JPS6265152A - Memory device - Google Patents

Abstract

PURPOSE:To avoid such a case where the wrong data are stored in a storage means by inhibiting the restoring of data when a saving action is interrupted owing to the generation of a fault and others. CONSTITUTION:A data storage control circuit 3 resets a data saving instruction part 5 before the data stored in a memory 2 is saved to a magnetic disk device 4 and then saves the data. Then the circuit 3 sets the part 5 when the saving of data is through in a correct way. In case some fault occurs while data are saved and the data saving action is interrupted, the part 5 is kept reset as it is. Then the circuit 3 checks the part 5 when the data saved to the device 4 are stored again in the memory 2 and stores the data again as long as the part 5 is set. While these data are not stored again if they are reset.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semiconductor memory device. In particular, the present invention relates to data saving/restoring means for saving data stored in a memory in a semiconductor storage device to a magnetic disk device, and restoring data saved in the magnetic disk device to the memory.

〔overview〕

The present invention is a storage means using a volatile semiconductor memory element, in which data stored therein is temporarily saved to a non-volatile magnetic storage means, and this data is restored to the storage means using a semiconductor memory element. By prohibiting the restoring of data when the evacuation operation is interrupted due to a failure or other reason in a storage device that may be stored and used, incorrect data may be restored in the storage means using a semiconductor storage element. This is designed to prevent this from happening.

[Conventional technology]

2. Description of the Related Art In recent years, the performance of semiconductor memory elements has improved significantly and their prices have decreased significantly, and semiconductor memory devices using semiconductor memory elements have come to be used as high-performance external memory devices.

Semiconductor storage devices do not involve mechanical operations like magnetic disk devices, so access time is greatly reduced, contributing to improved performance of computer systems. However, since the memory of semiconductor storage devices is volatile, a magnetic disk drive is built into the semiconductor storage device, and the data in the memory is saved to the magnetic disk drive before the power to the computer system is turned off. The data that was saved to the magnetic disk drive when the machine was turned on is being re-stored in memory.

[Problem that the invention seeks to solve]

A problem with such conventional devices is that if a failure occurs when saving data in memory to a magnetic disk device and the data cannot be saved normally, the data saved to the magnetic disk device will be lost. If the data is re-stored in memory as it is, there is a drawback that incorrect data will be re-stored in memory as-is.

The present invention aims to eliminate such drawbacks, and aims to provide a storage device in which only data that has been correctly stored in the magnetic storage device can be re-stored in the memory.

[Means for solving problems]

The present invention includes a first storage means using a semiconductor element, a second storage means using a magnetic storage medium, saving data from the first storage means to the second storage means, and the second storage means. and a control means for re-storing data evacuated to the first storage means into the first storage means, the storage device comprising an instruction means for setting instruction information when the evacuation is successfully executed, The control means is characterized by comprising inspection means for executing the re-storage based on the setting state of the instruction information.

[Effect]

For example, when a computer system is powered off, the contents of a volatile semiconductor memory are evacuated to a non-volatile magnetic disk, and when the storage bag surface is used, the contents of the magnetic disk are stored again in the semiconductor memory. .

Now, in the present invention, when the contents of the semiconductor memory are normally saved to the magnetic storage device, the instruction information provided in the storage area of the magnetic storage device is sent.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A device according to an embodiment of the present invention will be explained below based on the drawings.

The figure is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention.

First, the configuration of this embodiment device will be explained based on the drawings.

This embodiment device includes a memory 2, a data evacuation/storage control circuit 3, and a magnetic disk device 4 including a data evacuation instruction section 5. Connected to send and receive signals.

Next, the operation of this embodiment device will be explained based on the drawings.

The data evacuation/storage control circuit 3 resets the data evacuation instruction section 5 before evacuation of the data stored in the memory 2 to the magnetic disk device 4, and then performs data evacuation to ensure that the data evacuation is normal. When the process is completed, the data save instruction unit 5 is set.

If some failure occurs during data saving and the data saving operation is interrupted, the data saving instruction section 5 remains in the reset state.

The data evacuation/storage control circuit 3 checks the data evacuation instruction section 5 when restoring the data evacuation to the magnetic disk device 4 to the memory 2, and if the data evacuation instruction section 5 is set, it restores the data. and if it has been reset, the data will not be stored again.

〔Effect of the invention〕

As explained above, the present invention provides a data evacuation instruction section in the storage area of a magnetic disk device, and when restoring data evacuated to the magnetic disk device into memory, the data evacuation instruction section is inspected and reset. If it is, the re-storage to the memory is not performed, which has the effect of not re-storing the incorrect data to the memory as is.

[Brief explanation of drawings]

The figure is a block configuration diagram showing the configuration of an apparatus according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Semiconductor storage device, 2... Memory, 3... Data evacuation/storage control circuit, 4... Magnetic disk mounting surface,
5...Data evacuation instruction section.

Claims (1)

[Claims] (1) a first storage means using a semiconductor element, a second storage means using a magnetic storage medium, saving data from the first storage means to the second storage means, and the second storage means control means for re-storing the data evacuated to the first storage means; further comprising an instruction means for setting instruction information when the evacuation is successfully executed; A storage device characterized in that the means includes: inspection means for executing the re-storage based on the setting state of the instruction information.