JPS61187037A - Read data converting system - Google Patents

Abstract

PURPOSE:To protect data by providing a circuit, which converts data read out from a memory, between the memory and a central processing unit. CONSTITUTION:Data is preliminarily stored in a memory 11, and this data is read out to a central processing unit (CPU)13 through a data converting circuit 12. Read data is processing by the CPU13, and data of contents to be displayed is sent to a solid-state display device 17 through a bus 14, an output interface 15, and a driving circuit 16 and is displayed. Since data read out from the memory 11 is converted by the data converting circuit 12 and is read into the CPU13 in this manner, the use of data in the memory which is copied without permission is ineffective even if data in the memory which is copied without permission is used in another microcomputer system, thus protecting data stored in the memory.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a read data conversion method, and in particular, to a read data conversion method that allows a user to freely convert read data from a memory used in a solid-state display device or the like. This invention relates to a read data conversion method.

[Conventional technology]

Recently, control systems using microcomputers have been introduced into various fields, and are playing a role in labor saving and automation. In this microcombinator, a central processing unit (CPU) processes data using data stored in advance in a memory, and the processed data is sent to various devices via an input/output interface. Further, the data input from the input device is read into the CPU via the input interface and is similarly processed. FIG. 4 shows advertisements, necessities,
In Figure 0, which is a schematic configuration diagram of a control system for a solid-state display device that displays electronic messages, etc., l is a memory, 2 is a CPU, 3 is a bus, 4 is an output interface, 5 is a drive circuit, and 6 is a solid-state display device. , 7 is a human output interface, 8 is an input device, and 9 is a display.

In FIG. 4, data previously stored in a memory 1 is processed by a CPU 2, and display data is sent to an output interface 4 via a bus 3. The display data output from this output interface 4 is sent to the solid-state display device via the drive circuit 5! Displayed by 6. In addition, when editing data, editing can be performed by inputting data from the input device 8.
The editing status can be monitored on the display 9.

[Problem that the invention seeks to solve]

In a solid-state display device using such a microcomputer, data stored in the memory 1 is read into the CPU 2 and displayed on the solid-state display device 6, but the data stored in the memory 1 is modified by each user. The website is created with the aim of achieving effective and excellent display effects for publicity, advertisements, direct marketing, etc. In other words, the effort and cost required to create software are increasing. However, although the data created after requiring a great deal of effort and expense is stored in the memory 1, it can be easily copied, and if there is copied data, it can be incorporated into another microcomputer system. There was a problem in that the data could be easily diverted without permission. Especially now, "Hanten" is used to enhance the display effect.
Special effect modes such as ``Tenmetsu'' and ``Spot'' allow you to perform various light actions on the displayed characters, create logotypes and marks for characters that cannot be found on the keyboard, and draw illustrations and display animations. Since data can be created by making full use of a wide variety of special effects, it is important to protect that data.

Despite this, there was a problem that the protection was insufficient.

In order to solve this problem, the present invention provides a memory that stores data and a CPU that reads and processes this data.
A data conversion circuit that can convert data is provided between the
By having the CPU process the converted data, even if the memory copied without permission is used in another microcomputer system, the use will be invalidated, and the data stored in the memory can be protected. The agreement is to provide a read data conversion circuit.

[Means for solving problems]

To this end, the read data conversion method of the present invention is a read data conversion method for a data processing system equipped with a memory, a central processing unit, and an input/output device, in which data read from the memory is provided between the memory and the central processing unit. The present invention is characterized in that it is provided with a data conversion circuit capable of converting .

(Function) In the read data conversion method of the present invention, the data read into the central processing unit is not the data read from the memory as is, but the data converted through the data conversion circuit. Therefore, if data stored in memory is read into the central processing unit without passing through the data conversion circuit, it becomes data that the central processing unit cannot process. can be protected from being diverted to other systems.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic block diagram of the read data conversion method of the present invention, FIG. 2 is a circuit diagram of the main parts of the read data conversion method, and FIG. 3 is an explanatory diagram of the main parts of the read data conversion method showing another embodiment. In the figure, 11 is a memory, 12 is a data conversion circuit, for example, a programmable logic array.
(PLA), 12-1 is AND array, 12-2 is O
R array, 13 is a CPU, 14 is a bus, 15 is an output interface, 16 is a drive circuit, 17 is a solid state display device,
18 is an input/output interface, 19 is an input device, 20
is a display.

In FIG. 1, data is stored in a memory 11 in advance, and the data is transferred to a CP via a data conversion circuit 12.
It is read out by U13. The read data is CP
Processed in U13, the display content data is sent via bus 14 to output interface I5 and drive circuit 16 to solid state display device 17, where it is displayed.

The data read out from the memory 11 in this way is converted by the data conversion circuit 12 and sent to the CPU
It will be loaded into 3.

This point will be explained in more detail using FIG.

Here, the memory 11 includes the selection circuit 11-1 and the block 11.
-2, etc., and when an address signal expressed in binary notation is added from the CPU 13 via the address bus, the address specified by that address is selected.
When a control signal R is applied from block 3 through the control bus, the contents of the word at the address of block 11-2 are read out to the data bus. The read data is sent to the data conversion circuit 12. This data conversion circuit 12 is composed of an AND array 12-1 and an OR array 12-2.
Programmable Logic Array)
The devices and wiring are also prepared in advance, and logic can be written by programming the programming points. In other words, the upper and lower two-layer matrix-like wiring is fixed, and the necessary customization is performed by activating or not activating the interconnection parts.Here, the F PLA is used where the user can easily write logic in the field as necessary. (Field Program
e Logic Arra) can be used. Logic writing methods include, for example, the fuse blowing type and the junction breaking type, but any of these may be used.
P A L consisting of D array and fixed OR array
(Programmable Array Logic
).

By using the data conversion circuit 12 configured in this way, the data read from the memory 11 is converted on the user side and read into the CPUI 3, and then
Processed in The data outputted from the CPU 13 via the bus 14 is displayed on the solid state display device 17 via the output interface 15 and the drive circuit 16.

In organizing and editing display data, the input/output interface 18 receives data from the input device 19.
is read into the CPU 13 via the bus 14, and the CPU 13
The data is organized and edited in the process. The output data is then displayed on the solid state display device 17 via the bus 14, output interface 15, and drive circuit 16.

Note that data input from the input device 19 can be monitored using the display 20.

Next, another embodiment of the present invention will be described based on FIG.

In this example, the PL that constitutes the data conversion circuit 12 is
A plurality of sets of PLAs A are prepared, and an analog switch is turned on and off depending on the content of a specific bit of an address signal, so that one of these PLAs can be arbitrarily selected.

With this configuration, a wide variety of data conversions can be performed. In other words, the correspondence between the data output from the memory 11 and the data read into the CPU 13 can be converted in a wide variety of ways, and the memory 11 can be used effectively only in the microcomputer system. . In other words, this data conversion circuit is a special t of this microcomputer system.
Can function as a child key.

Other points are the same as those described above, so explanations will be omitted.

Note that the present invention is not limited to the embodiments described above, and various modifications can be made in accordance with the spirit of the present invention, and these are not excluded from the scope of the present invention.

[Effects of the Invention] As is clear from the above description, according to the present invention, in the read data conversion method of the present invention, a data conversion circuit capable of converting data read from the memory is provided between the memory and the central processing unit. By providing this, it is possible to effectively protect data that has been created with great effort and expense and is stored in the memory.

Furthermore, in addition to the addition of the data conversion circuit in the present invention, the microcomputer system can be customized so that it can be used only by a specific user. Moreover, the circuit configuration for this purpose is simple, and the effects brought about by the present invention are great.

[Brief explanation of drawings]

FIG. 1 is a schematic block diagram of the read data conversion method of the present invention, FIG. 2 is a circuit diagram of the main parts of the read data conversion method, and FIG. 3 is an explanatory diagram of the main parts of the read data conversion method showing another embodiment. , FIG. 4 is a schematic diagram of a control system using a conventional microcomputer. 11...Memory, 12...Data conversion circuit, 12-
1...AND array, 12-2...OR array, 1
3... CPU, 14... Bus, 15... Output interface, 16... Drive circuit, 17... Solid state display device, 18... Input/output interface, 19...
- Input device, 20... display. Figure 1 Figure 2

Claims (1)

[Claims] (1) A read data conversion method for a data processing system including a memory, a central processing unit, and an input/output device, comprising:
A read data conversion method characterized in that a data conversion circuit capable of converting data read from the memory is provided between the memory and the central processing unit. (3) The read data conversion method according to claim 1, wherein the data conversion circuit has a plurality of conversion logics and switches the conversion logic depending on the content of a specific bit of the read address signal. (2) The read data conversion method according to claim 1, wherein the data conversion circuit is capable of selecting a logic array.