JPS6051944A - Data transfer device - Google Patents

Abstract

PURPOSE:To prevent an imitation and a fraudulent use by executing a data conversion at the stage of a data transfer between a processing device and a storage device of a microcomputer. CONSTITUTION:An instruction code which is read out of a control ROM1 and transferred to a microprocessor 2, or an address data to the control ROM1 from the microprocessor 2 is converted in accordance with a converting rule determined in advance, and thereafter, transferred. Also, plural converting rules of a transfer data are determined so that the converting rule is switched at every specified data. Accordingly, even if the instruction code of the control ROM1 is checked, a software is not known, and also, even if the control ROM is copied, the same control operation is not executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a data transfer device in a micro combicoater, and particularly to data transfer between a control ROM storing instruction codes such as programs and a microprocessor. The present invention relates to a data transfer device to be used.

-2- (Prior art) In the conventional microprocessor, the instruction code stored in the control ROM is read out using the address code from the microprocessor, and the processing according to the read instruction is executed by the microprocessor. running on the processor.

However, with conventional microcombi coaters, in order to increase versatility, the manufacturer publishes a large number of handling materials at the same time as the microcomputer, and the microcomputer has the following instructions: In addition, when the command code is read from the control ROM, it is clearly known whether the microphone [1 processor] operates in the same way as the command code, and the device controlled by the microcombicoater can be set up. Tears were extremely convenient to produce.

However, in the well-known microcomputer-controlled Tl device, much effort and cost is spent developing the software stored in the control ROM, but it is difficult to check the instruction code of the control ROM. This makes it easy to understand the software, and it is also possible to create a device with the same circuit configuration and the same control operation by simply copying the control tll ROM without having to develop software. - (Objective of the Invention) The present invention has been made in view of such conventional problems, and is aimed at improving the connection between the processing device and the storage device of the micro combi coater. By performing data conversion at the data transfer stage, the software cannot be easily identified even if the instruction code of the control ROM is examined, and furthermore, the same control 11 operation is not performed even if the control ROM is copied.Data Transfer 5LII
F? The purpose is to provide

(Structure and Effect of the Invention) In order to achieve this object, the present invention provides an instruction code read from the storage device or an address code for the storage device that is transferred between the storage device and the processing device. , when the data is converted into another data format according to predetermined conversion rules at the data transfer stage, and the conversion rules for data conversion are applied to multiple tlfm, specific transfer input data or specific conversion data is obtained. Switch and select the conversion rules sequentially.
I cannot tell what kind of control operation the microprocessor is doing even if I look at the ROM instructions, and even if I copy the control ROM, I cannot perform the same control operation to the microprocessor if I leave it as is. This is to prevent decoding and copying and plagiarism of the software.

(Embodiment) FIG. 1 is a circuit block diagram showing an embodiment of the present invention.

First, to explain the configuration, 1 is based on the software. A control ROM that stores a series of instruction codes.

Reference numeral 2 denotes a microprocessor that executes a process according to a read request to the control ROM 1, that is, an instruction code read out by addressing by sending address data.

A data transfer device 3 of the present invention is provided on a line for data transfer of instruction codes from the control ROM 1 to the microprocessor 2.

The data transfer device @3 has a selector switch SW1. A plurality of converters 4a, 4b provided with SW2 on the input/output side.

. . 4n, and each of the converters 48 to 4n has a conversion table 1.2. . . . n are provided, and each of the conversion tables 1 to n is a conversion table that follows a different conversion rule.

In addition, the output signal is converted by one of the converters 4a to 4n taken out via the output side changeover switch SW2, and is input to the input command load 131 and input to the converter 5. Determine decoder 5 (L predetermined specific conversion)-de, switch conversion table 1-〇 according to a predetermined order, and send the selected decoder output to switch selection circuit 6;
By operating the changeover switches SW1 and SW2 by the switch selection circuit 6, data input/output for the transformers 4a-4,n is switched.

Next, the relationship between the microphone [commands used in one processor 2] and the command codes stored in the iROM 1 when the data transfer bag M3 shown in the embodiment shown in FIG. 1 is used will be explained.

First of all, control program [1 gram is created by microbe [II? Tsu1
If the control program is created using the instruction-1 code used in t°2, and the control program is created in this way, all
When writing a program to ROM using a ROM writer, select one of the conversion tables 1 to 48 to 4n provided in the data transfer head 3, and write the reverse of the selected conversion rule. For conversion -7- The instruction code of the microprocessor 2 is converted according to the rule and written to the control ROM 1. When writing the instruction code to the control ROM 1 by converting the instruction code,
Instead of using the same conversion table, for example, the conversion table is sequentially switched to conversion tables 1 to 0 every predetermined number of program steps, and the instruction code converted by the reverse conversion rule of the changed conversion rule is stored in the control ROM. write to. Switching the conversion rule every predetermined number of program steps is a method for data transfer between three stations.
The conversion table switching rule is set in advance when the converted instruction code is written to the control ROM 1 in the decoder 5. . Of course, the switching of the conversion tables 1-n is not limited to switching depending on the number of program steps; for example, the conversion rules may be sequentially switched every time a specific instruction code is digitized.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

-8- Microphone[]bn+: Control TI'<OM in response to a read request from tree 2, that is, address data designation.
1 outputs the instruction code stored at the request address to the data transfer device 3. At this time, as shown in the figure, the data transfer switch SW1.
The instruction code from ROM 1 is set in the converter 4a.
The command is converted into an instruction executable by the microprocessor 2 according to the conversion rules shown in ζ conversion table 1, and is transferred and output to the microprocessor 2.

Similarly, the instruction code from the control ROM is converted by the converter 4a and transferred to the microprocessor 2 according to the address data of the microb [1 set (J2J).Meanwhile, this converted instruction code μde] The decoder 5t determines whether a specific instruction:]-de is obtained and determines a specific instruction code.
Switch selection -9 = generates decoder output in circuit 6, selector switch SW1, S
Switch W2 to input/output of converter 4b, then control tll
The instruction code from the ROM 1 is converted into an instruction code executable by the microprocessor 2 according to the conversion rules of conversion table 2 provided in the converter 4b, and is transferred and output.

Thereafter, similarly, every time a conversion output of a specific instruction code is obtained, the decoder 5 and the switch selection circuit 6 select the changeover switch SW1. By switching SW2, converters 48 to 4n are sequentially switched, and the instruction code converted according to the conversion rule y, H<' is transferred to the microphone processor 2 and output.

According to the embodiment shown in FIG. 1, even if the instruction code in the control ROM 1 is checked, this instruction code is
Since the software does not correspond to the instruction code used in Since the conversion rule is not known, the control R' OM 1
It is impossible to perform the same control with the instruction code of (
Not.

It should be noted that the data transfer device 3 shown in FIG. SW2. Converters 4a-4. n, 7' coda 5
Dedicated IC equipped with OJ: and switch selection circuit 6
Package.

FIG. 2 is a circuit block diagram of another embodiment of the present invention, in which the decoder 5 is used to change the conversion tables 1 to 11 in this embodiment (gQt to non-converters 4a to 4n). It is characterized in that the input is a specific instruction code read from the control ROMI, and in terms of layout, the output of the control ROM1 is directly connected to the decoder 5, and a predetermined control ROMIJ: Rino [specific command]-, the switch selection circuit 6 selects the selector switch SW1. SW
2 is switched, and inputs and outputs of transformers 4a to 4n having conversion tables 1 to n according to different conversion rules are sequentially switched and selected.

The other circuit configurations are the same as those in the embodiment shown in FIG. 1, and the operation is also the same as in the embodiment shown in FIG. 1, except for the function of the decoder 5.

FIG. 3 is a circuit block diagram showing another embodiment of the present invention, and this embodiment is controlled by the microprocessor 2.
It is characterized in that a read request to the ROM 1, that is, address data, is converted by the data transfer device 3.

That is, the data transfer device 3 of the present invention is provided on the address data line from the microprocessor 2 to the control ROM 1, and the data transfer device 3 has a changeover switch SW1.8W.
2. It is made as a dedicated IC package including a converter 4a-/In, a decoder 5 and a switch selection circuit 6.

Here, as the conversion tables 1 to n according to the various conversion rules provided for each of the converters 48 to 4n, the address data outputted from the micro brochure 12 to 2J according to the program steps is converted to the conversion table 1. ~n
After converting according to one of the converters t111, a read request is made to the control ROM 1, and similarly to the embodiment shown in FIG. Convert the write address specification when writing with a ROM writer 8! ! i/
Inverse transformation 1 of the conversion rule by selecting one of Ia to 4n
(1! All you have to do is convert it to completely free address data according to Regulation 1111 and write the instruction code to the converted address.Of course, the switching judgment of conversion tables 1 to n is specified from Microb "] Setza 2) By setting this specific address data in the decoder 5, the converters /Ia to 4n can be sequentially selected and switched by determining the specific address data by the decoder 5. , the instruction code stored in the control ROM 1 remains the same as the instruction used by the microprocessor 2 = 1
- It is de. According to the embodiment shown in FIG. 3, the address data from the microprocessor 2 is transferred to the converters 48 to 4 determined by the switching position of the changeover switch SW1.8W2 by the switch selection circuit 6 based on the output of the decoder 5.
Converted by the conversion table set in any one of n and controlled by
The instruction code is supplied to the ROM 1 as address data, and the instruction code stored in the converted address is read out and executed by the microprocessor 2.

Therefore, by examining the instruction code of the control ROM1, we found that the instruction code is not stored in the order of program steps as in a normal control ROM, but is stored at a random address according to the conversion rule. cannot be investigated. of course,
Even if control ROM 1 is copied, the address specification procedure according to the conversion rules is unknown, so the instruction code of control ROM 1 as it is is written as "J:" and "microphone[1p"]seri2.
It is impossible to run a control program with

-14- In addition, in any of the embodiments shown in FIGS. 1 to 3, the -b1 program is executed 1! However, if you examine the instruction code input to the microphone [1) block 2, you will find that the progera l\ generally has a branch point such as a discrimination block, so the branch side is known, and the branch 1) 4r part remains unknown. , progera l
＼ cannot be completely reproduced.

(Effect of the invention Song Dynasty) J: Sea urchin described below in 1-1 According to the present invention, the control R
Instruction code read from OM and transferred to microprocessor, or control RO from microprocessor
The address data for M is converted according to a predetermined conversion rule, and then transferred, and one transfer is made to the converter I11
Since a plurality of λ are defined and the conversion rules are switched to specific data fO,
Even if I examine M, I cannot understand the software at all because it stores a converted instruction code that is different from the instruction code that is executed in one step.On the other hand, regarding address data conversion, there are no conversion rules. Since the instruction code is stored at a random address according to
Even if you examine the instruction code, you will not be able to understand the rough 1 to software at all, and furthermore, even if you copy the control ROM as it is, you will not be able to execute the same control.

Furthermore, even if we examine the human power of the instruction code for the microprocessor that has been converted to the transfer device U, since general programs have branch points as decision blocks, One side is known, but the remaining side that did not branch remains unknown, and as a result, the program cannot be completely reproduced.11- Reliably prevents imitation and theft of devices using micro combi coater control. be able to.

[Brief explanation of the drawing]

FIG. 1 shows a circuit block showing an embodiment of the present invention.
6-2 and 2.3 are circuit block diagrams showing other embodiments of the present invention. 1: Control ROM 2: Microprocessor 3: Data transfer device /la-/In: Converter 5: Decoder 6: Switch selection circuit SWl, 8W2: Changeover switch Patent applicant Corporation? iTokyo Keiki Agent Patent Attorney Susumu Takeuchi-17-

Claims (4)

[Claims] (1) In a data transfer device that transfers data between a storage device and a processing device that processes data stored in the storage device, the data conversion means includes a plurality of predetermined conversion rules; selection means for sequentially selecting the plurality of conversion rules based on specific input data to the data conversion means or specific conversion data; and data input/output to any one conversion rule of the conversion means selected by the selection means. 1. A data transfer device comprising: switching means for switching and outputting converted data according to the conversion rule. (2) The converting means converts the data retrieved from the storage device in response to a data read request from the processing device according to a selected conversion rule. The data transfer device according to item 1. (3) The data transfer device according to claim 1, wherein the conversion means converts a data read request from the processing device to the storage device according to a selected conversion rule. (4) The data transfer device according to claim 1, wherein each of the converting means, selecting means, and switching means is housed in a single IC package.