beausoliel, Jr., Robert W.

Error detection/correction and fault detection/recovery

Data processing system error or fault handling

Reliability and availability

G06F 1100

Patent

active

061484164

ABSTRACT:
A before-image buffer controller is arranged separately from a memory controller and is connected to a system bus. When there is a write access request from a CPU to a cache memory corresponding to this CPU, the before-image buffer controller is automatically started in response to a command issued from this cache memory onto the system bus, and issues a command for reading previous data from a main memory. Since the before-image buffer controller operable independently of the memory controller is arranged in this way, a memory state restore function can be easily realized by using an existing computer system as it is without changing a memory controller.

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