JP2014204284A - Information processing device and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress data leakage through a nonvolatile memory when a nonvolatile memory and a volatile memory are used together as a main memory device.SOLUTION: A control unit 50 includes a CPU 51 and a main memory 52. The main memory 52 includes a MRAM module 521 and a DRAM module 522. In the MRAM module 521, a variety of programs executed by the CPU 51 are stored, whereas in the DRAM module 522, there are stored system data including work data generated accompanying the execution of the variety of programs by the CPU 51 and job data including image data. With this, the variety of programs stored in the MRAM module 521 are prevented from erasure, whereas the job data and the system data stored in the DRAM module 522 are automatically erased.

Description

  The present invention relates to an information processing apparatus and a program.

  As a prior art described in the publication, a storage unit configured by a non-volatile memory, an external I / F configured to be detachable from an external storage medium, and logs and image data recording internal information of the apparatus are stored in the storage unit. Determining whether to store in an external storage medium, and not storing the log and image data when storing in the storage unit; and storing the log and image data when storing in the external medium; There is an image forming apparatus provided (see Patent Document 1).

  In addition, as a prior art described in other publications, a volatile memory that is provided in a control device and stores confidential information, and a load built in a building or the like in the vicinity of the control device and a signal line are used to connect a signal. The current detector that continuously sends the current of the theft detection signal to the load via the line and the current flowing through the signal line are monitored, and when it is detected that the current flowing through the signal line has stopped, power is supplied to the volatile memory. There is an information management device including an information erasing unit that erases confidential information stored in a volatile memory by stopping (see Patent Document 2).

JP 2011-104796 A JP 2012-203805 A

  An object of the present invention is to suppress leakage of data through a nonvolatile memory when a nonvolatile memory and a volatile memory are used together as a main storage device.

  The invention described in claim 1 is a non-volatile memory capable of reading and writing and capable of holding stored information without supplying power, and memorizing that data can be read and written and power is not supplied. A volatile memory that cannot hold the stored information, a main storage unit that stores the program in the nonvolatile memory, and the program read from the nonvolatile memory of the main storage unit Control means for controlling the connected equipment, and a storage area for storing transmission data sent to the equipment or reception data sent from the equipment in accordance with the control of the equipment by the control means. And an information processing apparatus including setting means for setting the volatile memory of the main storage means.

A second aspect of the present invention is the information processing apparatus according to the first aspect, wherein the non-volatile memory in the main storage unit stores the uncompressed program.
The invention according to claim 3 is characterized in that the setting means sets the storage area to the nonvolatile memory when the volatile memory is removed from the main storage means. The information processing apparatus described.

  The invention described in claim 4 is a non-volatile memory that is readable and writable and can store stored information without supplying power, and that it can be read and written and does not supply power. A volatile memory that cannot hold the stored information, a main storage unit that stores the program in the nonvolatile memory, and the program read from the nonvolatile memory of the main storage unit An information processing apparatus including: an execution unit configured to perform storage; and a setting unit configured to set, in the volatile memory of the main storage unit, a storage area for storing work data generated when the execution unit executes the program. is there.

A fifth aspect of the present invention is the information processing apparatus according to the fourth aspect, wherein the non-volatile memory in the main storage unit stores the uncompressed program.
The invention according to claim 6 is characterized in that the setting means sets the storage area in the nonvolatile memory when the volatile memory is removed from the main storage means. The information processing apparatus described.

  The invention described in claim 7 is a non-volatile memory that can read and write and can store stored information without supplying power, and can store and read information that can be read and written without power. Main storage means having a volatile memory that cannot hold information, execution means for executing processing based on data read from the main storage means, and first data in the data as the main memory A setting unit configured to store the second data having higher confidentiality than the first data in the nonvolatile memory of the main storage unit and store the second data in the volatile memory of the main storage unit. Information processing apparatus.

  The invention according to claim 8 is a non-volatile memory that can read and write information to a computer and can store stored information without supplying power, and can read and write without being supplied with power. A volatile memory incapable of holding stored information, and reading and executing the program from the nonvolatile memory of the main storage means in which the program is stored in the nonvolatile memory And a function for controlling the connected device, and a storage area for storing transmission data to be transmitted to the device or reception data transmitted from the device in accordance with the control of the device. It is a program that realizes the function set in the volatile memory.

  The invention according to claim 9 is a non-volatile memory that can read and write to a computer and can store stored information without supplying power, and can read and write without being supplied with power. A function of reading and executing the program from the nonvolatile memory of the main storage means in which the program is stored in the nonvolatile memory. And a function for setting, in the volatile memory of the main storage means, a storage area for storing work data generated along with the execution of the program.

  The invention described in claim 10 is a non-volatile memory that can read and write information to a computer and can store stored information without supplying power, and can read and write data without supplying power. A function of executing processing based on data read from main storage means having a volatile memory incapable of holding stored information, and the first data in the data to the main storage means A program for realizing the function of storing in the nonvolatile memory and setting the second data having higher confidentiality than the first data to be stored in the volatile memory.

According to the first aspect of the present invention, when a non-volatile memory and a volatile memory are used in combination as a main storage device, data leakage through the non-volatile memory is reduced as compared with the case where the present configuration is not provided. Can be suppressed.
According to the second aspect of the present invention, the time required for the startup process can be shortened compared to the case where the present configuration is not provided.
According to the third aspect of the present invention, it is possible to cope with a change in the configuration of the main storage device as compared with the case where this configuration is not provided.
According to the fourth aspect of the present invention, when a non-volatile memory and a volatile memory are used in combination as the main storage device, data leakage through the non-volatile memory is reduced as compared with the case where this configuration is not provided. Can be suppressed.
According to the fifth aspect of the present invention, the time required for the activation process can be shortened compared to the case where the present configuration is not provided.
According to the sixth aspect of the present invention, it is possible to cope with a change in the configuration of the main storage device as compared with the case where this configuration is not provided.
According to the seventh aspect of the present invention, when a non-volatile memory and a volatile memory are used in combination as the main storage device, data leakage through the non-volatile memory is reduced as compared with the case where this configuration is not provided. Can be suppressed.
According to the eighth aspect of the present invention, when a non-volatile memory and a volatile memory are used in combination as a main storage device, data leakage through the non-volatile memory is reduced as compared with the case where the present configuration is not provided. Can be suppressed.
According to the ninth aspect of the present invention, when a non-volatile memory and a volatile memory are used in combination as the main storage device, data leakage through the non-volatile memory is reduced as compared with the case where this configuration is not provided. Can be suppressed.
According to the tenth aspect of the present invention, when a non-volatile memory and a volatile memory are used in combination as the main storage device, data leakage through the non-volatile memory is reduced as compared with the case where this configuration is not provided. Can be suppressed.

1 is a diagram illustrating an example of a configuration of an image forming system to which the exemplary embodiment is applied. 2 is a hardware block diagram illustrating an example of an internal configuration of a control unit provided in the image forming apparatus. FIG. It is a figure which shows an example of a structure of a memory map when a 1st memory structure is set. It is a figure which shows an example of a structure of a memory map in case the 2nd memory structure is set. 3 is a flowchart for explaining a procedure of start-up processing in the image forming apparatus. It is a flowchart for demonstrating the procedure of the control processing (1st control processing) after starting in case the 1st memory structure is set. It is a flowchart for demonstrating the procedure of the control process (2nd control process) after starting in case the 2nd memory structure is set.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a diagram illustrating an example of a configuration of an image forming system to which the exemplary embodiment is applied.
The image forming system includes an image forming apparatus 1 that operates as a so-called multi-function machine having a scan function, a print function, a copy function, and a facsimile function, a network 2 connected to the image forming apparatus 1, and a network 2. It has a terminal device 3, a facsimile device 4 connected to the network 2, and a server device 5 connected to the network 2.

  Here, the network 2 is configured by an Internet line, a telephone line, or the like. The terminal device 3 instructs the image forming apparatus 1 to form an image via the network 2 and is composed of, for example, a PC (Personal Computer). Further, the facsimile apparatus 4 transmits and receives a facsimile to and from the image forming apparatus 1 via the network 2. Furthermore, the server device 5 transmits / receives data (including a program) to / from the image forming device 1 via the network 2.

  In addition, the image forming apparatus 1 includes an image reading unit 10 that reads an image recorded on a recording medium such as paper, an image forming unit 20 that forms an image on a recording medium (recording material) such as paper, and a power supply from a user. A user interface (UI) 30 that receives instructions related to operations using the on / off, scan function, print function, copy function, and facsimile function, and displays a message to the user, and a terminal device via the network 2 3. A transmission / reception unit 40 that transmits / receives data to / from the facsimile apparatus 4 and the server apparatus 5 and a control unit 50 that controls operations of the image reading unit 10, the image forming unit 20, the UI 30, and the transmission / reception unit 40. ing. In the image forming apparatus 1, the image reading unit 10 realizes a scanning function, the image forming unit 20 realizes a printing function, and the image reading unit 10 and the image forming unit 20 realize a copying function. 10. The facsimile function is realized by the image forming unit 20 and the transmission / reception unit 40. In the following description, a scan operation using a scan function, a print operation using a print function, a copy operation using a copy function, and a facsimile transmission / reception operation using a facsimile function are collectively referred to as a “job”. Note that the transmitter / receiver 40 may be provided separately for the Internet line and the telephone line, for example. In the present embodiment, the image reading unit 10, the image forming unit 20, the UI 30, and the transmission / reception unit 40 provided in the image forming apparatus 1 each have a function as a device.

FIG. 2 is a hardware block diagram illustrating an example of an internal configuration of the control unit 50 provided in the image forming apparatus 1 illustrated in FIG.
The control unit 50 is connected to the CPU (Central Processing Unit) 51 that controls each part of the image forming apparatus 1 by executing various operations, and is connected to the CPU 51 to read and write various data. The CPU 51 and the main memory 52 are mounted on a common circuit board (not shown).

  Here, the CPU 51 includes a CPU core 511 that executes various operations according to a program read from the main memory 52, a memory controller 512 that controls transmission and reception of data between the CPU core 511 and the main memory 52, and these CPUs. A CPU 511, a main memory 52, and a CPU internal bus 513 for connecting other components (not shown) built in the CPU 51 to each other are provided. In this embodiment, the CPU core 511 functions as an example of an execution unit or a control unit, and the memory controller 512 functions as an example of a setting unit.

  Note that the program executed by the CPU 51 is stored in a storage medium such as a CD-ROM, for example, in addition to being stored in the main memory 52 in advance, or provided to the CPU 51 or from the server device 5 via the network 2. It is also possible to provide it to the CPU 51.

  On the other hand, the main memory 52 as an example of main memory means includes an MRAM module 521 having an MRAM (Magnetoresistive Random Access Memory) as a memory device and a DRAM module 522 having a DRAM (Dynamic Random Access Memory) as a memory device. Have. Each of the MRAM module 521 and the DRAM module 522 has a structure conforming to, for example, a DIMM (Dual Inline Memory Module) standard, and is attached to and detached from a circuit board (not shown) provided in the control unit 50. It is possible.

  The MRAM module 521 constituting the main memory 52 has a function as an example of a nonvolatile memory that can be rewritten and can hold stored information without supplying power. Note that the characteristic required for the nonvolatile memory of this embodiment is that data can be read and written at the same speed as that of DRAM. In addition to MRAM, FeRAM (Ferroelectric RAM), PRAM (Phase change RAM), or ReRAM (Resistance RAM) or the like may be used.

  The DRAM module 522 constituting the main memory 52 has a function as an example of a volatile memory that can be rewritten and cannot store stored information unless power is supplied. In addition to the DRAM, an SRAM (Static Random Access Memory) or the like may be used.

  In this embodiment, the MRAM module 521 and the DRAM module 522 constituting the main memory 52 read / write data at a common clock frequency. For this reason, the MRAM module 521 has a read / write performance equivalent to that of the DRAM module 522. In the present embodiment, the storage capacity of the DRAM module 522 is larger than the storage capacity of the MRAM module 521. This is because the unit price per unit capacity of the MRAM module 521 is higher than the unit price per unit capacity of the DRAM module 522. In the present embodiment, the storage capacity of the MRAM module 521 is, for example, 512 MB, and the storage capacity of the DRAM module 522 is, for example, 8 GB.

  The image forming apparatus 1 according to the present embodiment can operate in a state where both the MRAM module 521 and the DRAM module 522 are mounted as the main memory 52 in the control unit 50, and the main memory is stored in the control unit 50. The operation in the state where only the MRAM module 521 is mounted as 52 is also possible. In the control unit 50 of the present embodiment, the MRAM module 521 is a memory that is installed as standard, and the DRAM module 522 is a memory that is installed as an option. In the following description, a state in which both the MRAM module 521 and the DRAM module 522 are mounted as the main memory 52 is referred to as “first memory configuration”, and only the MRAM module 521 is mounted as the main memory 52. This state is called “second memory configuration”.

  FIG. 3 is a diagram showing an example of the configuration of the memory map when the above-described first memory configuration is set. When the first memory configuration is set, the CPU 51 reads / writes data from / to the main memory 52 based on the memory map shown in FIG.

  In the memory map shown in FIG. 3, the storage area A0 of the main memory 52 as a whole is basically used as a first storage area A1 used as a ROM (Read Only Memory) and basically as a RAM (Random Access Memory). Second storage area A2. When the first memory configuration is set, that is, when the main memory 52 includes the MRAM module 521 and the DRAM module 522, the first storage area A1 is arranged in the MRAM module 521 and the second memory is stored in the DRAM module 522. Region A2 is arranged.

  Here, the first storage area A1 in the first memory configuration has a reset vector storage area A11, an OS storage area A12, an application storage area A13, and a free area A14.

The reset vector storage area A11 stores an initial program loader (IPL), which is a program that is first executed by the CPU 51 in the control unit 50 when the image forming apparatus 1 is activated.
The OS storage area A12 is a program that is executed by the CPU 51 following the IPL in the control unit 50 when the image forming apparatus 1 is started, and an operating system (Operating System) serving as a base for operating various application programs described later. OS) is stored in an uncompressed state (decompressed state).
The application storage area A13 stores a plurality of application programs corresponding to each configuration and each function that can be implemented in the image forming apparatus 1 in an uncompressed state (expanded state).
The empty area A14 is an area in which data is not stored in the first memory configuration.

  On the other hand, the second storage area A2 in the first memory configuration has a system data storage area A21 and a job data storage area A22.

  The system data storage area A21 has a function as a work area for temporarily storing work data generated when the CPU 51 executes the program. In addition, in the system data storage area A21, in addition to this, the transmission destination (for example, the telephone number of the facsimile apparatus 4) set when performing the facsimile transmission operation and the transmission source (for example, the terminal apparatus 3 of the terminal apparatus 3) are designated. It has a function of temporarily storing data including personal information such as an IP address. In the following description, each of the data stored in the system data storage area A21 is collectively referred to as “system data”. This system data storage area A21 corresponds to "a storage area for storing work data generated in accordance with execution of a program by the execution means".

  The job data storage area A22 stores scan image data acquired when performing a scan operation, a copy operation, and a facsimile transmission operation, print image data acquired when performing a print operation, a copy operation, and a facsimile reception operation, and the like. To do. In the following description, each of the above data generated along with the execution of various jobs is collectively referred to as “job data”. This job data storage area A22 corresponds to “a storage area for storing transmission data sent to a device or reception data sent from the device in accordance with control of the device by the control means”. Therefore, the scanned image data and the print image data correspond to transmission data and reception data.

  FIG. 4 is a diagram illustrating an example of the configuration of the memory map when the above-described second memory configuration is set. When the second memory configuration is set, the CPU 51 reads / writes data from / to the main memory 52 based on the memory map shown in FIG.

  Also in the memory map shown in FIG. 4, the storage area A0 of the main memory 52 as a whole is basically a first storage area A1 used like a ROM (Read Only Memory) and basically a RAM (Random Access Memory). And the second storage area A2 that is used as shown in FIG. When the second memory configuration is set, that is, when the main memory 52 includes only the MRAM module 521, both the first storage area A1 and the second storage area A2 are arranged in the MRAM module 521.

  Here, the first storage area A1 in the second memory configuration has a reset vector storage area A11, an OS storage area A12, and an application storage area A13. The functions of the reset vector storage area A11, the OS storage area A12, and the application storage area A13 are as described in the first memory configuration.

  On the other hand, the second storage area A2 in the second memory configuration has a system data storage area A21 and a job data storage area A22. The functions of the system data storage area A21 and the job data storage area A22 are as described in the first memory configuration.

  In the second memory configuration shown in FIG. 4, the second storage area A2 (system data storage area A21 and system data storage area A21 and the area that was the empty area A14 of the first storage area A1 in the first memory configuration shown in FIG. A job data storage area A22) is arranged.

  Therefore, the first memory configuration and the second memory configuration are common in that the first storage area A1 is arranged in the MRAM module 521. On the other hand, in the first memory configuration, the second storage area A2 is arranged in the DRAM module 522, whereas in the second memory configuration, the second storage area A2 is arranged in the MRAM module 521. Is different.

  Further, in the second memory configuration shown in FIG. 4, the storage capacity of the second storage area A2 is smaller than that in the first memory configuration shown in FIG. This is because the storage capacity of the MRAM module 521 is smaller than the storage capacity of the DRAM module 522.

  Note that the control unit 50 according to the present embodiment stores the above-described OS and application programs in a compressed state, and decompresses (decompresses) the ROM and the ROM used for writing into the main memory 52 when necessary. I do not have. For this reason, the CPU 51 of the present embodiment accesses the main memory 52 from the beginning of startup and executes various programs (IPL, OS, application program) in the startup process described later.

  FIG. 5 is a flowchart for explaining a startup process of the image forming apparatus 1 shown in FIG. This activation process is performed when, for example, a reset instruction is input to the CPU 51 when the power of the image forming apparatus 1 is turned on via the UI 30, or for some reason after the power of the image forming apparatus 1 is turned on. This is executed when a reset instruction is input to the CPU 51.

  When the CPU 51 provided in the control unit 50 receives a reset instruction (step 101), the CPU 51 (more specifically, the CPU core 511) executes its own reset (CPU reset). Here, when the main memory 52 has the first memory configuration, the stored contents of the DRAM module 522 constituting the main memory 52 are erased with the CPU reset, but the MRAM module constituting the main memory 52 is erased. The stored contents of 521 are not erased, and the stored contents before the CPU reset are held as they are. On the other hand, when the main memory 52 has the second memory configuration, the stored contents of the MRAM module 521 constituting the main memory 52 are not erased with the CPU reset, and the stored contents before the CPU reset are maintained as they are. The

  Subsequently, in the CPU 51, the CPU core 511 starts from the reset vector storage area A 11 of the first storage area A 1 arranged in the MRAM module 521 in the main memory 52 via the CPU internal bus 513 and the memory controller 512. The loader (IPL) is read and the read IPL is executed (step 102). As the IPL is executed, the CPU 51 detects whether or not the DRAM module 522 is connected as the main memory 52 (step 103).

  When an affirmative determination (YES) is made in step 103, that is, when the main memory 52 has the first memory configuration (MRAM module 521 and DRAM module 522), the CPU 51 stores the second memory in the DRAM module 522. Area A2 (system data storage area A21 and job data storage area A22) is secured (step 104). On the other hand, when a negative determination (NO) is made in step 103, that is, when the main memory 52 has the second memory configuration (only the MRAM module 521), the CPU 51 stores the second storage area in the MRAM module 521. A2 (system data storage area A21 and job data storage area A22) is secured (step 105).

  In step 104, the second storage area A2 is secured in the DRAM module 522, or after the second storage area A2 is secured in the MRAM module 521 in step 105, the CPU 51 causes the CPU internal bus 513 and the memory controller 512 to be connected. Accordingly, the operating system (OS) is read from the OS storage area A12 of the first storage area A1 arranged in the MRAM module 521 in the main memory 52, and the read OS is executed (step 106). Following execution of the OS in step 106, the CPU 51 sequentially reads and executes a plurality of application programs from the application storage area A13 of the first storage area A1 arranged in the MRAM module 521 in the main memory 52 (step 107). As a result, the image forming apparatus 1 shifts to an operable state, and a series of startup processing is completed.

  Next, the control process of the image forming apparatus 1 after the above-described start process is completed will be described. In the present embodiment, the method of the control process after completion of the startup process is different depending on whether the main memory 52 has the first memory configuration or the second memory configuration. Therefore, hereinafter, a control process when the main memory 52 has the first memory configuration (hereinafter referred to as “first control process”) and a control process when the main memory 52 has the second memory configuration ( Hereinafter, the description will be divided into “second control processing”.

<First control processing>
FIG. 6 is a flowchart for explaining the procedure of the control process after startup (first control process) when the first memory configuration is set.
In the first control process, whether or not the CPU 51 provided in the control unit 50 has received an instruction to execute a job (scan operation, print operation, copy operation, or facsimile transmission / reception operation) via the UI 30 or the transmission / reception unit 40. Is determined (step 201). If an affirmative determination (YES) is made in step 201, the CPU 51 executes a job process corresponding to the instruction by executing an application program related to the corresponding operation (step 202). In step 202, along with the execution of the application program, the system data associated with the execution of the current job process is written into the system data storage area A21 of the second storage area A2 arranged in the DRAM module 522 in the main memory 52. In the main memory 52, job data associated with execution of the current job process is written in the job data storage area A22 of the second storage area A2 arranged in the DRAM module 522. On the other hand, if a negative determination (NO) is made in step 201, the process proceeds to step 203 as it is.

  When job processing is executed in step 202 and when a negative determination (NO) is made in step 201, the CPU 51 next receives an instruction to turn off the power of the image forming apparatus 1 via the UI 30 or the like. Is determined (step 203).

  If a negative determination (NO) is made in step 203, the CPU 51 returns to step 201. On the other hand, if an affirmative determination (YES) is made in step 203, the CPU 51 executes a shutdown process for ending the operation of the image forming apparatus 1 (step 204), and then turns off the power of the image forming apparatus 1. This completes the first control process (step 205).

  As described above, in the first control process executed when the first memory configuration is set, the IPL, the OS, and various application programs (hereinafter collectively referred to as various programs), the MRAM module 521. In addition, the system data and job data generated by executing various application programs are stored in the DRAM module 522. Here, it can be said that the system data and job data as an example of the second data have higher confidentiality than various programs as an example of the first data because the system data and the job data can include personal information and image data.

  When system data and job data are stored in the MRAM module 521, the system data and job data are stored in the MRAM module 521 even after the image forming apparatus 1 is turned off when the shutdown process is completed. There is a concern that it will remain.

  In contrast, in the first control process, when the power of the image forming apparatus 1 is turned off when the shutdown process is completed, the system data and job data stored in the DRAM module 522 are automatically deleted. become. Therefore, even if the MRAM module 521 or the DRAM module 522 is removed from the control unit 50 with the power of the image forming apparatus 1 turned off, both the MRAM module 521 and the DRAM module 522 Data with high confidentiality is not stored. Therefore, it is possible to suppress leakage of highly confidential data due to removal of the MRAM module 521 or the DRAM module 522.

<Second control processing>
FIG. 7 is a flowchart for explaining a procedure of control processing after startup (second control processing) when the second memory configuration is set.
Also in the second control process, the CPU 51 provided in the control unit 50 determines whether or not a job execution instruction has been received via the UI 30 or the transmission / reception unit 40 (step 301). If an affirmative determination (YES) is made in step 301, the CPU 51 executes a job process corresponding to the instruction by executing an application program related to the corresponding operation (step 302). In step 302, along with the execution of the application program, the system data associated with the execution of the current job process is written in the system data storage area A21 of the second storage area A2 arranged in the MRAM module 521 in the main memory 52. In the main memory 52, job data associated with execution of the current job process is written in the job data storage area A22 of the second storage area A2 arranged in the MRAM module 521. When the execution of job processing in step 302 is completed, the CPU 51 erases the job data written in the job data storage area A22 of the second storage area A2 in step 302 (step 303). On the other hand, if a negative determination (NO) is made in step 301, the process proceeds to step 304 as it is.

  If the job data is deleted in step 303 and if a negative determination (NO) is made in step 301, the CPU 51 next receives an instruction to turn off the image forming apparatus 1 via the UI 30 or the like. Is determined (step 304).

  If a negative determination (NO) is made in step 304, the CPU 51 returns to step 301. On the other hand, if an affirmative determination (YES) is made in step 304, the CPU 51 erases the system data written in the system data storage area A21 of the second storage area A2 in step 302 (step 305). Subsequently, the CPU 51 executes a shutdown process for terminating the operation of the image forming apparatus 1 (step 306), and then turns off the power of the image forming apparatus 1 (step 307), whereby the second control process is performed. To complete.

  As described above, in the second control process executed when the second memory configuration is adopted, various programs, system data, and job data are stored in the MRAM module 521. However, the job data is deleted every time the job processing that generated the job data is completed, and the system data is deleted after the power-off instruction and before the shutdown processing is started. Erasing is performed.

  Therefore, even if the MRAM module 521 is removed from the control unit 50 with the power of the image forming apparatus 1 turned off, highly confidential data is not stored in the MRAM module 521. It will be. Therefore, it is possible to suppress leakage of highly confidential data due to the removal of the MRAM module 521.

DESCRIPTION OF SYMBOLS 1 ... Image forming apparatus, 2 ... Network, 3 ... Terminal apparatus, 4 ... Facsimile apparatus, 5 ... Server apparatus, 10 ... Image reading part, 20 ... Image forming part, 30 ... UI, 40 ... Transmission / reception part, 50 ... Control part 51 ... CPU, 52 ... main memory, 511 ... CPU core, 512 ... memory controller, 513 ... CPU internal bus, 521 ... MRAM module, 522 ... DRAM module, A0 ... storage area, A1 ... first storage area, A2 ... Second storage area, A11 ... reset vector storage area, A12 ... OS storage area, A13 ... application storage area, A14 ... free area, A21 ... system data storage area, A22 ... job data storage area

Claims (10)

Non-volatile memory that is readable and writable and can retain stored information without supplying power, and it is impossible to retain stored information that is readable and writable without supplying power A volatile memory capable of storing a program in the nonvolatile memory;
Control means for controlling connected devices by executing the program read from the nonvolatile memory of the main storage means;
Setting means for setting, in the volatile memory of the main storage means, a storage area for storing transmission data to be sent to the equipment or reception data sent from the equipment in accordance with the control of the equipment by the control means And an information processing apparatus.   The information processing apparatus according to claim 1, wherein the non-volatile memory in the main storage unit stores the uncompressed program.   The information processing apparatus according to claim 1, wherein the setting unit sets the storage area in the nonvolatile memory when the volatile memory is removed from the main storage unit. Non-volatile memory that is readable and writable and can retain stored information without supplying power, and it is impossible to retain stored information that is readable and writable without supplying power A volatile memory capable of storing a program in the nonvolatile memory;
Execution means for executing the program read from the nonvolatile memory of the main storage means;
An information processing apparatus comprising: a setting unit that sets a storage area for storing work data generated when the execution unit executes the program in the volatile memory of the main storage unit.   The information processing apparatus according to claim 4, wherein the non-volatile memory in the main storage unit stores the uncompressed program.   The information processing apparatus according to claim 4, wherein the setting unit sets the storage area in the nonvolatile memory when the volatile memory is removed from the main storage unit. Non-volatile memory that is readable and writable and can retain stored information without supplying power, and it is impossible to retain stored information that is readable and writable without supplying power Main storage means having possible volatile memory;
Execution means for executing processing based on data read from the main storage means;
The first data in the data is stored in the nonvolatile memory of the main storage unit, and the second data having higher confidentiality than the first data among the data is stored in the volatile state of the main storage unit. An information processing apparatus including setting means for performing setting so as to be stored in a memory. On the computer,
Non-volatile memory that is readable and writable and can retain stored information without supplying power, and it is impossible to retain stored information that is readable and writable without supplying power A volatile memory capable of controlling the connected device by reading and executing the program from the nonvolatile memory of the main storage means in which the program is stored in the nonvolatile memory. ,
A program for realizing a function of setting, in the volatile memory of the main storage unit, a storage area for storing transmission data to be transmitted to the device in accordance with the control of the device or reception data transmitted from the device . On the computer,
Non-volatile memory that is readable and writable and can retain stored information without supplying power, and it is impossible to retain stored information that is readable and writable without supplying power A function of reading and executing the program from the nonvolatile memory of the main storage means in which the program is stored in the nonvolatile memory;
A program for realizing a function of setting, in the volatile memory of the main storage means, a storage area for storing work data generated along with the execution of the program. On the computer,
Non-volatile memory that is readable and writable and can retain stored information without supplying power, and it is impossible to retain stored information that is readable and writable without supplying power A function of executing processing based on data read from the main storage means having a volatile memory possible;
The main storage means stores first data in the data in the nonvolatile memory, and stores second data having higher confidentiality than the first data in the volatile memory. A program that realizes the function to perform settings.

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