JPS5847598Y2 - Storage data protection device - Google Patents

Description

[Detailed description of the invention] The present invention is a device for protecting the storage contents (stored data) of a storage device, in particular, to prevent the storage contents of the storage device from being changed by accidentally pressing an operation button, etc. The present invention relates to a storage data protection device that blocks power supply to systems other than the system and blocks data writing to a storage device.

In general, there are devices that protect data by detecting voltage drops in power supply voltage as storage data protection devices.

In this case, the parts used must have a wide allowable operating range; for example, a part that only has an allowable operating range of 5v±10% will only work at 4.5v to 5.5cm.

Therefore, in order to ensure reliable protection even in a narrow allowable operating range, the components used in the voltage drop detection section of the power supply voltage must have very good variations, temperature characteristics, etc. , which had the disadvantage of being extremely expensive.

Furthermore, in order to prevent the above-mentioned drawbacks, there are some devices that use two switches to protect stored data.

In this case, when protecting the stored data, it is achieved by turning on a switch for protecting the data so that no data can be written to the storage device, and then turning on a switch that cuts off the power to everything other than the storage system.

However, there are two types of switches to protect the stored data, and if the operating procedure is mistaken, the stored data may be changed.

The present invention provides a storage data protection device that solves these conventional problems.

Hereinafter, embodiments of the present invention (Q) will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a peripheral device, which performs processing for writing data into the storage device 2 and processing for reading recorded pupil data from the storage device 2.

2 is a storage device that stores 0 data from the peripheral device 1;

A data protection switch 3 protects the data stored in the storage device 2.

4 is a power supply section. The operation from the data protection state to the data protection release state in the above configuration will be explained.

In the data protection state, switch a of data protection switch 3
The common terminal C is connected to the NC side and blocks power supply from the power supply section 4 to the peripheral device 1.

Further, the common terminal C of the switch b is also connected to the NC side, and applies a low level (GND level) to the storage device 2 to prevent write of take 0 to the storage device 2.

First, switch a is activated (the common terminal C is connected to the NO side) to supply power to the peripheral device 1.

After power is supplied to the peripheral device 1, switch b is activated (common terminal C is connected to the NO side), a bi level (+V level) is applied to the storage device 2 from the common terminal C of the switch b, and the voltage is applied to the storage device 2. The data write process from the peripheral device 1 is enabled and the data protection is released.

Next, the operation from the data protection release state to the data protection state will be explained.

In a state where power is being supplied to the peripheral device 1 and data can be written from the peripheral device 1 to the storage device 2, switch b is first activated (the common terminal is connected to the NC side).

When switch b is activated, the common terminal C of switch b
A low level (GND level) is applied to the storage device 2 from then on, blocking data writing from the peripheral device 1 to the storage device 2 and putting the stored data in the storage device 2 in a protected state.

Activate switch a after the stored data is protected (
Connect the common terminal C to the NC side).

When the switch a is activated, power supply to the peripheral device 1 is blocked and the data protection state is entered.

Protection of data stored in the storage device 2 will be explained based on FIGS. 2 and 3.

In FIG. 2, 5 is a storage unit, which is usually composed of a random access memory IJ (RAM) or the like.

6 is an AND gate that performs logical product.

Here, the storage unit 5 enters a write state when a bi level (+■) is applied to the read/write manual R/W, and enters a read state when a low level (GND) is applied.

Assuming that the data is now in the data protection state, the common terminal C of switch b is connected to the NC side as described above, so that a low level is output from the output of the AND Gatero.

When the output of the AND gate 6 is low level, the storage unit 5
A low level is applied to the read/write manual R/W, and the storage section 5 is forcibly put into the read state to protect the data stored in the storage section 5.

Also, assuming that the data protection is released, the common terminal C of switch b is connected to the NO side as described above,
Bi level is applied to AND gate 6.

Therefore, the output of the AND gate 6 is influenced by the signal from the peripheral device 1 as an extraction input, and the write and read states of the storage section 5 are controlled.

In FIG. 3, data is not protected by using read/write manual R/W, but by using chip enable manual CE.

When the chip enable input CE is at a low level, the peripheral device 1 to the storage device 2 (such as one configured with RAM)
Even if a stop signal is applied to the human read/write R/W, the storage device 2 is forcibly put into the read state regardless of the signal, and the data stored in the storage device 2 is protected.

When a by level is applied to the chip enable input CE, each read/write state is controlled depending on the signal from the peripheral device 1.

FIG. 4 shows an example of the data protection switch 3.

This data protection switch 3 is in the first position X1 in the rotational direction.
Switch a that takes (OFF) and second position X2 (ON)
and a second position X2 in the rotational direction and a first position X1 in the axial direction.
(OFF) and a switch b that takes the first position X1 (ON), X1 → X2 (¥1) → Y2 →
It is associated with one operation knob 7 so as to perform a regular operation of Y1(X2)→X.

First, when the operating knob 7 is rotated from the X position to the X2 position, the common terminal C of the switch a is switched from the NC side to the NO side, and power is supplied to the peripheral device 1.

Next, when the operating knob 7 is moved from the second rotation position X2 (yt) in the axial direction to the 20 position from Yl,
Switch a keeps the common terminal C connected to the NO side, and switch b changes the common terminal C from the NC side to the N side.
It switches to the O side, and the data protection is released.

Then, the operation knob 7 is moved in the axial direction from ¥2 to yt (xt
), the common terminal C of switch b is switched to the NC side, but the common terminal of switch a remains connected to the NO side.

Next, move the operating knob 7 to the first axial position yt (X2)
When the switch a moves from the X2 to the X10) position in the rotational direction, the common terminal C of the switch a switches from the NO side to the NC side, and enters the data protection state.

In the example shown in Fig. 4, switches a and b are switched by rotating the operating knob and pulling it in the axial direction, but in this case, switches a, r, and b are switched by sliding in two orthogonal directions. Alternatively, the switches a and b may be switched by rotation and compression in the axial direction.

As described above, according to the present invention, a data protection switch is constituted by a first switch that supplies power to a peripheral device and a second switch that sends a blocking signal to a data write blocking section of a storage device. (10) when changing the storage device from a data protection state to a data protection release state, the first switch is operated prior to the second switch; and when changing the storage device from a data protection release state to a data protection state, the first switch is operated;
A second switch is operated before the switch, and the data protection switch is operated by a single operation knob that is oriented and can be operated in different ways, thereby protecting data stored in the storage device. In this state, even if an operation switch related to a peripheral device is operated by mistake, the data stored in the storage device will not be destroyed.

Furthermore, the first switch is a so-called standby switch, and when it is turned on,
The second switch can be used to start up the storage device, and the first switch can be used to turn off the power to peripheral devices, achieving extremely important operational conditions. Since the operation is given priority to the user, it is possible to provide an excellent storage data protection device that achieves both operability and security of storage protection.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of the main parts thereof, and FIG. 4 is a diagram showing the operation procedure of the data protection switch. 1...Peripheral device, 2...Storage device, 3
...Data protection switch, 4...Power supply, 5...Storage section, 7...Operation knob.

Claims (1)

[Scope of utility model registration request] a storage device, a peripheral device that performs data write processing to the storage device and data read processing from the storage device, a data write blocking unit that blocks data write processing of the storage device, and a power supply to the peripheral device. and a second switch that sends a blocking signal to the data write blocking unit, and the data protection switch is configured to release the data protection from the data protection state of the storage device. When changing the storage device from the data protection release state to the data protection state, the second switch is operated before the first switch. What is claimed is: 1. A storage data protection device, characterized in that the storage data protection device is configured to be operated by a single operating knob that is oriented and capable of different types of operations.