JP2003030052A - Method and device for memory access - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exclude adverse effects caused by performing a memory operation by an unspecified means. SOLUTION: When a file writing operation to a memory 42 is performed from an operation panel 60, a microcomputer 56 issues three commands such as a Write protect release command, a file write command and a write protect setting command to a controller 40. In addition, when a file deleting operation to the memory 42 is performed, the microcomputer 56 issues three commands such as an erase protect release command, a file deleting command and an erase protect setting command to the controller 40.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a memory access method and device, and more particularly to a memory access method and device for accessing a protected memory.

[0002]

2. Description of the Related Art Conventionally, an MMC (multi media card) (trade name) exists as a removable storage having a controller for controlling access to a memory inside a card. There is management software for managing this MMC with a personal computer or the like, and this management software accumulates the list information of files recorded in the MMC as a database.

Exploration other than management software for MMC
It can be accessed by applications such as er (product name), and files can be written and deleted. However, MMC is protection, read protect
It has protection information such as ion and Erase Protection, and can limit access to the memory.

[0004]

[Problems to be Solved by the Invention] In the prior art, Prot
M with protection of section and Erase Protection
When writing or erasing files on the MC,
It was necessary to cancel the protection each time, and set the protection again after the file was manipulated, which was troublesome.

On the other hand, if protection is not set because setting and releasing of the protect when writing or erasing a file is troublesome, the file is written or recorded in the MMC by an application other than the management software, such as Explorer. There is a risk of deleting the existing file.

When a file is manipulated by Explorer or the like other than the management software, there arises a problem that the database of the management software is inconsistent with the file contents actually recorded in the MMC. In addition, there is a high risk that files may be erased by an erroneous operation with an application other than the management software. Especially if you delete important files such as copyright protection license,
It is determined that the license has not been registered, and the content cannot be played.

Therefore, a main object of the present invention is to provide a memory access method and apparatus which can eliminate the adverse effects caused by memory operation by unspecified means.

[0008]

According to a first aspect of the present invention, there is provided a memory access program for accessing a protected memory, comprising: (a) inputting an access request; and (b) responding to the access request. To release the protection, (c) to perform the access according to the access request after the protection is released in step (b), and (d) to set the protection in the memory after the access in step (c) is completed. Including a memory access program.

A second invention is a memory access device for accessing a protected memory.
An input unit for inputting an access request, a discriminating unit for discriminating an input mode of the access request, a releasing unit for releasing protection based on the discrimination result of the discriminating unit, and an access for performing access according to the access request after the protection is released by the releasing unit Means, and a setting means for setting protection to the memory after the access by the access means is completed, the memory access device.

A third invention is a memory access method for accessing a protected memory.
(A) Step of inputting access request, (b) Step of determining input mode of access request, (c) Step of releasing protection according to the determination result in step (b), (d) Step (c) It is a memory access method including a step of performing access according to an access request after the protection is released, and (e) a step of setting protection on the memory after the access in step (d) is completed.

According to a fourth aspect of the present invention, in a memory access device that stores an identifier and accesses a removable memory that is protected, the input means for inputting an access request and the protection when the identifier is a predetermined identifier are protected. A memory access comprising: a releasing unit for releasing, an access unit for performing an access according to an access request after the protection is released by the releasing unit, and a setting unit for setting a protect on the memory after the access by the access unit is completed. It is a device.

A fifth invention is a memory access program for storing an identifier and accessing a protected memory, wherein (a) an access request is input, and (b) the identifier is a predetermined identifier. A step of releasing the protection at a certain time, (c) a step of performing an access according to an access request after the protection is released in the step (b), and a step of setting the protection in the memory after the access in the step (d) step (c) is completed. It is a memory access program including.

A sixth aspect of the present invention is a memory access method for accessing a plurality of memories that store an identifier and are protected, wherein (a) a step of inputting an access request and (b) a predetermined identifier. If it is an identifier, the step of releasing protection, (c) the step of performing access according to the access request after the protection is released in step (b), and (d) step (c)
The method for accessing a memory includes the step of setting protection on the memory after the access in step 1 is completed.

[0014]

According to the first aspect of the invention, the memory that can be accessed by other programs is accessed such as writing or deleting data. When an access request for writing or deleting data is input, the protection set in the memory according to the access request is released. For example, if the access request is a data write request, the write protect set in the memory is released, and if the access request is a data delete request, the erase protect set in the memory is released. Then, after the protection is released, data is written or deleted from the memory according to the access request. Further, when the access to the memory is completed, the released Write protect or Erase protect is set again in the memory. By doing so, the memory is always protected except when the memory is accessed by the memory access program, and the memory access by programs other than the memory access program is restricted.

In the second and third inventions, the access request to the memory can be input in a plurality of modes, and the access procedure to the memory is made special according to the input mode of the access request. . That is, when the input mode of the access request to the memory is input by operating a specific key, first, the write protect or erase protect set in the memory is released. Then, in accordance with the access request, data is written in or deleted from the memory. When the access to the memory ends, the Write that was released
Set Protect or Erase Protect. In this way, the access operation to the memory is limited to a specific operation means.

In the fourth to sixth inventions, the memory stores the identifier therein, and the access procedure is special for the memory whose identifier is a predetermined identifier. That is, first, it is determined whether the identifier of the memory is, for example, an identifier recorded in a predetermined storage medium. When the identifier is recorded in the recording medium, the write protect or erase protect set in the memory is canceled prior to accessing the memory. Then, access such as writing or deleting data to the memory is executed. Then, after the access is executed, the released Write protect or Erase protect is set in the memory. In this way, access to the particular memory by other access means is restricted.

[0017]

According to the first to third aspects of the invention, the memory is always protected except when the specific memory access means is used to write data to or delete data from the memory. . Then, when data is written to or deleted from the memory by using a specific memory access method, protection is automatically released simply by requesting the access, and when the access to the memory is completed, the protection is automatically performed. Protection is set.

Therefore, it is possible to prevent the contents stored in the memory from being changed by an unspecified memory access means, so that the risk that the data recorded in the memory is deleted by an erroneous operation can be reduced.
Further, by using a specific memory access means, it is possible to access the protected memory such as writing data and deleting data without being aware of the presence of the protected memory.

According to the fourth to sixth aspects of the invention, the protect set in the memory prior to the access to the memory only when the data is written in or deleted from the memory having the specific identifier. Is reset, and protection is set again after the access is completed.

Therefore, the memory is always protected except when data is written or data is deleted by using a specific memory access means.
Since it is possible to select whether or not the protect is set in the memory by the identifier, the flexibility of the protect setting for the memory is widened. The above-mentioned objects, other objects, features and advantages of the present invention will be described below with reference to the drawings. It will become more apparent from the detailed description of the embodiments.

[0021]

[Embodiment 1] Referring to FIG. 1, management software 1 as a memory access program of this embodiment.
6 is stored in a memory 14 included in a personal computer (hereinafter, referred to as “PC”) 10. PC
10 includes a USB (universal serial bus) driver 26 and a USB I / F 28.
The MMC device 12 also including the USB I / F 32 is connected by the SB cable. The MMC 38 is detachably attached to the MMC device 12.

The management software 16 is the MMC device 1
This is a dedicated software for operating and managing the music files recorded on the MMC 38 attached to the No. 2 unit. M
Although the data recorded in the MC 38 and the data managed by the management software 16 are not limited to music files, the management software 16 is software that specializes in music files in this embodiment.

Memory 1 storing management software 16
4 is connected to the CPU 20. Memory 1 for CPU 20
4, a CD-ROM driver 22, a USB driver 2
6 and the sound source board 30 are connected. A speaker 32 is connected to the sound source board 30. CD-ROM
A CD-ROM 24 is attached to the driver 22.

USB I / M provided in the MMC device 12
F32 is connected to the microcomputer 34. Also, the microcomputer 3
4 is connected to the MMC 38 via the MMC I / F 36.

The MMC 38 is a memory 42 for recording data.
And a controller 40 that manages the input and output of data to and from the memory 42. Controller 40 is MMC I /
A memory access command is received from the microcomputer 34 via F36, and data operation according to the command is performed on the memory 42.

The management software 16 of this embodiment is M
The music file recorded in the CD-ROM 24 is copied and written in the memory 42 of the MC 38, the music file recorded in the memory 42 is deleted, and the music file recorded in the memory is read and reproduced. You can perform file operations such as Tari. Further, this management software 16 is the same as the general management software.
38 has a function of creating a database of files stored in the memory 42. This database can be updated only by the management software 16. The operation of the music file by the management software 16 is executed by the CPU 20.

The microcomputer 34 of the MMC device 12 is an MM
Various commands for data operation are issued to the controller 38 of C38. The commands issued by the microcomputer 34 are classified into 12 types, Class 0 to Class 11, as shown in the table of FIG. Then, the microcomputer 34
By issuing a command belonging to Class 6 to the controller 40, write protection for the memory 42 of the MMC 38 can be set and released. Also, by issuing a command belonging to Class 8 to the controller 40, Erase Protect (Erase Protect) for the memory 42 is issued.
ion) can be set and released. It becomes impossible to write a file in the memory 42 of the MMC 38 in which the write protection is set, and it becomes impossible to delete the recorded file in the memory 42 in which the erase protection is set.

The management software 16 of this embodiment uses P
When a file writing operation or a file deleting operation is performed by the user of C10, three commands are issued to the microcomputer 34 as shown in FIG. That is, it is a "protect cancellation command", a "file write / delete command" and a "protect setting command". The instruction of the management software 16 to the microcomputer 34 is called “instruction”,
Command indicating the instruction to the controller 40 of No. 4
To distinguish. However, it is the CPU 20 that operates according to the program of the management software 16 that actually issues the "command" to the microcomputer 34. When a file write operation is performed, the management software 16 issues a "Write protect cancel command" as a "protect cancel command" in addition to the "file write command".
A "Write protect setting command" is issued as a "protect setting command". When a file deletion operation is performed, an "Erase protection setting command" is issued as a "protection cancellation command" in addition to a "file deletion command", and an "Erase protection setting command" is issued as a "protection setting command". .

When the microcomputer 34 receives the "protect cancellation command", the "file write / delete command" and the "protect setting command" issued by the management software 16, the microcomputer 34 analyzes each command and sends it to the controller 40 of the MMC 42. "Unprotect command", "File write / delete command" and "Protect setting command"
To issue. That is, the microcomputer 34 issues a "Write protect cancel command" belonging to Class 6 to the "Write protect cancel instruction" and a "Write protect set command" also belonging to Class 6 to the "Write protect setting command". . Issuing a "file write command" that belongs to Class3 or Class4 in response to a "file write command", and then a "file delete command"
Issue a "file delete command" belonging to Class5. For the "file read command"
Issue a "file read command" that belongs to Class1 or Class2. Then, the "Erase protect cancel command" that belongs to Class 8 is issued to the "Erase protect cancel command", and the "Erase protect set command" that also belongs to Class 8 is issued to the "Erase protect set command".

The controller 40 receives these commands issued by the microcomputer 34 via the MMC I / F 36, and performs operations such as "cancel protection", "write / delete file" and "protect setting" on the memory 42. To do.

File operations on the memory 42 of the MMC 38 can also be performed by an application such as Explore 18 (see FIG. 1). When an operation such as writing or deleting a music file is performed on the Explore 18, the Explore 18 sends only a "file write command" or a "file delete command" to the microcomputer 34 as shown in FIG. Issue. Then, the microcomputer 34 analyzes the “file write command” or the “file delete command” and issues a “file write command” or a “file delete command” to the controller 40. Controller 40 is MMC I
A file write command or a file delete command is received via / F36 and an attempt is made to write or delete a file in the memory 42. However, if the memory 42 of the MMC 38 is write-protected or erase-protected, the "file write command" and the "file delete command" are rejected, and the file cannot be written or deleted.

Accordingly, the management software 16 always writes the memory 42 of the MMC 38 to the memory 42 except when writing or deleting a file by the management software 16.
With the e-protection and Erase protection set, the application such as Explore 18 cannot write or delete the file in the memory 42 of the MMC 38. By doing this, Explore18
The contents of the memory 42 of the MMC 38 are changed by an application other than the management software 16 such as the database and the memory 42 managed by the management software 16.
Prevent the occurrence of discrepancy with the contents of. Also, memory 4
By limiting the file operations such as writing and deleting to 2 to the operations by the management software 16, the risk of deleting the music file or the license file recorded in the memory 42 by an erroneous operation can be reduced.

The operation of the CPU 20 that executes the program of the management software 16 and the program of the Explorer 18 will be described below with reference to FIGS. 5 and 6. When the user activates or activates the management software 16 on Windows (product name) and operates the management software 16, the CPU 20 causes the management software 16 to operate.
It operates according to the program. Also Exp on Windows
Start or activate lorer18 and explorer1
8 is operated, the CPU 20 operates according to the program of the Explorer 18.

For example, the user may enter the management software 16
When an operation for reproducing a music file recorded in the memory 42 of the MMC 38 is performed using the
Determines in step S1 that it is an operation by the management software 16, and then in step S3 that it is an access request to the memory 42. Then, in step S5, it is determined whether the read operation is performed. Since it is a music file playback operation, step S
It is determined to be YES in 5. Then, in step S7, the CPU 20 issues a "file read command" to the microcomputer 34. The “file read command” issued by the CPU 20 is analyzed by the microcomputer 34,
The microcomputer 34 issues a "file read command" to the controller 40. The “file read command” is executed by the controller 40, and the music file designated by the “file read command” is M
It is read from the memory 42 of the MC 38. The music file read by the controller 40 is the MMC I
/ F36, microcomputer 34, USB I / F32 and U
It is transferred to the PC 10 via the SB cable 44.

The music file transferred to the PC 10 is US
CPU from USB driver 26 via B I / F 28
Given to 20. The music file is given from the CPU 20 to the sound source board 30, and is subjected to predetermined sound processing by the sound source board to be converted into music data. Then, the music data is given from the sound source board 30 to the speaker 32,
Music is output from the speaker 32.

The user selects CD-on the management software 16.
The music files recorded in the ROM 24 are MMC38.
When the operation of copying to the memory 42 of the
Determines in step S1 that it is an operation by the management software 16, and then in step S3 that it is an access request to the memory 42. Then, in step S5, it is determined whether the read operation is performed. Since it is a music file copy operation, that is, a music file write operation, NO is determined. next,
In step S9, it is determined whether it is a write operation. Since it is a music file copy operation, step S
It is determined to be YES in 9.

When it is determined in step S9 that the write operation has been performed, the CPU 20 issues a "write protect cancellation command" to the microcomputer 34 in step S11 in order to cancel the write protection set in the memory 42. The “Write protect cancel command” issued by the CPU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues a “Write protect cancel command” to the controller 40. Then, the “write protect release command” is executed by the controller 40,
The controller 40 releases the write protection of the memory 42.

When the write protection of the memory 42 is released, the CPU 20 causes the microcomputer 3 to operate in step S13.
Issue a "file write command" for No. 4. CP
The "file write command" issued by U20 is analyzed by the microcomputer 34, and the microcomputer 34 controls the controller 4
Issue a "file write command" for 0.

Next, the CPU 20 executes the "file transfer instruction" of the program of the management software 16 in step S15. The CPU 20 reads the file specified by the “file transfer command” from the CD-ROM 24 and transfers it to the MMC device 12. The files transferred to the MMC device 12 are USB I / F3
2, provided to the controller 40 via the microcomputer 34 and the MMC I / F 36. The controller 40 writes the given file in the memory 42 as a music file corresponding to the “file write command”.

When the writing of the music file is completed, C
The PU 20 writes the Writ to the memory 42 in step S17.
In order to set e-protection, "W
rite protect setting command "is issued. The “Write protect setting command” issued by the CPU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues a “Write protect setting command” to the controller 40. Then, the “write protect setting command” is executed by the controller 40, and the controller 40 sets the write protect in the memory 42.

When the write protect setting is completed, C
The PU 20 exists as a part of the management software 16 in the memory 14 of the PC 10 in step S19.
Update the MMC38 database. That is, the information of the music file written in the memory 42 of the MMC 38 is added to the database. Then, the process returns to step S1.

When the user operates the management software 16 to delete the music file recorded in the memory 42 of the MMC 38, the CPU 20 determines in step S1 that the operation is performed by the management software 16.
Next, in step S3, it is determined that the access request is for the memory 42. Then, in step S5, it is determined whether the read operation is performed. Since the operation is to delete the music file, it is determined to be NO. Next, step S
At 9, it is judged whether or not it is a write operation. Since this is a file deletion operation, it is determined to be NO here and the process proceeds to step S21.

In step S21, the CPU 20 issues an "erase protection release command" to the microcomputer 34 in order to release the erase protection set in the memory 42.
To issue. The “Erase protection cancellation command” issued by the CPU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues an “Erase protection cancellation command” to the controller 40. Then, the “Erase protect command” is executed by the controller 40, and the controller 40 releases the Erase protect of the memory 42.

When the Erase protection is released, the CPU
Next, in step S23, the 20 issues to the microcomputer 34 a "file delete command" for deleting the specified music file from the memory 42 of the MMC 38. The “file delete command” issued by the CPU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues a “file delete command” to the controller 40. Then, the “file delete command” is executed by the controller 40, and the controller 40 deletes the designated music file from the memory 42.

When the music file is deleted from the memory 42, the CPU 20 at step S25
An "Erase protection setting command" is issued to the microcomputer 34 in order to set the Erase protection. CPU
"Erase protection setting command" issued by 20
Is analyzed by the microcomputer 34, and the microcomputer 34 issues an "Erase protection setting command" to the controller 40. Then, the “Erase protect setting command” is executed by the controller 40, and the controller 40 sets the Erase protect in the memory 42.

When the Erase protection is set, the CPU
20 is the memory 14 of the PC 10 in step S19.
MM, which exists as part of the management software 16 in
Update the C38 database. That is, the data of the music file deleted from the memory 42 of the MMC 38 is deleted from the database. Then, the process returns to step S1.

On the other hand, the user reads the music file recorded in the memory 42 of the MMC 38 by using, for example, the Explorer 18 and reads out an FDD (floppy disk driv) not shown.
When the operation of copying to the FD (floppy disk) attached to e) is performed, first, the CPU 20 does not perform the operation by the management software 16 in step S1 but the Explorer 18
It is determined that the operation is performed by
7, it is determined that the access request is for the memory 42. Then, in step S29, it is determined whether the read operation is performed. Since it is a music file reading operation, YES is determined in step S29. Then, in step S31, the CPU 20 issues a "file read command" to the microcomputer 34. C
The “file read command” issued by the PU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues a “file read command” to the controller 40. "File read command" is the controller 40
The music file designated by the “file read command” is read from the memory 42 of the MMC 38. The music file read by the controller 40 is the MMC I / F 36, the microcomputer 34,
It is transferred to the PC 10 via the USB I / F 32 and the USB cable 44.

The music file transferred to the PC 10 is US
CPU from USB driver 26 via B I / F 28
Given to 20. The music file given to the CPU 20 is transferred to the FDD and recorded in the FD.

The user selects CD-ROM2 on Explorer 18
When the operation of copying the music file recorded in No. 4 to the memory 42 of the MMC 38 is performed, the CPU 20 determines in step S1 that the operation is performed by the Explorer 18 instead of the operation by the management software 16, and then the operation illustrated in FIG.
In step S27, it is determined that the access request is for the memory 42. Then, in step S29, it is determined whether the read operation is performed. Since it is a music file copy operation, that is, a music file write operation, NO is determined. Next, in step S33, it is determined whether it is a write operation. Since it is a music file copy operation, YES is determined in step S33.

When it is determined in step S33 that the write operation is performed, the CPU 20 issues a "file write command" to the microcomputer 34 in step S35. The “file write command” issued by the CPU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues a “file write command” to the controller 40.

Next, the CPU 20 executes the "file transfer instruction" of the program of the Explorer 18 in step S37. The CPU 20 reads the file specified by the “file transfer command” from the CD-ROM 24 and transfers it to the MMC device 12. The file transferred to the MMC device 12 is given to the controller 40 via the USB I / F 32, the microcomputer 34, and the MMC I / F 36. The controller 40 tries to write the given file to the memory 42 as a music file corresponding to the “file write command”. However, since write protection is set in the memory 42, the music file cannot be written in the memory 42.

In addition, the user uses MMC3 on Explorer18.
8 deletes the music file recorded in the memory 42, the CPU 20 determines in step S1 that the operation is performed by the Explorer 18, not the operation by the management software 16, and then the memory is determined in step S27 of FIG. It is determined that the access request is for 42. Then, in step S29, it is determined whether the read operation is performed. Since the operation is to delete the music file, it is determined to be NO. Next, in step S33, it is determined whether or not it is a writing operation. Since this is a file deletion operation, it is determined to be NO here, and the process proceeds to step S39.

In step S39, the CPU 20 causes the MM
A "file delete command" for deleting the specified music file from the memory 42 of C38 is issued to the microcomputer 34. The “file delete command” issued by the CPU 20 is analyzed by the microcomputer 34, and the microcomputer 34 issues a “file delete command” to the controller 40. Then, the controller 40 executes the “file delete command” to store the music file in the memory 42.
Try to remove from. However, in the memory 42, Erase
Music files cannot be deleted because they are protected.

As described above, according to the management software 16 of this embodiment, the Write protect or Erase protect set in the memory 42 of the MMC 38 is temporarily released only when writing or deleting a music file. Then, after writing or deleting, write protection or erase protection is set again. By doing so, except when the management software 16 is used to write to or delete from the memory 42 of the MMC 38, the write to the memory 42 is always performed.
Make sure that Protect and Erase Protect are set.

Therefore, file operations such as writing and deleting of music files to the protected MMC 38 can be performed without bothering the user, and Expl other than the management software 16 can be performed.
It is possible to prevent a music file or a license file from being deleted by an erroneous operation in an application such as orer 18 or a device. Further, since writing and deleting of music files to and from the memory 42 is limited to writing and deleting using the management software 16, the contents of the database included in the management software 16 and the contents of the music files recorded in the memory 42 are different. It is possible to prevent the occurrence of discrepancy.

In the above-mentioned embodiment, the file operation target such as writing and deleting is explained as the music file, but all files recorded in the memory 42 of the MMC 38 are the operation target, and the file such as the license file. Even when writing or deleting, the protection setting and cancellation processing is performed.

Further, in the above embodiment, the management software 16 is assumed to be software that operates on Windows. However, the management software 16 uses other OS (op
erating system). [Second Embodiment] Referring to FIG. 7, a microcomputer 56 as a memory access device of this embodiment is used as a control device of an MMC player 50 for reproducing a music file or the like. The microcomputer 56 includes a display 58, an operation panel 60, a memory 62, and an antenna 5 via a communication circuit 54.
2 are connected. The MMC 38 is detachably attached to the MMC player 50, and the attached MMC 38 is the MMC.
It is connected to the microcomputer 56 via the I / F 64. Also,
The microcomputer 56 has a DSP (digital signal processor).
72 is connected, DSP 72 is D / A 74 and AMP
It is connected to the output terminal 78 via 76. Output terminal 78
Headphone 80 is connected to the headphone 80 by a jack (not shown) of the headphone 80. Further, a USB I / F 82 is connected to the microcomputer 56. Therefore, data can be exchanged between the MMC player 50 and the PC 84 by connecting the MMC player 50 to the PC 84 using the USB cable.

The MMC player 50 not only reproduces the music file recorded in the memory 42 of the MMC 38, but also receives the music file using the antenna 52 and the communication circuit 54 and records the received music file in the memory 42. can do. Further, the music file recorded in the memory 42 can be deleted by operating the menu displayed on the display 58 from the operation panel 60. Further, the music file recorded in the memory 42 is read from the PC 84, and the memory 42 in which the write protection and the erase protection are not set
Can write and delete music files. In this case, PC84 is Explorer
Applications such as are used.

When the user operates the operation panel 60 provided in the MMC player 50 to write a music file (receive a music file) or delete a music file in the memory 42, an operation signal is sent to the microcomputer 56. Given. Then, the microcomputer 56 issues three commands to the controller 40 of the MMC 38, that is, a "protect cancellation command", a "file write / delete command" and a "protect setting command" as shown in FIG.

When a music file write operation is performed, the microcomputer 56 determines that the "Write protect cancel command" belonging to Class 6 is the "Protect cancel command".
Is issued, and Cl is also input as the "protect setting command".
Issue the "Write protect setting command" that belongs to ass6. When a music file is deleted, an "Erase protect release command" belonging to Class 8 is issued as a "protect release command", and an "Erase protect release command" belonging to Class 8 is also issued as a "protect setting command".
rase protection setting command ”is issued.

When the microcomputer 56 issues the "protect release command", "file write / delete command" and "protect setting command", the controller 4
0 receives each command via the MMC I / F 64, and performs each operation of “protection cancellation”, “file writing / deletion” and “protection setting” on the memory 42.

On the other hand, when the user operates the PC 84 to write a music file in the memory 42 or delete a music file, as shown in FIG.
A "file write / delete command" is given from the microcomputer 56. Then, the microcomputer 56 analyzes the “file write / delete command” and issues only the “file write / delete command” to the controller 40.

The operation of the microcomputer 56 will be described below with reference to FIGS. 10 and 11. For example, when the user performs a music file reproduction operation on the operation panel 60 provided in the MMC player 50, first, in step S51, the microcomputer 56 operates the operation panel 60 provided in the main body of the MMC player 50. Or it is an operation from the PC 84 other than the operation panel 60. Since the operation is from the operation panel 60, YES is determined. Next, the microcomputer 56 determines in step S531 whether the access request is for the memory 42. Since it is a music file reproducing operation, it is determined to be YES. Then, in step S55, it is determined whether or not it is a music file reading operation. Since this is a music file reproducing operation, YES is determined in step S55, and the microcomputer 56 issues a "file read command" to the controller 40 in step S57. The “file read command” is executed by the controller 40, and the “file read command” is executed.
The music file specified by is read from the memory 42 of the MMC 38. The read music file is M
It is given to the microcomputer 56 via the MC I / F 64.
Then, the music file is given from the microcomputer 56 to the DSP 72, and subjected to predetermined sound processing by the DSP 72 to become music data. Music data from the DSP72 D /
Given to A74. The music data converted into the analog audio signal by the D / A 74 is given to the AMP 76,
It is amplified by the AMP 76 and output to the output terminal 78. The music data output to the output terminal 78 is further given to the headphones 80 and output from a speaker (not shown) of the headphones 80.

When the user performs a music file receiving operation on the operation panel 60, the microcomputer 56 performs a music file receiving process to receive the music file and generates a write request for the received music file. Then, the microcomputer 56 determines in step S51 that the operation is performed from the operation panel 60 of the main body, and proceeds to step S53. In step S53, it is determined that the request is for accessing the memory 42, and in step S55, it is determined whether the request is for reading a music file. Since it is a music file write request, it is determined to be NO, and it is determined in step S59 whether it is a music file write. In step S59, YES is determined, and in step S6
Go to 1.

In step S61, the microcomputer 56 issues a "Write protect cancel command" to the controller 40 in order to cancel the write protect set in the memory 42. Controller 40 is MMC I
The command is received via / F64 and the "write protect cancellation command" is executed to cancel the write protection of the memory 42.

When the write protection is released, the microcomputer 56 issues a "file write command" to the controller 40 in step S63.

Next, the microcomputer 56 transfers the received music file to the controller 40 via the MMC I / F 64. The controller 40 writes the transferred music file in the memory 42 as a music file corresponding to the “file write command”.

When the writing of the music file to the memory 42 is completed, the microcomputer 56 proceeds to step S67.
In order to set the write protect in the memory 42, “Write
"Protect setting command" is issued to the controller 40. The controller 40 receives the command via the MMC I / F 64 and executes the “Write protect setting command” to set the write protect in the memory 42. Then, the process returns to step S51.

In addition, the user can operate the MMC from the operation panel 60.
When the operation of deleting the music file recorded in the memory 42 of 38 is performed, the microcomputer 56 determines in step S51 that the operation is performed from the operation panel 60 of the main body. Then, in step S53, it is determined that the access request is to the memory 42. Furthermore, step S55
At, it is determined whether the operation is a file read operation. Since it is a file deletion operation, NO is determined, and it is determined in step S59 whether a file writing operation is performed. Since this is a file deleting operation, it is determined to be NO here, and the process proceeds to step S69.

In step S69, the microcomputer 56 issues an "Erase protection release command" to the controller 40 in order to release the Erase protection set in the memory 42.
Issue to. Controller 40 is MMC I / F
The command is received via 64, the “Erase protection release command” is executed, and it is set in the memory 42.
Erase Remove protection.

When the Erase protection set in the memory 42 is released, the microcomputer 56 issues a "file delete command" for deleting the specified music file to the controller 40 in step S71. And the controller 40 is the MMC I / F 64
Command is received and the "file delete command" is executed to delete the specified music file from the memory 42.

When the deletion of the music file is completed, the microcomputer 56 erases the data in the memory 42 in step S73.
An "Erase protection setting command" is issued to the controller 40 to set e protection. The controller 40 receives the command via the MMC I / F 64 and executes the "Erase protection setting command" to set the Erase protection in the memory 42. Then, the process returns to step S51.

On the other hand, the user uses the PC 84 to store the memory 4
When the operation of reading the music file from 2 is performed, a “file read command” is transmitted from the PC 84, and the USB I
It is given to the microcomputer 56 via / F82. Then,
The microcomputer 56 determines in step S51 that the operation is not performed from the operation panel 60 of the main body. And FIG.
In step S75, it is determined that the request is an access request to the memory 42. Further, in step S77, it is determined whether or not it is a music file reading operation. In step S77, YES is determined, and in step S79, a "file read command" is issued to the controller 40. The “file read command” is executed by the controller 40, and the music file specified by the “file read command” is read from the memory 42 of the MMC 38. The read music file is given to the microcomputer 56 via the MMC I / F 64. Furthermore, the microcomputer 56
Is given to the USB I / F 82 from the computer and transmitted to the PC 84 via the USB cable.

When the user uses the PC 84 to write a music file in the memory 42, a “file write command” is sent from the PC 84 together with the music file and given to the microcomputer 56 via the USB I / F 82. Then, the microcomputer 56 determines in step S51 that the operation is not performed from the operation panel 60 of the main body.
Then, in step S75 of FIG.
It is determined to be a request for access to. Since it is the writing of the music file, it is determined to be NO in step S77,
It is determined to be YES in step S81 for determining whether or not a music file is written.

The microcomputer 56 issues a "file write command" to the controller 40 in step S83. Then, in step S85,
The music file transmitted from the PC 84 as the music file corresponding to the “file write command” is transferred to the controller 40.

The controller 40 stores the transferred music file in the memory 4 according to the "file write command".
However, since the memory 42 is write-protected, the music file cannot be written.

Further, the user uses the CP 84 to store the memory 4
When the operation to delete the music file stored in 2 is performed, the “file delete command” is sent from the PC and the USB
It is given to the microcomputer 56 via the I / F 82. Then, the microcomputer 56 determines in step S51 that the operation is not performed from the operation panel 60 of the main body. Then, in step S75 of FIG. 11, it is determined that the access request is to the memory 42. Since it is the deletion of the music file, NO is determined in the step S77, and the step S81 is performed.
Is also determined to be NO.

The microcomputer 56 issues a "file delete command" to the controller 40 in step S87. The controller 40 tries to delete the music file from the memory 42 according to the “file delete command”, but the music file cannot be deleted because Erase protection is set in the memory 42.

As described above, according to the microcomputer 56 of this embodiment, it is set in the memory 42 only when the operation panel 60 provided in the MMC player 50 is operated to write or delete a music file. Writ
Cancel the e-protection or Erase protection once.
Then, after the music file is written or deleted, the write protect or the erase protect is set again in the memory 42. In this way, the microcomputer 56
The write protection and the erase protection are always set in the memory 42 except when the music file is written in or deleted from the memory 42 of the MMC 38 using the MMC player 50 equipped with.

Therefore, the user can perform file operations such as writing and deleting of music files to the MMC 38 to which the protection is set, without being aware of the setting and cancellation of the write protection and Erase protection, and the MMC player. It is possible to prevent a music file or a license file from being deleted by an erroneous operation in a device or application other than 50.

In the above embodiment, the file operation target such as writing and deleting is explained as the music file, but all files recorded in the memory 42 of the MMC 38 are the operation target, and the file such as the license file. Even when writing or deleting, the protection setting and cancellation processing is performed. [Third Embodiment] A memory access device according to this embodiment is a microcomputer 5 mounted on the MMC player 50 shown in FIG.
6, and the microcomputer 56 performs almost the same operation as in the second embodiment. The difference from the second embodiment is that the write protect or the erase protect is released and the write protect or the erase protect is set only when the music file is written to or deleted from the memory 42 of the specific MMC 38.

Each of the MMCs 38 has a CID (card i
128-bit card identification information called dentification) is stored in the memory 42 in a readable manner. By using this CID, MMC38
Can be identified one by one.

The microcomputer 56 of this MMC player 50
Reads the CID from the memory 42 of the MMC 38,
It can be recorded in the memory 62 of the MMC player 50. As shown in FIG. 12, when the music file writing operation or the music file deleting operation is performed from the operation panel 60, the microcomputer 56 causes the controller 40 to perform an M operation.
The "CID inquiry command" requesting the CID of the MC 38 is issued to acquire the CID. And the acquired C
It is determined whether the ID is registered in the memory 62.

When the CID is not registered in the memory 62, the microcomputer 56 issues only a "file write / delete command" to the controller 40. In this case, if write protection is set in the memory 42 of the MMC 38, the “file write command” is rejected by the controller 40, and if erase protection is set, the “file delete command” is rejected by the controller 40.

When the CID is registered in the memory 62, the microcomputer 56 sends a "protect cancel command",
A "file write / delete command" and a "protect setting command" are issued to the controller 40.

The operation of the microcomputer 56 will be described below with reference to FIGS. 13 to 15. From the operation panel 60
When the CID registration operation of the MC 38 is performed, an operation signal is transmitted to the microcomputer 56. Then, the microcomputer 56 determines in step S101 whether it is a CID registration operation. In step S101, YES is determined, and in step S131 of FIG. 14, the "CID request command" is issued to the controller 40. Controller 40
Receives a command via the MMC I / F 64, reads the CID from the memory 42, and transfers the CID to the microcomputer 56 via the MMC I / F 64. And the microcomputer 56
Acquires the CID in step S133, and records the acquired CID in the memory 62 in step S135.

When the user performs a music file reproducing operation on the operation panel 60, C is displayed in step S101.
It is determined whether it is an ID registration operation. Since this is a music file reproducing operation, NO is determined in step S101, and it is determined in step S103 whether the request is an access to the memory 42. In step S103, YES is determined, and in step S105, it is determined whether the file read request is issued. In step S105, YES is determined. Then, in step S107, the designated music file is stored in the memory 4
A "file read command" for reading from the controller 2 is issued to the controller 40. Controller 40
Receives commands via MMC I / F 64,
The "file read command" is executed to read the specified music file from the memory 42. The read music file is output from the speaker of the headphone 80 as described in the second embodiment.

When the user operates the operation panel 60 to receive a music file, the microcomputer 56 issues a music file write request. Then, the microcomputer 56 determines in step S101 whether it is a CID registration operation. Since this is a music file write operation, NO is determined in step S101, and it is determined in step S103 whether the request is an access request to the memory. In step S103, YES is determined. Then, in step S105, it is determined whether the file is read. YE in step S105
It is determined to be S, and the process proceeds to step S109.

In step S109, the controller 40
Issue a "CID request command". The controller 40 receives the command via the MMC I / F 64, executes the “CID request command”, and reads the CID from the memory 42. Then, the CID is transferred to the microcomputer 56 via the MMC I / F 64. The microcomputer 56 acquires the CID in step S111. And
In step S113, the memory 62 of the MMC player 50
To determine whether the CID acquired from the memory 42 is registered in the memory 62.

If NO in step S113, that is, if it is determined that the CID is registered in the memory 62, it is determined in step S137 of FIG. 15 whether a music file is to be written. Y in step S137
The ES is determined, and the process proceeds to step S139. Step S1
At 39, a “file write command” is issued to the controller 40. Then, in step S141, the music file designated for writing is MMC.
Transfer to the controller 40 via the I / F 64. Then, the controller 40 writes the transferred music file in the memory 42 as a file corresponding to the “file write command”. Then, the process returns to step S101.

On the other hand, in step S113, YE
When it is determined that S, that is, the CID is registered in the memory 62, it is determined in step S115 whether or not the music file is written. In step S115, YES is determined. Then, in step S117, the "Write protect cancel command" is issued as described in the second embodiment, and then, in step S119, the "file write command" is issued. Then, in step S121, the music file designated for writing is transferred to the controller 40. Then, when the writing of the music file to the memory 42 is completed, the "Write protect setting command" is issued in step S123. Then, the process returns to step S101.

When the user performs a music file deletion operation on the operation panel 60, the microcomputer 56 determines in step S101 whether the operation is a CID registration operation. Since it is a music file deletion operation, it is judged as NO,
In step S103, it is determined whether the request is an access request to the memory 42. YE in step S103
Judge as S. Then, in step S105, it is determined whether the file is read. In step S105, NO is determined, and the process proceeds to step S109.

In step S109, the "CID request command" is issued to the controller 40 as described above. The controller 40 receives the command via the MMC I / F 64, executes the “CID request command”, and reads the CID from the memory 42. And MMC
The CID is transferred to the microcomputer 56 via the I / F 64.
The microcomputer 56 acquires the CID in step S111. Then, in step S113, it is determined whether or not the CID acquired from the memory 42 is registered in the memory 62.

If NO in step S113, that is, if it is determined that the acquired CID is not registered in the memory 62, it is determined in step S137 of FIG. 15 whether or not a music file is written. Since the music file is deleted, NO is determined in step S137.
Then, in step S143, the controller 40
"File deletion command" is issued to. The controller 40 receives the command via the MMCI / F 64 and executes the “file delete command” to delete the specified music file from the memory 42. And
It returns to step S101.

On the other hand, in step S113, YE
If it is determined that S, that is, the acquired CID is registered in the memory 62, it is determined in step S115 whether the file is written. Since the file is deleted, NO is determined and the process proceeds to step S125. In step S125, as described in the second embodiment, "Erase
The "protect cancellation command" is issued, and then the "file deletion command" is issued in step S127. Then, in step S129, the "Erase protection setting command" is issued, and the process returns to step S101.

As described above, according to the microcomputer 56 of this embodiment, the CI unique to the memory 42 of the MMC 38 is used.
It is possible to record D in the memory 62. And
Memory 4 of MMC 38 in which CID is recorded in memory 62
Only when writing or deleting a file to or from 2, write protect or erase the memory 42.
Release protection and Write protect or Erase
Set the protect setting.

Therefore, the user can perform a file operation such as writing or deleting a music file on the MMC 38 with the protection set, without being aware of the setting or cancellation of the write protection and the erase protection. In addition, all MMC38 memory 42
Instead of setting Write Protect and Erase Protect for a specific M,
Write protection and Erase protection can be set only for the memory 42 of the MC 38, and the flexibility of the protect setting for the memory 42 of the MMC player 50 is expanded.

[Brief description of drawings]

FIG. 1 is an illustrative view showing an overall configuration of a first embodiment of the present invention.

FIG. 2 is a table showing command classes of MMC.

FIG. 3 is an illustrative view showing one example of a file operation procedure in the first embodiment.

FIG. 4 is an illustrative view showing one example of a file operation procedure in the first embodiment.

FIG. 5 is a flowchart showing a part of an example of the operation in the first embodiment.

FIG. 6 is a flowchart showing a part of an example of the operation in the first embodiment.

FIG. 7 is an illustrative view showing an overall configuration of a second embodiment and a third embodiment of the present invention.

FIG. 8 is an illustrative view showing one example of a file operation procedure in the second example.

FIG. 9 is an illustrative view showing one example of a file operation procedure in the second example.

FIG. 10 is a flowchart showing a part of an example of the operation in the second example.

FIG. 11 is a flowchart showing a part of an example of the operation in the second example.

FIG. 12 is an illustrative view showing one example of a file operation procedure in the third embodiment.

FIG. 13 is a flowchart showing a part of an example of the operation in the third embodiment.

FIG. 14 is a flowchart showing a part of an example of the operation in the third embodiment.

FIG. 15 is a flowchart showing a part of an example of the operation in the third example.

[Explanation of symbols]

10 ... PC 12… MMC device 14 ... Memory 16… Management software 38 ... MMC (multi media card) 40 ... Controller 42 ... Memory 56 ... Microcomputer

Claims (10)

[Claims] 1. A memory access program for accessing a protected memory, comprising: (a) inputting an access request; (b) releasing the protection in response to the access request. a memory including: c) performing access according to the access request after the protection is released in step (b); and (d) setting the protection in the memory after the access in step (c) is completed. Access program. 2. A recording medium on which the memory access program according to claim 1 is recorded. 3. A memory access device for accessing a protected memory, input means for inputting an access request, discrimination means for discriminating an input mode of the access request, said discrimination means based on a discrimination result of the discrimination means. Release means for releasing protection, access means for performing access according to the access request after the protection is released by the release means,
And a setting means for setting the protect to the memory after the access by the access means is completed. 4. The discriminating means includes a first discriminating means for discriminating whether the access request is input using a specific program or the access request is input using a general-purpose program, and the releasing means is 4. The memory access device according to claim 3, further comprising first releasing means for releasing the protection when the input is made using a specific program. 5. The discriminating means includes second discriminating means for discriminating whether or not the access request is input by operating a specific key, and the canceling means is inputting the access request by operating the specific key. 4. The memory access device according to claim 3, further comprising second releasing means for releasing the protection. 6. A memory access method for accessing a protected memory, comprising: (a) inputting an access request; (b) determining an input mode of the access request; (c) step (B) releasing the protection according to the determination result in (b), (d) performing an access according to the access request after the protection is released in step (c), and (e) accessing in step (d) A method for accessing a memory, comprising the step of setting the protection in the memory after completion of the above. 7. A memory access device for accessing an attachable / detachable memory that stores an identifier and is protected, wherein the input means inputs an access request, and the protect is released when the identifier is a predetermined identifier. Release means, access means for performing access according to the access request after the protection is released by the release means,
And a setting means for setting the protect to the memory after the access by the access means is completed. 8. A memory access program for storing an identifier and accessing a protected memory, comprising: (a) inputting an access request; (b) said identifier being a predetermined identifier. Step of releasing protection, (c) Step of performing the access according to the access request after the protection is released in step (b), (d) Setting the protection in the memory after the access in step (c) is completed A memory access program including steps. 9. A recording medium on which the memory access program according to claim 8 is recorded. 10. A memory access method for accessing a plurality of memories that store an identifier and are protected, wherein: (a) a step of inputting an access request; (b) the identifier is a predetermined identifier. When the protection is released, (c) the protection is released in step (b), the access is performed according to the access request, and (d) the access is completed in the memory after the access is completed in step (c). A memory access method including a step of setting protection.