JP2008299545A - Mobile terminal device and access method to external memory thereof - Google Patents

Abstract

A high-speed access from a host device (portable terminal device) to a memory card (external memory) is made possible by making access paths to a security area and a data area via different controllers.
A first path via an external memory controller with encryption 111 between an external memory 107 and a security area driver 113, and an external memory controller that does not support CPRM between an external memory 107 and a data area driver 114. 112 and a second route via 112, the access route is switched according to the access area (security area or data area) in the external memory 107, and data (video or music) from the host device (mobile phone 1) to the memory card is switched. Etc.) to improve the access speed.
[Selection] Figure 5

Description

  The present invention relates to a portable terminal device capable of accessing an external memory having a storage area including a security area and a data area, and an access method for the external memory.

  In recent years, semiconductor memory cards have a small size, light weight, large storage capacity, high read / write speed, and are used in various applications such as digital cameras, portable audio, electronic payment systems, authentication systems, and digital content network distribution systems. It has been. The specifications of the semiconductor memory card include a multimedia card (MMC) (registered trademark), a smart media (SSFDC) (registered trademark), a compact flash (registered trademark), an SD (Secure Digital) memory card (registered trademark), and a memory. There is a stick (registered trademark).

  Many of these semiconductor memory cards are provided with a security function from the viewpoint of copyright protection. For example, a memory card with a security function such as an SD memory card (hereinafter also referred to as an external memory) is now widely used as a medium compatible with CPRM (Content Protection for Recordable Media).

A memory card with a security function is divided into a security area (protection area) and a data area (user area) as its internal storage area. A host device connected to a memory card in which such a storage area is divided into a security area and a data area has a memory card controller with a function such as CPRM (hereinafter referred to as a CPRM compatible memory card ( Need to be accessed via an external memory (referred to as a controller). For this reason, even when accessing the data area, access is made via the memory card controller with CPRM compatible encryption (see, for example, Patent Document 1).
JP 2005-25426 A

  Thus, conventionally, in a memory card (external memory) having a security area and a data area, the same CPRM-compatible memory card controller is used to access each area from the host device (mobile terminal device). It was. However, originally, it is not necessary to use a CPRM-compatible memory card controller to access the data area, and a CPRM-incompatible memory card controller can be used.

  On the other hand, in accessing such a memory card, access to the security area is basically small, and access to the data area is dominant. In such a situation, generally, the access speed to the memory of the CPRM compatible memory card controller is much slower than that of the memory card controller not compatible with CPRM.

  For this reason (conventionally, since the data area is accessed using a CPRM-compatible memory card controller), there is a problem that access to the data area, that is, access to the entire memory card is delayed. .

  The present invention has been made in view of the above problems, and an object of the present invention is to enable high-speed access from a mobile terminal device to an external memory by using separate access paths to a security area and a data area. And

  In order to solve the above problems, a mobile terminal device according to the present invention includes an external memory connection unit to which an external memory having a storage area including a security area and a data area is connected, and the security area of the external memory. A first external memory control unit that can be accessed with encryption processing, a second external memory control unit that can access the data area of the external memory, and the external memory connection unit A communication connection switching unit that switches and connects the external memory to either the first external memory control unit or the second external memory control unit, and the security area of the external memory or the And a connection control unit that controls a connection state of the communication connection switching unit in accordance with an accessed region of the data region.

  Further, in the mobile terminal device, the connection control unit has a data determination unit that determines a type of data accessed to the external memory, and corresponds to the type of the access data determined by the data determination unit. It is preferable to control the connection state of the communication connection switching unit.

  The mobile terminal device includes a driver unit including a security area driver and a data area driver, and the security area driver accesses the external memory via the first external memory control unit, The data area driver may access the external memory via the second external memory control unit.

  Further, the method for accessing the external memory of the mobile terminal device according to the present invention includes a step of reading the decryption key from the security area of the external memory by the first external memory control unit in order to solve the above problem. A step of reading data from the data area of the external memory by the second external memory control unit; and a step of decoding the read data based on the decryption key.

  Further, the method for accessing the external memory of the mobile terminal device according to the present invention includes a step of detecting whether the input data is rights-protected data, and if the data is rights-protected data, A step of recording an encryption key in a security area of the external memory via the first external memory control unit; a step of encoding the right-protected data based on the encryption key; and the encoded right-protected data Is recorded in the data area of the external memory by the second external memory control unit.

  According to the present invention, high-speed access from a mobile terminal device to an external memory is possible.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the following, a mobile phone will be described as a mobile terminal device, but the present invention is not limited to this, and a PHS (Personal Handy Phone System), a PDA (Personal Digital Assistant), a portable navigation device, a notebook personal computer, etc. Other portable terminal devices may be used.

  The basic structure of the mobile phone 1 will be described with reference to FIGS. FIG. 1 shows a front view of the mobile phone 1 in the opened state (first open state). 2A shows a left side view when the mobile phone 1 is opened, and FIG. 2B shows a right side view when the mobile phone 1 is opened. FIG. 3 shows a rear view in a state where the mobile phone 1 is opened.

  The mobile phone 1 includes an operation unit side body 2 and a display unit side body 3. The operation unit side body 2 and the display unit side body 3 are connected to each other via a connection unit 4 having a biaxial hinge mechanism, and the mobile phone 1 can be deformed into an open state and a closed state. In each closed state, the display unit side body 3 can be switched between a front state and a back state.

  Here, the closed state is a state in which both housings are arranged so as to overlap each other, and the open state is a state in which both housings are arranged so as not to overlap each other. In the open state, the display 30 disposed on the surface 3A of the display unit side body 3 to be described later and the operation key group 11 disposed on the front case 2a of the operation unit side body 2 are the same. The back state is a state in which the display 30 in the display unit side body 3 and the operation key group 11 in the operation unit side body 2 are disposed to face opposite sides. Say. Further, the front state in the closed state is a state in which the display 30 in the display unit side body 3 is arranged so as to face the operation key group 11 in the operation unit side body 2, and the back state in the closed state is In this state, the display 30 in the display unit side body 3 is exposed without facing the operation key group 11 in the operation unit side body 2.

  The outer surface of the operation unit side body 2 includes a front case 2a and a rear case 2b. The operation unit side body 2 has an operation key group (also referred to as an input operation unit) 11 and a voice input unit (microphone) to which a voice uttered by a user of the mobile phone 1 is input on the front case 2a side. 12 are exposed to each other. Here, the operation key group 11 includes function setting operation keys (also referred to as function keys) 13 for operating various functions such as various settings, a telephone book function, and a mail function, numbers of telephone numbers, characters such as mail, and the like. Are input operation keys 14 and a determination operation key 15 for determining various operations, scrolling up and down, left and right, and the like. The microphone 12 is disposed on the outer end side opposite to the connecting portion 4 side in the longitudinal direction of the operation unit side body 2. That is, the microphone 12 is disposed on one outer end side when the mobile phone 1 is in the open state.

  Each key constituting the operation key group 11 is predetermined according to a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. Function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  On one side surface of the operation unit side body 2, as shown in FIG. 2A, an interface 16 for transmitting / receiving data to / from an external device (such as a PC), a headphone / microphone terminal 17, A removable external memory interface 18 and a charging terminal 19 for charging the battery are provided. The interface 16, the headphone terminal / microphone terminal 17, and the interface 18 are covered with a dust-proof cap that can be attached and detached when not in use.

  On the other side of the operation unit side body 2, as shown in FIG. 2B, a pair of side keys 20, an operation key 21 used at the time of imaging, and a broadcast wave whose radio wave reception angle can be adjusted. A receiving antenna 22 is arranged. A predetermined function is assigned to the side key 20 in accordance with a deformed state such as an open / close state and a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of the activated application ( Key assignment). Here, similarly to the above, when the side key 20 is pressed by the user, an operation corresponding to the function assigned to the side key 20 in the mobile phone 1 is executed.

  As shown in FIG. 3, a camera unit 23 that captures an image of a subject and a light unit 24 that irradiates the subject with light are disposed in the rear case 2 b of the operation unit side body 2. The camera unit 23 and the light unit 24 are arranged on the connection unit 4 side in the operation unit side body 2. In addition, the rear case 2b in the operation unit side body 2 has an opening for mounting the battery in a battery housing portion, which will be described in detail later, and a battery lid 25 is disposed so as to close the opening. Is done.

  Moreover, the upper end part of the operation part side housing | casing 2 and the lower end part of the display part side housing | casing 3 are connected via the connection part 4 provided with a biaxial hinge mechanism, as shown in FIGS. As shown in FIG. 3, the sub operation key group 33 is arranged in a line in the width direction (short direction) of the mobile phone 1 on one surface (back surface) of the connecting portion 4. Each of the keys constituting the sub operation key group 33 depends on a deformed state such as an open / closed state or a front / back state of the operation unit side body 2 and the display unit side body 3 and the type of application being activated. A predetermined function is assigned (key assignment). In the mobile phone 1, when each key constituting the operation key group 11 is pressed by the user, an operation corresponding to the function assigned to each key is executed.

  Further, the display unit side body 3 is configured by a front case 3a and a rear case 3b on the outer surface. As shown in FIG. 1, a display 30 having a predetermined shape for displaying various information and a sound output unit 31 for outputting sound on the other party side of the call are exposed on the front case 3 a in the display unit side body 3. To be arranged. Here, the audio output unit 31 is disposed on the outer end side opposite to the connection unit 4 in the longitudinal direction of the display unit side body 3. That is, the audio output unit 31 is arranged on the other end side when the mobile phone 1 is in the open state.

  Further, as shown in FIG. 3, a sub-display 32 for displaying various types of information is disposed in the rear case 3 b of the display unit side body 3 so as to be exposed. Each of the display 30 and the sub-display 32 includes a liquid crystal panel, a drive circuit that drives the liquid crystal panel, and a light source unit such as a backlight that emits light from the back side of the liquid crystal panel.

  In the present embodiment, the cellular phone 1 that can be folded by the connecting portion 4 is described. However, the cellular phone 1 is not foldable, and the operation unit side body 2 and the display unit side body 3 are overlapped. One of the casings is slid in one direction, or one of the casings is rotated about an axis along the direction in which the operation unit side casing 2 and the display unit side casing 3 overlap. A rotating type (turn type), or a type (straight type) in which the operation unit side body 2 and the display unit side body 3 are arranged in one housing and does not have a connecting portion may be used.

  Next, each function of the mobile phone 1 will be described with reference to the functional block diagram of FIG. As shown in FIG. 4, the mobile phone 1 includes a first communication unit (first communication means) 100 capable of communicating with a wireless LAN communication network that is a communication network compliant with the first communication standard, A second communication unit (second communication unit) 200 capable of communicating with a mobile communication network that is a communication network compliant with a communication standard, a processing unit 201 that performs predetermined processing, and a CPU 202 are provided. The battery 90 supplies power to the first communication unit 100, the second communication unit 200, and the processing unit 201. The CPU 202 (including a function as display control means for changing and controlling the display content of the display 30 in accordance with the operation of the input control unit 11) includes a first communication unit (also referred to as a wireless unit) 100 and a second Predetermined control is performed on the communication unit (also referred to as a wireless unit) 200 and the processing unit 201.

  The first communication unit 100 communicates by telephone or mail with another communication terminal device via a base station based on a predetermined communication method (compliant with a wireless LAN, for example, IEEE 802.11). And an antenna unit 81 that downloads a Web page having a predetermined URL from the Internet, and a communication processing unit 101 including a transmission circuit and a reception circuit (not shown).

  In addition, the second communication unit 200 communicates with other communication terminal devices via a base station based on a predetermined communication method (mobile communication network, for example, CDMA (Code Division Multiple Access) 2000_1x or the like). Communication processing composed of an antenna unit 80 (main antenna) that performs communication by telephone or mail, download of a Web page having a predetermined URL from the Internet, and a transmission circuit and a reception circuit (not shown) Unit 203.

  In addition, the processing unit 201 stores at least two operation data groups (input operation unit) 11, a microphone 12, a display (display unit) 30 such as an LCD or an OLED, an audio output unit 31, and predetermined data. A memory 204 having a ROM for storing an operation program of the CPU 202, a sound processing unit 205 that performs predetermined sound processing, and predetermined image processing An image processing unit 206, a camera unit 23 that captures an object, a speaker 207 that outputs a ringtone, an earphone jack 104 for connection to an earphone (headphone), and an external memory controller that accesses the external memory 107 An access switching unit 105 (to be described later) for switching, an external memory connection unit 106 for connecting to the external memory 107, etc. Eteiru. The operation key group (input operation unit) 11, the microphone 12, the display (display unit) 30, the audio output unit 31, the memory 204, the sound processing unit 205, the image processing unit 206, the camera unit 23, the speaker 207, and the earphone jack 104. And the access switching unit 105 are connected by a bus line 102, and the access switching unit 105, the external memory connection unit 106, and the external memory 107 are connected by a signal line 103, respectively.

  Next, a configuration for speeding up data access of the external memory 107 by the cellular phone 1 as a host device will be described with reference to FIG. FIG. 5 is a block diagram showing the relationship between the host device and the external memory 107, and is a diagram showing in detail the block (external memory high-speed access unit) 108 surrounded by the dashed line in FIG.

  The external memory high-speed access unit 108 in FIG. 5 includes an access switching unit (a host device for convenience) 105 and an external memory connection unit 106 to which the external memory 107 is connected to connect the external memory 107 and the access switching unit 105. Composed. The external memory connection unit is constituted by, for example, an SD memory card connector.

  The external memory 107 includes a security area (protection area) 109 and a data area (user area) 110 therein. The access switching unit 105 includes a communication connection switching unit 115, a CPRM compatible external memory controller 111, a CPRM non-compatible external memory controller 112, a security area driver 113 and a data area driver that are file systems (also referred to as driver units). 114. The access switching unit 105 is controlled by the CPU 202.

  The CPRM compatible external memory controller 111 as the first external memory control unit accesses the security area of the external memory 107 with encryption processing. It also decodes and encodes data protected by copyright and the like. The CPRM non-compatible external memory controller 112 which is the second external memory control unit accesses the data area of the external memory 107 without encryption processing.

  The communication connection switching unit 115 connects the CPRM compatible external memory controller 111 and the external memory connection unit 106 (security area of the external memory 107), or the CPRM non-compatible external memory controller 112 and the external memory connection unit 106 (external memory 107). Data area). Note that this connection control is performed by the CPU 202 which is a connection control unit having data discrimination means for discriminating the data type of whether or not the handled data is data protected by copyright or the like.

  The security area driver 113 accesses the security area 109 of the external memory 107 via the CPRM compatible external memory controller 111 and the communication connection switching unit 115, and the data area driver 114 communicates with the CPRM non-compatible external memory controller 112. The data area 110 of the external memory 107 is accessed via the switching unit 115.

  Next, the operation of the external memory high-speed access unit 108 will be described with reference to FIGS. FIG. 6 is a flowchart showing a procedure for reading data from the external memory, and FIG. 7 is a flowchart showing a procedure for writing data to the external memory.

[Reading data from external memory]
Data from the external memory 107 is used to display an image on the display 30 using the data stored in the external memory 107 or to output sound such as music from the speaker 207 via the sound processing unit 205. When a read request occurs, the CPU 202 first assumes that the matching (authentication) of the external memory 107 is obtained based on the attribute of the external memory 107 such as a memory card connected to the external memory connection unit 106. The communication connection switching unit 115 is switched to the CPRM-compatible external memory controller 111 side, and the encryption related to encryption processing such as a decryption key is performed from the security area 109 of the external memory 107 via the external memory connection unit 106 and the communication connection switching unit 115. The converted data is read (step S1), and the process proceeds to step S2.

  In step S2, the CPU 202 controls the CPRM compatible external memory controller 111 to decrypt encrypted data such as decryption key data read from the security area 109 and encrypted (encoded). The process proceeds to step S3.

  In step S3, the CPU 202 switches the communication connection switching unit 115 to the CPRM non-compatible external memory controller 112 side, and from the data area of the external memory 107, the external memory connection unit 106, the communication connection switching unit 115, and CPRM non-compatible. The data is read out via the external memory controller 112 and the data area driver 114, written in the first buffer memory of the memory 204, and the process proceeds to step S4.

  In step S4, the CPU 202 determines whether or not the decryption of the encrypted data from the security area 109 is completed in the CPRM compatible external memory controller 111. If it is determined that the decoding has not been completed, the process proceeds to step S4. If it is determined that the decoding has been completed, the process proceeds to step S5.

  In step S5, the CPU 202 determines in the CPRM compatible external memory controller 111 whether or not the decryption of the encrypted data is appropriate. If the decryption is not appropriate, the process is terminated. If the decryption is appropriate, the process proceeds to step S6.

  In step S6, the CPU 202 controls the CPRM compatible external memory controller 111 to read the data written in the first buffer memory of the memory 204 by the security area driver 113 and decrypt the encrypted data. Based on the encrypted data (decryption key data here), the read data is decoded and written into the second buffer memory of the memory 204 via the security area driver 113, and the process proceeds to step S7.

  In step S7, the CPU 202 reads data from the second buffer memory of the memory 204, and outputs it to the output means (for example, the speaker 207, the earphone jack 104, etc.) via the sound processing unit 205.

  Thus, an external memory controller (CPRM-compatible external memory controller 111) that reads encrypted data (decryption key data) from the security area 109 of the external memory 107 and an external memory that reads data output from the data area 110 of the external memory 107 Since it is configured differently from the controller (non-CPRM compatible external memory controller 112), when reading data stored in the data area 110 of the external memory 107, the CPRM compatible external memory having a low access speed to the memory Data can be read without using a controller, and high speed access to an external memory is possible.

  Further, according to the above configuration, the access path to the external memory 107 includes an access path with encryption processing (path including the CPRM compatible external memory controller 111) and an access path without encryption processing (CPRM non-compatible external memory controller 112). Therefore, the decoding process of the data written in the first buffer memory of the memory 204 and the reading of the data from the data area 110 of the external memory 107 are performed. It is possible to process simultaneously, and it is possible to increase the access speed and the decoding process.

[Write data to external memory]
When a request to write the acquired data to the external memory 107 is generated by downloading from the DVD, CD, or the Internet in step S11, the CPU 202 first stores the input data in the second buffer memory of the memory 204. The writing and processing are moved to step S11.

  In step S11, the CPU 202, which is a data determination unit, determines whether or not the data written in the second buffer memory of the memory 204 is data that is copyright-protected. If it is determined that the data is not right-protected data, the process proceeds to step S15, the communication connection switching unit 115 is switched to the CPRM non-compliant external memory controller 112 side, and is written in the second buffer memory of the memory 204. The read data is read, and the data is written into the data area of the external memory 107 via the data area driver 114, the CPRM non-compliant external memory controller 112, the communication connection switching section 115, and the external memory connection section 106. On the other hand, if it is determined that the data is rights-protected, the process proceeds to step S12.

  In step S12, the CPU 202 switches the communication connection switching unit 115 to the CPRM-compatible external memory controller 111 side, and the CPRM-compatible external memory controller 111 from the second buffer memory of the memory 204 via the security area driver 113. Data is read out, the CPRM compatible external memory controller 111 is controlled, an encryption key (encryption key) or the like is generated using a random number or the like, and the external memory 107 is connected via the communication connection switching unit 115 and the external memory connection unit 106. An encryption key or the like is recorded in the security area 109, and the process proceeds to step S13.

  In step S13, the CPU 202 controls the CPRM compatible external memory controller 111, encodes the data read from the second buffer memory of the memory 204 in accordance with the generated encryption key, and generates a security area driver. The data is written into the first buffer memory of the memory 204 via 113, and the process proceeds to step S14.

  In step S14, the CPU 202 switches the communication connection switching unit 115 to the CPRM non-compatible external memory controller 112 side, and the data written in the first buffer memory of the memory 204 is transferred to the data area driver 114, CPRM non- The data is read out via the corresponding external memory controller 112, the communication connection switching unit 115, and the external memory connection unit 106 and recorded in the data area of the external memory 107.

  As described above, the present invention has the following effects.

  The first path between the memory card (external memory) 107 and the security area driver 113 via the CPRM compatible memory card (external memory) controller 111, and the memory card (external memory) 107 and the data area driver 114 A second path via the CPRM non-compliant memory card (external memory) controller 112 is provided between them, and the access path is switched according to the access area (security area or data area) inside the memory card (external memory) 107. Therefore, the access speed of data (moving images, music, etc.) from the host device (mobile phone 1) to the memory card can be improved.

  In addition, since the access speed to the memory card (external memory) 107 is increased, it is possible to reduce the stress on the user of the reading speed in storing image data of the camera and playing back video / music from the memory card. .

  As mentioned above, although the Example was described, this invention is not limited to this.

  That is, in the embodiment, it is described that the security area and the data area exist in advance in the memory card (external memory). However, the present invention is not limited to this, and the file system includes the security area and the data area. Each region may be created virtually (logically).

  Further, although the memory card is used as an external memory, the present invention is not limited to this, and an internal memory may be used. Further, a storage medium such as a hard disk may be used instead of the memory.

The front view in the state (1st open state) which opened the mobile telephone is shown. (A) The left view in the state which opened the mobile phone is shown, (B) The right view in the state which opened the mobile phone is shown. The rear view in the state which opened the mobile telephone is shown. It is a block diagram which shows the function of the mobile telephone which concerns on this invention. 3 is a block diagram showing a relationship between a host device and an external memory 107. FIG. It is the flowchart which showed the procedure of the reading process of the data from an external memory. It is the flowchart which showed the procedure of the writing process of the data to an external memory.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile telephone 2 Operation part side housing | casing 2a, 3a Front case 2b, 3b Rear case 3 Display part side housing | casing 4 Connection part 11 Operation key group 12 Microphone 23 Camera part 30 Display 31 Audio | voice output part 80, 81 Antenna 100 1st Communication unit 101, 203 communication processing unit 102 bus 103 signal line 104 earphone jack 105 access switching unit 106 external memory connection unit 107 external memory (memory card)
108 External memory high speed access unit 109 Security area 110 Data area 111 CPRM compatible external memory controller 112 CPRM non-compatible external memory controller 113 Security area driver 114 Data area driver 115 Communication connection switching section 200 Second communication section 201 Processing section 202 CPU (connection control unit)
204 Memory 205 Sound processing unit 206 Image processing unit 207 Speaker (reproduction data output unit)

Claims (5)

An external memory connection unit to which an external memory having a storage area including a security area and a data area is connected;
A first external memory control unit capable of accessing the security area of the external memory with encryption processing;
A second external memory control unit capable of accessing the data area of the external memory;
A communication connection switching unit that switches and connects the first external memory control unit or the second external memory control unit to the external memory connected to the external memory connection unit in a communicable manner;
A portable terminal device comprising: a connection control unit that controls a connection state of the communication connection switching unit in accordance with an accessed area of the security area or the data area of the external memory. The connection control unit includes a data determining unit that determines a type of data accessed to the external memory, and the communication connection switching unit includes a data determining unit that determines a type of data to be accessed by the data determining unit. The mobile terminal device according to claim 1, wherein the connection state is controlled. It has a driver part with a security area driver and a data area driver,
The security area driver accesses the external memory via the first external memory control unit,
The mobile terminal device according to claim 1, wherein the data area driver accesses the external memory via the second external memory control unit. Reading the decryption key from the security area of the external memory in the first external memory control unit;
Reading out data from the data area of the external memory by the second external memory control unit;
Decoding the read data based on the decryption key;
A method for accessing an external memory of a mobile terminal device. Detecting whether the input data is rights-protected data;
If it is rights-protected data, recording the encryption key in the security area of the external memory via the first external memory control unit;
Encoding rights-protected data based on the encryption key;
Recording the encoded right-protected data in the data area of the external memory in the second external memory control unit;
A method for accessing an external memory of a mobile terminal device.

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