JPH0555263U - IC memory card - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an IC memory card that can be prevented from being used by anyone other than the person who has the right to use it. [Configuration] 1 is an IC memory card, 2 is a memory, 3 is an I
/ F connector, 4 is a selection circuit, 5 is a selection switch, 6 is a fuse, 7 is a rotary push switch, 8 is a combination signal, and 9 is a memory control signal. A specific fuse 6 is selected by switching the rotary push switch 7 of the selection circuit 4, and a combination signal 8 is obtained by combining the signals of the selection circuits 4. This signal 8
Are stored in the memory 2. When used by another person, if a combination signal that does not match the combination signal 8 is input, reading / writing from / to the memory 2 is prohibited.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an IC memory card, and more particularly to a memory data protection function.

[0002]

[Prior Art]

 Conventionally, when protecting the data recorded in an IC memory card, a protection attribute is given to the data unit and the entire memory by software, or an external switch is provided, and the memory is protected by switching the switch.

[0003]

[Problems to be solved by the device]

 In the conventional method, since the attribute of protection was given by software, the attribute was erased by rewriting the software. Also, since it is an external switch, it could be easily used by anyone other than the person who has the right to use it.

Therefore, it is an object of the present invention to provide an IC memory card that can be prevented from being used by anyone other than the person who has the right to use it.

[0005]

[Means for Solving the Problems]

 Therefore, in order to achieve the above-mentioned object, the present invention has a memory for storing data and a combination circuit for prohibiting reading and writing to the memory, and the combination circuit is arbitrarily determined by a user, The configuration is such that the read / write control input signal can be controlled by the specified combination.

[0006]

【Example】

 FIG. 2 shows an embodiment of the present invention, in which 1 is an IC memory card, 2 is a memory, 3 is an I / F connector, 4 is a selection circuit, 5 is a selection switch, 6 is a fuse, and 7 is a rotary push. A switch, 8 is a combination signal, and 9 is a memory control signal. 3 and 4 are detailed diagrams of the selection circuit 4. Further, FIG. 1 shows an outline view of the present invention.

In FIG. 1, the fuse 6 in the selection circuit 4 is initially in an unbroken state, and all the combination signals 8 of the four selection circuits 4 and the memory control from the I / F connector 3 with the host are performed. The signal 9 and the signal 9 are applied to the memory 2 as a selection signal. Further, all other signals supplied to the memory 2 are supplied from the I / F connector 3. 3 and 4 show the selection circuit 4 described above. The operation of the selection circuit 4 will be clarified with reference to FIGS. The rotary push switch 7 is used to set any position (other than "-"), and the select switch 5 is used to sequentially blow the fuses 6 except for one position which is desired to be used as the combined signal 8 of the rotary push switch 7. For example, when it is desired to use the position "1" of the rotary push switch 7 as the combination signal 8, it becomes as shown in FIG. In this way, the same operation as above is performed for the other three selection circuits 4 in FIG. Create a combined signal 8. The combination signal 8 is added to the memory control signal 9 sent from the host, the output is given to the memory 2, and reading and writing of the memory 2 are permitted.

When the position other than the combination signal 8 is set, the combination signal 8 is always “1”, and therefore reading and writing to the memory 2 is prohibited.

[0009]

[Effect of the device]

 As described above, according to the present invention, unless the combination signal 8 generated by the plurality of selection circuits is met, reading / writing from / to the memory is prohibited, and it is possible to prevent use by anyone other than the person who has the right to use the memory. it can.

[Brief description of drawings]

FIG. 1 is an external view showing an embodiment of the present invention.

FIG. 2 is a block diagram.

FIG. 3 is a detailed diagram of a selection circuit.

FIG. 4 is a detailed diagram of a selection circuit.

[Explanation of symbols] 1 IC memory card 2 Memory 3 I / F connector 4 Selection circuit 5 Selection SW 6 Fuse 7 Rotary push SW 8 Combination signal 9 Memory control signal

Claims (1)

[Scope of utility model registration request] 1. An IC memory card, comprising: a memory for storing data; and a combinational circuit for prohibiting reading and writing to the memory.