JPH0574135A - Memory card - Google Patents

Abstract

PURPOSE:To prevent arbitrary use of data in a memory card by comparing an ID code stored in a storage circuit for an external ID code with the one stored in a storage circuit inside the memory card and by making the card accesible only when they coincide with each other. CONSTITUTION:An ID code inputted from outside through an interface element 1 is written in a storage circuit 2 for the external ID code. The input ID code is compared in a comparison circuit 4 with an ID code stored in a storage circuit 3 for the ID code inside a memory card 1. When they coincide with each other, a signal line 5 for outputting the result of comparison is made active and thereby execution of an access to data in the card 1 is enabled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory card having a semiconductor memory device.

[0002]

2. Description of the Related Art Conventionally, a memory card has always been able to access data by an address signal and a control signal.

[0003]

In the conventional memory card, there is a problem that software and data in the memory card are arbitrarily used because data can be accessed by an address signal and a control signal.

[0004]

Means for Solving the Problem I written from the outside
It has a storage circuit for storing the D code, a storage circuit for storing the ID code inside the memory card, a comparison circuit for comparing the two ID codes, and a signal line for outputting the comparison result.

[0005]

[Function] The ID code stored in the storage circuit storing the ID code written from the outside and the ID stored in the storage circuit storing the ID code inside the memory card.
The code is compared with the comparison circuit, and the signal line for outputting the comparison result is activated only when the two ID codes match, and the memory card becomes accessible.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention, in which 1 is an interface section, 2 is a memory circuit for storing an ID code written from the outside, and 3 is a memory for storing the ID code inside a memory card. Reference numeral 4 is a comparison circuit, and 5 is a signal line for outputting a comparison result. ID code is written from the outside through the interface I
The D-code is written in a memory circuit, and the written ID code and the ID code stored in the memory circuit for storing the ID code inside the memory card are
The comparison circuit compares the signals, and if they match, the signal line that outputs the comparison result is activated, and the data in the memory card can be accessed. If the ID code stored in the memory card and the ID code written from the outside do not match, the signal line that outputs the comparison result remains inactive, so you can access the data in the memory card. Can not do it.
Unless you know the ID code stored in the memory card, you cannot access the data on the memory card,
The software and data on the memory card cannot be used without permission. That is, the software and data in the memory card can be protected. Also, by assigning different ID codes to the software and the data, the software and the data can be recognized on the main body side, and it is possible to prevent malfunction and access to different data. In this way, by having the ID code on the memory card itself, the software and data can be protected from others and the software and data of the memory card can be recognized.

[0007]

Since the memory card itself has the ID code, there is an effect of protecting the software and the data from being used by the ID code without permission. There is also an effect that the ID code can be used to recognize what the software and data are.

[Brief description of drawings]

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

[Explanation of symbols]

1 Interface 2 Memory circuit for storing ID code written from outside 3 Memory circuit for storing ID code inside memory card 4 Comparison circuit 5 Signal line for outputting comparison result

Claims (1)

[Claims] 1. A storage circuit for storing an ID code written from the outside, a storage circuit for storing the ID code inside a memory card, a comparison circuit for comparing the two ID codes, and a comparison result output. A memory card having a signal line for controlling the memory card.